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# Sports Court & School Line Marking Melbourne: Dimensions, Surfaces & Multi-Sport Layouts

## Sports Court & School Line Marking Melbourne: Dimensions, Surfaces & Multi-Sport Layouts

Melbourne's schools and sporting facilities face a challenge that's uniquely their own: how do you fit a regulation basketball court, a netball court, and a tennis layout — each governed by different international bodies — onto the same asphalt slab, without creating a visual labyrinth that confuses students and makes every sport unplayable?

This isn't hypothetical. It's the daily reality for Melbourne primary and secondary school principals, PE coordinators, and facility managers. The answer comes down to precise dimensional planning, intelligent colour-coded overlay design, and choosing the right material for surfaces that need to survive Melbourne's UV-intense summers and wet winters.

This guide provides the specification-level information needed to plan, brief, and commission a sports court or school playground line marking project in Melbourne — whether you're starting from bare concrete or refreshing faded lines on a 20-year-old asphalt surface.

---

## Why Official Dimensions Are Non-Negotiable, Even for School Courts

There's a common misconception that school sports courts can be marked to approximate dimensions. In practice, every governing body — Basketball Australia (via FIBA), Netball Australia, and Tennis Australia (via ITF) — publishes specific court dimensions that directly affect gameplay, player safety, and insurance coverage.

Marking a basketball court with an incorrectly placed three-point arc doesn't just create an unfair game; it means students train with spatial references that won't correspond to the courts they'll compete on. More critically, undersized run-off zones create genuine injury risk, and facilities that deviate from published standards may face liability exposure if an injury occurs.

For Melbourne schools, there's an additional practical driver: Department of Education facility planning guidelines align with these governing body standards, which means grant-funded court upgrades typically require compliance documentation.

---

## Official Court Dimensions: Sport-by-Sport Reference

### Basketball Court Dimensions

In Australia, the National Basketball League (NBL) uses FIBA regulations and rules, including total court size and court line markings such as the free throw and three-point lines. This makes FIBA the de facto standard for all Australian basketball courts, from elite facilities down to school playgrounds.

A FIBA-regulation-sized basketball court is a flat, hard surface free from obstructions, 28 m long × 15 m wide. The space around the court requires a minimum of 2 m free from obstruction, and all lines are 50 mm wide and uniform in colour, generally white.

Key internal markings under FIBA rules:

- The FIBA regulation three-point arc is 6.75 m away from the basket.

- Under FIBA standards, the free-throw line sits 5.80 metres from the inner edge of the endline and runs parallel to it. The line itself is 3.60 metres long.

- The centre line divides the court into two equal halves, while the centre circle marks the jump-ball area. On a FIBA court, the centre circle radius is 1.80 metres.

For schools with constrained footprints, half-court basketball courts measuring approximately 20 metres by 20 metres are popular, particularly in council areas. However, half-court layouts should still respect FIBA internal marking proportions to support proper skill development.

### Netball Court Dimensions

Netball court dimensions are: Length 30.50 m, Width 15.25 m, Court Thirds 10.167 m, Goal Circle Radius 4.9 m, Centre Circle 900 mm, and all line widths 50 mm.

The standard playing court measures 30.5 m × 15.25 m, but once you include the recommended 3.05 m run-off zone on all sides, the total area required comes to approximately 36.6 m long by 21.35 m wide.

This run-off requirement isn't optional. The court measurements and run-offs outlined form part of the current Official Rules of Netball as provided by the International Netball Federation (INF), which Netball Australia is a member of. Netball Australia and State/Territory Member Organisations follow the facility specifications outlined in the Official Rules of Netball.

Unlike sports such as basketball and football, netball umpires officiate outside the court boundaries. To ensure the umpires can safely run around the outside of the court as well as providing a run-off space for players, courts must have these clear run-off zones around the court perimeter.

For outdoor courts, outdoor courts typically have a 1% gradient for water drainage, while indoor courts are flat. This drainage gradient is critical for Melbourne's wet winters and must be factored into surface preparation before line marking.

### Tennis Court Dimensions

The dimensions of a tennis court are defined and regulated by the International Tennis Federation (ITF) governing body and are written down in the annual 'Rules of Tennis' document.

The court is 23.77 m long. Its width is 8.23 m for singles matches and 10.97 m for doubles matches. The service line is 6.40 m from the net.

On most occasions, tennis courts are built to the correct dimensions for doubles matches with line markings to indicate the playing area for singles matches. The recommended minimum size for an international standard doubles tennis court is 23.77 × 10.97 metres.

For junior programs in Melbourne schools, the ITF's modified court sizes are increasingly relevant. The ITF has mandated that official competition for children aged 10 years and under should be played on "Orange" courts 18 m long by 6.4 m wide. Competition for children under 8 years is played on "Red" courts that are 11 m long and 5.5 m wide.

### Quick-Reference Dimensions Table

| Sport | Playing Area | Line Width | Key Run-Off |
|---|---|---|---|
| Basketball (FIBA) | 28 m × 15 m | 50 mm | 2 m minimum |
| Netball (INF/Netball Australia) | 30.5 m × 15.25 m | 50 mm | 3.05 m all sides |
| Tennis — Doubles (ITF) | 23.77 m × 10.97 m | 50 mm baseline; 25–50 mm other lines | 6.4 m behind baseline |
| Tennis — Singles (ITF) | 23.77 m × 8.23 m | as above | as above |

---

## Surfaces: Asphalt vs. Concrete for Melbourne Schools

The two dominant surfaces for outdoor sports courts in Melbourne schools are asphalt (bitumen) and concrete. Each has distinct characteristics that affect both the line marking approach and the long-term durability of the markings.

### Asphalt (Bitumen) Courts

Asphalt is the more common surface in older Melbourne primary schools, particularly those built between the 1960s and 1990s. It's relatively forgiving to install but presents specific challenges for line marking:

- **UV degradation**: Melbourne's UV index regularly exceeds 11 in summer ([Bureau of Meteorology data](http://www.bom.gov.au/uv/)), and asphalt surfaces absorb and retain heat, accelerating paint degradation. Waterborne acrylic sports paint on asphalt in high-sun exposure areas may require repainting every 2–3 years.
- **Surface oxidation**: Older asphalt becomes oxidised and porous, reducing paint adhesion. Surface preparation — including cleaning, crack filling, and a primer coat — is essential before applying any marking system.
- **Flexibility**: Asphalt expands and contracts with temperature. Rigid materials like two-pack epoxy can delaminate on asphalt; waterborne acrylic and thermoplastic are better suited.

Asphalt pavements may have a cheaper capital cost; however, they can have a shorter predicted lifespan and higher ongoing maintenance cost than concrete pavements.

### Concrete Courts

Concrete is the preferred substrate for new school court construction in Melbourne because of its dimensional stability, longer surface life, and better adhesion for premium marking materials. Concrete courts accept thermoplastic, two-pack epoxy, and acrylic systems equally well, provided the surface is clean, dry, and free of curing compounds.

Because of the varying surface types typically found in playgrounds and other recreational areas, the options for marking must be considered based on the surface. Concrete and asphalt surfaces may require a different approach than rubberised surfaces. The age of the surface will also determine how well it will accept markings. Older surfaces may require more preparation and different materials to create markings that adhere properly.

---

## Thermoplastic Line Marking for Schools: Why It Dominates

For Melbourne schools, thermoplastic has become the material of choice for both sports court lines and playground game designs. The reasons are practical and economic.

Playground markings made from thermoplastic material can generally be applied to most hard horizontal surfaces such as asphalt, bitumen and concrete.

The surface is primed, and thermoplastic markings are applied using a propane lance, bonding them securely to the surface. This method assures longevity, as these premium, non-toxic materials last 8–10 times longer than traditional paint.

Playground designs are extremely durable, made from a modern non-toxic and non-slip thermoplastic which has a 5-year manufacturer warranty. A 5 to 7-year lifespan for thermoplastic playground markings is commonly promoted.

The anti-slip property of thermoplastic is particularly significant for school environments. Thermoplastic playground markings are a popular choice because of their anti-slip functionality and durability to last years of use. As they often encourage children to be more active in these areas, they enhance safety.

Beyond sports courts, thermoplastic enables the full range of playground game designs that Melbourne schools increasingly invest in: in addition to sports courts, playgrounds can incorporate educational markings that considerably enhance the learning experience for children. These markings, made from durable thermoplastic materials, support literacy, numeracy, and science through designs like number grids, phonics pathways, and educational mazes. Customisable in various colours and shapes, educational markings allow schools to align designs with their curriculum goals.

### Thermoplastic vs. Waterborne Acrylic: School Court Comparison

| Factor | Thermoplastic | Waterborne Acrylic |
|---|---|---|
| Lifespan (outdoor) | 5–10 years | 2–4 years |
| Anti-slip | Built-in aggregate | Requires additive |
| Application method | Heat-applied (propane lance) | Spray or roller |
| Suitable surfaces | Asphalt, concrete | Asphalt, concrete |
| Cost (upfront) | Higher | Lower |
| Cost (lifecycle) | Lower | Higher (frequent repainting) |
| Custom shapes/logos | Excellent (waterjet cut) | Limited |

Preformed thermoplastic lines and symbols are heat-applied to the surface and provide exceptional durability — up to 6–8 years on outdoor courts. They're more expensive upfront but offer excellent long-term value for high-use facilities.

---

## Multi-Sport Overlay Design: Eliminating Visual Confusion

The most technically demanding aspect of school sports court line marking is the multi-sport overlay — applying two or more complete court layouts on a single surface so that each sport remains visually clear and playable.

### The Colour-Coding Principle

Multi-Use Games Areas (MUGAs) are commonly marked with multiple colour-coded layouts, allowing different sports to be played on the same surface without confusion. Markings can also be added for training zones, warm-up areas, and recreational play.

The industry-standard colour allocation in Australian schools is:

- **Basketball**: White (most frequently played sport gets the primary colour)
- **Netball**: Red
- **Tennis**: Yellow
- **Volleyball**: Blue

The line marking is done in different colours and is usually a standard colour — tennis white, basketball yellow, netball red, volleyball blue — the only thing you need to worry about is the posts, and these will need to be removable.

As a rule of thumb, the most frequently used sport is marked out in white, the second most played sport in yellow and black, followed by green, blue, and red.

### How Many Sports Can Coexist on One Surface?

Multi Courts overlay more than one sports court on the one area using contrasting colours to maximise limited playground space for children's activity. Multi Courts are a clever way for schools to engage children in a variety of games in limited spaces. A maximum of three courts in any one playground area is recommended.

This three-sport maximum isn't arbitrary. Some combinations create too many overlapping lines and become confusing. A primary school in Preston wanted five sports on one court, and the recommendation was to limit to three to maintain a workable visual environment.

### Dimensional Compatibility: Basketball and Netball

Basketball and netball work well together because both run lengthwise and share similar overall dimensions — basketball 28 m × 15 m, netball 30.5 m × 15.25 m.

Full regulation basketball (28 m × 15 m) plus full regulation netball (30.5 m × 15.25 m) need a minimum 32 m × 17 m when oriented the same direction to accommodate both with slight overlaps.

Tennis presents a different challenge because its orientation is typically perpendicular to basketball and netball. Tennis fits perpendicular to basketball on large enough surfaces. This means a school planning a three-sport overlay of basketball, netball, and tennis needs to carefully map the available space before committing to a layout — a task that should be completed by the line marking contractor as part of the quoting process, not after the job is awarded.

### Colour Sequencing: Which Lines Go Down First?

The order in which colours are applied affects the visual hierarchy of the finished court. For shared courts (basketball, netball, tennis, volleyball), a colour-coded overlay system allows multiple sports to co-exist on one surface. Each sport is assigned a specific colour, and the lines are applied in a planned sequence to maintain clarity. This requires careful planning to avoid visual clutter.

The practical rule: the sport with the most visually complex markings (typically basketball, with its arc and key geometry) should be applied first, followed by simpler layouts. Lines for sports where in/out calls are critical — such as tennis — should be applied last and in the most visually distinct colour available.

---

## Scheduling Considerations for Melbourne Schools

School line marking projects carry operational constraints that are distinct from car park or warehouse jobs. Key considerations include:

**Term break scheduling**: Line marking on active school grounds almost always requires school holiday access. Melbourne's four-term school year creates predictable windows — January, April, July, and September/October — that fill quickly with contractors. Schools should obtain quotes and schedule work at least 6–8 weeks in advance of the preferred term break.

**Working with Children requirements**: All staff working on school sites must be Working with Children cardholders; the safety of children interacting with workers must be assured. Melbourne schools should confirm this requirement with any contractor before engagement.

**Surface drying and cure time**: Depending on the application and material used, the playground will be usable from anywhere between 30 minutes and 1–2 days after application. The team will work with you to use a material that is most appropriate for your project and inform you of any drying times when the playground may need to be closed off. Thermoplastic, once cooled (typically 15–30 minutes), is walk-ready faster than most acrylic systems — a meaningful advantage when access windows are tight.

**Surface wetness**: Markings can't be applied to wet surfaces, so timing the application is also important, especially as many playgrounds are outdoors. Melbourne's spring and autumn weather — with unpredictable afternoon showers — means contractors should build weather contingencies into school project schedules.

---

## Playground Game Designs Beyond Sports Courts

A complete school line marking project typically extends beyond regulation sports courts to include playground game designs that activate passive areas of the school grounds. Common thermoplastic designs used in Melbourne schools include:

- **Four square / handball courts**: High-use, low-space designs that fit into corner areas
- **Hopscotch**: Classic single-file game suitable for primary-age students
- **Number grids and multiplication tables**: Curriculum-linked designs that extend learning outdoors
- **Compass roses and world maps**: Geography-integrated designs for upper primary
- **Target circles and fitness circuits**: Physical education support markings

Playground markings help schools achieve their goals of improving meaningful recess and break time play. Thermoplastic line marking for schools is a great addition to playgrounds, sports courts, footpaths, open spaces and more.

The key design principle for playground game layouts is spatial separation: the playground should be an extension of the classroom — orderly, well laid out, colourful and most importantly making correct use of the space available so that the children aren't on top of each other whilst at play. All the individual markings should have their own sufficient space to allow the children room to learn and play.

---

## Key Takeaways

- **FIBA basketball courts** require 28 m × 15 m with a minimum 2 m run-off; **Netball Australia courts** require 30.5 m × 15.25 m with a mandatory 3.05 m run-off on all sides; **ITF tennis courts** are 23.77 m long, 10.97 m wide for doubles. These dimensions are non-negotiable for compliance and player safety.
- **Thermoplastic is the preferred material** for Melbourne school sports courts and playground markings, offering 5–10 year lifespans, built-in anti-slip properties, and compatibility with both asphalt and concrete — outperforming waterborne acrylic by a factor of 3–5× in lifespan.
- **Multi-sport overlays should be limited to three sports per surface** to prevent visual confusion; the standard Australian colour convention is basketball (white), netball (red), tennis (yellow), and volleyball (blue).
- **Basketball and netball are the most compatible overlay pairing** because of near-identical widths and the same lengthwise orientation; a combined footprint of at least 32 m × 17 m is required for full-regulation versions of both.
- **School scheduling requires lead time**: Melbourne's term break windows are the primary access opportunity for line marking contractors; schools should book 6–8 weeks in advance, confirm Working with Children compliance, and factor in surface drying time before reopening playgrounds.

---

## Conclusion

Sports court and school line marking in Melbourne sits at the intersection of governing body compliance, surface science, and spatial planning. Getting it right — from FIBA basketball dimensions to thermoplastic playground game designs — creates school environments that are safer, more engaging, and operationally durable for years without repainting.

The multi-sport overlay challenge is where professional expertise adds the most value. A contractor who can plan a basketball/netball/tennis combination on a constrained asphalt slab, apply colour-coded thermoplastic in the correct sequence, and deliver a court that students can intuitively navigate from day one is providing a fundamentally different service from one who simply repaints faded white lines.

For Melbourne schools and facility managers, this guide should work as the briefing document for your next project — and the benchmark against which contractor proposals should be evaluated.

**Related guides in this series:**
- For material selection detail including thermoplastic vs. epoxy vs. MMA comparisons, see our guide on *[Line Marking Paint & Materials Compared: Thermoplastic, Epoxy, MMA, Waterborne & More](Not specified by manufacturer)*
- For understanding how line marking costs are structured across project types including sports courts, see *[Line Marking Costs Melbourne: Pricing Breakdown by Project Type, Size & Material](Not specified by manufacturer)*
- For guidance on evaluating and selecting a qualified contractor for your school or facility project, see *[How to Choose a Line Marking Contractor in Melbourne: 10 Criteria That Separate Professionals from Cowboys](Not specified by manufacturer)*
- For understanding how long markings last under Melbourne's specific climate conditions and when to schedule repainting, see *[Line Marking Maintenance & Repainting Schedule: How Long Do Markings Last in Melbourne?](Not specified by manufacturer)*

---

## References

- Basketball Australia / FIBA. *Official Basketball Rules 2022.* International Basketball Federation (FIBA), 2022. [https://www.fiba.basketball/documents/official-basketball-rules.pdf](https://www.fiba.basketball/documents/official-basketball-rules.pdf)

- Netball Australia. *Design, Construction and Maintenance of Netball Facilities: National Facilities Policy.* Netball Australia, 2016. [https://netball.com.au/sites/default/files/2019-07/PDF-web-version-Netball-Australia-National-Facilities-Policy_mar16.pdf](https://netball.com.au/sites/default/files/2019-07/PDF-web-version-Netball-Australia-National-Facilities-Policy_mar16.pdf)

- International Tennis Federation (ITF). *Rules of Tennis 2024.* ITF Ltd, 2024. [https://www.itftennis.com/en/about-us/governance/rules-and-regulations/](https://www.itftennis.com/en/about-us/governance/rules-and-regulations/)

- Sport and Recreation Victoria. *Netball Court Planning Guide.* Department of Jobs, Skills, Industry and Regions (Victoria), 2008. [https://sport.vic.gov.au/publications-and-resources](https://sport.vic.gov.au/publications-and-resources)

- Bureau of Meteorology (Australia). *UV Index Data for Melbourne.* Australian Government Bureau of Meteorology, 2024. [http://www.bom.gov.au/uv/](http://www.bom.gov.au/uv/)

- CourtCraft Australia. "Netball Court Dimensions." *CourtCraft.au*, 2024. [https://courtcraft.au/dimensions/netball-court-dimensions/](https://courtcraft.au/dimensions/netball-court-dimensions/)

- MSF Sports. "Basketball Court Dimensions Guide (Australia): FIBA & NBA Measurements." *MSFSports.com.au*, 2024. [https://www.msfsports.com.au/basketball-court-dimensions/](https://www.msfsports.com.au/basketball-court-dimensions/)

---
## Frequently Asked Questions

What is the official length of a FIBA basketball court: 28 metres

What is the official width of a FIBA basketball court: 15 metres

What is the minimum run-off zone for basketball courts: 2 metres from court boundary

What is the standard basketball court line width: 50 mm (5 cm)

What colour are basketball court lines typically marked: White

What is the FIBA three-point arc distance from basket: 6.75 metres

What is the free-throw line distance from endline: 5.80 metres from inner edge

What is the length of the free-throw line: 3.60 metres

What is the radius of the centre circle: 1.80 metres

What is the typical size of a half-court basketball layout: Approximately 20 m × 20 m

What is the official length of a netball court: 30.5 metres

What is the official width of a netball court: 15.25 metres

What is the length of each netball court third: 10.167 metres

What is the netball goal circle radius: 4.9 metres

What is the netball centre circle diameter: 900 mm

What is the netball court line width: 50 mm

What is the mandatory run-off zone for netball courts: 3.05 m on all sides

What is the total area needed for a netball court with run-offs: Approximately 36.6 m × 21.35 m

Do netball umpires officiate inside the court: No, they officiate outside court boundaries

What is the recommended gradient for outdoor netball courts: 1% for water drainage

Are indoor netball courts sloped: No, indoor courts are flat

What is the official length of a tennis court: 23.77 metres

What is the width for singles tennis: 8.23 metres

What is the width for doubles tennis: 10.97 metres

What is the service line distance from net: 6.40 metres

What is the ITF Orange court size for under-10s: 18 m long × 6.4 m wide

What is the ITF Red court size for under-8s: 11 m long × 5.5 m wide

What is the recommended run-off behind tennis baseline: 6.4 metres

What is the tennis baseline line width: 50 mm

Can school courts use approximate dimensions: No, official dimensions are non-negotiable

Why are official dimensions required for schools: Player safety, training accuracy, and insurance coverage

Do Department of Education grants require dimensional compliance: Yes, typically require compliance documentation

What are the two dominant surfaces for Melbourne school courts: Asphalt and concrete

Which surface is more common in older Melbourne schools: Asphalt (bitumen)

What is Melbourne's peak summer UV index: Regularly exceeds 11

How often does paint on asphalt require repainting: Every 2-3 years in high-sun areas

Why does asphalt reduce paint adhesion over time: Surface oxidation makes it porous

What surface preparation is essential for old asphalt: Cleaning, crack filling, and primer coat

Which materials suit asphalt's expansion properties: Waterborne acrylic and thermoplastic

Can two-pack epoxy be used on asphalt: No, it can delaminate due to temperature movement

Which surface is preferred for new school construction: Concrete

Why is concrete preferred over asphalt: Dimensional stability, longer lifespan, better adhesion

Do concrete and asphalt require different marking approaches: Yes, different materials and preparation needed

What is the dominant line marking material for Melbourne schools: Thermoplastic

What surfaces can thermoplastic be applied to: Asphalt, bitumen, and concrete

How is thermoplastic applied to surfaces: Using a propane lance after priming

How much longer does thermoplastic last than paint: 8-10 times longer

What is the typical lifespan of thermoplastic markings: 5-10 years outdoors

What is the manufacturer warranty for thermoplastic playground designs: 5 years

Does thermoplastic have anti-slip properties: Yes, built-in anti-slip functionality

What is the lifespan of waterborne acrylic outdoors: 2-4 years

Which material has lower upfront cost: Waterborne acrylic

Which material has lower lifecycle cost: Thermoplastic

Can thermoplastic be used for custom shapes: Yes, excellent via waterjet cutting

How long until thermoplastic is walk-ready: 15-30 minutes after cooling

What is a Multi-Use Games Area (MUGA): Surface marked with multiple colour-coded sport layouts

What is the standard colour for basketball lines: White

What is the standard colour for netball lines: Red

What is the standard colour for tennis lines: Yellow

What is the standard colour for volleyball lines: Blue

Which sport gets the primary colour on multi-sport courts: The most frequently played sport

What is the maximum recommended sports per playground area: Three sports maximum

Why is there a three-sport maximum recommendation: More creates visual confusion and overlapping lines

Are basketball and netball dimensionally compatible: Yes, similar widths and same lengthwise orientation

What minimum area is needed for basketball and netball together: 32 m × 17 m when oriented same direction

How is tennis typically oriented relative to basketball: Perpendicular orientation

Which sport's lines should be applied first: Sport with most complex markings (typically basketball)

Which sport's lines should be applied last: Sports requiring critical in/out calls (tennis)

When should schools schedule line marking work: During term breaks (school holidays)

How far in advance should schools book contractors: 6-8 weeks before preferred term break

What compliance is required for workers on school sites: Working with Children cards

Can markings be applied to wet surfaces: No, surfaces must be dry

What are Melbourne's main term break windows: January, April, July, September/October

How long before playground is usable after thermoplastic: 30 minutes to 2 days depending on material

What curriculum-linked designs are available: Number grids, multiplication tables, phonics pathways

What is the key principle for playground game layout: Spatial separation to prevent crowding

Are playground markings non-toxic: Yes, modern thermoplastic is non-toxic

Can thermoplastic be customised to school curriculum: Yes, customisable in colours and shapes

What classic game designs are available: Hopscotch, four square, handball courts

What geography-integrated designs are available: Compass roses and world maps

What PE support markings are available: Target circles and fitness circuits

---

---
## Label Facts Summary

> **Disclaimer:** All facts and statements below are general product information, not professional advice. Consult relevant experts for specific guidance.

### Verified Label Facts

**Basketball Court Dimensions (FIBA Standards):**
- Court size: 28 m long × 15 m wide
- Minimum run-off zone: 2 m free from obstruction
- Line width: 50 mm (5 cm), uniform colour (typically white)
- Three-point arc distance: 6.75 m from basket
- Free-throw line: 5.80 m from inner edge of endline, 3.60 m long
- Centre circle radius: 1.80 m
- Half-court layout: Approximately 20 m × 20 m

**Netball Court Dimensions (INF/Netball Australia Standards):**
- Court size: 30.5 m long × 15.25 m wide
- Court thirds: 10.167 m each
- Goal circle radius: 4.9 m
- Centre circle: 900 mm diameter
- Line width: 50 mm
- Recommended run-off zone: 3.05 m on all sides
- Total area with run-offs: Approximately 36.6 m × 21.35 m
- Outdoor court gradient: 1% for water drainage
- Indoor courts: Flat (no gradient)

**Tennis Court Dimensions (ITF Standards):**
- Court length: 23.77 m
- Singles width: 8.23 m
- Doubles width: 10.97 m
- Service line distance from net: 6.40 m
- ITF Orange court (under-10): 18 m × 6.4 m
- ITF Red court (under-8): 11 m × 5.5 m
- Baseline line width: 50 mm
- Other lines: 25-50 mm
- Recommended run-off behind baseline: 6.4 m

**Thermoplastic Material Specifications:**
- Lifespan: 5-10 years (outdoor conditions)
- Manufacturer warranty: 5 years
- Application method: Heat-applied using propane lance
- Suitable surfaces: Asphalt, bitumen, concrete
- Walk-ready time: 15-30 minutes after cooling
- Anti-slip properties: Built-in
- Toxicity: Non-toxic

**Waterborne Acrylic Material Specifications:**
- Lifespan: 2-4 years (outdoor conditions)
- Application method: Spray or roller
- Suitable surfaces: Asphalt, concrete
- Repainting frequency on asphalt: Every 2-3 years in high-sun exposure areas

**Multi-Sport Court Standards:**
- Standard colour coding: Basketball (white), Netball (red), Tennis (yellow), Volleyball (blue)
- Maximum recommended sports per surface: 3
- Combined basketball/netball minimum area: 32 m × 17 m (same orientation)

**Melbourne Climate Data:**
- Peak summer UV index: Regularly exceeds 11 (Bureau of Meteorology)

### General Product Claims

- Official dimensions are non-negotiable for player safety, training accuracy, and insurance coverage
- Deviation from published standards may create liability exposure if injuries occur
- Department of Education facility planning guidelines align with governing body standards
- Grant-funded court upgrades typically require compliance documentation
- Incorrectly placed markings mean students train with spatial references that don't correspond to competition courts
- Undersized run-off zones create genuine injury risk
- Umpires officiate outside netball court boundaries, requiring clear run-off zones
- Asphalt is more common in older Melbourne primary schools (1960s-1990s)
- Asphalt absorbs and retains heat, accelerating paint degradation
- Older asphalt becomes oxidised and porous, reducing paint adhesion
- Surface preparation (cleaning, crack filling, primer coat) is essential before marking old asphalt
- Two-pack epoxy can delaminate on asphalt because of temperature expansion/contraction
- Asphalt has cheaper capital cost but shorter predicted lifespan and higher maintenance cost than concrete
- Concrete is preferred for new school construction because of dimensional stability, longer surface life, and better adhesion
- Thermoplastic lasts 8-10 times longer than traditional paint
- Thermoplastic offers excellent long-term value for high-use facilities
- Thermoplastic enables custom shapes and logos via waterjet cutting
- Thermoplastic has lower lifecycle cost than waterborne acrylic despite higher upfront cost
- Multi-sport overlays should be limited to three sports to prevent visual confusion
- Basketball and netball are the most compatible overlay pairing
- Tennis typically requires perpendicular orientation to basketball/netball
- Line marking on active school grounds almost always requires school holiday access
- Melbourne's term break windows fill quickly with contractors
- Schools should book 6-8 weeks in advance of preferred term break
- All staff working on school sites must hold Working with Children cards
- Markings can't be applied to wet surfaces
- Melbourne's spring and autumn weather creates unpredictable afternoon showers requiring weather contingencies
- Playground markings help schools improve meaningful recess and break time play
- Educational markings support literacy, numeracy, and science learning
- Thermoplastic playground markings enhance safety by encouraging active play
- Spatial separation prevents crowding in playground game layouts
- Professional expertise adds most value in multi-sport overlay planning
- Thermoplastic is walk-ready faster than most acrylic systems