🧱 Brick Calculator
What Is This Brick Calculator?
This brick calculator helps Australian homeowners, builders and tradies estimate exactly how many bricks they need for any wall project. Simply enter your wall dimensions, choose your brick type and wall style, and the calculator tells you the total bricks, mortar volume, material cost and labour cost.
Whether you're building a garden wall, a retaining wall, a house extension or a brick fence, this tool takes the guesswork out of ordering materials. No more buying too many or running out mid-project.
When to Use This Calculator
- Planning a garden wall — Estimate bricks and cost before calling a landscaper
- Building a retaining wall — Compare brick vs sleeper vs block costs
- House extension or renovation — Get accurate material quantities for quotes
- DIY brick projects — BBQ, letterbox, planter box or fence pillar
- Tradie quoting — Quickly calculate material and labour for client quotes
Standard Brick Sizes in Australia
The standard Australian brick size is 230mm × 110mm × 76mm (length × width × height), also known as a "standard modular brick." With a 10mm mortar joint, this gives you approximately 50 bricks per square metre for a single brick wall (one brick thick).
Other common sizes include:
- Double-height bricks (230×110×162mm) — ~25 per m²
- Thin bricks / brick veneers (230×50×76mm) — Used for cladding
- Engineered bricks (Class A & B) — Higher density for retaining and load-bearing
Worked Example — Garden Wall in Melbourne
📍 Situation
A Melbourne homeowner wants to build a 6m long × 2.4m high single-brick garden wall using standard red face bricks. They need to know how many bricks to order and the total cost.
Calculation:
Wall area = 6 × 2.4 = 14.4 m²
Bricks needed = 50 bricks/m² × 14.4 = 720 bricks → +10% waste = 792 bricks
Brick cost = 792 × $3.50 = $2,772
Labour = 14.4 m² × $80 = $1,152
Total = $3,924
💡 Tip: In Melbourne suburbs like Brighton, Hawthorn or Camberwell, labour rates can be $90-$110/m² for heritage face brickwork.
Worked Example — Double Brick Retaining Wall
📍 Situation
A builder in Sydney needs a 10m long × 3m high double-brick retaining wall for a townhouse development. They need to quote the job.
Calculation:
Wall area = 10 × 3 = 30 m²
Bricks needed = 100 bricks/m² × 30 = 3,000 bricks → +10% waste = 3,300 bricks
Mortar = 3,300 ÷ 1000 × 0.3 = 0.99 m³
Brick cost = 3,300 × $2.00 = $6,600
Labour = 30 m² × $100 = $3,000
Total = $9,600
💡 Note: In NSW, retaining walls over 1m require council approval and engineering certification — factor this into your quote.
Building Regulations for Brick Walls in Australia
Each Australian state has different rules for brick walls:
- VIC: Retaining walls over 1m need a building permit. Freestanding walls over 2m require engineer certification.
- NSW: Walls over 600mm near boundaries need approval. Complying Development applies up to 3m.
- QLD: Boundary walls under 2.4m are usually exempt. Higher walls need development approval.
- WA: Walls under 3m from the boundary need approval if over 1.8m high.
Always check with your local council before starting — penalties for non-compliance can include fines and forced demolition.
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