How many bricks for a 20×20 patio?
Quick Answer
A 20×20 foot patio (400 sq ft) requires approximately 1,800–2,000 standard 4×8-inch bricks laid flat, including a 10% waste allowance. Larger bricks (6×9") reduce the count to about 1,100. Always add 10–15% extra for cuts, breakage, and future repairs.
Quick Reference Table
| Brick size | Bricks for 20×20 patio |
|---|---|
| Standard 4×8" | ~1,800 bricks (+10% waste) |
| Queen 3×7.6" | ~2,400 bricks |
| 6×9" paver | ~1,100 bricks |
| 4×4" paver | ~3,600 bricks |
How to Calculate It Yourself
- 1
Calculate patio area: 20 × 20 = 400 sq ft.
- 2
Find brick coverage: a 4×8" brick = 0.222 sq ft.
- 3
Divide: 400 ÷ 0.222 = 1,802 bricks.
- 4
Add 10% for waste: 1,802 × 1.10 = 1,982 → order 2,000 bricks.
Pro Tip
For a patio, use paving bricks (SW grade — Severe Weathering) rated for ground contact. Standard facing bricks are not freeze-thaw resistant when laid flat and will crack within a few winters.
Assumptions to Check
Before ordering materials, confirm the dimensions, product coverage, waste factor, and local installation requirements for your project. Manufacturer coverage tables and local code rules can change the final quantity, especially for structural work, exterior projects, and irregular layouts.
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