A simple method to estimate every material for an extra room.
Good estimates avoid delays and over-spend. Here is how to size the materials for a room.
| Element | Materials | Rule of thumb |
|---|---|---|
| Walls | bricks + mortar | ~50 bricks/m² |
| Slab/floor | concrete + mesh | ~0.1m³/m² |
| Roof | trusses + sheeting | per span |
Why builders choose us
- ~50 bricks/m² walls
- ~7 cement bags/m³ concrete
- Roof to span & pitch
- Add 10% waste on all
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Frequently asked questions
How do I estimate building materials?
Work out wall area (×~50 bricks/m²), concrete volume (×~7 cement bags/m³), and roof by span — then add ~10% waste.
How many bricks for a room?
Multiply the wall area in m² by about 50 for a single-skin wall, then add for openings and waste.