Configure your ideal build type, floor area, and finish standard to get an instant cost bracket.
| Build Category | Base Rate / m² | Typical Duration | Average 30m² Total |
|---|---|---|---|
| Single-Storey Rear | £1,600 / m² | 10 - 12 Weeks | ~£48,000 |
| Two-Storey Extension | £1,400 / m² | 16 - 20 Weeks | ~£42,000 (per floor) |
| Dormer Loft Conversion | £1,500 / m² | 6 - 8 Weeks | ~£45,000 |
| Mansard Loft Conversion | £1,800 / m² | 8 - 10 Weeks | ~£54,000 |
| Velux Rooflight Loft | £1,200 / m² | 4 - 6 Weeks | ~£36,000 |
| Garage Conversion | £1,000 / m² | 3 - 4 Weeks | ~£30,000 |
Standard tier includes structural build, radiators, standard electrics, and plastering. Premium (+25%) adds underfloor heating and glazing packs. Luxury (+55%) adds bespoke cabinetry, high-end sanitaryware, and smart systems.