Which base should your garden room sit on?
Same 4 m × 3 m insulated office, three different foundations, priced by the same engine:
| Base | Base-stage materials | Whole build (ex VAT) |
|---|---|---|
| Ground screws | £588 | £10,119 |
| Concrete slab | £428 | £9,313 |
| Concrete pad foundations + bearers | £788 | £10,320 |
Twenty Paces is a planning aid, not professional structural or planning advice. Costs are materials-only at indicative merchant rates (excluding labour and delivery); span tables, U-values and regulations thresholds are indicative. Verify your design with a structural engineer, your local planning authority and Building Control before you build.