Clapham SW4
Loft & Extension Specialists in Clapham
Specialist loft conversion and extension builders. FMB members.
07564 041115Our Services in Clapham
Loft Conversions
Dormer, mansard, hip-to-gable, and L-shaped conversions for Clapham's period properties.
- 8–12 week build
- From £75,000
- Planning handled
Extensions
Rear, side return, and wraparound extensions. Open-plan living designed for Clapham homes.
- 8–14 week build
- From £60,000
- Party wall managed
Clapham Cost Guide
| Type | Typical Cost | Planning? |
|---|---|---|
| Velux / Rooflight | £55,000 – £75,000 | Usually no |
| Rear Dormer | £75,000 – £110,000 | Often no |
| L-Shaped Dormer | £90,000 – £140,000 | Check with us |
| Mansard | £100,000 – £160,000+ | Yes |
| Rear Extension | £60,000 – £90,000 | Often no |
| Side Return | £40,000 – £60,000 | Often no |
All costs exclude VAT. Detailed quote provided before work begins.
Common Questions
Properties in Clapham Old Town, The Chase, or Clapham Common conservation areas need planning permission. We have extensive experience with Lambeth Council and handle all applications.
Side returns from £40,000, rear extensions from £65,000, loft conversions from £75,000. Fixed-price quotes with detailed specifications.
Side returns: 8–10 weeks. Rear extensions: 10–14 weeks. Loft conversions: 8–12 weeks. Detailed timeline provided before work begins.
Yes. We manage the complete party wall process for Clapham's terraced properties, including surveyor appointments and notices to neighbours.
A well-executed extension or loft conversion in Clapham typically adds 15–25% to your property's value. With average prices exceeding £1.3m, the return far outweighs the build cost.
Nearby areas we cover
Ready to talk about your project?
Free consultation. Transparent, fixed-price quote within 48 hours.