Wandsworth SW18
Loft & Extension Specialists in Wandsworth
Specialist loft conversion and extension builders. FMB members.
07564 041115Our Services in Wandsworth
Loft Conversions
Dormer, mansard, hip-to-gable, and L-shaped conversions for Wandsworth's period properties.
- 8–12 week build
- From £75,000
- Planning handled
Extensions
Rear, side return, and wraparound extensions. Open-plan living designed for Wandsworth homes.
- 8–14 week build
- From £60,000
- Party wall managed
Wandsworth 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
Many extensions and loft conversions fall under permitted development. Properties in conservation areas (Wandsworth Common, Old York Road, Tonsley) may need planning permission. We assess your planning position as the first step.
Dormer conversions from £75,000, L-shaped dormers from £90,000, mansard from £100,000. Extensions from £60,000. All fixed-price quotes with no hidden costs.
Loft conversions: 8–12 weeks. Extensions: 8–14 weeks. We provide a detailed timeline before work begins.
Yes. We manage the entire party wall process including surveyor appointments and serving notices. We maintain good relationships with neighbours throughout.
A loft conversion or extension in Wandsworth typically adds 15–25% to your property's value — significantly more than the cost of the build.
Ready to talk about your project?
Free consultation. Transparent, fixed-price quote within 48 hours.