Covering Purley
Purley sits 12 miles south of London, with Coulsdon 2 miles to the south-west and South Croydon 2 miles to the north-east.
Homes in London
Much of London’s housing is Victorian and Edwardian terraces, which is why side return extensions, rear dormers and mansards are so common. Many streets are in conservation areas, and several boroughs use Article 4 directions that remove some permitted development rights.
What do you get with a mansard loft conversion?
Mansards are a bigger structural job than other conversions because the roof is largely rebuilt. They normally need planning permission, and many councils have design guides setting the angle, materials and window style. We prepare the design to those guides and build in slate, lead and timber or approved alternatives.
- Structural design and party wall process
- Roof removal and new mansard frame
- En-suite, electrics and fire safety
How much does a mansard loft conversion cost in Purley?
Indicative costs for mansard loft conversions. London and the South East usually sit towards the top of each range.
| Mansard loft conversions | Guide price incl. VAT |
|---|---|
| Rear mansard | £65,000 to £85,000 |
| Front and rear (double) mansard | £80,000 to £110,000 |
What approvals does a mansard loft conversion need in England?
English projects need planning clearance from the local council, building regulations sign-off from building control, and party wall notices where the work is on or near a shared boundary. We prepare and manage all three.
Mansard conversions change the shape of the roof significantly, so they usually need planning permission in England.
What can change the price or programme?
- The roof is open for longer than with a dormer, so weather protection matters.
- Scaffolding and a temporary roof are usually needed.
How does the project run?
- Start with a conversation. A short call or the online form is enough for us to understand what you want to build.
- Free site visit. We measure up, look at access, drains and the structure, and talk through options and budget.
- Drawings, approvals, written quote. We prepare the design, apply for the approvals it needs, and give you a fixed price in writing.
- Construction and completion. One site lead co-ordinates every trade through to the building control certificate.
Your questions answered
Does a mansard need planning permission?
Almost always, because it changes the roof profile.
How long does a mansard take?
Around 10 to 14 weeks on site after planning approval.
How do I get a price for mansard loft conversions in Purley?
Use the guide price tool for a ballpark figure, then book a visit for a fixed written price for the agreed specification.
Mansard loft conversions near Purley
- Mansard loft conversions in Coulsdon
- Mansard loft conversions in South Croydon
- Mansard loft conversions in Carshalton
- Mansard loft conversions in Croydon
Learn more about mansard loft conversions, or see every project we cover in Purley.