L-shaped dormers, rear dormers and mansards for Clapham’s terraces, with the planning route checked first.
We convert lofts across Clapham and SW4. On the Victorian and Edwardian terraces around Abbeville Road, Clapham South and Clapham Manor, an L-shaped dormer usually gives you a double bedroom and a bathroom under the existing roof. Where a house sits in one of Clapham’s conservation areas, or is listed, the options narrow, so we confirm what is achievable before you pay for full drawings.
Clapham’s late Victorian terraces have roofs steep enough for a useful conversion, and the back addition gives room for a second dormer. Joined as an L-shape, the two make space for a bedroom at the front and a shower room or dressing area over the back addition.
The planning route depends on the house. Outside a conservation area, a rear dormer on a house is often permitted development, which we confirm with a lawful development certificate. Inside one, any roof extension needs a planning application. A listed house needs listed building consent, and the council may only accept a modest design, sometimes rooflights alone.
Typical build: 8 to 12 weeks on site
Most common: L-shaped rear dormer
Conservation areas: Planning application needed
Covered: SW4, plus SW8, SW9, SW11 and SW12 edges
Picked to suit the roof, the street and the planning position.
A lot of Clapham sits inside a conservation area: Lambeth’s large Clapham conservation area around the Common, smaller ones such as Rectory Grove, Sibella Road and Clapham Park and Northbourne Road, and Wandsworth’s conservation area on its side of the Common. In all of them a dormer needs planning permission. Planners look closely at what can be seen from the street and at what neighbours on the same terrace have already built.
Wandsworth’s appraisal for its part of the Common lists hip-to-gable roof extensions among the changes that harm the area, so on that side we would normally steer you towards a rear dormer or a mansard instead. On the listed houses near the Old Town and the Common, we start with a conversation about what the council is likely to accept before any detailed design.
We check headroom, structure and planning status, then send a written quote.
Drawings and calculations, then a lawful development certificate, planning or listed building consent.
Steels, new floor, dormer, stairs and insulation, with the scaffold up for as short a time as possible.
Protected stair, fire doors and alarms checked by building control.
Outside a conservation area, a rear dormer on a house is often permitted development, and we would get a lawful development certificate to confirm it. Inside a conservation area, any roof extension needs planning permission. Listed houses need listed building consent.
It depends on the street. Planners give weight to what already exists on the terrace, so a mansard is more likely to be approved where neighbours have similar ones. We look at the street and its planning history before advising.
Sometimes, but consent is needed and the design is usually modest, such as rooflights on the rear slope without a dormer. We talk through what is realistic before any detailed design.
Around 8 to 12 weeks on site, depending on whether it is a single dormer, an L-shape or a mansard. You get a programme with your quote.
Usually not. Most of the work happens from the scaffold and inside the loft, and we only open up the existing stairs towards the end of the job.
Loft Conversions is one of ten building services we offer across Clapham and SW4. If your project needs more than one, we run them as a single job.
Tell us about your property and preferred timeline and we will get you a quote.
