Rear Dormer Loft Conversion Drawings in Lewisham

Where in Lewisham does a rear dormer actually get determined?

Every Lewisham postcode district we draw in, the stock that dominates it and the authority that validates a rear dormer there. Lewisham fees below are the statutory England rates for 2026, not rear dormer estimates.

What changes about a rear dormer in each part of Lewisham?

Roof pitch, wall build-up and plot depth change every few Lewisham streets, and each one changes what a rear dormer can achieve at that address.

• Blackheath (SE3) — rear dormer work in Blackheath means georgian villas, victorian terraces. Blackheath is Georgian and Victorian villas around the heath. A dormer on a Georgian roof has to sit behind the parapet line to stand any chance of consent throughout SE3. Lewisham Council decides the Blackheath application, and Blackheath anchors the Blackheath location plan.
• Catford (SE6) — rear dormer work in Catford means 1930s semi-detached, post-war flats. Catford is 1930s semi-detached, post-war centre. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis throughout SE6. Lewisham Council decides the Catford application, and Catford Cat anchors the Catford location plan.
• Deptford (SE8) — Georgian fragments, regenerating quarter defines Deptford, where georgian terraces, post-war estates, new-build set what a rear dormer can do. A dormer on a Georgian roof has to sit behind the parapet line to stand any chance of consent across SE8. Any Deptford rear dormer is validated by Lewisham Council, with Deptford High Street the usual Deptford reference point on the site plan.
• Hither Green (SE13) — rear dormer work in Hither Green means edwardian terraces, 1930s semi-detached. Hither Green is Edwardian terraces, 1930s semi-detached. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses throughout SE13. Lewisham Council decides the Hither Green application, and Mountsfield Park anchors the Hither Green location plan.
• Sydenham (SE26) — a rear dormer in Sydenham starts from victorian villas, edwardian terraces, and Sydenham reads as Victorian villas, Edwardian terraces. Full-width rear dormers on Victorian terraces here are the default in SE26. Lewisham Council assesses Sydenham rear dormers against its own Sydenham character guidance, and the location plan we draw for Sydenham references Sydenham Wells Park.
• Brockley (SE4) — a rear dormer in Brockley starts from victorian and edwardian terraces, and Brockley reads as Victorian and Edwardian terraces. Full-width rear dormers on Victorian terraces here are the default in SE4. Lewisham Council assesses Brockley rear dormers against its own Brockley character guidance, and the location plan we draw for Brockley references Brockley station.
• Forest Hill (SE23) — a rear dormer in Forest Hill starts from victorian villas, edwardian terraces, and Forest Hill reads as Victorian villas, Edwardian terraces. Full-width rear dormers on Victorian terraces here are the default in SE23. Lewisham Council assesses Forest Hill rear dormers against its own Forest Hill character guidance, and the location plan we draw for Forest Hill references Horniman Museum.

What local planning policy applies to a rear dormer in Lewisham?

Conservation areas covering Lewisham: Lewisham Council runs 30, and Lee Green, Blackheath, Deptford High Street are the ones Lewisham owners meet most. A rear dormer inside a Lewisham conservation area loses permitted development, so the Lewisham submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Blackheath a rear dormer is judged on the street elevation first.

Lewisham permitted development status: there is no borough-wide direction from Lewisham Council, so a rear dormer at a SE4 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a Lewisham sale to argue it later.

What Lewisham is built from: Victorian and Edwardian terraces across Brockley, Honor Oak, Forest Hill; 1930s semi-detached in Catford and Hither Green; post-war mixed in Deptford. Generally permissive planning compared to central boroughs; loft conversions and side-return extensions routinely approved under PD. That mix decides the rear dormer route in Lewisham more than the postcode does, and it is what a Lewisham Council case officer reads first. A householder application costs £548 paid to Lewisham Council direct, with 8 weeks to a decision once validated.

Which neighbouring authorities border Lewisham?

• Southwark — cross the Lewisham boundary and Southwark Council takes the rear dormer instead, applying 43 conservation areas of its own around SE1. We re-price rear dormers at the Lewisham edge because Southwark policy and Lewisham policy rarely align on rear dormer depth.
• Greenwich — cross the Lewisham boundary and Greenwich Council takes the rear dormer instead, applying 20 conservation areas of its own around SE3. We re-price rear dormers at the Lewisham edge because Greenwich policy and Lewisham policy rarely align on rear dormer depth.
• Bromley — the Bromley boundary runs against Lewisham, so a rear dormer a street from Lewisham is decided by Bromley Council instead. Bromley runs 48 conservation areas across BR1 and its neighbours, which is why rear dormers priced for Lewisham are re-checked against Bromley policy whenever the Lewisham address sits on that edge.
• Tower Hamlets — adjoining Lewisham, with 58 conservation areas centred on E1. A rear dormer on the far side of the Lewisham line is determined by Tower Hamlets Council, so the Lewisham quote for rear dormers is checked against Tower Hamlets guidance before it is issued.

Sources for this Lewisham rear dormer page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.