Mansard Roof Extensions in Dulwich Village

Where in Dulwich Village does a mansard roof extension actually get determined?

Every Dulwich Village postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. Dulwich Village fees below are the statutory England rates for 2026, not mansard roof extension estimates.

How does a mansard roof extension differ street by street across Dulwich Village?

Roof pitch, wall build-up and plot depth change every few Dulwich Village streets, and each one changes what a mansard roof extension can achieve at that address.

• Dulwich Village (SE21) — a mansard roof extension in Dulwich Village starts from georgian villas, edwardian villas (dulwich estate), and Dulwich Village reads as Georgian and Edwardian villas, Estate-managed. Mansards read as original on Georgian terraces in SE21. Southwark Council assesses Dulwich Village mansard roof extensions against its own Dulwich Village character guidance, and the location plan we draw for Dulwich Village references Dulwich Picture Gallery.
• Near Dulwich Village: East Dulwich (SE22) — a mansard roof extension in East Dulwich starts from victorian and edwardian terraces, and East Dulwich reads as Victorian and Edwardian terraces. A mansard on a Victorian terrace almost always needs full planning permission in SE22. Southwark Council assesses East Dulwich mansard roof extensions against its own East Dulwich character guidance, and the location plan we draw for East Dulwich references Lordship Lane.
• Near Dulwich Village: Rotherhithe (SE16) — mansard roof extension work in Rotherhithe means warehouse conversions, post-war estates, new-build. Rotherhithe is warehouse conversions, riverside. Mansards on post-war blocks are a structural and fire-strategy exercise before they are an aesthetic one throughout SE16. Southwark Council decides the Rotherhithe application, and Surrey Quays anchors the Rotherhithe location plan.
• Near Dulwich Village: Elephant and Castle (SE1, SE17) — regenerated quarter, modernist origins defines Elephant and Castle, where post-war estates, new-build towers set what a mansard roof extension can do. Mansards on post-war blocks are a structural and fire-strategy exercise before they are an aesthetic one across SE1. Any Elephant and Castle mansard roof extension is validated by Southwark Council, with Elephant and Castle station the usual Elephant and Castle reference point on the site plan.
• Near Dulwich Village: Nunhead (SE15) — a mansard roof extension in Nunhead starts from victorian terraces, and Nunhead reads as Victorian terraces around the cemetery. A mansard on a Victorian terrace almost always needs full planning permission in SE15. Southwark Council assesses Nunhead mansard roof extensions against its own Nunhead character guidance, and the location plan we draw for Nunhead references Nunhead Cemetery.
• Near Dulwich Village: Bermondsey (SE1, SE16) — a mansard roof extension in Bermondsey starts from warehouse conversions, georgian terraces, new-build, and Bermondsey reads as warehouse conversions, Georgian fragments. Mansards read as original on Georgian terraces in SE1. Southwark Council assesses Bermondsey mansard roof extensions against its own Bermondsey character guidance, and the location plan we draw for Bermondsey references Bermondsey Street.
• Near Dulwich Village: Borough (SE1) — Georgian and Victorian terraces, market quarter defines Borough, where georgian and victorian terraces, warehouse conversions set what a mansard roof extension can do. Mansards read as original on Georgian terraces across SE1. Any Borough mansard roof extension is validated by Southwark Council, with Borough Market the usual Borough reference point on the site plan.

How do conservation areas and Article 4 affect a mansard roof extension in Dulwich Village?

Conservation areas covering Dulwich Village: Southwark Council runs 43, and Dulwich Village, Peckham Rye, Borough are the ones Dulwich Village owners meet most. A mansard roof extension inside a Dulwich Village conservation area loses permitted development, so the Dulwich Village submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Peckham Rye a mansard roof extension is judged on the street elevation first.

Article 4 and your Dulwich Village mansard roof extension: Article 4 for HMOs borough-wide; additional Article 4 for office-to-residential in Bermondsey and Elephant & Castle. At a SE21 address that matters twice over, because Southwark Council applies the direction unevenly across Dulwich Village — we read the Dulwich Village policies map for the exact SE21 address before quoting mansard roof extensions.

The building fabric around Dulwich Village: Georgian and Regency in Bermondsey and Borough; Victorian terraces in Camberwell and Peckham; Dulwich Estate controlled housing; riverside new-build. Dulwich Estate private planning scheme affects much of SE21 and SE22; Southwark planning for rest of borough; strong heritage context. A mansard roof extension in Dulwich Village is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Southwark Council.

What happens if a Dulwich Village property sits on a boundary?

• Lewisham — the Lewisham boundary runs against Southwark, so a mansard roof extension a street from Dulwich Village is decided by Lewisham Council instead. Lewisham runs 30 conservation areas across SE3 and its neighbours, which is why mansard roof extensions priced for Dulwich Village are re-checked against Lewisham policy whenever the Dulwich Village address sits on that edge.
• Bromley — the Bromley boundary runs against Southwark, so a mansard roof extension a street from Dulwich Village is decided by Bromley Council instead. Bromley runs 48 conservation areas across BR1 and its neighbours, which is why mansard roof extensions priced for Dulwich Village are re-checked against Bromley policy whenever the Dulwich Village address sits on that edge.
• Tower Hamlets — cross the Dulwich Village boundary and Tower Hamlets Council takes the mansard roof extension instead, applying 58 conservation areas of its own around E1. We re-price mansard roof extensions at the Dulwich Village edge because Tower Hamlets policy and Southwark policy rarely align on mansard roof extension depth.
• City of London — cross the Dulwich Village boundary and City of London Corporation takes the mansard roof extension instead, applying 27 conservation areas of its own around EC1. We re-price mansard roof extensions at the Dulwich Village edge because City of London policy and Southwark policy rarely align on mansard roof extension depth.

Sources for this Dulwich Village mansard roof extension 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.