Mansard roof extension in Nunhead

Where in Nunhead does a mansard roof actually get determined?

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

What changes about a mansard roof in each part of Nunhead?

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

• Nunhead (SE15) — a mansard roof 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 roofs against its own Nunhead character guidance, and the location plan we draw for Nunhead references Nunhead Cemetery.
• Near Nunhead: Bermondsey (SE1, SE16) — warehouse conversions, Georgian fragments defines Bermondsey, where warehouse conversions, georgian terraces, new-build set what a mansard roof can do. Mansards read as original on Georgian terraces across SE1. Any Bermondsey mansard roof is validated by Southwark Council, with Bermondsey Street the usual Bermondsey reference point on the site plan.
• Near Nunhead: Borough (SE1) — Georgian and Victorian terraces, market quarter defines Borough, where georgian and victorian terraces, warehouse conversions set what a mansard roof can do. Mansards read as original on Georgian terraces across SE1. Any Borough mansard roof is validated by Southwark Council, with Borough Market the usual Borough reference point on the site plan.
• Near Nunhead: Camberwell (SE5) — mansard roof work in Camberwell means georgian villas, victorian terraces. Camberwell is Georgian villas, Victorian terraces. Mansards read as original on Georgian terraces throughout SE5. Southwark Council decides the Camberwell application, and Camberwell Green anchors the Camberwell location plan.
• Near Nunhead: Peckham (SE15) — a mansard roof in Peckham starts from victorian terraces, post-war estates, and Peckham reads as Victorian terraces, creative renewal. A mansard on a Victorian terrace almost always needs full planning permission in SE15. Southwark Council assesses Peckham mansard roofs against its own Peckham character guidance, and the location plan we draw for Peckham references Peckham Rye.
• Near Nunhead: Dulwich Village (SE21) — mansard roof work in Dulwich Village means georgian villas, edwardian villas (dulwich estate). Dulwich Village is Georgian and Edwardian villas, Estate-managed. Mansards read as original on Georgian terraces throughout SE21. Southwark Council decides the Dulwich Village application, and Dulwich Picture Gallery anchors the Dulwich Village location plan.
• Near Nunhead: East Dulwich (SE22) — Victorian and Edwardian terraces defines East Dulwich, where victorian and edwardian terraces set what a mansard roof can do. A mansard on a Victorian terrace almost always needs full planning permission across SE22. Any East Dulwich mansard roof is validated by Southwark Council, with Lordship Lane the usual East Dulwich reference point on the site plan.

Does Nunhead planning policy restrict a mansard roof?

How designation changes a Nunhead mansard roof: Southwark Council maintains 43 conservation areas, including Bermondsey Street, Dulwich Village, Peckham Rye. Inside any of them a Nunhead mansard roof cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Borough sets the tone for Nunhead casework.

What Article 4 removes near Nunhead: Article 4 for HMOs borough-wide; additional Article 4 for office-to-residential in Bermondsey and Elephant & Castle. Before pricing a mansard roof we check whether the SE15 address is inside the mapped area, because Southwark Council draws the Nunhead boundary street by street rather than across the whole of Nunhead.

The building fabric around Nunhead: 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 in Nunhead is scoped against that stock first.

Who decides a mansard roof on the edge of Nunhead?

• Lewisham — the Lewisham boundary runs against Southwark, so a mansard roof a street from Nunhead is decided by Lewisham Council instead. Lewisham runs 30 conservation areas across SE3 and its neighbours, which is why mansard roofs priced for Nunhead are re-checked against Lewisham policy whenever the Nunhead address sits on that edge.
• Bromley — cross the Nunhead boundary and Bromley Council takes the mansard roof instead, applying 48 conservation areas of its own around BR1. We re-price mansard roofs at the Nunhead edge because Bromley policy and Southwark policy rarely align on mansard roof depth.
• Tower Hamlets — the Tower Hamlets boundary runs against Southwark, so a mansard roof a street from Nunhead is decided by Tower Hamlets Council instead. Tower Hamlets runs 58 conservation areas across E1 and its neighbours, which is why mansard roofs priced for Nunhead are re-checked against Tower Hamlets policy whenever the Nunhead address sits on that edge.
• City of London — adjoining Nunhead, with 27 conservation areas centred on EC1. A mansard roof on the far side of the Nunhead line is determined by City of London Corporation, so the Nunhead quote for mansard roofs is checked against City of London guidance before it is issued.

Sources for this Nunhead mansard roof 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.