Mansard Roof Extensions · SE22 East Dulwich
Fixed-fee mansard roof extensions for East Dulwich, Lordship Lane, Peckham Rye, Dulwich in the SE22 postcode, drawn by an MCIAT-chartered architectural technologist and submitted to Southwark Council. SE22 is decided by Southwark Council. East Dulwich is one of London's strongest family-extension markets — rows of Victorian and Edwardian bay-fronted terraces ideal for side-return and rear extensions and loft dormers, mostly outside conservation areas, though the Dulwich fringe and Estate land carry tighter controls.
MCIAT chartered drawings for planning, building regs, lofts and extensions — fixed fees 30% below typical London architects. Tell us what you need and we’ll reply the same working day.
A mansard roof extension adds a full storey behind a new sloping front face — a strong option on SE22's terraces in East Dulwich where a standard dormer is too small. Southwark Council scrutinises mansards on townscape and precedent, especially within East Dulwich, Dulwich Village fringe, Peckham Rye; we design to the borough's roof guidance with a Heritage Statement where the setting requires it.
East Dulwich's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in East Dulwich conservation areas — with heritage statements and planning officer negotiation built in.
Across East Dulwich, Lordship Lane, Peckham Rye, Dulwich in SE22, the dominant property is victorian and edwardian terraces and bay-fronted villas across east dulwich, with larger semi-detached houses towards dulwich and the lordship lane shopping streets. That stock shapes what mansard roof extensions looks like here: the right approach for a period terrace differs from a mansion-block flat or a new-build, and Southwark Council judges each on design quality and neighbour impact. We survey the specific East Dulwich property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the SE22 streetscape.
Housing stock in SE22: Victorian and Edwardian terraces and bay-fronted villas across East Dulwich, with larger semi-detached houses towards Dulwich and the Lordship Lane shopping streets.
Within the district: East Dulwich, Lordship Lane, Peckham Rye, Dulwich.
Conservation areas: East Dulwich, Dulwich Village fringe, Peckham Rye. Inside these, most external work needs full planning and a Heritage Statement.
Getting around SE22: East Dulwich and North Dulwich (Southern), Peckham Rye nearby.
Property values: approx £750k–£1.5m for houses, £450k–£725k for flats (Land Registry, 2024) — a useful gauge of the build value an extension or loft adds in SE22.
Borough character: Dulwich Estate private planning scheme affects much of SE21 and SE22; Southwark planning for rest of borough; strong heritage context.
We check against Southwark Council's mansard design guide and design to match the terrace.
Required for East Dulwich's conservation areas — demonstrates the mansard respects character and townscape.
Accurate photomontage showing how the mansard sits alongside neighbours — often decisive at Southwark Council committee.
Mansards invariably trigger Party Wall notices in East Dulwich's dense terraced streets. Structural package includes new ridge, tie beams, floor joists.
Full liaison with Southwark Council planning officer, committee representation if called in.
Part L thermal, Part B fire (critical on mansards), Part E acoustic separation.
Single planning or building-regs submission.
Planning + building regs + structural.
Listed, conservation or complex sites.
East Dulwich SE22 is dominated by Victorian and Edwardian bay-fronted terraces with the classic side return, and Southwark Council routinely approves single-storey rear and side-return extensions under Permitted Development on these houses. It's one of the busiest family-extension markets in south London. We check your street is outside the East Dulwich conservation area and any Dulwich Estate land before relying on PD.
It can. Part of the Dulwich area is managed by the Dulwich Estate scheme of management, which adds a private consent on top of council planning for some properties towards the SE22/SE21 fringe. Most core East Dulwich terraces around Lordship Lane are unaffected. We confirm whether your address carries a Dulwich Estate consent requirement as well as Southwark planning before designing.
The Victorian and Edwardian terraces of East Dulwich SE22 take a rear or L-shaped dormer loft conversion well, often combined with a side-return kitchen extension below for a full family reconfiguration. Larger semi-detached houses can take a hip-to-gable plus dormer. We design to the roof type and confirm whether full planning or a Lawful Development Certificate is the right route.
Our fixed fee for mansard roof extensions in East Dulwich starts at £1,575 — no hourly billing. With East Dulwich property at approx £750k–£1.5m for houses, £450k–£725k for flats (Land Registry, 2024), the professional drawing fee is a small fraction of the value the work adds to SE22's victorian and edwardian terraces and bay-fronted villas. Southwark Council charges its own statutory application fee on top (currently £258 for a householder planning application, £578 for a full application). We quote the drawings as one fixed price and the free site survey covers every SE22 address.
For a SE22 project across East Dulwich, Lordship Lane, Peckham Rye, Dulwich, expect roughly 3–4 weeks from instruction to submission: week 1 the measured survey, weeks 2–3 the drawings and your revisions, then validation and the statutory determination by Southwark Council (8 weeks for a householder application). We carry the East Dulwich application through every officer query to the decision.
East Dulwich (SE22) sits primarily in Southwark, so applications are decided by Southwark Council. Article 4 in force in the borough: Yes. Conservation areas within SE22 include East Dulwich, Dulwich Village fringe, Peckham Rye, where full planning and a Heritage Statement are required. We confirm the planning route for your exact address before quoting.
Almost always. Any structural work behind mansard roof extensions in East Dulwich — new openings, steel beams, loft floors, foundations — needs Building Regulations approval covering structure (Part A), fire escape (Part B) and insulation (Part L), submitted to Southwark Council Building Control or an approved inspector. On SE22's typically terraced and semi-detached stock, a Party Wall notice to adjoining neighbours is normally required before the steelwork. We coordinate both as part of the Complete package.
In value terms, yes. With East Dulwich (SE22) property at approx £750k–£1.5m for houses, £450k–£725k for flats (Land Registry, 2024), a well-designed extension or loft typically returns more than it costs in added floor area and sale value, while our fixed drawing fee from £1,575 keeps the professional cost predictable. The bigger risk is an unapproved or non-compliant scheme — which is why council-ready drawings and a clean Building Control sign-off matter on SE22 homes.
From £840.
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Pick a slot that suits you. No obligation and no sales pressure — just straight answers on your planning route, fixed fee and timescale.
Every SE22 postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. SE22 fees below are the statutory England rates for 2026, not mansard roof extension estimates.
| Postcode | Area | Dominant stock | What it means for a mansard roof extension |
|---|---|---|---|
| SE22 | East Dulwich | Victorian and Edwardian terraces | East Dulwich sits wholly inside SE22, so Southwark Council validates every mansard roof extension submitted from an SE22 address. |
| SE1 | Bermondsey / Borough / Waterloo | Georgian terraces, post-war flats, new-build | Adjoining district to SE22, also inside Southwark for mansard roof extension purposes. |
| SE5 | Camberwell | Georgian villas, Victorian terraces | Adjoining district to SE22, also inside Southwark for mansard roof extension purposes. |
| SE15 | Peckham / Nunhead | Victorian terraces, post-war estates | Adjoining district to SE22, also inside Southwark for mansard roof extension purposes. |
| SE16 | Bermondsey / Rotherhithe | Warehouse conversions, Georgian terraces, new-build | Adjoining district to SE22, also inside Southwark for mansard roof extension purposes. |
Roof pitch, wall build-up and plot depth change every few SE22 streets, and each one changes what a mansard roof extension can achieve at that address.
How designation changes a SE22 (East Dulwich) mansard roof extension: Southwark Council maintains 43 conservation areas, including Peckham Rye, Borough, Camberwell Grove. Inside any of them a SE22 (East Dulwich) mansard roof extension cannot rely on permitted development, and the route becomes a £258 householder application determined in 8 weeks rather than a £120 prior approval in 6 weeks. Dulwich Village sets the tone for SE22 (East Dulwich) casework.
SE22 (East Dulwich) and Article 4: Article 4 for HMOs borough-wide; additional Article 4 for office-to-residential in Bermondsey and Elephant & Castle. A mansard roof extension planned at a SE22 address is checked against that direction first; Southwark Council publishes the SE22 (East Dulwich) extent, and the SE22 line rarely follows the SE22 (East Dulwich) boundary you would expect.
The building fabric around SE22 (East Dulwich): 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 SE22 (East Dulwich) is scoped against that stock first. Our SE22 (East Dulwich) fixed fee starts at £1,575; the £1,750 Complete package runs the SE22 (East Dulwich) scheme through Southwark Council planning and building control in one go.
Sources for this SE22 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.
Free fixed quote in 60 seconds. From £1,575. MCIAT chartered.
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