Mansard Roof Extensions · TW11 Teddington
Fixed-fee mansard roof extensions for Teddington, Bushy Park fringe, Fulwell, Hampton Wick fringe in the TW11 postcode, drawn by an MCIAT-chartered architectural technologist and submitted to Richmond Council. Richmond upon Thames applies careful householder control across Teddington, with conservation interest around Teddington Lock and the setting of Bushy Park.
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 TW11's terraces in Teddington where a standard dormer is too small. Richmond Council scrutinises mansards on townscape and precedent, especially within Teddington Lock, Kingston Road / Broad Street fringe; we design to the borough's roof guidance with a Heritage Statement where the setting requires it.
Teddington's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Teddington conservation areas — with heritage statements and planning officer negotiation built in.
Across Teddington, Bushy Park fringe, Fulwell, Hampton Wick fringe in TW11, the dominant property is edwardian and victorian terraces and inter-war semis around teddington, with larger houses toward bushy park. 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 Richmond Council judges each on design quality and neighbour impact. We survey the specific Teddington property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the TW11 streetscape.
Housing stock in TW11: Edwardian and Victorian terraces and inter-war semis around Teddington, with larger houses toward Bushy Park.
Within the district: Teddington, Bushy Park fringe, Fulwell, Hampton Wick fringe.
Streets we know in TW11: the Broom Road and Kingston Road area, the streets around Teddington Lock and the Stanley Road terraces. Each road has its own building line, boundary treatment and precedent that Richmond Council weighs when assessing a mansard roof extensions scheme.
Conservation areas: Teddington Lock, Kingston Road / Broad Street fringe. Inside these, most external work needs full planning and a Heritage Statement.
Getting around TW11: Teddington and Hampton Wick on South Western Railway.
Property values: around £400,000 for a flat and £750,000-£1.3m for a house — a useful gauge of the build value an extension or loft adds in TW11.
Borough character: Highest conservation area coverage in London; Royal Parks and Thames corridor add heritage layers; design quality heavily scrutinised.
We check against Richmond Council's mansard design guide and design to match the terrace.
Required for Teddington's conservation areas — demonstrates the mansard respects character and townscape.
Accurate photomontage showing how the mansard sits alongside neighbours — often decisive at Richmond Council committee.
Mansards invariably trigger Party Wall notices in Teddington's dense terraced streets. Structural package includes new ridge, tie beams, floor joists.
Full liaison with Richmond 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.
Yes. The Edwardian and Victorian terraces and inter-war semis around Teddington suit side-return, rear and loft extensions, much of it within Permitted Development outside the conservation areas, confirmed with a Lawful Development Certificate. We confirm the route and draw to Richmond's checklist.
Yes — conservation interest around Teddington Lock and the setting of Bushy Park mean those properties are assessed more carefully on roofline and visibility. We design sympathetically and handle the Richmond application where full planning is needed.
Usually yes outside the conservation areas — a rear dormer or hip-to-gable within the volume allowance, confirmed by a Lawful Development Certificate. We check the head height and any local constraint, then draw the scheme for Building Control too.
With TW11 houses around £750,000-£1.3m and fast trains to Waterloo, a side-return, rear or loft extension adds family space worth comfortably above the build and drawing cost. Teddington is a settled, sought-after family market, and our fixed fee keeps the professional cost predictable.
Our fixed fee for mansard roof extensions in Teddington starts at £1,575 — no hourly billing. With Teddington property at around £400,000 for a flat and £750,000-£1.3m for a house, the professional drawing fee is a small fraction of the value the work adds to TW11's edwardian and victorian terraces and inter-war semis. Richmond 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 TW11 address.
For a TW11 project across Teddington, Bushy Park fringe, Fulwell, Hampton Wick fringe, 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 Richmond Council (8 weeks for a householder application). We carry the Teddington application through every officer query to the decision.
Teddington (TW11) sits primarily in Richmond upon Thames, so applications are decided by Richmond Council. Article 4 in force in the borough: No. Conservation areas within TW11 include Teddington Lock, Kingston Road / Broad Street fringe, 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 Teddington — 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 Richmond Council Building Control or an approved inspector. On TW11'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 Teddington (TW11) property at around £400,000 for a flat and £750,000-£1.3m for a house, 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 TW11 homes.
From £840.
From £840.
From £1,225.
From £1,225.
From £995.
From £1,950.
From £350.
From £540.
From £450.
From £1,225.
Pick a slot that suits you. No obligation and no sales pressure — just straight answers on your planning route, fixed fee and timescale.
Every TW11 postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. TW11 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 |
|---|---|---|---|
| TW11 | Teddington | Edwardian villas, Victorian terraces | A mansard roof extension at an TW11 address in Teddington is determined by Richmond Council under its own Local Plan policies for Teddington. |
| SW13 | Barnes | Georgian villas, Edwardian terraces | Adjoining district to TW11, also inside Richmond upon Thames for mansard roof extension purposes. |
| SW14 | Mortlake / East Sheen | Edwardian villas, 1930s semi-detached | Adjoining district to TW11, also inside Richmond upon Thames for mansard roof extension purposes. |
| TW1 | Twickenham | Georgian fragments, Victorian terraces, Edwardian villas | Adjoining district to TW11, also inside Richmond upon Thames for mansard roof extension purposes. |
| TW2 | Twickenham / Whitton | Georgian fragments, Victorian terraces, Edwardian villas | Adjoining district to TW11, also inside Richmond upon Thames for mansard roof extension purposes. |
Roof pitch, wall build-up and plot depth change every few TW11 streets, and each one changes what a mansard roof extension can achieve at that address.
Conservation areas covering TW11 (Teddington): Richmond Council runs 72, and Richmond Green, Kew Green, Hampton Wick are the ones TW11 (Teddington) owners meet most. A mansard roof extension inside a TW11 (Teddington) conservation area loses permitted development, so the TW11 (Teddington) submission is a householder application at £258 decided in 8 weeks — not a £120 prior approval decided in 6 weeks. In Richmond Green a mansard roof extension is judged on the street elevation first.
TW11 (Teddington) permitted development status: there is no borough-wide direction from Richmond Council, so a mansard roof extension at a TW11 address is normally still permitted development. We certify that with a £129 Lawful Development Certificate rather than leaving a TW11 (Teddington) sale to argue it later.
TW11 (Teddington) housing stock: Georgian in Richmond Green and Twickenham; Edwardian villas in Barnes and East Sheen; 1930s semi-detached in Whitton; riverside cottages along the Thames. Highest conservation area coverage in London; Royal Parks and Thames corridor add heritage layers; design quality heavily scrutinised. Read that before choosing a mansard roof extension route in TW11 (Teddington) — construction, not postcode, sets what is achievable. Mansard roof extensions in TW11 (Teddington) start at £1,575 on a fixed fee, or £1,750 for the Complete package covering both Richmond Council submissions.
Sources for this TW11 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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