Basement Conversions · TW11 Teddington
Richmond upon Thames applies careful householder control across Teddington, with conservation interest around Teddington Lock and the setting of Bushy Park.
The borough-level guide to basement conversions in Richmond upon Thames sets out how the same work is handled across the rest of the authority.
Basement conversions and lowering existing cellars in Teddington add space without touching the roofline — valuable on TW11's period houses around Teddington, Bushy Park fringe, Fulwell, Hampton Wick fringe. Richmond Council reviews structural, drainage and flood-risk impact, and a Party Wall award plus a Thames Water build-over agreement are usually required. We coordinate the structural engineer and the waterproofing design.
Full architectural technology service for basement digs and cellar conversions in Teddington — structural underpinning design, waterproofing strategy, Party Wall coordination, planning where required, and building regulations through to completion certificate.
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 basement conversion drawings 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 basement conversion drawings 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.
Desktop study plus measured survey assessing existing foundations, ground conditions, water table level and underpinning viability for your Teddington property.
New-build basements and lightwell extensions need planning permission. Cellar conversions of existing space are usually Permitted Development. We confirm the route and submit where needed.
Underpinning sequence drawings, reinforced concrete design, temporary works strategy — all to Eurocode with chartered engineer sign-off.
BS 8102:2022 compliant — cavity drain, cementitious tanking or membrane system specified for Teddington's ground conditions and water table.
Full Plans application to Richmond Council Building Control or an approved inspector covering structure (Part A), fire safety (Part B), damp-proofing (Part C), ventilation (Part F) and thermal performance (Part L).
Almost every Teddington basement triggers Party Wall notices. We also manage Thames Water Build Over Agreements where within 3m of a public sewer.
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.
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 £548 for a householder planning application, £610 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. 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 basement conversion drawings 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. 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.
Moving, or weighing up a site in the next borough along? Here is the complete service list for SW13, SW14, TW1, TW2, TW9, TW10 and TW12.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every TW11 postcode district we draw in, the stock that dominates it and the authority that validates a basement conversion there. TW11 fees below are the statutory England rates for 2026, not basement conversion estimates.
| Postcode | Area | Dominant stock | What it means for a basement conversion |
|---|---|---|---|
| TW11 | Teddington | Edwardian villas, Victorian terraces | Teddington sits wholly inside TW11, so Richmond Council validates every basement conversion submitted from an TW11 address. |
| SW13 | Barnes | Georgian villas, Edwardian terraces | Adjoining district to TW11, also inside Richmond upon Thames for basement conversion purposes. |
| SW14 | Mortlake / East Sheen | Edwardian villas, 1930s semi-detached | Adjoining district to TW11, also inside Richmond upon Thames for basement conversion purposes. |
| TW1 | Twickenham | Georgian fragments, Victorian terraces, Edwardian villas | Adjoining district to TW11, also inside Richmond upon Thames for basement conversion purposes. |
| TW2 | Twickenham / Whitton | Georgian fragments, Victorian terraces, Edwardian villas | Adjoining district to TW11, also inside Richmond upon Thames for basement conversion purposes. |
Roof pitch, wall build-up and plot depth change every few TW11 streets, and each one changes what a basement conversion can achieve at that address.
TW11 (Teddington) conservation designations: there are 72 across Richmond Council, Barnes Village, Ham Common, Richmond Green among them. Designation costs a TW11 (Teddington) owner the permitted-development route: a basement conversion then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Barnes Village is the TW11 (Teddington) designation that most often changes a basement conversion design.
TW11 (Teddington) permitted development status: there is no borough-wide direction from Richmond Council, so a basement conversion at a TW11 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a TW11 (Teddington) sale to argue it later.
What TW11 (Teddington) is built from: 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. That mix decides the basement conversion route in TW11 (Teddington) more than the postcode does, and it is what a Richmond Council case officer reads first. A householder application costs £548 paid to Richmond Council direct, with 8 weeks to a decision once validated.
Sources for this TW11 basement conversion 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.
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