House Extensions Teddington
Single storey rear and double storey extensions in Teddington, planning, structure and build under one contract.
- Rated 4.9 from 31 reviews on MyBuilder
- Single-storey rear extension from £40,000
- Free site survey, itemised quote
GS Renovation plans and builds extensions across Teddington, working with the bay-fronted Victorian and Edwardian terraces, closet wings and side returns that define TW11. We take rear, side-return and wrap-around projects from foundations and steelwork through to the final fit-out, all under Richmond Council building control.
In Teddington, a single-storey rear extension typically starts from £40,000, or £2,000 to £2,800 per m² (indicative London ranges, Architecture for London, Resi, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Teddington: the structural engineer we appoint designs the structure, we build it, and building control signs it off.
Price guide
| Work | Indicative London range |
|---|---|
| Single-storey rear extension | from £40,000 |
| Rear extension, per m² | £2,000 to £2,800 |
| Side return, per m² | £2,400 to £3,200 |
| Wraparound, per m² | £2,400 to £3,200 |
| Double storey, per m² | £1,800 to £2,600 |
| Basement extension | see the basement page |
Indicative London ranges (Architecture for London, Resi, MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: Extension Costs & Planning.
Quick estimate for Teddington
Teddington range: choose above
Side-return and rear extensions in Teddington
The classic Teddington extension fills the side return, the narrow strip of yard beside the closet wing, to widen a cramped Victorian kitchen into a proper open-plan space. We dig and pour foundations to suit the local ground, form the new walls and install a steel beam across the old rear opening so the room reads as one. A wrap-around scheme continues past the closet wing to add real depth, with rooflights bringing daylight into the middle of the plan.
Because these terraces sit on tight plots close to their neighbours, we plan the build to keep disruption down, protecting the party wall and managing access along a narrow TW11 street. Double-storey rear extensions add a bedroom or bathroom above the new ground floor, which means heavier foundations and steel again sized by a structural engineer. We handle the groundworks, roofing, glazing and full internal fit-out so you deal with one team throughout.
Housing in Teddington
Take the 11,670 or so homes the valuation list gives Teddington: 49% flats, 51% houses, 40% from before 1919, 13% interwar and 47% post-war. Terraced houses make up 27% of homes here, and a rear extension on a terrace in Teddington digs foundations close to both neighbours, so notices to both are normal.
Teddington extension planning under the new Richmond Local Plan
The new Richmond Local Plan and Policies Map was adopted on 7 October 2025, so a Teddington extension going to planning now is judged against it. If drawings were prepared, or advice taken, before that date, check them against the new plan before submitting. Richmond's category 6 householder pre-application advice does not include a meeting with a planning officer, so expect written comments rather than a site discussion, and allow time to revise the drawings afterwards. The target for deciding a householder application is 8 weeks, and that period belongs in the programme.
49% of Teddington homes are flats, and that matters for extensions more than for any other job. A ground floor flat does not carry the householder permitted development rights that a house has, so a rear extension to one goes to planning from the outset. The lease matters as much as the plan. The garden may be let with the flat or kept by the freeholder, and building on it can need the freeholder's consent and a variation to the lease. We ask to see the lease plan before any extension is drawn.
Planning permission and building regs in TW11
Some Teddington extensions fall under permitted development, while others need a full planning application to Richmond Council, and which route applies depends on the property. Size, height, how much you have already extended and whether the home sits within a conservation area or is listed all change the answer. Flats have no permitted development rights at all. We assess your house honestly, tell you which path fits and coordinate the drawings with your architect or designer, rather than assuming every scheme can be built under permitted development rights.
Whichever planning route applies, the structural work itself is governed by building regulations, so the foundations, steel beams, drainage, insulation and fire safety are all inspected and signed off by building control. Where the extension touches a shared boundary or party wall, you serve the correct notices too, as building owner, and we give you the drawings they need. Keeping planning and building regs clearly separate means no surprises, a lawful build and a finished extension that adds lasting value to a Teddington home.
Kitchen extensions in Teddington
53% of the houses in Teddington are terraced. On a terrace the kitchen extension is built out from the back, into the side return where the house has one or across the full rear width, and a steel beam takes the old back wall so the kitchen and the new room become one space. The fit-out is priced on its own page, kitchen renovation in Teddington; the build figures are in the table above.
Double storey extensions in Teddington
Under permitted development a two-storey rear extension can go no more than 3 metres beyond the original rear wall and must stay at least 7 metres from the rear boundary, and in a conservation area it is not permitted development at all. Many gardens are too short for the 7 metre rule, so a double storey extension in Teddington often needs planning permission from Richmond Council. On the 27% of homes that are terraced, the neighbours' windows usually decide the depth. Richmond lists an Article 4 Direction in conservation area CA22 covering Clarence Road, Teddington (council source). Our double storey extension page explains the build, at £1,800 to £2,600 per m² across both floors.
- First fix and second fix plumbing and electrics throughout
- Drainage diversion and build-over agreements with the water authority
- Full fit-out, finishing and making good
VOA Council Tax stock of properties, March 2025, for Teddington North, Teddington Central and Hampton Wick & Teddington East. Counts rounded by the VOA.
Why Choose GS Renovation in Teddington
Teddington homeowners choose GS Renovation because we handle the extension end to end, from foundations and steel to roofing, glazing and fit-out, with one team accountable throughout. With our founder's 30+ years on the tools, we advise honestly on permitted development versus a Richmond Council application, plan around the party wall notices you serve and build to full building regulations so the finished space is sound and lawful.
- Waste cleared as we go, not left piled up outside
- Garden levels and access made good where the build meets outside
- Weathertight shell reached before the fit-out begins
Built a new extension at rear of property. Laid foundations, drainage, raised floor, new roof and completed all fixtures and interior decoration…
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
Saaid is the best craftsman I have worked with. He knows what he is doing from the very beginning. He has a great knowledge of construction…
FAQ
Frequently Asked Questions about House Extensions Teddington
What happens to the house extensions price if the scope changes in Teddington?
The house extensions price in Teddington moves visibly when the scope changes, because the quotation is itemised within £2,000 to £2,800 per m² for a rear extension (indicative). A change at TW11 is priced against the same lines rather than renegotiated, and any change touching the approvals, such as building regulations approval from foundations to completion, is flagged. GS Renovation issues a written variation and waits for approval.
Will my Teddington side-return extension need planning permission?
It might, or it might qualify as permitted development, and it depends on your terrace. Size, height, previous extensions and whether you are in a conservation area all matter in TW11. In a conservation area a side-return infill counts as a side extension, so it needs permission. We assess your property, tell you which route applies and coordinate the drawings for Richmond Council if needed. Either way the structure is signed off separately under building regulations by building control.
Can a Teddington semi be extended at the side?
Possibly, but check the planning route first. Side extensions on houses can fall under permitted development, but conservation areas remove side extension rights, so a planning application to Richmond Council would be needed there. Building regulations apply either way, and the foundations near the boundary may trigger a party wall notice.
Can a Teddington extension have a fully glazed roof?
It can, but the glass affects two things. Part L limits heat loss, so a large glazed roof is balanced by better insulation elsewhere in the extension. A glazed roof facing south can also overheat a kitchen in summer. Rooflights or a lantern over part of the roof, set close to the old rear wall where the house is darkest, often give the light without those problems.
What happens to the boiler flue on the rear wall when a Teddington house is extended?
It usually has to move. Once the extension is built, a flue on the old rear wall would discharge into the new room, so the boiler or its flue is relocated before the extension is closed in. A Gas Safe registered engineer does that work. Planning the new position early avoids a late surprise.
What happens to a bathroom window covered by a Teddington rear extension?
It loses its natural ventilation, so the bathroom needs mechanical extraction ducted to outside under Part F, usually up through its own ceiling or across into the new roof void. That duct is planned before the extension roof is closed. A closet wing bathroom may also lose its daylight, so a sun pipe or high borrowed light is worth considering at design stage.
Can we add a basement under a new Teddington extension near the Thames?
Only with planning permission. Richmond's Article 4 Directions on basements and subterranean developments together cover the whole of the borough, and since 1 April 2018 permission has also been required for basement and subterranean developments within the flood hazard areas. Near the river and Teddington Lock, check whether your address falls within those areas, because flood risk will shape the design. Richmond Local Plan Policy 54 also resists basement development of more than one storey below existing ground level, so a single level is the brief.
Does the size of a Teddington extension change the building control charge band?
Yes. Richmond sets its standard domestic charges by floor area, with one band for an extension under 40 square metres and the next for one over 40 and under 60 square metres. Those base charges took effect from 1 April 2026. If a design lands just over 40 square metres, it is worth knowing before the drawings are fixed. In Richmond a Full Plans application and a Building Notice cost exactly the same, so the band matters more than the route.
Does a single storey rear extension in a Teddington conservation area need planning permission?
Richmond lists front and side extensions of one storey or more, and two storey rear extensions, among the works needing permission in its conservation areas. A single storey rear extension to a house is not on that list, so it can still be permitted development within the national size limits, unless an Article 4 Direction removes that right. High Street (Teddington) Conservation Area number 37 was designated on 07.09.1982, so check the depth, height and materials against those limits before drawings are finished.
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