Structural Alterations Kew
Structural alterations, new openings, underpinning and floor structures in Kew, designed by the engineer we appoint and inspected at every stage.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: from £1,500
- Free site survey, itemised quote
GS Renovation carries out structural alterations throughout Kew, where bay-fronted Victorian and Edwardian terraces with rear closet wings and side returns often need new openings, replacement joists or supported openings. We prop and install each change to the engineer's design, and Richmond Council building control inspects and signs it off.
In Kew, a simple new opening starts from £1,500, and underpinning a single elevation typically costs £6,000 to £21,000 (indicative London ranges, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Kew.
Price guide
| Work | Indicative London range |
|---|---|
| Simple new opening | from £1,500 |
| Underpinning, single elevation | £6,000 to £21,000 |
| Major structural works | from £15,000 |
Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: RSJ & Load-Bearing Walls.
How the job runs
- Free site survey at your Kew address and an itemised quote.
- The engineer we appoint designs the work, and it is registered with Richmond Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
- Props and any trial holes first, then the opening, joists or underpinning in the engineer's sequence.
- Building control inspects each stage before it is covered, then issues the completion certificate.
Structural alterations for Kew period homes
The rear closet wings and side returns on Kew's terraces are where most structural alterations happen: a new opening between the kitchen and the return, a wider doorway into the dining room, or replacement joists where a floor has sagged over a century of use. Each case starts with a structural engineer specifying the beam or lintel, its bearings and the padstones needed to carry the load.
Where original timbers are decayed or undersized, we splice or replace joists and build in proper support before opening anything up. If ground movement has affected a corner or bay, the engineer may specify underpinning, which we carry out in sequenced bays so the wall above stays fully supported throughout the works.
Housing in Kew
About 4,470 homes are listed for Kew, and the mix is 57% houses to 43% flats, with 31% built after 1945, 6% in 1919 to 1939 and 62% earlier. Terraced houses make up 31% of homes here, and underpinning the party wall of a terrace in Kew needs a notice to the neighbour.
Underpinning and new openings in Kew's older houses
Richmond advises a Building Notice only for very simple work, and names underpinning and simple structural alterations among its examples. For a Kew house that is useful but easy to misread. The notice route is lighter on paperwork, yet the underpinning itself still needs a design from the structural engineer we appoint, with a sequence of short bays that keeps the wall supported throughout. On a party wall, the building owner also has to serve notice on the adjoining owner before any digging starts.
With 62% of Kew homes built before 1919 and 3% built in 2000 or later, an alteration here is likely to meet shallow Victorian footings. A new opening gathers load at its two bearings, and a footing that has carried a wall evenly for over a century may not take a concentrated load without help. The engineer's calculations decide whether a bearing needs a new pad beneath it. If it does, that small excavation is programmed with the opening, and building control sees it open before concrete goes in.
Engineered openings signed off in TW9
Every supported opening we form is temporarily propped, cut in stages and given a steel beam bearing onto padstones sized for the masonry above, never a shortcut. Richmond Council building control inspects the work under the Building Regulations and issues the certificate, which matters when you later come to sell a home near Kew Gardens and a surveyor asks for the paperwork.
Because these walls are usually shared with the neighbouring terrace, alterations that affect the party wall are notifiable under the Party Wall Act, and you serve the notices before starting. From the engineer's drawings through to the completion certificate, one team coordinates the lot, so your alteration is properly designed, safely built and fully documented.
- Basement and cellar alterations with retaining support
- Crack repair, helical bar stitching and masonry restraint
- Chimney breast removal and support to the stack above
VOA Council Tax stock of properties, March 2025, for Kew Gardens. Counts rounded by the VOA.
Trusted Structural Alterations in Kew
For structural alterations in Kew, GS Renovation gives you a single accountable team coordinating the engineer's design, safe propping and Richmond Council building control sign-off. Whether it is a new opening in a closet wing, replacement joists or underpinning, we work cleanly in your occupied TW9 home and see every change signed off by building control, backed by our founder's 30+ years of experience.
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FAQ
Frequently Asked Questions about Structural Alterations Kew
What is the going rate for structural alterations around Kew?
Structural alterations around Kew typically costs £1,500 to £21,000 or more, from a simple opening to underpinning one elevation (indicative), but scope varies more than the market does. Two Kew jobs of the same size can be different work, because what each wall and floor carries decides the design. GS Renovation surveys and prices each on its merits at TW9, with the Richmond Council building control fee shown separately.
My Victorian terrace in Kew has a sagging floor. Can you replace the joists as a structural job?
Yes. Sagging floors in Kew's older terraces often mean undersized, decayed or over-spanned joists. A structural engineer inspects and specifies replacement or additional joists and their support, we prop as needed and install them, and Richmond Council building control signs the work off under the Building Regulations. If a party wall is involved, you serve the required notices first.
Why has the bay on my Kew house cracked away from the main wall?
Often because the bay sits on a shallower footing than the house it is attached to. In many pre-1919 TW9 terraces the bay was built as a lighter structure, so it can move independently with seasonal ground changes or a leaking drain nearby. An engineer checks whether the movement is active before deciding between rebuilding the junction, tying the bay back or deepening its foundation.
Can the wall between my Kew closet wing bathroom and the landing come out?
Possibly, but check what it holds first. In a closet wing the upstairs walls may carry the ceiling joists and part of the roof over the bathroom, and the wing itself is often built more lightly than the main house. The engineer confirms the loads, and a small beam or lintel may be needed. Building control inspects any structural change before the ceiling is closed up.
What structural consents does a Kew conversion flat need?
Two at least. The VOA puts 43% of Kew dwellings in the flat category, and a TW9 conversion usually has a lease that reserves structural change to the freeholder, so their licence is the opening step. Richmond Council building control then approves the engineer's design. Because the floor between two flats is also the fire separation, any ceiling opened for a beam must be rebuilt to that standard.
Why are the lintels over my Kew sash windows failing?
In many Victorian houses a timber lintel sits behind the brick arch you see from outside, carrying the inner part of the solid wall. Over a century, damp gets in and the timber rots or sags, leaving cracks above the window inside. The repair is to prop the wall above and replace the timber with a concrete or steel lintel, which building control treats as structural work.
Does knocking down an old rear outbuilding in a Kew conservation area need permission?
It turns on size. Planning permission is required in Richmond to demolish an unlisted building of 115 cubic metres or more, completely or substantially, within a conservation area. A small shed or wash house falls well below that volume, while a large garage or workshop may not. Measure the outbuilding's length, width and height before the demolition is priced, and if it comes near the threshold, settle the planning position first.
How do we know whether our Kew house is in a conservation area?
Check the address with Richmond before external structural work is drawn. There are currently 85 conservation areas in the borough, and Kew Green Conservation Area number 2 was designated on 14.01.1969. Being inside one changes what needs permission, including side extensions, two storey rear extensions and larger demolitions. In an unlisted house, internal alterations such as new beams and replacement joists are building control matters either way.
Would lowering the cellar floor of a Kew house count as basement work?
Treat it as basement work until Richmond confirms otherwise. Richmond's Article 4 Directions on basements and subterranean developments cover the whole of the borough, and if the house is listed or a Building of Townscape Merit, Richmond requires a Structural Impact Assessment or Report for basement works. Lowering a cellar also undermines the walls around it, so the structural engineer we appoint designs the underpinning before any digging, whatever the planning answer.
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