Structural Alterations Richmond
Structural alterations, new openings, underpinning and floor structures in Richmond upon Thames, 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 across Richmond upon Thames, from new openings in Kew's period homes to replacement joists and supported openings in the riverside townhouses of TW1 and TW9. We build each change to the design of the structural engineer we appoint, propping and installing it ourselves, and building control inspects and certifies it under the Building Regulations.
In Richmond upon Thames, 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 Richmond upon Thames.
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 Richmond upon Thames 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 Richmond period homes
Richmond's Georgian and Victorian houses were built for a different way of living, and altering them takes care. Whether you want a wide opening between two reception rooms, replacement joists where old timbers have sagged, or a supported opening for new bifold doors at the rear, every change starts with a structural engineer establishing the loads and specifying the steel or timber to carry them.
Older properties near the Thames in TW10 can also need underpinning where foundations were laid shallow or ground has moved over the decades. We excavate and pour in sequenced bays so the house is never undermined, and we tie any new structure into the existing fabric properly. On listed frontages we keep interventions reversible and sympathetic to the original build wherever the design allows.
Housing in Richmond upon Thames
The Council Tax list puts Richmond upon Thames at about 85,810 homes, 42% flats against 58% houses; 38% went up before 1919, 24% between the wars and 37% after 1945. Underpinning the party wall of a terrace in Richmond upon Thames needs a notice to the neighbour, and 29% of homes here are terraced.
Structural work below ground in Richmond upon Thames gardens
Structural alterations that go down rather than out, such as a cellar extended under the garden or a new lower room beside the house, meet a specific set of Richmond upon Thames rules. Every such scheme needs planning permission first, because Richmond's Article 4 Directions on basements together cover the whole of the borough. The Local Plan basement policy limits basements to no more than 50% of the existing garden land and no more than half of any other undeveloped garden area. It also requires at least 1 metre of naturally draining permeable soil above any basement beneath the garden, with a minimum 200mm drainage layer. Those two requirements shape the structure directly: the roof slab has to carry a metre of wet soil plus the drainage build up, which means heavier steel or concrete and a deeper dig than the room height alone suggests.
The house above matters as much as the garden. Richmond requires a Structural Impact Assessment or Report for basement works on listed buildings and buildings of townscape merit, and a Building of Townscape Merit is a locally listed building that is not statutorily listed. Owners of a locally listed house are sometimes surprised to find it grouped with listed ones for this purpose. Check the status before the structural engineer we appoint starts design, because the assessment sets how the existing walls are held up during excavation, rather than being a report added at the end.
Engineered, inspected and signed off across Richmond
Every load-bearing alteration is notifiable to building control under the Building Regulations. The structural engineer we appoint prepares the calculations; we submit them to Richmond Council's building control, agree the details and book inspections at the key stages so the work is witnessed and signed off. New openings get correctly sized lintels or beams on padstones; supported openings are propped and staged so nothing above is ever left unsupported.
Where an alteration touches a shared party wall, common in the borough's terraces and semis across TW2 and SW13, the Party Wall Act applies and you serve notice on the neighbour first. If your home is listed, internal structural work needs listed building consent as well as external work; in a conservation area, only changes to the outside can need planning permission. You get one accountable team managing engineer, consents, build and certificate together.
- Building control applications, inspections and the completion certificate
- Drainage diversion and build-over agreements where required
- Load paths carried down to foundations on new piers and pads
VOA Council Tax stock of properties, March 2025, for all 23 statistical areas in Richmond upon Thames. Counts rounded by the VOA.
Why Choose GS Renovation in Richmond upon Thames
Homeowners across Richmond trust GS Renovation for structural alterations because we cover the whole chain: engineer's design, party wall or listed-building checks, safe propping and staged build, and building control sign-off. Our founder's 30+ years on the tools mean we understand how these buildings behave and how to alter them without surprises.
We loved working with George and Ibrahim and would highly recommend them. They have done splendid job on our new kitchen refurb which including new…
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…
FAQ
Frequently Asked Questions about Structural Alterations Richmond upon Thames
Does the cost of structural alterations rise in a Georgian and early Victorian Richmond upon Thames property?
Age affects the cost of structural alterations in Richmond upon Thames less than people fear; the structural part is broadly similar, within £1,500 to £21,000 or more, from a simple opening to underpinning one elevation (indicative). What differs in Georgian and early Victorian housing is making good cornice, floors and plaster around the TW9 works, priced as separate lines. The sequence also holds: the engineer's design is issued before the building control application.
Can you underpin a period house near the river in Richmond?
Yes. Riverside and older Richmond homes in TW10 sometimes need underpinning where foundations are shallow or ground conditions have shifted. We work to a structural engineer's design, excavate and pour in short sequenced bays so the house stays supported throughout, and have building control inspect and certify the work. On listed properties we agree the approach with any required consent first.
Does structural work inside a listed Richmond house need extra consent?
Yes. Once a house is on the list, knocking through or re-supporting anything inside it requires listed building consent from Richmond Council, applied for on its own track and in addition to building regulations; planning permission is not the relevant test. The list protects interiors too, so expect the conservation officer to ask what historic fabric disappears. Apply before the engineer's drawings are final, as the officer's view can move or narrow the opening.
What is usually found above old openings in a Georgian or Victorian Richmond house?
Often a timber lintel or bressummer built into the brickwork, which may have rotted where damp reached it or sagged under decades of load. When an opening is widened or altered, that timber is replaced with steel or concrete sized by the engineer, with the brickwork above needled and propped first. Cracks stepping up from an opening corner are the usual clue.
Is removing an upstairs wall in a Richmond townhouse riskier than downstairs?
It can be. In some Georgian houses the upper partitions are trussed timber walls that carry floor or even roof loads across the room, so a wall that looks like a flimsy stud partition may be doing real work. The engineer opens it up before anything is decided. Downstairs walls usually carry the floors above and need steel.
How does a party wall affect structural work in a Richmond terrace?
VOA records 29% of homes in Richmond upon Thames as terraced. Cutting into a shared wall to seat a beam is party structure work, so you give the adjoining owner notice two months or more before starting. They may consent, or dissent, in which case surveyors prepare an award. Serve the notice early, alongside the building control application, so the wait does not hold up the start.
Can underpinning a Richmond house go through building control on a Building Notice?
Sometimes. Richmond suggests the notice route only for very simple work, and underpinning is one of the examples it gives, along with installing a bathroom and re-roofing. A straightforward job to a single wall can go that way. Where the underpinning is part of a larger scheme, or the bays run close to a neighbour's footings, get the design checked in advance through Full Plans, which carries plans, detailed specifications and, if appropriate, structural calculations.
How deep can a new basement go under a Richmond house?
Richmond Local Plan Policy 54 resists basement development of more than one storey below existing ground level at residential properties. A single storey is therefore the limit to design around, and a scheme with a double height lower level or a second level below ground starts against policy. Where the aim is more head height in an existing cellar, the structural answer is to lower the floor within that one storey, with the underpinning and retaining walls designed for that depth only.
Are drawings prepared before Richmond's new Local Plan still safe to submit for a structural scheme?
Check them first. The new Richmond Local Plan and Policies Map was adopted on 7 October 2025, so a scheme designed and advised on before that date was tested against the previous plan. For structural work that needs planning permission, such as a basement or a change to the outside, ask the designer to check the drawings against the adopted policies before submission. Unless the house is on the statutory list of historic buildings, purely internal structural work that needs only building control approval is not assessed against the Local Plan.
Every Service, One Team
More GS Renovation Services in Richmond upon Thames
One team for every GS Renovation service in Richmond upon Thames:
Same Service, Nearby Areas
Structural Alterations Near Richmond upon Thames
We carry out structural alterations across Richmond upon Thames and the surrounding areas. Explore a nearby location:
Ready to Start Your Richmond upon Thames Project?
Free, no-obligation quote for structural alterations in Richmond upon Thames.