Structural Alterations Leatherhead
Structural alterations, new openings, underpinning and floor structures in Leatherhead, designed by the engineer we appoint and inspected at every stage.
- Rated 4.9 from 31 reviews on MyBuilder
- Guide from £1,500 (London-derived)
- Free site survey, itemised quote
GS Renovation carries out structural alterations in Leatherhead, from a single opening to a whole ground floor rearrangement, building to the structural engineer's calculations. The Leatherhead Conservation Area is recorded on the national Planning Data platform under reference 2736, with a start date of 26 March 1974, and an Article 4 direction applies in part of it. We coordinate building control. Fully insured, with free no obligation quotations.
For Leatherhead, on London-derived ranges a simple new opening starts from £1,500, and underpinning a single elevation typically costs £6,000 to £21,000; Surrey work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Leatherhead.
Price guide
| Work | Indicative 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. Surrey work generally runs below the London figures; your price follows a site visit. Prices checked September 2026. Full breakdown: RSJ & Load-Bearing Walls.
How the job runs
- Free site survey at your Leatherhead address and an itemised quote.
- The engineer we appoint designs the work, and it is registered with Southern Building Control Partnership 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.
The conservation area, and the Article 4 direction inside it
The Leatherhead Conservation Area is recorded on the national Planning Data platform under reference 2736, with a start date of 26 March 1974. Article 4 directions are in force in parts of three of Mole Valley's 26 conservation areas: Leatherhead, Dorking and Brockham. An Article 4 direction removes permitted development rights, so work that would be permitted elsewhere can need an application here.
Mole Valley District Council describes its Article 4 directions as protecting features that contribute to the special interest of streets within a conservation area. Whether your address is caught is a question for the council rather than for us. We check it before quoting for anything that changes a front elevation, so the answer arrives before the scaffold does.
Housing in Leatherhead
On the valuation list Leatherhead counts about 6,970 homes, 44% flats and 56% houses; 14% predate 1919, 16% are interwar and 69% post-war. 19% of homes here are detached; a detached house in Leatherhead has its own footings, so underpinning often involves no neighbour.
Thirty eight listed entries stand inside the conservation area boundary
Thirty eight entries on the National Heritage List for England fall inside the Leatherhead conservation area boundary. Setting aside eight churchyard monuments and the war memorial, 29 listed buildings stand within it. If your house is one of them, listed building consent is a separate matter from planning permission and from building control, and it reaches inside the building as well as outside.
The dates cluster. Of the 38 listed entries inside the conservation area, 23 were listed on 7 September 1951. We are a contractor, not a heritage consultant, so on a listed building we build to consents that are already in place, and we say plainly where something needs an application before it needs a builder.
Pre-application advice from Mole Valley is a paid service
Householder pre-application advice from Mole Valley District Council is a paid, letter based service costing £171.39 including VAT. Where the enquiry needs specialist input from the council's Historic Buildings Officer, there is an additional fee of £257.09. On a constrained address, that written view is worth having before drawings are finalised.
It is not a service we can give you in the council's place. What we can do is tell you when your proposal looks like one where the letter is worth the fee, and hold the structural side steady while you get it. We do not produce structural calculations and we do not act as your planning agent.
The inspections a structural alteration triggers
The Southern Building Control Partnership lists an excavations inspection to confirm foundations have been dug to a satisfactory depth. Where your alteration puts a new pad or a new footing into the ground, that stage is called before anything is poured over it. We make the application and book the visits.
The partnership can be reached on 0330 024 9355 or at theteam@southernbcp.co.uk. You are welcome to speak to it directly, though we coordinate the application and the inspections as part of the job, so there is one point of contact rather than several.
- New door and window openings in solid masonry
- Underpinning and foundation strengthening in sequenced bays
- Temporary works, propping and needling
VOA Council Tax stock of properties, March 2025, for Leatherhead North and Leatherhead South & Ashtead South. Counts rounded by the VOA.
Why Choose GS Renovation in Leatherhead
Structural alterations in Leatherhead run into a consent layer before they run into a builder. The conservation area has a start date of 26 March 1974, an Article 4 direction applies in part of it, and 29 listed buildings stand inside the boundary. We tell you which consents your alteration needs, build to the structural engineer's calculations, and coordinate the building control application and inspections. We are fully insured and quotations are free and carry no obligation.
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…
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George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
FAQ
Frequently Asked Questions about Structural Alterations Leatherhead
What should I budget for structural alterations in Leatherhead?
A Leatherhead budget for structural alterations should sit within £1,500 to £21,000 or more, from a simple opening to underpinning one elevation (London-derived) and add a contingency for what the KT22 survey cannot see. In 1950s to 1980s housing the unknowns sit behind plaster and under floors, so GS Renovation prices what is visible and names the rest. The Southern Building Control Partnership fee belongs in the same budget.
How do you find out whether your street is inside the Leatherhead Article 4 direction?
Ask Mole Valley District Council, because the direction covers part of the conservation area rather than all of it. The planning team can be reached on 01306 885001 or at planning@molevalley.gov.uk. Its answer decides whether a permitted development route exists for your elevation at all. Put the question before drawings are finalised, because it changes what those drawings have to show and which application follows.
A tree is in the way of the scaffolding. Does cutting it back need notice?
Yes, six weeks' notice to Mole Valley District Council before pruning or felling a tree in a conservation area. The notice applies to a trunk more than 75mm in diameter, or more than 100mm where the work improves the growth of other trees, measured at chest height, 1.5m above ground level. No fee is payable. Six weeks can sit on the critical path, so the notice goes in early.
The property is on the High Street. What is under it?
Chalk, with nothing mapped above it. The British Geological Survey maps the bedrock under Leatherhead High Street as chalk and records no superficial deposits over it. That chalk is Cretaceous, while the Thanet Formation, Lambeth Group and London Clay mapped a few hundred metres north are Palaeogene beds lying on top of it. Where an alteration puts a new pad into the ground, the engineer designs for what is found.
Is an alteration to a property on Bridge Street inside a flood zone?
It depends which end of the street. Leatherhead Bridge and the western end of Bridge Street, on and beyond the river crossing, fall within Environment Agency Flood Zone 3. The town centre stretch, east of about the Running Horse, lies outside both Flood Zone 2 and Flood Zone 3. Waterway Road splits the same way, southern end in Flood Zone 3, northern end outside both. Check the address.
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