Structural Alterations Slough
Structural alterations, new openings, underpinning and floor structures in Slough, 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
Structural alterations covers the work that changes how a house carries itself: new openings, beams, piers, removed chimney breasts and the foundations under any of it. We appoint and coordinate structural engineers, build to their calculations, and coordinate the building control application and inspections. We never produce structural calculations. This page sets out the Slough specifics that decide what you can do and who has to agree it.
For Slough, on London-derived ranges a simple new opening starts from £1,500, and underpinning a single elevation typically costs £6,000 to £21,000; Berkshire work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Slough.
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. Berkshire 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 Slough address and an itemised quote.
- The engineer we appoint designs the work, and it is registered with Slough Borough 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.
Which documents your alteration is judged against in Slough
Slough's adopted development plan is made up of the Core Strategy, the Site Allocations Development Plan Document, the saved policies of the 2004 Local Plan, the Minerals and Waste Local Plan policies and the Proposals Map. That is five documents rather than one, which is why a short question can take more than one reference to answer.
The Core Strategy was adopted by Full Council on 16 December 2008 and runs from 2006 to 2026. Core Policy 9 refuses development unless it respects the character and distinctiveness of existing buildings, townscapes and landscapes and their local designations. Where an alteration shows on the outside of the house, that is the policy your design has to answer.
Housing in Slough
Slough counts roughly 57,360 homes for Council Tax; 5% are older than 1919, 20% interwar and 73% post-war, with 37% flats and 63% houses. 34% of homes here are terraced; underpinning the party wall of a terrace in Slough needs a notice to the neighbour.
Five conservation areas, and what demolition needs inside them
Slough Borough Council has five conservation areas in the whole borough: Upton Park and Upton Village, Colnbrook, Sussex Place and Clifton Road, St Bernard's School, and St Mary's Church, Langley. Outside those boundaries the conservation area rules do not apply to your house at all.
Inside one of them, demolishing a building with a volume of greater than 115 cubic metres needs planning permission for relevant demolition in a conservation area, the route that replaced the old separate demolition consent in 2013. That is a demolition threshold rather than an alteration threshold, but it is worth knowing before an outbuilding or a rear addition goes into the scope. Check the boundary first, because it decides which set of questions you are answering.
The ground under central Slough is two different things
British Geological Survey 1:50 000 mapping shows Slough town centre straddling two superficial deposits: the Langley Silt Member, clay and silt, and the Taplow Gravel Member, sand and gravel. Both sit over Lambeth Group clay, silt and sand bedrock. Two houses on nearby streets can therefore be founded in different material.
The BGS defines the base of the Langley Silt as a sharp boundary resting on the sand and gravel of the river terrace deposits beneath. Where an alteration adds a new pier, a pad or an underpinned bearing, what lies under that point is a question for a trial hole rather than an assumption. We dig, record, and pass the result to the structural engineer.
Party wall duties sit alongside the council's consents
Slough Borough Council states that applicants are required to comply with the Party Wall Act and other civil laws. It states that notice must be served on the neighbouring occupier if any encroachment beyond the curtilage of the application site is proposed. That duty is separate from planning and from building regulations.
We are a contractor and not a party wall surveyor, so we do not serve notices and we do not act for either side. You serve them as building owner, or your surveyor does. What we do is flag at survey where the work touches a shared wall or a boundary, supply the drawings the notice needs, and build to any award, so there is time to appoint someone before the programme starts to depend on it.
- Chimney breast removal and support to the stack above
- Load paths carried down to foundations on new piers and pads
- Lintel replacement and repair over failed openings
VOA Council Tax stock of properties, March 2025, for all 15 statistical areas in Slough. Counts rounded by the VOA.
Why Choose GS Renovation in Slough
Slough Borough Council is both the planning authority and its own building control service, so the same council sits behind both consents while they run on separate tracks. We keep them separate on paper as well. The engineer's calculations, the building control route and the inspection dates are set out in writing before anything is cut. We appoint and coordinate structural engineers and build to their calculations, and we never produce those calculations ourselves. GS Renovation Ltd is fully insured and registered in England, company number 14611254, and rated 4.9 from 31 reviews on MyBuilder. Quotations are free and carry no obligation.
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FAQ
Frequently Asked Questions about Structural Alterations Slough
How much should a Slough homeowner set aside for structural alterations?
The right sum to set aside for structural alterations in Slough is fixed after the survey, not before it, and usually falls within £1,500 to £21,000 or more, from a simple opening to underpinning one elevation (London-derived). Guessing usually means guessing wrong, and the SL1 visit costs nothing. GS Renovation then gives an itemised total including an engineer's design approved before the work starts. Call 07472 424 226 or email info@gsrenovationltd.co.uk.
Does a neighbour's side window limit an alteration built up to the boundary?
It can. Where a neighbouring house has an original flank wall habitable room window that is its only or major source of light, Slough requires a 45 degree vertical plane to be maintained. That plane is measured from the bottom of the window just above sill level, for the full width of the window. So the height of what you build alongside is set by their window, not by your boundary line.
What does the council actually assess when an alteration shows on the street?
Policy H15 permits an extension only where all of its criteria are met. Two of them concern the neighbours and the street: no significant adverse impact on the amenity of adjoining occupiers, and respect for existing building lines. A third asks for a high quality of design, using materials in keeping with both the existing property and the identifiable character of the surrounding area. Parking arrangements and rear garden amenity space complete the list.
Is the new Slough Local Plan going to change what you can build?
Not yet. Slough Borough Council is preparing a new Local Plan covering 2025 to 2045, recorded at Regulation 18 stage on the national local plan register. It confirmed in December 2025 that the plan would be prepared under the new plan making system. Until it is adopted, your alteration is judged against the adopted plan, which includes the Site Allocations document adopted at Full Council on 30 November 2010.
Is a detached garage exempt from building regulations if you alter it?
Slough Borough Council lists a detached garage as exempt on three conditions. It must contain no sleeping accommodation, have a floor area not exceeding 30 square metres, and sit at least 1 metre from any boundary or else be substantially built of non-combustible materials. Alterations that add sleeping accommodation, or push the floor area past 30 square metres, take the building out of exempt work and into an application.
Your house is on London Road. Does that restrict what you can alter?
It might, because parts of Burnham Lane, Langley Road, London Road and Upton Court Road are designated Residential Areas of Exceptional Character under Policy H12 of the 2004 Local Plan. The individual house numbers are listed in the policy, so check whether yours is among them. Inside a designation, Policy H12 refuses development which would harm the character and amenity of the area, including extensions which would change the scale and nature of the property.
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