Structural Alterations Peckham
Structural alterations, new openings, underpinning and floor structures in Peckham, 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 Peckham, from new openings in the terraces near Peckham Rye to replacement joists and supported openings in period homes towards Bermondsey. We form openings, renew failed timbers and underpin where needed, all engineered and signed off correctly.
In Peckham, 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 Peckham.
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 Peckham address and an itemised quote.
- The engineer we appoint designs the work, and it is registered with Southwark 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 in Peckham homes
The bay-fronted Victorian and Edwardian houses across SE15 throw up a familiar set of structural jobs: a new opening between the front and middle reception, a supported opening into the rear closet wing, joists that have sagged or been notched out over decades, and occasionally underpinning where a corner has settled. Each starts with a structural engineer establishing the loads and designing the fix.
When we form a new opening, the engineer sizes the steel or lintel to the span; we bear it onto padstones and prop the structure above while we cut through in stages. Replacement joists are matched for depth and spacing to carry the floor properly, and underpinning is taken down in sequenced bays so the wall is never undermined all at once. The approach is deliberate because these terraces are unforgiving of shortcuts.
Housing in Peckham
Of the 26,680 homes the valuation list records in Peckham, 36% were built before 1919, 2% between the wars and 56% since 1945; 74% are flats and 26% are houses. Most homes here are flats, and structural repair to a block in Peckham usually falls to the freeholder.
Lowering a Peckham cellar under Southwark's basement rules
Where a Peckham house has a cellar or coal vault, digging it down to make a usable room is a structural alteration with its own rulebook. Southwark's Householder SPD says planning permission is required for all homes to create a new basement or extend an existing one, and that a Basement Impact Assessment (BIA) must be submitted with the application. That brings the structural engineer we appoint in at the very start rather than after planning. The assessment is where the underpinning sequence, groundwater and the effect on the houses either side are first worked through, and planning is decided with it in hand.
The SPD also sets the shape of the room. Basement extensions should not extend under the rear garden beyond 50% of the garden depth from the principal rear wall, and are limited to no more than a single storey below ground. On a narrow Peckham plot those two limits decide the size of the room before any drawing does. Ask early whether the main back wall or the rear of the closet wing counts as the principal rear wall, because the answer moves the line. Only then commission the engineer's underpinning design and the party wall drawings, so neither is redrawn after a planning officer's comments.
Engineering and sign-off across SE15
Every structural alteration in your Peckham home is designed on the engineer's calculations and inspected by Southwark Council's building control under the Building Regulations. That covers the beam sizing, the bearings, the propping sequence and the finished work. It is building control that certifies the job, not planning permission, which internal structural alterations here do not require. If the house is listed, listed building consent is needed for internal alterations too.
Where an opening or underpinning affects the wall you share with the neighbouring house, the Party Wall Act applies and you serve notice as building owner before work begins, using the drawings we supply. On streets running towards Camberwell and Dulwich the party wall is nearly always involved, so we build the notice periods into the programme from day one. You get the engineer appointed, the propping done and the building control certificate arranged by one team.
- Wall plate, joist hanger and restraint strap installation
- Floor structure, joist and beam replacement
- New door and window openings in solid masonry
VOA Council Tax stock of properties, March 2025, for all 6 statistical areas in Peckham. Counts rounded by the VOA.
Why Peckham Homeowners Choose GS Renovation
For structural alterations in Peckham, GS Renovation gives you a single accountable team: calculations from the engineer we appoint, the drawings for any party wall notice you serve on the neighbour, Southwark building control sign-off, safe staged propping and underpinning, and tidy working in an occupied SE15 home. Our founder's 30+ years on the tools means we anticipate what these houses hide.
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 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 Peckham
What should I budget for structural alterations in Peckham?
Budget for structural alterations in Peckham as three amounts inside £1,500 to £21,000 or more, from a simple opening to underpinning one elevation (indicative): the structural element, the finishing trades and the approvals. Approvals belong in the budget wherever the job includes Southwark Council building control sign-off of the permanent support before concealment. GS Renovation lays the SE15 quotation out the same way, so each element can be checked or deferred.
Can you underpin a settled corner and form new openings in the same Peckham project?
Yes. We can combine underpinning with new or supported openings on SE15 terraces, sequencing the work so the structure is supported at every stage. One structural engineer designs the whole scheme, you serve any party wall notices on the neighbour, and Southwark building control inspects and certifies the underpinning and the steelwork together under the Building Regulations.
Can the sagging floors in my Peckham house be fixed without taking the ceilings down?
Sometimes, from above. Lifting floorboards lets a carpenter fix new timbers alongside notched or undersized joists, or add a mid span beam where the engineer calls for one, leaving the ceiling below intact. Where joist ends are rotten in a damp external wall, the bearing has to be rebuilt as well. The engineer's design comes first, and Southwark building control is involved where the work is structural.
Who do I appoint first for a structural alteration in Peckham?
The structural engineer, because every later step needs their drawings. The calculations go with the building control application to Southwark Council, and the same drawings show the party wall surveyor what is happening to a shared wall. Party structure notices must go out at least two months before work, so the engineer's design should be ready early. Only then are fixed prices and start dates realistic.
What changes when structural work is inside a post-war Peckham block?
Concrete, mainly. Many Peckham flats built after 1945 have concrete floors and walls, so openings are cut with saws and drills rather than taken out brick by brick, and the engineer needs to know where the reinforcement runs. The structure is shared with the flats above and below, so the freeholder's written consent is normally required. Building control approval applies as in any house.
How is a new opening formed in the outside wall of a Peckham house?
Under a lintel or steel beam specified by the engineer, installed with the wall above supported. Needles pass through the brickwork above the new opening, props hold them, the bricks are cut out and the lintel is bedded on padstones before the props come away. Southwark building control inspects before the opening is finished. Because it changes the outside, planning should be checked first.
How does Southwark charge building control for a Peckham basement?
Southwark's final fees and charges schedule charges a basement as the extension fee plus an additional sum, rather than as a separate flat rate. The extension fee itself is banded by floor area, starting with a charge for an extension less than 40sqm. So the size of the new room below ground sets the starting band, and the basement element sits on top of it. Take the floor area from the engineer's drawings before asking for the figure, since a small change in footprint can move the band.
Can a Peckham basement reach under the front garden as well as the back?
Only a little. Southwark's Householder SPD says a basement extension should not extend to the front of the property to a depth of more than 30%. On a Peckham terrace with a shallow front garden, that leaves very little room at the front, and any front lightwell has to be designed with the basement from the outset. Measure the front garden from the house wall to the boundary before any scheme is drawn, and have the designer mark the permitted line on the survey.
Does digging a Peckham cellar deeper count as extending a basement?
Treat it as one until Southwark says otherwise. The Householder SPD says planning permission is required for all homes to create a new basement or extend an existing one, and lowering a cellar floor to gain headroom adds volume below ground. Going deeper also takes the dig below the footings of the house and often of next door, which is underpinning. That means an engineer's design, a party wall notice served by you as building owner, and building control inspections of each section before it is concreted.
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