Structural Alterations Kennington

GS Renovation carries out structural alterations throughout Kennington, from forming new openings to replacing tired joists and underpinning settled floors. Working in SE11's Georgian and Regency houses and its post-war blocks, backed by our founder's 30+ years on the tools, we handle the interventions these older Lambeth homes often need, all engineer-designed and signed off by building control.

In Kennington, 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 Kennington.

How the job runs

1. Free site survey at your Kennington address and an itemised quote.
2. The engineer we appoint designs the work, and it is registered with Lambeth Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
3. Props and any trial holes first, then the opening, joists or underpinning in the engineer's sequence.
4. Building control inspects each stage before it is covered, then issues the completion certificate.

Common structural work in Kennington homes

Two centuries of use leave their mark on Kennington's period houses. Typical structural work at SE11 addresses is to form supported openings between rooms, replace floor joists weakened by old notching or damp, insert steel to carry a widened doorway, or underpin foundations that have settled. Each intervention is different, so we begin with a structural engineer assessing what the existing structure is doing and what any change will demand of it.

Supported openings and replacement joists rely on correctly sized steel bearing onto padstones, temporary propping while the load is transferred, and staged demolition so nothing is left hanging. Underpinning proceeds in controlled bays so the house is never undermined all at once. In tall Georgian townhouses along Kennington Road and around Cleaver Square, this measured approach keeps the fabric stable while we make the alteration you actually need.

Housing in Kennington

Kennington counts roughly 8,500 homes for Council Tax; 28% are older than 1919, 12% interwar and 60% post-war, with 82% flats and 18% houses. Structural repair to a block in Kennington usually falls to the freeholder, which matters here because most homes are flats.

Lower ground floors, pavement vaults and Lambeth's basement rules in Kennington

Owners of Kennington houses with a lower ground floor often want more headroom, and the obvious answer is to dig the floor down. The Lambeth Local Plan basement development policy says basement accommodation beneath existing residential buildings should not result in more than one storey of basement below ground level. A Kennington lower ground floor is often already partly below the street, so lowering it can take the house to the edge of that limit. Establish with the designer how the existing level is counted before an engineer designs any underpinning.

Lambeth also says applicants for basement proposals should submit a Stage 1 (Screening) Basement Impact Assessment undertaken by a qualified professional. For a house with vaults running out under the pavement, raise the vaults with whoever carries out the screening, since they are part of the ground the work will affect. Commission it first. It is far cheaper to learn at screening that a scheme needs a fuller assessment than to find out after the underpinning has been priced and the neighbours have been told.

Consents and ground conditions in SE11

The ground under Kennington varies, with river-terrace gravels over London Clay in many streets, so the cause of cracking or movement is never assumed. Underpinning and new foundations here are always designed by an engineer to suit what a trial hole finds, and Lambeth Council's building control inspects the works as they go. Internal structural alterations need Building Regulations approval rather than planning permission, unless the house is listed, when listed building consent is needed for internal work too.

Where an alteration touches the shared party wall between your house and the neighbour's, the Party Wall Act applies and you serve notice before starting. Because so many SE11 homes are listed or fall within a conservation area, we keep alterations internal wherever possible; anything affecting the exterior, or inside a listed home, would need separate consent, and we will tell you plainly when that line is reached rather than pressing ahead.

• Structural engineer appointed and coordinated for the design
• Party wall process explained, and work built to the award
• Steel beam and RSJ installation

VOA Council Tax stock of properties, March 2025, for Lambeth Walk & North Kennington and Oval. Counts rounded by the VOA.

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Trusted Structural Alterations in Kennington

Kennington owners rely on GS Renovation because structural alterations in period homes reward experience. One team manages the engineer we appoint, Lambeth building control and the works themselves, from supported openings to underpinning. We work tidily around your household and stand behind every SE11 job with our founder's 30+ years on the tools.

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.