Structural engineer in Wandsworth

Structural engineering in Wandsworth

Wandsworth runs along the south bank of the Thames from Battersea (SW11) to Putney (SW15), and south through Wandsworth Town and Earlsfield (SW18) to Balham (SW12) and Tooting (SW17). We have worked on 65 projects here since 2019. Its long streets of Victorian and Edwardian terraces make it one of the busiest parts of London for side returns, lofts and basements.

Our Wandsworth work also covers the high streets. In Balham we provided the structural engineering and the full set of planning reports for a basement scheme on a high street building. In Putney we prepared drawings and calculations to confirm whether the floor of a pharmacy could carry a new automated dispensing robot. Our floor loading assessment covers checks like this.

Wandsworth terraces, mansion flats and the Totterdown estate

Between the commons, around Clapham Junction, Northcote Road and Earlsfield, most houses are Victorian and Edwardian terraces with rear outriggers and narrow side returns. Many have already had lofts and extensions, and neighbouring houses are often mirror images, which makes party wall work almost certain. Battersea and Putney also have many mansion block flats.

Tooting has Edwardian terraces and the early council cottage estate at Totterdown Fields, with small houses on tight plots. Putney and Southfields have larger Victorian and Edwardian houses, some converted into flats. Nine Elms and the riverside have newer development, though our work is mainly on the older stock.

Thames gravels, the Wandle and London Clay

In the northern half of Wandsworth, Thames terrace gravels overlie the London Clay, and alluvium is found by the river and along the River Wandle through Wandsworth Town and Earlsfield. Moving south toward Tooting and Balham, and up toward Putney Heath, the clay is often closer to the surface. Conditions change within a few streets, so trial pits matter.

Gravel brings perched water and loose sand into excavations, a key issue for basements. On clay, street plane trees have unsettled many older bays. Parts of the riverside and the Wandle valley lie in flood zones, where a minor development flood risk assessment may be needed for an extension.

Common structural projects in Wandsworth

Wandsworth owners tend to extend in every direction: up into the loft, out into the side return and down into a basement. Our job is to make these work together, so the side return steel frame and the loft steels share load paths and foundations where practical.

• Side return and wraparound extensions
• Rear dormer and L-shaped loft conversions
• Basements under terraced houses
• Knocking through the rear reception rooms
• Floor loading checks for shops and offices
• Planning reports for high street basements

Basements, planning and party walls in Wandsworth

Wandsworth Council has a specific basement policy with supporting guidance, covering the extent of excavation under gardens, protection of neighbouring buildings, drainage, flood risk and construction impacts. Applications usually need structural and hydrological reports. Expect the council to set out its exact requirements at pre-application stage; our basement guide describes the typical sequence.

The borough has many conservation areas, including large areas around the commons. The two-month notice period for party structure work under the Party Wall etc. Act 1996 should be built into your programme.