Builders in Streatham

Streatham stretches along one of London's longest high streets, and the residential roads running off it contain some of South London's best-value family homes. Large Edwardian semi-detached houses with generous rear gardens are the signature property type, and they lend themselves to a wide range of building projects.

Loft conversions are enormously popular in Streatham. The steep-pitched Edwardian roofs provide excellent headroom for dormer conversions, typically creating a double bedroom with en-suite bathroom. Many properties on Streatham's wider streets can accommodate hip-to-gable conversions that maximise usable space.

Rear extensions are the other staple project. Streatham's long rear gardens mean that single-storey extensions can be generous without overwhelming the plot. Kitchen-diner extensions with bifold doors opening onto the garden are the most requested design, and most fall within permitted development limits.

The Streatham Lodge and Streatham Common conservation areas impose some restrictions, but the majority of Streatham's residential streets are outside conservation zones, making the planning process more straightforward. Lambeth Council has clear design guidance for extensions that builders should follow.

Streatham's housing stock is generally well-built, with solid Edwardian construction that can support additional loads without major structural intervention. However, many properties have been modified over the decades — look out for removed chimney breasts without adequate support, amateur loft conversions, and outdated electrical installations.

Build costs in Streatham are moderate by South London standards, making it possible to achieve good-quality results within reasonable budgets. The area's improving amenities and transport links — including the potential Crossrail 2 station — make renovation a smart investment.

Content verified by the South London Trades editorial team — last updated March 2026