What are the average costs for a house extension in Lewisham?

In Lewisham, the cost of a house extension typically ranges from £1,200 to £2,000 per square metre in 2026. This means that a standard extension of around 20 square metres could cost between £24,000 and £40,000. The final price will depend on various factors, such as design complexity, materials, and any necessary planning permissions. It's essential to hire professionals who are certified and experienced, ideally those who hold relevant qualifications like NICEIC for electrical work or Gas Safe for any heating requirements.

Additionally, local regulations may affect your project. Make sure you check with Lewisham Council regarding planning permission for your extension. By working with local builders who are familiar with these regulations, you can ensure a smoother process.

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