What is the cost in 2026 for a house extension in Sidcup?

The cost in 2026 for a house extension in Sidcup typically ranges from £1,300 to £2,500 per square metre. Factors influencing the price include the complexity of the design, materials used, and local labour rates. For a standard 20 square metre extension, homeowners can expect to pay between £26,000 and £50,000.

Additionally, if you are considering a loft conversion or garage conversion, these projects tend to cost around £35,000 to £65,000 and £15,000 to £30,000, respectively. It’s essential to ensure that your builder is accredited, with certifications such as NICEIC for electrical work and Gas Safe for any gas installations. These credentials are crucial for ensuring the safety and quality of the work performed.

In Sidcup, finding a reliable local builder who understands the local building regulations and planning permissions is vital.

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