What are the costs for house extensions near me local building Sidcup?

The cost of a house extension in Sidcup typically ranges from £1,200 to £2,000 per square metre in 2026. Prices can vary based on the complexity of the project, materials used, and whether you are adding a single storey or a two-storey extension. For example, a standard single-storey extension might cost around £20,000–£40,000, while a more elaborate two-storey extension could be £40,000–£80,000.

It's important to ensure that your builder is fully certified, ideally with qualifications such as the Federation of Master Builders (FMB) or similar, to guarantee high standards of workmanship. Additionally, check for local authority regulations in Sidcup, which may affect your project's planning permission and building regulations compliance.

Finally, if you're considering other options like loft conversions or garage conversions, these can also provide great value, often costing between £25,000 and £60,000 for lofts.

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