What is the average cost of a house extension in Milton Keynes?

Most house extensions in Milton Keynes cost between £30,000 and £75,000 depending on size, complexity, and specification.

Do I need planning permission for an extension?

Many extensions fall under Permitted Development, but double-storey, larger rear extensions and properties in conservation areas usually require planning permission.

How long does a house extension take to build?

Most single-storey extensions take 8–12 weeks, while double-storey projects take 12–20 weeks.

How Much Does a House Extension Cost in Milton Keynes? (2026 Full Guide)

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