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    Cheapest Garden Rooms in the UK (Under £15,000)

    Insulated garden rooms start around £8,000–£15,000 fully installed in 2026. Below that, you're looking at uninsulated summer houses or DIY kits.

    What you get under £15,000

    Expect 6–10m², timber-frame construction with 70–100mm insulation, double glazing, basic electrics and standard composite cladding. Foundations are usually adjustable steel screw piles to keep groundworks costs down.

    How to keep costs down

    Choose stock sizes, opt for composite cladding, install electrics yourself with a Part-P certified electrician, and skip plumbing. Buy in late autumn for off-season discounts.

    FAQs

    Are budget garden rooms warm in winter?

    Yes if properly insulated (100mm minimum), with double glazing and a 1–2kW electric heater. Avoid kit builds with under 70mm insulation.

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    Use the cost estimator to see what your specific build would cost, based on your size and spec.