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PIR board at £12–£30 per m² is the workhorse of year-round garden rooms — around 70mm meets the current Building Regs benchmark, 100mm is the value sweet spot. Where the heat actually escapes, the retrofit order that pays, and when 50mm EPS is quietly not enough.

What UK research actually shows about garden rooms and property value in 2026, plus a practical checklist of what to verify before signing with a builder.

The main garden room foundation options, how ground screws differ from a concrete base, and what determines which suits a particular garden.

The real construction difference between a log cabin and an insulated garden room, what U-values actually mean for comfort, and which suits which use.

Why planning permission and Building Regulations are two separate things for a garden room, and what England's 15m² and 30m² thresholds actually mean.

The permitted development rules that let most English garden rooms skip planning permission — height limits, the 50% garden rule, and where it stops applying.

Typical UK garden room costs by size and build type in 2026, what drives the price per square metre, and how long the whole process takes.