Garden room cost UK 2026
A garden room is a fully-insulated, year-round outbuilding — distinct from a summerhouse or shed. UK prices typically range from £15,000 for a basic kit to £45,000+ for a high-spec bespoke build with mains electrics, heating, and quality finishes.
Cost guide ranges
| Size | Standard | Premium | Luxury |
|---|---|---|---|
| 3x3m (9m²) | £10,000–£16,000 | £15,000–£22,000 | £20,000–£30,000 |
| 4x3m (12m²) | £14,000–£22,000 | £20,000–£30,000 | £28,000–£40,000 |
| 5x4m (20m²) | £20,000–£32,000 | £30,000–£42,000 | £40,000–£55,000 |
| 6x4m (24m²) | £25,000–£38,000 | £35,000–£50,000 | £48,000–£65,000 |
| Bespoke / unusual shape | +15–30% on above |
What's typically included
- Concrete or steel-pile base
- Timber frame with breathable membrane
- Insulation (typically 100–150mm rigid foam in walls, more in roof)
- External cladding (cedar, larch, composite or render)
- Aluminium or UPVC double-glazed windows + door
- Internal plasterboard + paint finish
- Standard electrics (4–6 sockets, 2 pendant lights, 1 distribution board)
- Engineered wood or LVT flooring
What's typically NOT included
- Mains water + waste connection (if used as office: not needed; if WC/kitchen: £1,500–£4,000)
- Air-source heat pump or larger heating system (£1,500–£4,500)
- Triple-glazed windows or bi-fold doors (£2,000–£8,000)
- Bespoke joinery / desks / built-ins (£1,500–£6,000+)
- Garden landscaping after install (£1,000–£3,000)
- Planning application if outside permitted development
What drives the price
- Base type — ground-screw piles cheapest (and best for clay/wet ground), concrete pad cheapest if soil is good, full strip foundations most expensive but warranted for larger or 2-storey rooms.
- Cladding — composite cheapest, larch mid-range (silvers nicely), western red cedar premium. Render is rare on garden rooms but possible.
- Glazing percentage — large picture windows or sliding doors add £2,000–£8,000.
- Heating — electric panel heaters cheap; air-con or air-source heat pump more efficient long-term but £2,000+ install.
- Mains supply — running mains electric from house £400–£1,500 depending on distance and trenching.
- Permitted development — mostly fine if <2.5m height, <50% garden coverage, single-storey. Conservation areas + listed properties stricter.
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How we estimated these ranges
This is a guide only. The ranges below are intended for early budgeting and trade benchmarking. They are not a substitute for a site visit or an itemised quote from a qualified tradesperson. Always get a site-specific quote before agreeing work.
What's included in these ranges: typical labour costs, common materials at standard specification, and routine preparation or installation work for a standard project of this type.
What's excluded: unusual access (multi-storey, restricted parking), unforeseen structural issues, specialist design or architect fees, planning and building control application fees, premium or high-end finishes, emergency or out-of-hours work, and regional extremes.
Regional note: London, the South East and remote rural areas can vary significantly from the UK averages shown. London labour rates in particular can run 30–50% higher than national averages on the same scope.
Sources and checks used: publicly available UK trade supplier pricing (2025–2026), common day-rate and labour-duration assumptions used in trade quoting, internal example quote structures from TailoredQuote platform data, and where relevant cross-referenced regional contractor surveys and BCIS-style construction cost data.
Last reviewed: May 2026 by TailoredQuote. Prices in this guide will be reviewed and updated periodically.
Frequently asked questions
Garden rooms are typically 30–50% cheaper than an equivalent-sized extension because they don't tie into the existing building (no underpinning, no party wall, simpler base). They're also faster — 4–8 weeks vs 12–20 for an extension. Trade-off: standalone, so requires a walk to use.
Most fall within permitted development if under 2.5m high (or 4m for pitched roofs not within 2m of a boundary), under 50% of garden coverage, and not in front of the house. Conservation areas and listed properties are stricter.
Yes — most professional services and home-office uses are fine within permitted development. If you need customers visiting, planning rules apply. Check with your local authority.
4–8 weeks for a kit-built room, 8–12 weeks for a fully bespoke build. Plus 1–2 weeks for the base.
Related cost guides
Last reviewed: May 2026
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