Use Case · Living
A garden room that outlives the house: earth-sheltered, insulated as standard and built for a century of use. From above, lawn and planting. Inside, a vaulted room flooded with daylight.
ASSET: garden-room-exterior.jpg — finalThe Fast Truth
Ask a typical garden room supplier what insulation costs extra, then read their spec sheet's small print. Ours is simpler: vaulted concrete wrapped in earth, geomembrane waterproofing, triple-glazed wooden doors and windows and underfloor heating, on every build, at the listed from-price. An insulated garden room is not our premium tier — it is the only thing we make.
The Comparison
| Underground garden room | House extension | |
|---|---|---|
| Disruption | Garden works only; you stay in the house untouched | Months of builders through the kitchen |
| Timeline | Install in days once consented; ~26 weeks end to end | Commonly 9–18 months design to finish |
| Planning | Often permitted development; consent handled by us when needed | Almost always needs full consent, managed by you |
| Cost certainty | Turnkey from-price; site variables settled before contract | Overruns are the norm, not the exception |
| Garden | Kept — the room hides under it | Lost to footprint |
Ranges
Small Living 10–29m² from £45,000 · Medium Living 30–40m² from £99,000 · Large Living 60–80m² from £199,000. Full detail on the pricing page.
The Rules
Usually not — most garden rooms fall within permitted development. The exceptions, sizes and height rules are in the planning guide, and when consent is needed, we handle it.
FAQ
A permanent insulated structure with a 25-year warranty is an asset, not a depreciating outbuilding. Agents typically treat quality garden rooms as adding usable square-metreage.
Sleeping accommodation changes the planning position — it becomes ancillary residential use. Our annexe page and planning guide cover exactly when that is straightforward.
If a timber cabin would do, buy a timber cabin. Ours are for people who want a room that performs like the house and outlives it.
More questions? See the full FAQ.
Book a scoping call, or download the brochure and browse every design first.
The full price list, what's included module by module, and the process from first call to handover.
