Garden Dome vs Garden Room: Which Is Right?
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Quick answer
For most people, a garden dome: it wins on light, speed, cost and flexibility, while a built garden room wins on insulation, permanence and lockable security. If you want a beautiful, year-round space without a five-figure budget or a building project, choose a dome; Ultra is our pick for most gardens. If you need a locked, fully insulated room and budget is no object, a built garden room is the better fit.
The quick verdict
| Garden dome | Built garden room | |
|---|---|---|
| Cost | From £899 | Often £15,000-£40,000+ |
| Time to install | An afternoon or a day (Mini and Standard 4-6 hours, Large 8-12) | Weeks of building work |
| Foundations | No footings: sits on a firm, level base | Usually concrete footings |
| Planning | Usually permitted development for home use (check locally) | Often permitted development, sometimes not |
| Natural light | Exceptional: clear all round | Limited to windows |
| Insulation | Lower: a clear shell, warmed with a heater | Higher, fully insulated |
| Lockable security | Not as standard | Yes, typically |
| Reversible / movable | Yes: dismantles and moves | No: you leave it behind |
| Wow factor | High: distinctive, panoramic | Conventional |
Where the dome pulls ahead
- Light. This is the big one. A garden room has walls and a few windows; a dome is essentially made of clear panels, so it floods with daylight and keeps the garden in view from every seat. For most people that openness is the whole point.
- Cost and speed. A dome from £899 against a built room running well into five figures isn't a close financial call, and it goes up in an afternoon or a day rather than weeks of building work, mess and trades: individually numbered panels, bolted together with no specialist tools. If you'd rather not build it yourself, our Built for you installation service builds and anchors it.
- Flexibility. No concrete footings, and it can be dismantled and taken with you if you move; a built room is permanent and stays behind. For home use a dome is usually permitted development, but check with your local planning authority, especially for listed buildings, conservation areas and spots near the boundary (rules differ in Scotland, Wales and Northern Ireland). Our planning guide has the detail.
- Character. A glowing dome is a feature; a timber box, however nice, is a box.
Where a built garden room makes sense
It's only fair to say when the heavier option is right. If you need maximum insulation for an all-day, all-year office regardless of running costs, a lockable, alarmed space to store valuable equipment overnight, or a structure that reads as a permanent extension of the house, a built garden room does those things a dome doesn't. A dome is a comfortable, weatherproof, year-round space, but it isn't a sealed, lockable mini-building: the sliding door doesn't lock as standard, so where lockable storage matters, the garden room wins, and it's honest to say so.
How to decide
Ask what you actually want from the space. If it's light, a view, a striking feature, year-round use and value, it's a dome, every time. If it's a locked, fully insulated permanent room and budget is no object, it's a built garden room. Many people assume they need the expensive option and discover a dome gives them everything they were really after for a fraction of the cost and effort. For the dome route, Ultra is the year-round sweet spot and our pick for most gardens, with Extreme as our premium 3 mm option for home or hospitality buyers who want the strongest specification, including on exposed, coastal or high sites; see Original vs Ultra vs Extreme to compare all three.
Frequently asked questions
Does a garden dome cost less than a garden room?
Considerably. A GeoDomeX dome starts from £899, while a built garden room typically costs £15,000-£40,000+, and a dome needs no footings or building work.
Is a dome as warm as an insulated garden room?
No. A built garden room is insulated, while a dome is a clear polycarbonate shell that relies on a heater in cold weather. With a heater it's comfortable year-round, but it isn't a fully insulated, sealed building.
Can I lock a garden dome like a garden room?
No. The sliding door doesn't lock as standard, so it isn't the place to leave valuables overnight. A dome is a comfortable space to use, not a secure store; if you need lockable storage, a garden room wins.
Which has more natural light?
The dome, by a wide margin: clear panels all round versus a few windows in a walled room.
Can I move a dome later?
Yes. It dismantles and reassembles, so you can reposition it or take it with you when you move. A built garden room stays put.