Garden Dome vs Greenhouse: What's the Difference?
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Quick answer
A greenhouse is designed to grow plants; a garden dome is designed as a year-round room for people. A dome can hold plants beautifully, but a greenhouse makes a poor room, so the right choice comes down to whether it's for plants or for people. If you want somewhere to sit, dine, work or relax (with room for plants too), the dome is the one. If it's purely a plant nursery, a greenhouse may do.
Different purposes, different builds
People sometimes lump the two together because both are see-through garden structures, but they're built for different jobs. A greenhouse is optimised for horticulture: maximum light transmission, simple glazing (often thin glass or basic polycarbonate), and venting to manage heat for plants. Comfort, durability against impact and looks for human use aren't priorities, which is why a greenhouse is rarely somewhere you'd want to spend an evening. A garden dome is the opposite: it's engineered as a robust, comfortable, striking space for people, using solid, UV-protected polycarbonate with serious impact strength and weather resistance, a solid sliding door, windows and roof vents for ventilation, and a free LED lighting kit. It just happens to be wonderful for plants as well.
Side by side
| Greenhouse | Garden dome | |
|---|---|---|
| Designed for | Growing plants | People: relaxing, dining, working |
| Glazing | Often thin glass or basic panels | Solid, UV-protected polycarbonate |
| Comfort as a room | Low | High: a genuine year-round space |
| Durability | Fragile (glass) or flimsy | Tough: flexes rather than shatters, engineered for strength in wind and snow when anchored |
| Looks | Functional | Striking, architectural |
| Holds plants | Yes (its job) | Yes, easily |
| A place to relax | Not really | Absolutely |
Why a dome suits "a room that also grows things"
A lot of people who think they want a greenhouse actually want a garden room with plants in it: somewhere to pot up seedlings and also sit with a coffee among the greenery. A dome does that brilliantly. The abundant light keeps plants happy, while the comfortable, weatherproof, well-lit space means you can actually enjoy being in there year-round. You get the indoor-garden feel of an orangery or conservatory at a fraction of the cost, with none of a greenhouse's fragility.
Ventilation matters for plants and people alike. Use the roof vents, windows and door to manage heat and humidity: open them up on warm, sunny days so the dome doesn't overheat, and air it regularly to keep condensation and mould at bay. Our guide to the best garden dome for plants and growing covers shading, airflow and keeping frost off in winter.
For dedicated, large-scale growing (rows of tomatoes, serious propagation), a purpose-built greenhouse or polytunnel is the specialist tool, as our garden dome vs polytunnel comparison explains. But for the blend of plants and pleasure most gardens want, a dome is the nicer place to be.
Durability worth noting
One practical point: greenhouses are famously vulnerable. Glass panes crack in a gale or under a stray football, and cheap plastic ones degrade fast. As a material, polycarbonate has around 250 times the impact resistance of glass and flexes rather than shatters, and our panels are UV-protected. The geodesic shape spreads wind and snow loads across the whole frame, so an anchored dome is engineered for strength in wind and snow, with Ultra or Extreme for exposed, coastal or high gardens. It's a structure that lasts, where a greenhouse is something you're forever repairing.
Frequently asked questions
What's the difference between a garden dome and a greenhouse?
A greenhouse is built to grow plants; a dome is built as a comfortable year-round room for people. A dome holds plants well, but a greenhouse isn't a pleasant space to use.
Can you grow plants in a garden dome?
Yes. The abundant natural light suits plants, and you get a comfortable space to enjoy them too, like an orangery for a fraction of the cost. Open the roof vents and windows on warm days to manage heat and humidity.
Is a dome tougher than a greenhouse?
Much. As a material, solid polycarbonate has around 250 times the impact resistance of glass and flexes rather than shatters, and an anchored dome is engineered for strength in wind and snow, where greenhouse glass cracks easily.
Should I buy a greenhouse or a dome?
For dedicated large-scale growing, a greenhouse or polytunnel. For a beautiful room you can also grow and relax in, a dome.
Can I use a dome as a year-round garden room?
Yes. That's exactly what it's designed for: comfortable in all seasons with heating and ventilation.
Sources: polycarbonate material data from A&C Plastics, Piedmont Plastics and KASTLITE.