A 6x6 greenhouse gives you 3.8 square metres of growing space. That is 52% more than a 6x4 for roughly £50 to £100 extra. The additional 640 mm of depth turns a single row of tomatoes into a proper growing setup with staging down one side and plants down the other. We stock aluminium models from Vitavia, Elite, and Palram Canopia, plus timber-framed Swallow greenhouses.
Prices start at £355 for a Palram Canopia Hybrid in polycarbonate. Glass models begin at £449 with the Vitavia Venus 3800. At the top end, the Swallow Kingfisher in ThermoWood costs £2,958 and includes free professional installation. Free UK Mainland Delivery on every order.
A 6x6 greenhouse is the size most growers settle on. It gives you room for staging down one side and a clear standing space on the other. We stock 55 models in this size, starting from £379. The range spans toughened glass, horticultural glass and twin-wall polycarbonate, in silver, green, grey and black frames.
The square footprint is the thing to plan for. Your base must be a true 6ft by 6ft square, level and dead flat, or the frame will not sit right. We fit these every week, so we know where they go wrong. If you want more length for a second bench, look at our 8x6 greenhouses. Tighter on space? The 6x4 greenhouses suit a narrow plot. Add greenhouse staging to make full use of both walls.
Why We Chose This Range
"The 6x6 is the size I point most first-time buyers to. You get staging on one side and room to actually stand and work on the other. A 6x4 always feels cramped once the bench goes in. The 6x6 does not."
— Matt, Founder of Greenhouse Stores💡 Tip: Order your base or base anchor kit with the greenhouse. Retro-fitting one to a built frame is a fiddly half-day job.
Measure both diagonals before you build. On a 6x6 they should match to within a few millimetres. If one diagonal is longer, the base is a parallelogram, not a square. The roof bars will not line up and the door will jam. Fix the base before a single panel goes on.
Best For: A first proper walk-in greenhouse that will not blow over in a gale.
Why I Recommend It: Toughened glass shrugs off knocks and stray footballs. The Venus frame is sturdy for the money, and parts are easy to get years on.
Price: from £549
| Glazing | Best for | From |
|---|---|---|
| Twin-wall polycarbonate | Warmth, safety, exposed gardens | £379 |
| Toughened glass ⭐ Matt's Pick | Clarity plus knock resistance | £549 |
| Horticultural glass | Lowest price, classic look | £449 |
| Wooden frame | A natural finish that lasts | £2,958 |
A flat, level square of 6ft by 6ft. Concrete, paving slabs or a steel base kit all work. Check both diagonals match so the footprint is truly square.
Yes, on most 6x6 models. Many growers run staging down one wall and keep the other side clear for tall plants and grow bags.
Toughened glass for most gardens. It gives clear light and resists knocks. Choose polycarbonate for warmth and safety near children or in windy spots.
Yes, comfortably for a household. You get a bench for seed trays plus floor room for grow bags of tomatoes, cucumbers or peppers.
Yes, always. Bolt the frame to a base or use a ground anchor kit. An unsecured 6x6 can lift and twist in strong wind.
Call our team free on 0800 098 8877
