About Our 6x6 Greenhouses
We carry 47 products in the 6x6 greenhouse size from five manufacturers. Palram Canopia polycarbonate models start at £355 and ship in 3 to 5 days. Vitavia aluminium greenhouses with glass glazing begin at £449. British-made Elite models run from £620 with integral bases and 20-year warranties, rising to £1,429 for the heavy-duty Titan. The Swallow Kingfisher in ThermoWood timber costs £2,958 and that price includes free professional installation.
A 6x6 has 3.8 square metres of floor space. That is 52% more than a 6x4 greenhouse and the extra depth lets you run staging down one side with grow bags on the other. You get a proper central aisle to work in. The price step from a 6x4 to a 6x6 is typically £50 to £100 for the same model.
Why We Chose This Range
"The 6x6 is the size I wish everyone started with. A 6x4 fills up fast once you put staging in and start a few seed trays. The extra 640 mm of depth in a 6x6 is the difference between squeezing past your tomatoes and actually having room to pot up comfortably. The Vitavia Venus 3800 at £449 is the entry point for glass. But if someone tells me they grow tomatoes, I steer them toward the Elite High Eave at £679. The eaves are 293 mm taller than a standard model. Your cordons have room to grow before they hit the roof bars."
— Matt, Founder of Greenhouse StoresTypes of 6x6 Greenhouse We Offer
Budget Polycarbonate (Palram Canopia)
The Hybrid, Harmony, and Mythos use polycarbonate glazing on aluminium frames. Prices from £355. In stock for 3 to 5 day delivery, which is weeks faster than made-to-order models. The Hybrid pairs an opaque roof with clear side panels. Pick the Harmony if you want clear polycarbonate throughout for maximum light. 5-year warranty. A good starting point if you need a greenhouse quickly and cheaply.
Mid-Range Aluminium (Vitavia)
Three models to pick from. The Venus 3800 starts at £449 and is the cheapest glass 6x6 we sell. The Apollo 3800 (from £559) includes its own base plinth and a low-threshold door. The Orion 3800 (from £574) has curved eaves and the tallest door of any Vitavia at 2,000 mm. All three come with a 12-year warranty and free rainwater downpipe kit.
Premium Aluminium (Elite)
Made in Bolton, England. Four models: the Craftsman (from £620), High Eave (from £679), Thyme (£1,299), and Titan (£1,429). All include integral aluminium bases and locking doors. The High Eave has 1,585 mm eaves for tall crops. The Titan is the strongest 6x6 we stock, with double doors and a 10-blade louvre vent. 20-year warranty across every Elite model. 12 colour options.
Premium Timber (Swallow)
The Kingfisher 6x6 is handmade from ThermoWood-treated Scandinavian redwood. No painting or retreatment needed. It has the highest eaves of any 6x6 at 1,730 mm, two automatic roof vents, and a full length of staging included. £2,958 with free professional installation by Swallow's own fitters. Choose natural wood, oiled (+ £445), or painted in 10 colours (+ £883). Allow 8 to 12 weeks.
6x6 Greenhouse Comparison: Key Models at a Glance
| Model | From | Frame | Glazing | Eaves (mm) | Ridge (mm) | Warranty | Best For |
|---|---|---|---|---|---|---|---|
| Palram Hybrid | £355 | Aluminium | Polycarbonate | — | 2,070 | 5 years | Budget buyers, fast delivery |
| Vitavia Venus 3800 | £449 | Aluminium | Glass or poly | 1,240 | 1,970 | 12 years | First greenhouse, best value glass |
| Vitavia Apollo 3800 | £559 | Aluminium | Glass or poly | 1,360 | 2,009 | 12 years | Low-threshold entry, includes base |
| Elite Craftsman | £620 | Aluminium | Glass or poly | 1,292 | 2,122 | 20 years | British-made quality, 12 colours |
| Elite High Eave | £679 | Aluminium | Glass or poly | 1,585 | 2,420 | 20 years | Tomato growers, tall plants |
| Elite Thyme | £1,299 | Aluminium | Toughened glass | 1,585 | 2,420 | 20 years | Victorian styling, double doors |
| Elite Titan 600 | £1,429 | Aluminium | Toughened glass | 1,585 | 2,420 | 20 years | Exposed sites, strongest frame |
| Swallow Kingfisher | £2,958 | ThermoWood | Toughened glass | 1,730 | 2,370 | 12 years | Premium timber, free installation |
Buying Guide: How to Choose the Best 6x6 Greenhouse
💡 Tip: If you are choosing between a 6x4 and a 6x6, go with the 6x6. The extra 640 mm of depth doubles your tomato capacity and only costs £50 to £100 more. Once you add staging, grow bags, and a few pots, a 6x4 has no spare room. A 6x6 gives you a central aisle to work in without stepping on your plants.
🔧 Matt's Installation Tip: Base Preparation for a 6x6
A 6x6 base is roughly 1,930 mm x 1,950 mm for Vitavia models and 1,900 mm x 1,971 mm for Elite models. Check the exact minimum base size listed on your product page before you start building. Paving slabs on 50 mm of compacted sharp sand is our recommended method. Level to within 3 mm corner to corner.
The base must be square. Measure diagonally from corner to corner in both directions. If the two diagonals differ by more than 5 mm, the frame will rack and the door will bind. Read our full paving slab base guide here.
Under £500 gets you a Palram polycarbonate or a Vitavia Venus in horticultural glass. The Vitavia Apollo and Elite Craftsman sit between £550 and £800 and both come with integral bases. Above £1,000, the Elite Titan and Thyme offer the heaviest frames in the range, with the Thyme adding Victorian styling. For timber, the Swallow Kingfisher at £2,958 is the only option and includes installation.
Ventilation is critical in a 6x6. One roof vent is the bare minimum. We recommend adding a louvre side vent if your model does not include one. Both the Elite Titan and Elite Thyme come with louvre vents fitted. Toughened glass costs £100 to £200 more than horticultural but it is four times stronger and shatters safely if hit.
Frequently Asked Questions
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How much does a 6x6 greenhouse cost?
6x6 greenhouses at Greenhouse Stores cost £355 to £2,958. Palram Canopia polycarbonate models start at £355. The cheapest glass option is the Vitavia Venus 3800 at £449. Elite British-made models with integral bases start at £620. The Swallow Kingfisher in ThermoWood timber costs £2,958 including free professional installation. All prices include free UK mainland delivery.
- Is a 6x6 greenhouse big enough?
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What can I grow in a 6x6 greenhouse?
A 6x6 fits 8 to 12 cordon tomatoes comfortably. Plant in grow bags down both sides with a central path. You can also grow 3 to 4 cucumbers trained vertically, 6 to 10 peppers, and salad crops on staging. Use a heated propagator for year-round seed starting. In winter, a 6x6 is small enough to heat cheaply with a tube heater from around £75.
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What is the difference between a 6x6 and a 6x4 greenhouse?
A 6x6 has 52% more floor space than a 6x4. The extra 640 mm of depth doubles your tomato capacity from 4 to 6 plants up to 8 to 12. It also gives you a central aisle between staging and growing areas. The price difference is typically only £50 to £100 for the same model. The 6x6 fits a 6ft x 6ft paving slab base.
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Do I need planning permission for a 6x6 greenhouse?
No, a 6x6 greenhouse falls within permitted development. It is well under the 30 square metre outbuilding limit. The ridge height must stay below 2.5 metres if you build within 2 metres of a boundary. All our 6x6 models meet this requirement. Check with your local authority if you live in a conservation area or near a listed building.
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Which 6x6 greenhouse is best for growing tomatoes?
The Elite High Eave at £679 is our top choice. Its 1,585 mm eaves are 293 mm taller than a standard model. Cordon tomatoes grow up to 1.8 metres tall, so extra eave height stops them crowding the roof glass. The Swallow Kingfisher has even taller eaves at 1,730 mm but costs £2,958. For a budget option, the Vitavia Venus 3800 at £449 works but the 1,240 mm eaves will limit how tall your plants can grow at the sides.
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How long does it take to build a 6x6 greenhouse?
Allow a full weekend for two people. Day one covers the frame assembly. Day two is glazing. Palram polycarbonate models are faster, typically 3 to 4 hours total, because the panels slide into channels. Glass models take longer because each pane must seat into clips. Do not leave a partially glazed frame overnight as wind can damage unsupported bars.