Polycarbonate Greenhouse Sizes
Polycarbonate greenhouses are shatterproof, light and good at holding heat, which makes them a popular choice for family gardens and windy spots. Below you will find every polycarbonate greenhouse size we compare, from compact 4′ x 2′ lean to greenhouses to 10′ x 32′ growing houses, with links to compare prices from leading UK retailers.
Sizes are given as width x depth in feet. Polycarbonate panels come in single wall, twin wall and multi wall versions, so check the panel type, frame colour and number of vents on each product page as well as the size.
Small polycarbonate greenhouses
Compact and lean to greenhouses for patios, walls and small gardens.
- 4′ x 2′ polycarbonate greenhouses
- 6′ x 2′ polycarbonate greenhouses
- 4′ x 4′ polycarbonate greenhouses
- 6′ x 4′ polycarbonate greenhouses
Medium polycarbonate greenhouses
The most popular sizes, with room for staging, seed trays and taller crops.
- 8′ x 4′ polycarbonate greenhouses
- 6′ x 6′ polycarbonate greenhouses
- 6′ x 8′ polycarbonate greenhouses
- 6′ x 9′ polycarbonate greenhouses
- 6′ x 10′ polycarbonate greenhouses
- 8′ x 8′ polycarbonate greenhouses
- 6′ x 11′ polycarbonate greenhouses
- 6′ x 12′ polycarbonate greenhouses
Large polycarbonate greenhouses
Large growing houses with space for beds, staging and a working area.
- 8′ x 10′ polycarbonate greenhouses
- 6′ x 14′ polycarbonate greenhouses
- 8′ x 12′ polycarbonate greenhouses
- 8′ x 14′ polycarbonate greenhouses
- 10′ x 12′ polycarbonate greenhouses
- 12′ x 10′ polycarbonate greenhouses
- 8′ x 16′ polycarbonate greenhouses
- 8′ x 20′ polycarbonate greenhouses
- 10′ x 16′ polycarbonate greenhouses
- 10′ x 20′ polycarbonate greenhouses
- 10′ x 24′ polycarbonate greenhouses
- 10′ x 28′ polycarbonate greenhouses
- 10′ x 32′ polycarbonate greenhouses
Polycarbonate Greenhouses by brand
Browse all polycarbonate greenhouses
How to choose the right polycarbonate greenhouse size
Single, twin or multi wall panels
Clear single wall polycarbonate lets in the most light. Twin wall and multi wall panels diffuse the light, which reduces scorching, and trap air between the layers to hold heat on cold nights.
Measure the space and the light
Greenhouses need as much sun as possible, so choose the brightest spot in the garden, ideally with the ridge running east to west. Allow room around it to open the door and roof vents and to clean the glazing.
Decide what you will grow
A 6′ x 4′ polycarbonate greenhouse suits seedlings and a few tomato plants. For staging on both sides and taller crops such as cucumbers, look at 6′ x 8′ and above, and for a working greenhouse with a potting bench, 8′ x 10′ or larger.
Plan ventilation
Greenhouses overheat quickly in summer. Look for roof vents, louvre windows or automatic vent openers, and the larger the greenhouse, the more vents it needs.
Prepare a level base
A greenhouse must sit on a firm, level base so the frame stays square and the glazing does not crack or pop out. Many models offer a matching base kit, which is the easiest option.
Polycarbonate Greenhouse size FAQs
Are polycarbonate greenhouses any good?
Yes. Polycarbonate is shatterproof, light and insulates better than single glass, which makes it a safe, practical choice for family gardens and exposed sites.
What size polycarbonate greenhouse should I buy?
6′ x 6′ or 6′ x 8′ suits most gardens, with room for staging on both sides. If you grow a lot from seed or want a potting bench, look at 8′ x 10′ and larger.
How long does polycarbonate last?
UV protected polycarbonate panels typically last many years before they start to yellow. Check the UV protection and guarantee on each product page.
Does a polycarbonate greenhouse need a base?
Yes. Polycarbonate greenhouses are light, so they must sit on a level base and be anchored down to stop them moving in strong winds.
Compare other sizes
Comparing options? See wooden greenhouse sizes and aluminium greenhouse sizes, or browse all polycarbonate greenhouses.