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Ranking live prices across retailers.
Best polycarbonate greenhouses, compared
Polycarbonate-glazed greenhouses from the UK retailers we track, ranked by value and specification with live prices. Twin-wall polycarbonate is near-unbreakable and insulates better than horticultural glass — the practical choice for family gardens and windy sites.
Independent comparison: we may earn a commission when you buy through links on this page. It never affects how we rank products — see our method.
| # | Product | Our rating | Best price | Retailers | Dimensions (cm) | Features |
|---|---|---|---|---|---|---|
| 1 |  6'x4' Palram Canopia Mythos Small Silver Polycarbonate Greenhouse (1.8x1.2m)Top pick Palram Canopia · 2 options | 77 | £280.99 | Buy Sheds Direct, Shedstore | W185 × L126 | rain-guttersroof-ventlockable-door |
| 2 |  6' x 6' Palram Canopia Hybrid Silver Polycarbonate Greenhouse (1.85m x 1.86m) Palram Canopia · 2 options | 75 | £348.99 | Buy Sheds Direct, Shedstore | W185 × L186 | polycarbonateuv-protectedrain-guttersroof-ventlockable-doorrust-resistantwind-resistantsnow-load-tested |
| 3 | 75 | £352.99 | Buy Sheds Direct, Shedstore | W185 × L247 | rain-guttersroof-ventlockable | |
| 4 | 75 | £361.99 | Buy Sheds Direct, Shedstore | W185 × L186 | rain-guttersroof-ventlockable | |
| 5 |  6' x 6' Palram Canopia Hybrid Green Polycarbonate Greenhouse (1.85m x 1.86m) Palram Canopia · 2 options | 75 | £369.99 | Buy Sheds Direct, Shedstore | W185 × L186 | rain-gutterslockable-doorroof-vent |
| 6 | 75 | £376.99 | Buy Sheds Direct, Shedstore | W185 × L126 | rain-guttersventlockable | |
| 7 |  6' x 4' Palram Canopia Harmony Grey Polycarbonate Greenhouse (1.85m x 1.26m) Palram Canopia · 2 options | 75 | £376.99 | Buy Sheds Direct, Shedstore | W126 × L185 | rain-guttersventlockable |
| 8 |  6' x 8' Palram Canopia Hybrid Walk In Silver Polycarbonate Greenhouse (1.85m x 2.47m) Palram Canopia · 2 options | 75 | £379.99 | Buy Sheds Direct, Shedstore | W185 × L247 | walk-inlockable-doorroof-ventgutters |
| 9 | 74 | £390.99 | Buy Sheds Direct, Shedstore | W186 × L185 | gutterslockableroof-venttwin-walluv-protected | |
| 10 | 74 | £404.99 | Buy Sheds Direct, Shedstore | W185 × L306 × H210 | walk-inrain-guttersroof-ventlockable-door | |
| 11 | 74 | £412.99 | Buy Sheds Direct, Shedstore | W185 × L247 | walk-inlockable-doorrain-guttersroof-vent | |
| 12 |  6â x 6â Palram Canopia Harmony Green Polycarbonate Greenhouse (1.85m x 1.86m) Palram Canopia · 3 options | 74 | £421.99 | Buy Sheds Direct, Shedstore | W185 × L186 | lockableguttersvent |
| 13 |  6' x 10' Palram Canopia Hybrid Walk In Grey Polycarbonate Greenhouse (1.85m x 3.06m) Palram Canopia · 2 options | 73 | £464.99 | Buy Sheds Direct, Shedstore | W185 × L306 | lockablerain-guttersroof-vent |
| 14 |  6â x 8â Palram Canopia Harmony Walk In Green Polycarbonate Greenhouse (1.85m x 2.47m) Palram Canopia · 3 options | 72 | £474.99 | Buy Sheds Direct, Shedstore | W185 × L247 | walk-inlockablerain-guttersroof-ventno-floor |
| 15 | 72 | £496.99 | Buy Sheds Direct, Shedstore | W185 × L306 | walk-inlockablerain-guttersroof-vent | |
| 16 | 71 | £528.99 | Buy Sheds Direct, Shedstore | W185 × L370 | lockable-doorrain-guttersroof-ventsuv-protectedrust-resistantshatterproofapex-roof | |
| 17 |  6â x 10â Palram Canopia Harmony Walk In Green Polycarbonate Greenhouse (1.85m x 3.06m) Palram Canopia · 3 options | 71 | £530.99 | Buy Sheds Direct, Shedstore | W185 × L306 | rain-guttersroof-ventlockable-door |
| 18 |  6' x 12' Palram Canopia Hybrid Large Silver Polycarbonate Greenhouse (1.85m x 3.70m) Palram Canopia · 2 options | 71 | £553.99 | Buy Sheds Direct, Shedstore | W185 × L370 | lockableguttersvents |
| 19 | 71 | £553.99 | Buy Sheds Direct, Shedstore | W125 × L244 | side-doorroof-ventguttering | |
| 20 | 70 | £592.99 | Buy Sheds Direct, Shedstore | W185 × L426 | lockablerain-guttersroof-ventswind-resistantsnow-resistant | |
| 21 |  6' x 12' Palram Canopia Hybrid Large Green Polycarbonate Greenhouse (1.85m x 3.70m) Palram Canopia · 2 options | 70 | £596.99 | Buy Sheds Direct, Shedstore | W185 × L370 | lockable-doorrain-guttersroof-ventsuv-protected |
| 22 | 70 | £596.99 | Buy Sheds Direct, Shedstore | W185 × L370 | lockable-doorrain-guttersroof-vents | |
| 23 | 68 | £690.99 | Buy Sheds Direct, Shedstore | W185 × L426 | lockableguttersventsapex-roof | |
| 24 |  6'x8' Halls Aluminium Frame Polycarbonate Greenhouse (1.92x2.56m) Halls · 4 options | 67 | £713.99 | Buy Sheds Direct, Shedstore | W192.8 × L256.8 × H187.9 | sliding-dooropening-roof-ventguttering |
| 25 | 56 | £323.99 | Buy Sheds Direct, Shedstore | W185 × L126 | canopy | |
| 26 | 54 | £1,289 | Buy Sheds Direct, Shedstore | W360 × L300 | walk-inlockable-doorsroof-ventspolycarbonatealuminium-framevictorian-style | |
| 27 | 50 | £1,508.99 | Buy Sheds Direct, Shedstore | W240 × L240 | walk-inguttersroof-ventlouvre-windowlock | |
| 28 |  8'x12' Palram Canopia Glory Grey Large Polycarbonate Greenhouse (2.4x3.6m) Palram Canopia · 3 options | 48 | £1,795.99 | Buy Sheds Direct, Shedstore | W240 × L360 | polycarbonatealuminium-framerust-resistanttwin-wallrain-guttersopening-roof-ventslouvre-windowlockable-doorlow-thresholdreversible-doormaintenance-freeshatterproofuv-protectedweatherproofwind-resistantsnow-load-tested |
| 29 |  6' x 8' Palram Canopia Hybrid Walk In Green Polycarbonate Greenhouse (1.85m x 2.47m) Palram Canopia · 2 options | 48 | £416.99 | Buy Sheds Direct | — | slide |
| 30 |  8â x 12â Palram Canopia Rion Grand Gardener Large Polycarbonate Greenhouse (2.4m x 3.6m) Palram Canopia · 2 options | 38 | £1,932.99 | Buy Sheds Direct, Shedstore | W240 × L360 | double-doorsroof-vents |
| 31 | 38 | £2,736.99 | Buy Sheds Direct, Shedstore | — | double-doorsroof-vents |
Why we rank it this way
Our default rating weights value for money and specification equally, then safety certification and how widely the product is stocked across retailers.
Weights: priceVsBand 30% · spec 30% · safetyCert 20% · availabilityBreadth 20% — full method on how we rank.
FAQs
- Is polycarbonate better than glass for a greenhouse?
- Twin-wall polycarbonate insulates roughly twice as well as single glass, diffuses light (fewer scorched seedlings) and won't shatter. Glass wins on clarity, scratch resistance and staying put in high wind if properly clipped — polycarbonate panels need good fixings.
- How long does polycarbonate glazing last?
- UV-stabilised panels typically carry a 10-year guarantee against yellowing and last comfortably beyond it. Cheap unstabilised sheet clouds within a few summers — check the listing states UV protection.