Acrylic sheet greenhouse glass replacement
Updated: 23 October 2026
A storm has taken a pane out of the greenhouse or the shed, and the aluminium bars are still there with a few clips and some broken glass in the gravel. An acrylic sheet greenhouse glass replacement can fill that opening if you measure in millimetres and accept what 3 mm does in the wind. The three greenhouse-sized sheets in our [acrylic glass pane comparison](/hub/diy-supplies/acrylic-glass-pane) are all stated at 3 mm. Peter F. used amazon.co.uk listings from 19 October 2026 and UK trade notes. We did not fit these panes on a greenhouse.
A storm has taken a pane out of the greenhouse or the shed, and the aluminium bars are still there with a few clips and some broken glass in the gravel.
A storm has taken a pane out of the greenhouse or the shed, and the aluminium bars are still there with a few clips and some broken glass in the gravel. An acrylic sheet greenhouse glass replacement can fill that opening if you measure in millimetres and accept what 3 mm does in the wind. The three greenhouse-sized sheets in our acrylic glass pane comparison are all stated at 3 mm. Peter F. used amazon.co.uk listings from 19 October 2026 and UK trade notes. We did not fit these panes on a greenhouse.
Our top picks
| Badge | Product | Nominal size | Thickness | Amazon rating | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Sheetcuts Sheetcuts acrylic sheet, 610 × 610 mm, 3 mm | 610 × 610 mm | 3 mm | 4.6 (380) | 8.4 | about £13.99 | View offer |
| Alternative |  Sheetcuts Sheetcuts acrylic sheet, 610 × 457 mm, 3 mm | 610 × 457 mm (bullet also says 600 × 600 mm) | 3 mm | 4.6 (110) | 5.8 | about £15.95 | View offer |
 Sheetcuts Sheetcuts acrylic sheet, 600 × 600 mm, 3 mm | 600 × 600 mm | 3 mm | 4.4 (57) | 5.6 | about £15.95 | View offer |
On this page
Measure the rebate before you trust 2 foot
Two foot on a UK greenhouse often means a 610 mm module. Cut My calls 610 × 610 mm the 2 ft size on its 3 mm acrylic window. It is not a promise that your house is 610 mm, and it is not the same as 600 mm. Greenhouse Stores lists a 610 mm pack for named Vitavia and Halls models. That shows 610 mm on some aluminium houses. It does not show that every UK greenhouse is 610 mm, and our set's greenhouse panes are 3 mm, not that 2 mm pack.
Measure the opening between the bars, in millimetres, and note whether clips or a rubber capture the edge. Reviews on the 600 mm Sheetcuts sheet include shortfalls of about 5–10 mm. Perspex's expansion allowance is 5 mm per metre, about 3 mm of movement on a 0.6 m pane, so leave the sheet free in the rebate. If the old pane was glass, wear gloves and clear the shards first.
What 3 mm does on a wall and on a roof
UK sellers do not agree on one greenhouse thickness. Plastic Sheets Direct allows acrylic at 3 mm for panes up to about 600 mm in clips, and steps towards 4 mm when the pane is exposed. Plastics Direct's thickness guide treats about 4 mm as the greenhouse default. The Plastic People set a minimum of 3 mm because their customers found 2 mm too bendy. A supported side wall is the kinder case. A roof is where 3 mm shows its limit.
On the Sheetcuts 610 mm square, UK reviews include sag where the pane meets the neighbouring glass. A pane at about £13.99 can look right in the cart and still dish once it is clipped overhead. If the roof takes hail or has little support, read acrylic vs polycarbonate sheet before you repeat the order. A UV-resistant bullet is a claim, not a weathering test.
The three greenhouse sheets in this comparison
The 610 × 610 mm Sheetcuts pane is the sheet to shortlist when you measured 610 mm on a side. The title and the dimension line agree. Skip it as a roof if the sag reviews describe your house. A Stanley-knife bullet is already disputed in the reviews. Plan a fine saw if you must trim.
The 600 × 600 mm square is also stated at 3 mm, at about £15.95 with 4.4 from 57 ratings. It costs more here than the 610 mm square and has the shortfall reviews. Buy it when the rebate is genuinely 600 mm. Do not order it as a cheaper twin of the 610 mm module. In this capture it is not cheaper.
The third listing is titled 610 × 457 mm at 3 mm, about £15.95, with 4.6 from 110 ratings. A bullet on the same page says 600 × 600 mm. One UK review reports a micrometer reading under 2.5 mm. Use it only if your opening is that rectangle and you will check size and thickness on arrival. The material line says acrylic.
Fitting limits
None of these three listings includes clips, a rubber, or a frame. You reuse the greenhouse's W clips, Z clips, or bar capping. Offer the sheet into the rebate without bending it to make a short pane reach. If it is a few millimetres large, trim it as the how to cut acrylic sheet page describes, with a saw rather than a Stanley knife on 3 mm. If it is short, reorder. Silicone will not stretch a 600 mm sheet across a 10 mm gap.
Wash the new pane with water and a little detergent. Perspex warns against glass cleaner and solvents, which it links to crazing. A qualifying purchase through amazon.co.uk can earn us a commission at no extra cost to you. Prices are the 19 October 2026 capture.
Common questions
Will a 600 mm sheet fit a 610 mm bar?
Buyers of the 600 mm Sheetcuts sheet describe a shortfall of about 5–10 mm and gaps at the rubber, including a pane nearer 605 mm against a 610 mm opening. That miss leaves the clip holding air. Order the size you measured.
Is 3 mm thick enough for a roof?
On a supported side, Plastic Sheets Direct allows 3 mm up to about 600 mm, and The Plastic People use 3 mm as a minimum. On a roof, reviews of the 610 mm Sheetcuts pane report sag. Plastics Direct prefers about 4 mm. If the roof must stay flat, 3 mm in this set is the wrong confidence.
Do I need 4 mm or 5 mm instead?
Stricter UK guides move to 4 mm or more for a roof, a larger span, or an exposed site. This comparison's greenhouse sheets are stated at 3 mm. Pixly's 5 mm sheet is A4, not a greenhouse module. A cutter is the route to a thicker 610 mm pane.
Does the pane include clips or a frame?
No. These Sheetcuts listings are a sheet only. You need the fixings already on the greenhouse, or W or Z clips that match the bar. The sheet price is not a glazing kit.
How much gap do I leave for expansion?
Perspex's rule of thumb is 5 mm per metre, about 3 mm on a 0.6 m pane across a large temperature change. That figure is not a measurement on these listings. Do not jam the sheet, and do not leave a 10 mm miss and call it expansion.
Related pages
Sources
Public UK sources and the amazon.co.uk listings compared on this page. Prices, sizes and stars were read on 19 October 2026.
- Perspex cell cast technical data sheet (2019) (retrieved 19.10.2026)
- Perspex design guide (retrieved 19.10.2026)
- Perspex tolerances via QD Plastics (retrieved 19.10.2026)
- Plastics Direct thickness guide (retrieved 19.10.2026)
- Plastic Sheets Direct greenhouse panels (retrieved 19.10.2026)
- Cut My shed and greenhouse windows (retrieved 19.10.2026)
- Simply Plastics cutting guide (retrieved 19.10.2026)
- London Fire, fire-resisting glazing note (retrieved 19.10.2026)