Polytunnel Plastic & Net Replacement Covers

What size of cover do I need?

To calculate the size of polythene or net sheet needed for your replacement polytunnel cover, please enter the information to the right and click 'Calculate'. Please Note: The calculations for our polytunnel covers are based on a polytunnel with a door frame at each end.

Please feel free to contact us on 01282 811250 or by e-mail if you are still unsure as to the size of cover needed.

Alternatively, if you know the size of cover needed or if you would like to buy polytunnel plastic or net by the metre, please see our range of polythene films, netting and polytunnel covers supplies in our Accessories pages.

Replacement Covers

Distance over hoop

Length of Polytunnel

Height of Polytunnel


Please note: calculations are based on a polytunnel with a door frame at both ends.

Thermal Anti Drip Polytunnel Covers

We pride ourselves on offering the very highest quality of Thermal Anti Drip polytunnel covers - the preferred polythene of UK growers. Our polytunnel polythene films are the first in the UK to include NEW 5-layer co-extrusion technology. This innovative system protects against disease and excess moisture, prevents heat loss, enables effective light diffusion and stops dust from gathering.

Choose from the following polytunnel replacement covers: 600 gauge/150 micron polythene film with a 4-year warranty against UV degradation, or a 720 gauge/180 micron polythene film with an extended 5-year warranty.

Net Polytunnel Covers

We're proud to be one of the very best net polytunnel covers suppliers in the UK and are able to produce one-piece sewn net polytunnel covers, which have an impressive 8-10 year lifespan.

This green 47% shade net is ideal to be used on a polytunnel with or without a polythene cover in place. Used on its own a net cover provides shade, full ventilation, significant reduction in wind speeds, and still allows rainwater to filter through to the plants. It also provides excellent crop protection from birds and insects.

Placed over a polytunnel plastic, the net provides shade and significantly reduces the temperature inside.


Is there a good time of year to replace my polytunnel plastic?

You'll probably have a good idea when the time's coming up to replace your polytunnel cover and ideally, you'll want to wait for a warmish day to do it, as it makes the polytunnel plastic more flexible. It's not essential though, especially if you have the option to re-tension the cover after fitting. However, to make the task as straightforward as possible, wait for a calm, non-windy day. Why not read our blog on covering a polytunnel for more tips. 

Don't forget, our polytunnel covers are made to last - the polythene we use for our covers is specially developed to resist UV degradation for up to 5 years, although it’s not uncommon for them to last for up to 10 years. When the time eventually comes to replace your polytunnel cover, you can do so quickly and easily at Premier Polytunnels.