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What Are the Disadvantages of Polytunnels?

What Are The Disadvantages Of Polytunnels

Polytunnels can be a great tool to help you grow vegetables or fruit without spending a lot of money. But there are some drawbacks to using them. Here are some of them: size, UV protection, and pests. In order to make the most informed decision, you should know your budget and growers’ requirements before purchasing a polytunnel.


The cost of polytunnels varies greatly. Larger ones are more expensive than smaller ones. If you only need them for a short time, you can get a cheaper model. However, if you want them to last for years, you should invest in a higher quality model. Depending on the size and construction, polytunnels can cost anywhere from fifty to several hundred dollars.

The size of the polytunnel is also important. The larger the model, the higher the price. You can purchase polytunnels that are ten, fourteen, or eighteen feet wide. They can also range from 12 to 90 feet long. Commercial polytunnels are usually larger than domestic ones. Most polytunnels come with instructions, but it is advisable to hire someone to assemble the structure for you.


Polytunnels come in a variety of sizes. However, the standard size is either 14 feet or 18 feet. You can also buy smaller tunnels if you have smaller children. You will need to check your budget and how much space you have for the tunnel. Polytunnels are an investment and should last for several years.

The size of the polytunnel should be proportionate to the number of people who will be using the unit. Smaller ones can be easier to put together, but can take a lot of time and effort. Small polytunnels may also come with poles or metallic pins to help secure them to the ground.

UV protection

Polytunnels are covered with polythene films to protect them from harmful UV rays. They are great for growing plants indoors but can also be used to enjoy the outdoors. A polytunnel can be a good investment for your garden, whether you’re growing vegetables or flowers.

The life expectancy of a polytunnel will depend on the frame material and the quality of the polythene covering. Different polythene coverings have different strengths and weaknesses. As a general rule, a polytunnel made of polythene should be replaced every five years or so. However, a higher-quality covering may last for 10 years or more.

UV protection of polytunnels can be achieved by using UV A and UV B filters. These filters will help prevent fungal diseases and reduce the amount of condensation. They may also contain an Infra-Red additive that reduces the speed at which heat dissipates, which may lead to fuel savings of up to 20%.


While polytunnels are a good barrier against larger pests, smaller pests can still find their way into them. It is vital to regularly check for pests and use sticky traps to trap and remove them as quickly as possible. You can also purchase sticky trap cards that will catch a variety of pests. If these are not available, you can always install screens over walls and openings. Also, keep an eye out for areas over vents and fans, as these can provide entryways for pests.

Aphids are another common pest of polytunnels, and they can easily become out of control if you don’t keep a close eye on them. The key to managing aphids is to keep your plants healthy and in good condition. This is because aphids prefer plants that are not in good health. Plants in good health have enough water and the correct nutrients to resist pests and disease.

Planning permission

Planning permission for polytunnels is not always needed, but it is important to follow the guidelines of your local planning authority if you intend to build one. If you live in a conservation area, then the guidelines are even stricter. Also, if your polytunnel is on an allotment, it’s a good idea to check with the allotment committee to see if there are any size restrictions or rules about what kind of structure you can build.

Generally, polytunnels don’t need planning permission if they’re used only for domestic purposes. However, if you’re going to use your polytunnel for a wider purpose, then you might need to apply for planning permission. You can find out more about these rules by visiting the Department for Environment, Food & Rural Affairs (DEFRA).