Since its inception in 1969, Northern Polytunnels has dominated the commercial polytunnel markets with their high quality, durable structures. This has landed their polytunnels in large-scale commercial nurseries across the UK, who in-turn supply household names like B&Q, Waitrose, M&S, Dobbies Garden Centres amongst many more.

The team at Northern Polytunnels turned their attention towards designing a polytunnel with the same strength and durability it has become renowned for, scaled down to suit the hobby gardeners around the country but simple enough that you can put it up yourself with minimum assistance needed.

The Easy-Build polytunnel kit requires no specialist tools to be put erected as everything simply slots and bolts together, so it is quick and easy to install. The Easy-Build even uses screw-anchor foundations, so you won’t need to use your shovel either. Taking inspiration from the commercial range, the framework, which already has a wider diameter than our competitors’, also includes Northern Polytunnels’ own ArmourGuard° coating which gives the steel framework a lifetime guarantee against corrosion. Northern Polytunnels is the only company that can offer a lifetime guarantee on the framework for hobby tunnels.

We’ve included a step-by-step guide on how to build your own Easy-Build polytunnel:

Before you start… try to pick a weekend with as little wind as possible, this will reduce the chances of setbacks when you’re attaching the polythene cover.

1.       Secure your foundations

For our Easy-Build structures, we recommend using our screw anchor foundations unless the ground has a high stone/rubble content or is particularly loose. Once you have marked out where the base rails of your polytunnel will be going and ensuring that they are evenly spaced from each other, the screw anchors can all be screwed into their correct depths. To do this, simply insert the ‘T’ bar through the holes at the top and turn clockwise, much like a corkscrew, until there is about 45cm of the pole sticking out of the ground.

2.       Assemble the framework

- Using the base rail pack, assemble the bars and their brackets, all of which are included with their own set of instructions, and then slide the rails onto the foundation tubes as close to the ground as possible.

- The next step is to connect the two hoop pieces with the cross over clamps. Once this has been done, you can lift the hoops and slide them onto the foundation tubes with the clamps facing inwards. You may need two people for this part as the hoops will need flexing into position and onto the foundations. Once these are secure, the ridge tube sections can be slotted into place.

Once you are confident that everything is lined up as it should be, secure all the joints carefully.

3.       Build and fit the door

- Lay the three box sections on the ground in a ‘H’ formation, with the outside face facing down. The door frame lintel should be approx. 30cm in from the end.

- Add two bolts into the rear grooves on each side of the shorter section and two more bolts at the top of each of the longer sections. Place the door frame in position and tighten the nuts on both brackets.

- Slide two bolts on each side up from the bottom of each door upright. Use the lower two bolts to fix the door frame stabiliser about 45cm from the bottom. Attach the end base rialto the corner base rail fittings.

- Position your door frame in the centre of the hoop and base rail and slide the door post bracket into position then fasten. The base rails should match the door posts evenly.

- Reposition frame bars as needed.

4.       Apply the polythene cover

- Using the anti-hot spot tape in your kit, before applying the polythene, go over the metal hoops with the tape to create a layer between where the polythene will go and the hoop.

- The hoops need to be covered from base rail to base rail so that any heat build-up in the steel is not transferred to the polythene which could damage it. Doing this extends the life of the polythene and will lead to less repairs needed over its lifespan.

- When it’s time to attach the polythene to the structure, unroll it along one side of the polytunnel and pull over the frame. If you have installed a door into your tunnel, secure the sheet into the groove of the door and use the ‘W’ wire to secure in place. Do this on both side of the polytunnel as tightly as possible.

- Using the ‘W’ wire again you can start securing the polythene to the side base rails from the middle outwards. Keep the first side secure but not too tight, and then when you attach the polythene to the other side you can pull it tightly against the frame.

- Repeat the same on the end base rails and, using a sharp knife, remove any excess polythene.

- Once you’re happy with how the cover looks, apply a second lot of ‘W’ wire along the door lintel to give the polythene extra hold.

5.       Tension the cover

Inside the tunnel, lift each hoop up, one side at a time. Slide the locking collar up to the bottom of the hoop and tighten the bolt. Repeat this on every inner foundation tube to properly tension the polythene.