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Tunnel houses / Polytunnels 3.1m to 4.9m wide. Cover a lot bigger area than a glasshouse of similar cost, "more bang for your buck"

Strength and durability is the cornerstone of our business and we don't believe in cheap, flimsy materials. That's why we were pleased to find a range of polytunnels that are designed and manufactured in the UK by Northern Polytunnels, one of the leading Polytunnel manufacturers in the UK. They only use the highest quality materials, such as high-performing steel with special protection against corrosion.

We have always preferred aluminium for construction because it does not rust, however it is not as strong as steel. With ArmourGuard®, a newly developed high-endurance protection treatment, steel tube becomes the material of choice. By combining extraordinary levels of corrosion resistance with the durability of high strength steel we have an ideal structural material that easily outperforms aluminium as a main structural component. ArmourGuard® offers up to 20 times the corrosion resistance of pre-galvanised steel tube thanks to its revolutionary combined zinc, aluminium and magnesium coating.

ArmourGuard® is designed not just to survive in the most hostile environments, but also offers extreme longevity. In exhaustive tests carried out by Rotech Laboratories, one of the UK's leading test houses ArmourGuard® endured the equivalent of 100 years' exposure to the harshest elements without undue deterioration. Real life can be a bit different, but we are confident to give ArmourGuard® coated components a 30 year guarantee against corrosion.

Aluminium bottom rails and door frames means there is no timber to rot and warp or to leach treatment chemicals into the ground.

Environmentally Friendly
ArmourGuard® even protects the environment by reducing the amount of zinc which is used in the manufacturing process compared to the fully galvanised steel tube. By extending the product life we are also reducing the overall long-term consumption of steel and the related energy inputs.

Three month salt water spray test comparison

Top: Plain Steel, Middle: Hot dip galvanising, Bottom: Bottom: ArmourGuard

Please Note. Our 30 year guarantee against corrosion applies to ArmourGuard tubular steel components only (arches, stabilisers, bracings & ridge tubes). Even though all the brackets and fittings are also fully galvanised, they are not protected with our ArmourGuard® coating and as such do not carry the same guarantee. However, the steel used to manufacture our fittings is 2-3 times thicker than the wall thickness of the steel tube. Our polythene covers and anti-hotspot tape have up to 5 years pro-rata guarantee against UV degradation, but as it is one of the main cover materials used by the commercial industry in New Zealand so we expect it to last longer than that if looked after.

Question: So why use plastic if it fails in time, why not glass that lasts longer.

Answer: It is about cashflow. If you are going semi commercial or going to grow for a Farmer's Market you can get a lot of polytunnel for a lot less money than a glass greenhouse of the equivalent size. This means you may be able to avoid a loan (going into debt) and all the interest asscociated with it. If your venture is successful the profits will give you the ability to replace the cover at a later date out of cashflow. I have a cover on one of our smaller domestic tunnel houses that is still the original cover after 15 years!

All the steel tube is construction grade Z35 that is corrosion protected both inside and out. The tube is 32mm in diameter with a 1.5mm wall thickness.

Benefits of Purchasing one of our Polytunnels

"More bang for your buck" Cover a large area a lot cheaper than if you used polycarbonate or glass

Screw Anchors - No digging, no mess and very quick. Strong grip in the ground.

Strong 32mm diameter steel hoops - ArmourGuard® treated, long lasting for all weather conditions

Aluminium Sliding Doors - Easy to assemble and problem free

Aluminium Door Frames - Pre-cut - no carpentry required. Concreted in the ground for extra strength

Aluminium Base Rails - No need to trench-in the cover. No rot, no leaching, no warping

'Wiggle Wire' Polythene Fixing System - Quick, simple & secure and easlity undone if required.

Lagging on frames coming into contact with the cover - makes the cover last much longer

Cover is drum tight - makes the cover last a lot longer

200mu cover - Cover material is widely used in NZ on commercial tunnels, one of the best available.

Cover is a one piece rectangular sheet, not welded - No seams to break open and you can use any supplier in the future for a replacement cover if you wish. You are not tied to any particular manufacturer.


Screw Anchors By far the best and most popular method. Suitable for most soil types, especially clay soils. Avoid only on ground with a high stone/rubble content, peat soils, or loose soil which has been recently disturbed or deeply cultivated. In this case it is advised to dig a hole with some undercut and concrete in the screw anchor.
Each screw anchor only takes 1-2 minutes to screw into the ground. Compare this to the time it takes to dig each hole when using either the concreting method or ground anchor plates, and without any of the mess or exertion. In recent tests, the strengths of different polytunnel foundation options were measured. The tests showed that the screw anchors out-performed all other methods in most types of soil.

Screw anchors also incorporate a unique polytunnels cover tensioning system where the hoops are raised (and locked into place) after the cover is attached to achieve a drum-skin tight finish. The tigher the cover, the longer it will last!


Stronger Two Piece Steel Hoops For All Weather Conditions
Hoops that are made from three or four pieces are easier to make and more convenient to deliver, however they are not as strong as a two piece hoop and often require extra bracing bars to support them. That is why we only have two-piece hoops, and one of the reasons why so many of these polytunnels are sold to customers in the Scottish Highlands and Scottish Islands. All the steel tube is protected with ArmourGuard® coating, 32mm diameter with 1.5mm wall thickness.




Doors...Easy to Assemble and problem Free

Aluminium Sliding Doors. Made from easy-to-asemble aluminium sections incorporating our unique "W-WIRE" polythene fixing system. Supplied with enough materials to fully clad it with polythene, or to clad the top half with netting for extra ventilation.

An optional aluminium door can be installed at the other end to give a door both ends.



Aluminium Base Rails, Aluminium Door Frames all pre-cut.
Due to the natural variances which occur in timber and its much shorter lifespan we use aluminium for the base rails. Some customers are concerned about CCA treated timber (Copper, Chromium, Arsenic) leaching from timber into the soil and possibly being taken up by their crop. There is no CCA leaching with Aluminium. Aluminium is also straight and does not warp like timber can, a big advantage in a long polytunnel.

Note the aluminium door frames are concreted into the ground (both ends) resulting in even more strength.



"Wiggle Wire" Polythene Fixing System...Quick Simple & Secure
The aluminium base rails, doors and door frames all incorporate our unique "W-Wire" polythene securing system. Simply weave the "W-Wire" into the open channel of the aluminium rails & frames securely trapping the polythene in place. Don't worry if you have to redo a section, it's easily unclipped and can be wiggled back into place in a jiffy, ensuring a tight neat finish every time. This is especialyy useful when pleating the polythene around the door frames. We believe the "W-Wire" method is the easiest and quickest system on the market. If you are in a very exposed postition then for a very small cost extra "W-Wire" can be purchased to double up the fastening of the polythene.







Watch the video below to see how easy construction is. A printed assembly manual in colour is supplied with each kit and you can aslo download it, follow the link below.

Click here to download a PDF of the assembly instructions (20Mb)


What's so great about the Easy- Build Polytunnel



The Easy-Build kit, Basic kit, what is included.
Our basic Easy-Build polytunnel kit includes all our unique features mentioned above, but also includes our most popular options: Single sliding door at the front, PVC ventillation panel at the rear, screw anchor foundation tubes and Polygro 200mu commercial grade greenhouse film that we source from a New Zealand supplier to get the most UV resistant material.

The series of pictures below show a 1.8m tall person standing inside one of our polytunnels. Grow tall plants right to the walls.

Being UK made the sizes are in feet so we have converted to the approximate equivalents in metres. Steel hoop spacings are at 1.52m (5ft) for extra strength.

Further options can be added at extra cost such as double doors (wider models) cross bars, extra ridge tubes, extra rear door, roll up side ventilation and staging. Prices in the table below are for the basic Easy-Build kit.

Basic kit prices including GST, excluding freight

If the length you require is not listed below then please email us with your size for a quote. Contact us

No limit to length provided it is in increments of 5ft (approx 1.52m )

Length ft Length m 3.05m (10ft) wide 3.7m (12ft) wide 4.3m (14ft) wide 4.9m (16ft) wide
10ft 3.1m
15ft 4.6m
20ft 6.1m
25ft 7.6m
30ft 9.1m
35ft 10.7m
40ft 12.2m
45ft 13.7m
50ft 15.2m
55ft 16.8m
60ft 18.3m

Freight is additional and you will see how much this is when you select the model you want and the length before you have to enter your card details. You can also pick up from our base in Tuakau for a minmal fee (we have the covers freighted to you from Auckland seperately and don't hold them in stock). Please contact us for a quote. Contact us

Choose 10ft width and required length plus destination: Towns and PBT Transport depots only, please email for a rural delivery quote. Sorry all 10ft wde models sold out.

Choose 12ft width and required length plus destination: Towns and PBT Transport depots only, please email for a rural delivery quote.

Choose 14ft width and required length plus destination: Towns and PBT Transport depots only, please email for a rural delivery quote.

Choose 16ft width and required length plus destination: Towns and PBT depots only, please email for a rural d elivery quote.


Door Frame and Door Options

Single Aluminium Sliding Door

Our Easy-Build polytunnel comes with aluminium doors and door frames as standard with each piece of aluminium cut to size, eliminating the need to cut down or trim any excess material. Each component easily fastens together using steel brackets, removing the chances of making mistakes whilst also removing the requirement for carpentry skills (which would be required to assemble timber doors). All doors are supplied with all the necessary hardware, including door guides, handles, drop bolts etc.

Aluminium Sliding Doors Made from easy-to-assemble aluminium sections incorporating our unique "W-Wire" polythene fixing system. Supplied with enough materials to fully clad it with polythene, or to clad the top half with netting for extra ventilation..

Several door options are available Our single door frames have a 0.8m opening. The double door frames have a 1.7m opening. Due to the extra width of a double door frame they are only available for 3.6m (12ft), 4.3m (14ft) and 4.9m (16ft) wide polytunnels.

The height of the door lintel is approximately 2m.

Double Aluminium Sliding Doors

3.05m (10ft) wide polytunnels, single doors Single door at one end with a PVC ventilation panel at the other. (this comes standard). Single doors, one at each end an extra $255.00

Double doors are only available for 3.6m (12ft), 4.3m (14ft) and 4.9m (16ft) wide polytunnels because they won't fit a narrower tunnel. Upgrading to a double door from the standard single door unit $244.00. Double doors can be fitted both ends, $499.00 for the additonal door.





Ventilation Options

PVC Ventilation Panels.....Installed in 5 minutes (included with basic Easy-Build polytunnel)

Ventilation partially open
Ventilation open
Ventilation closed

Fabricated from a translucent PVC fabric mesh insert. It comes with a removable translucent PVC fabric panel which simply attaches over the mesh (to seal the vent) with its Velcro edging.

The panel can be fully opened, fully closed or partially opened. Gives ventilation without allowing unwanted pests to enter your polytunnel. Quick and easy to fit. Only available with single door frames and only one per structure as this option isn't used for access.






Side vent half open

Side Ventilation (optional extra)
Although doors offer ventilation on shorter polytunnels throughout most of the growing season, additional ventilation can be necesary on longer tunnels, especailly if you are growing through a hot summer. This simple to operate, low cost ventilation system offers a practical solution during hot summer months. Simply wind up the polythene side when required and wind down when you want to retain heat. The screened openings keep most bugs at bay. These can be fitted to one or both sides of your tunnel. The kit includes an aluminium side rail, external polythene wind-up screen and netting (to cover the ventilation holes). The holes are cut into the main cover once the side rail has been attached. This kit can be fitted to one of our tunnels at a later date if required.


Horizontal brace bars. Staging to the left not included.

Brace Bars (Widthways Crop bars) (optional extra)
Although often used to hold hanging baskets, or to support lateral poles on which to tie up your tomatoes, beans peas etc, they are often added to a polytunnel to give it extra strength. Even though we boast our tunnel houses are very strong, they give peace of mind during severe windy storms and also when heavy snow is expected. They increase the strength by at least 20%, so well worth considering if you are in a high wind situation. Can be retrospectively fitted to an existing polytunnel. Brace bars when installed are approximately 1.85m above the ground.





Additional Ridge Bars (Lengthways Crop Bars) (optional extra)
The basic polytunnel will always have a central ridge bar, but additoinal ridge bars can be added to either one or both sides of a polytunnel. They will increase the strength a little, but the main use of these is to provide crop support along the length of the polytunnel. They can be positioned and re-positioned to the most convenient place for the crop you are growing.





Staging (optional extra)
Our polytunnel staging kits are a low cost solution where a full length bench is required for your polytunnel. We ONLY provide the strong steel frame, leaving you to provide your own table-top. Some customers use heavy-duty galvanised wedmesh, whereas others choose timer slats. Whatever your choice, our stagin provide the ideal framework on which to grow your potted plants. Supplied with fasteners for fixing timber slats. can be installed in new and existing polytunnels.

Click here to download a PDF of the staging assembly instructions



1 bay
4 bay
5 bay
6 bay
7 bay
8 bay
9 bay
10 bay
11 bay
12 bay


Free freight if ordered with a polytunnel. Choose number of bays required