Tunnel houses / Polytunnels 3.1m to 4.9m wide. You can cover a much bigger area than a glasshouse of similar cost, "more bang for your buck"
Please note we can also use our frames to make a very strong shadehouse, something to consider if you want to protect young plants from intense summer sun. You will find plants grow very well in some shade, especially a small seedling tree that would normally start on the forest floor protected by its larger parents.
COVID-19 has changed the world, probably forever. It won't be the last time we see it, and should it come back more contagious and deadly, leaving home to get food might be very risky. Time to get more resilient and less reliant on supermarkets for your fresh herbs, fruit and vegetables. If you want to have on hand fresh food at any time of the year, crop protection is essential. Whether it be from birds, pests, weeds, weather or diseases, it is an important next step for producing healthy quality crops with minimal wastage and chemical use.
Please note. We do not sell individual components to people who want to build their own polytunnel. We keep our components for our own polytunnel customers in case they need after sales service.
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 Z35 grade steel with special protection against corrosion. Read on ......
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.
Aluminium bottom rails and door frames means there is no timber to rot and warp or to leach treatment chemicals into the ground.
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 electroplated, 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 has up to a 5 year pro-rata guarantee against UV degradation, but since it is the same cover material that is used by the commercial horticulture industry in New Zealand, we expect it to last longer than this 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 your 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 UK made Z35 construction grade steel 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.
Anti-hotspot tape on the frames that come into contact with the cover - it 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.
The 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. The frame can also be covered with shade cloth to make a shade house.
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.
Screw anchors also incorporate a unique polytunnel 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 tighter the cover, the longer it will last!
Screw anchors are screwed approximately 500mm into the ground (T bar supplied)
Two Piece Steel Hoops For All Weather Conditions
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 extra aluminium door can be installed at the other end to give a door both ends.
Base Rails, Aluminium Door Frames all pre-cut.
Note the strong aluminium door frames (profile shown below) are put into the ground (both ends) resulting in even more strength. I prefer to concrete them in for extra stability.
Wire" Polythene Fixing System...Quick Simple & Secure
Watch the video below to see how easy construction is.
The Easy-Build kit,
Basic kit, what is included.
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. Northern Polytunnels have an option of 6ft spacing, but with only a small in price difference we felt the strongest available for a little more was a better option.
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 (polytunnel with single door) including GST, excluding freight
Please note the GST inclusive prices in the table are very close ballpark figures. Please email us with your requirements and we will give you an accurate quote. We can do virtually any length, provided it is in 5ft (approx 1.52m) increments. Contact us
Sorry now sold out in 14ft wide models.
Freight is additional and we will obtain a quote on this once we know what is wanted.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
Door Frame and Door Options
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 (optional) 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.
Extra single doors if you want single doors both ends. approx $468
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 . Double doors can be fitted both ends, approx $1,198 for the additonal door. Please note the picture shows the optional vent system.
PVC Ventilation Panels, no access.
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.
$266.75 plus freight if ordered by itself.
No extra freight if orderd with a polytunnel.
Side Ventilation (optional
Approx $122.50 per bay per side plus freight
Brace Bars (Widthways Crop bars)
Horizontal brace bars approx $60 per bay plus freight
Horizontal brace bars with crop hangers approx $115.52 per bay plus freight
Ridge Bars (Lengthways Crop Bars) (optional
Ridge bars approx $62.00 per bay plus freight
Approximate pricing, ask for a quote