A 12ft wide polytunnel will easily allow you to have one central bed and a further growing bed on each side - a layout that can really maximise the use of space while making it easy for the gardener to get around. If you are taking the next step on your journey towards a more sustainable way of life then a 12ft polytunnel could be perfect - big enough to grow a quantity of food but not so big that it becomes overwhelming in a domestic setting, on an allotment or in a community garden.
Check out 'What's in the Kit' to find out exactly what is included in your purchase of a 12ft wide polytunnel, then scoot on over to our accessories sections to see what added extras you may wish to include. Crop bars and staging will help you make the most of your space, while you can optimise your tunnel to meet your particular needs with things such as base rails and sliding doors. Even better - the more extras you include, the more you can save with our fantastic bonus save offers. Just pop everything in your basket to find out how much you can save on your ideal 12ft wide polytunnel.
The 12ft (3.66m) wide Polytunnel is another very popular Domestic option, ideal for the larger garden or allotment. On this width the straight sides give you ample room for staging, increasing your growing potential no end. Like all of our Domestic models, it comes with 'real' doors at each end, ensuring good air circulation.
Technical Specification
Width | 12ft (3.66m) |
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Hoop Spacing | 5ft (1.53m) |
Overall Height | 7ft 7in (2.31m) |
Straight Side | 3ft 3in (0.99m) |
Head Room (15cm from side) | 4ft 8in (1.42m) |
Hoop Diameter | 1in (25.4mm) (1½in (35mm) on Super) |
Steel Specification | E370 Galv High Tensile |
Door Opening Width | 2ft 3in (0.69m) |
Door Opening Height | 6ft (1.83m) |
Distance over Hoop | 22ft 8in (6.90m) |
Door Frame | 3in x 2in (75mm x 47mm) |
Inner Door | 2in x 2in (50mm x 50mm) |
Base Rail | 3in x 2in (75mm x 47mm) |
Downloadable instructions before you buy. All of our Polytunnels are supplied with a printed copy of the assembly instructions, however we invite you to visit our dedicated construction portal at construct.firsttunels.co.uk prior to purchase. There you will find comprehensive instructions and videos available for download. This ensures that you are fully informed about the assembly process and what to expect from your Polytunnel.
Complete build videos. We’ve created a series of detailed videos, showcasing the entire construction process of our Polytunnels. From the basic setup to the inclusion of every possible option, these videos are designed to guide you through each step of the build. By watching these, you’ll gain a clear understanding of the effort and craftsmanship that goes into each of our Polytunnels.
Embark on the thrilling adventure of constructing your expansive 12ft wide polytunnel with our exclusive playlist! Immerse yourself in a thoughtfully crafted series of step-by-step tutorials, expert tips, and insightful demonstrations designed to guide you through each phase of your polytunnel project. From the initial planning stages to the final embellishments, think of us as your dedicated companion.
Discover the essential tools and materials crucial for a triumphant build, and uncover clever hacks tailored to simplify the process, ultimately saving you valuable time and effort. Our committed experts are ready to personally guide you through foundation preparation, frame assembly, cover installation, and all the intricate details needed for crafting a resilient and functional 12ft wide polytunnel.
Join us on this captivating journey to transform your gardening space into an impressive 12ft wide polytunnel haven. Happy gardening!
James Ridout
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Verified order
So far so good! Ordering process straightforward, with excellent advice from the staff, Tunnel arrived in good order, but will not be erected until February |
Alan B
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Verified order
Good solid build with good options depending on where your site is, growing requirements etc. only minor problem was some of the door frame timbers were bowed but I was able to resolve this in the construction. |
Elspeth
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Verified order
Straightforward to construct, though we have a competent DIYer in the family. |
Jason
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Verified order
Brilliant so far |
Alan Rainford
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Verified order
Excellent, robust polytunnel. Easy to assembly over a couple of steady days. Very pleased with it. |
Anthony Man
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Verified order
Quality of construction and design is amazing, as a retired engineer I found the instructions simple to follow and the tunnel easy to assemble. For a person with less practical skills this could be an issue but the QR videos make it easy. The quality of service and follow up is second to none, I wish I had bought my other 2 tunnels from First Tunnel. We have no hesitation in recommending this company and their products. |
Mike Banks
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Verified order
Excellent strong polytunnel, wish I had more room for a bigger one😀 |
Alana Barker
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Verified order
The polytunnel frame was easy enough to put up and is great quality. Unfortunately it does look like the polytunnel has been updated but the instructions haven't. We had 1 piece of wood split on the door, but not the end of the world. It does take a while to put together and you have to be pretty competent and have the right tools for the job. Overall, Its looking great and should last a while, when Tweedledum and Tweedledee finally get it together. Day 4 of building. |
William
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Verified order
Can't send photos in cases I assemble it wrong 😃😃ps to be honest I cant |
Inna Bird
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Verified order
Fantastic service! Excellent quality! Highly recommended! Great experience! Thank you very much! |
Mrs M Stubbs
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Verified order
have not installed yet, but all arrived in good time and all parts are listed clearly |
Derek
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Verified order
11 days of work so far to get it up so not to be undertaken lightly |
Paul Farrow
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Verified order
Great product, great service. Clear communication and helpful |
Andrew Haggar
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Verified order
Nicely made and relatively easy for DIY person to assemble. |
KCorbitt
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Verified order
Excellent quality and really impressed with the books and extras in the free goody bag. All really well thought out. |
Mr Squibb
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Verified order
Have not erected it yet but everything looks fine |
lloyd cooper
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Verified order
Very good polytunnel , I would recommend using the base rails( we didnt) it would make tensioning the polystyrene much easier! My only quibble would be the wooden doors which look great when you first put them together then warp beyond belief( they need to be better kiln dried from the suppliers I think. |
Nick
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Verified order
Very sturdy. |
Pierino
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Verified order
I thought is might be too big but the extra space is great to have. |
Andrew Sullivan
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Verified order
Not even received yet |
Alistair sprague
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Verified order
very well made product nice and easy to put up |
Customer
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Verified order
Not actually put it up yet but hoping to in the next few weeks. |
customer
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Verified order
Great bit of kit |
CustomerRobert Eachus
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Verified order
Unable to be specific as still awaioting delivery but from website appears to offer all I was seeking |
Chris Turner
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Verified order
A good product which meets our needs very well |
Emma Hughes
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Verified order
New cover for our old polytunnel, looks better than it did when we first put it up 7 years ago! |
Elizabeth Broadbent
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Verified order
Once we had put the Polytunnel together (it took about 36 hours altogether) it is very sturdy - already been subjected to 90mph winds, so would reccomed this product. We are experienced in DIY, watched all the videos and followed the instructions but would definitely recommend a fitting service as we did find some aspects were very frustrating. |
Alan jones
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Verified order
Very pleased with my new polly tunnel, the service has been second to none. If I had a problem there was always someone there to sort it out for me, from start to finish I was always treated like a valued customer. Would give product and service a big 10 out of 10. Many thanks, alan. Shropshire. |
Mark Alexander
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Verified order
A great tunnel. Taken a couple of weekends to put up, even when being helped by an experienced polytunnel builder. I'm sure it'll be worth it though come the Summer! |
peter bainbridge
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Verified order
I have not erected my tunnel yet but my dealings with your company have been excellent |
angela raim
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Verified order
Really fabulous with great support from the team. I did a self build but I’m a first timer if everything works out right it would of been a doddle I did have help some what but from men who didn’t watch the how to vids and knew it all without the need they said but I wish they had watched them it would of made the job much easier. But that said the tunnel is up I finished it by myself That being said if I ever buy another I know I will have them build it and also where as it took me 3 weeks they would of done it in a few hours and the would of picked the right spot I’m reall thrilled with it I’m thinking of getting a bigger one which I will get them to build xx love it |
Harriet Waldron
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Verified order
Well it certainly looks very sturdy and professional, with lots of space. Nervous about the first real storm we have, but very impressed with the overall product! |
Bd
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Verified order
Excellent service |
Health Stars
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Verified order
Looks great, really happy with the poly tunnel |
Christopher Robinson
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Verified order
Excellent piece of kit. Great and easy to understand instructions. The QR code shortcut to helpful videos was a great feature. The reason for not giving the full 5 stars was due to a missing piece. Even though when I spoke to the team they were very polite and helpful, it was a little frustrating to wait 3 days to receive it and for the price I paid, I would have expected next day delivery to rectify the problem. |
Malcolm Swinburn
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Verified order
Product looks very good. Delivery was also very good. Instructions are not so good making erection rather difficult for people without experience. |
Roy Wyatt
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Verified order
Good quality product well designed easy to put together by 60 + husband and wife team. Although took about 5 days Doing bits and pieces when we could. Instructions clearly set out and backed up very helpful videos. Well done. |
Jenny
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Verified order
very good replacement for like-for-like old one |
Julie
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Verified order
The poly tunnel is fantastic it retains the heat and has enabled us to be on the allotment in poor weather and plant out early crops |
Mr T Negus
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Verified order
Great quality product, excellent construction team there to provide any additional support when building, and excellent customer service. Highly recommend and would use again in the future |
Derek
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Verified order
Great service, everything supplied at a reasonable cost |
Amanda Letts
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Verified order
Nice product...can be a bit tricky in places to work out how to put it up but with the instructions and video tutorials we got there in the end. would definitely buy another in the future. |
C Mills
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Verified order
So far so good. It has been up about a month and doesn't look like it's going anywhere. We followed the advice of work out how much space you think you'll need the double it. I'm glad we did |
Mrs Georgette Wormleighton
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Verified order
The quality of the poly is good and it looks solid. The size is a good roomy one and offers lots of scope for growing. |
Geoff Allen
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Verified order
Again, an excellent product, and well made. |
adam walsh
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Verified order
Have not constructed yet (weather and I cannot get our schedules sorted out) but was delivered extremely fast and instructions look cushty. Even came with a free tea bag for reading the instructions with - although, for future reference - I prefer coffee or a nice beer |
Richard Miles
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Verified order
This is my second polytunnel from First Tunnels. The first (14x21’) was brilliant and so productive year-round that I bought my second. This 12x20’ went up easily and almost all parts were perfect and easy to assembe. Not sure but I think the quality of the timber, especially the battens, seems poorer than 2 years ago but plenty spare so no issue. Now I have a serious problem - my next tunnel is going to be VERY expensive as I’ll have to buy a new house with a bigger garden to accommodate it. Unless I can convince my wife to sacrifice the last bit of remaining lawn! |
Mr A Pike
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Verified order
A really well designed kit. As a first polytunnel build it was pretty daunting, but there are some excellent design element (e.g. all the bolts, clips, and some of the poles are the same gauge/size, and the wonderful tensioning base rail) which meant we could improvise to fix our mistakes (and there were a few - all our fault). I would definitely recommend and buy again. A few little gripes (hence the 4 not 5 star rating), but certainly none of them deal breakers, and if I could score 4.75/5 I would. Some of the timber was not perfectly sized. The door posts were not twice the width of the battens. Luckily we spotted this early on when putting in the revetment, but if we hadn't, the door likely would not have shut and we'd have had a lot more nail stripping to do. The instructions for hinging the door could have been clearer, it took us a few goes to work out that battening the frame to match the door was the solution. The corner stabilizers were so long they fix on the curved portion of the hoop, so create a diagonal about 10 inches into the the tunnel (i.e. away from the vertical wall). This has made it difficult to run the staging all the way to the end hoops. How I hated the self tapping screws - a whole day of shoulder and knee aching work.....though I imagine everyone complains about these. I pre-drilled with a HSS drill bit , then started with one tapping screw. Threw it away about half way through and used a second. This worked, but still really slow. Putting the poly on in a tight space (unlike the lovely flat garden shown the videos) was a little long winded and heart stopping. But retrospectively, the poly was folded in such a way that we might have hauled the roll onto the ridge and unfurled it in situ. This might be a fab design feature, but not mentioned in the instructions. Some of the wood was quite soggy. I dont suppose this matters given its all going to be exposed, but it was a bit disconcerting. Nevertheless, we really enjoyed putting it up, and while it was hard physical work at times, it was never difficult or impossible. And a newbie tip (learnt the hard way). Get the Q clips on the poles from the outset, and I borrow a dumpy level to get everything at the same height. |
Paul
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Verified order
Decided on purchasing a second polytunnel to allow All year growing |
Mark Cornell
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Verified order
Ideal size for commercial or home gardening |
Simon Robinson
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Verified order
Excellent service as usua !l tunnel very good quality well packaged and labelled we together with ease |
Sophie
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Verified order
It's amazing. It took longer than suggested to put up but my Dad and I managed it and it is fantastic. The plastic is easy to tension and it looks great too. |
Murdoch McCracken
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Verified order
Have already put in my raised beds and very pleased |
Joe McTernan
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Verified order
High quality and lots of extras to support the novice have a successful start to poly tunnel life. |
Mike Edge
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Verified order
Great quality product, extremely sturdy. |
C J Featherstone
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Verified order
Easy to use and very informative website. Speedy delivery. Looking forward to building and using our new Polytunnel ASAP! |
Fionagh Harding
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Verified order
I love my tunnel; all I've had to do is provide the elbow grease, everything else has been thought through with care and attention to detail so that the finished tunnel will be perfect if the instructions are followed. |
C J Featherstone
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Verified order
Our kit arrived within two days of placing the order. Very informative booklet and easy to access 'bite-size' videos guiding you step-by-step through construction. We purchased an upgraded version of our chosen tunnel, with belt, braces and safety pins as we live in a very exposed mountainside location, but having watched the video of a First Tunnel Poly Tunnel in a storm force gale on a cliff top, we have every confidence that ours will be fine! The 'Lucky Pack' that came with it includes everything you need to learn how to get maximum results from your poly tunnel. We are really looking forward to completing ours and starting our poly tunnel growing adventure! |
Alan Hockley
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Verified order
Good quality product. Can't wait to start growing in my polytunnel! |
John
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Verified order
A good product with everything arriving in good time and in good condition. |
David Oliver
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Verified order
Great product, good quality |
Adele McRae
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Verified order
High quality product, robust enough to withstand the weather in the Cairngorms area of Scotland. |
Customer
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Verified order
HAVE'NT PUT THE TUNNEL UP YET BUT HAPPY SO FAR WITH THE SERVICE I EXPECT IT TO BE EVERYTHING I WAS HOPING FOR |
Cobi Snelson
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Verified order
Extremely good quality - very well made. |
Customer
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Verified order
Quality item. Looks strong and good quality although we have not put it up yet. |
Karen Utting
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Verified order
ordering and delivery were great and very easy. Have yet to construct the polytunnel but have read the instructions which are clear to follow. I know that if I get into trouble there is online support. |
Lynn Williams
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Verified order
I already have the 24ft version and the quality is great. we need extra growing space now so going for the longer one as an addition. Always get the largest one you can fit because you may need it in the future. |
We supply Timber Hinged Doors at each end, Anti Hot Spot Tape, Timber Base Rails and of course the Framework to support our 200 micron Super Therm Polythene cover. These options are pre-selected below, but can be amended to suit your needs.
You will be required to secure the foundations into concrete, alternative methods of securing the polytunnel can be selected, eliminating the requirement of concrete – see ‘Polytunnel Foundation’ section.