First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long
A large 14x20 tunnel for keen veg growers
Prices move a lot, especially in spring. The retailer shows the current price. We earn a small commission if you buy through this link, and you pay the same. More on that.
Is the First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long any good?
With 3 out of 10, the First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long ranks 38 of 38 in our comparison. Strengths: About 26 m2 of growing space for just over £1,000, 35 mm tubing stands up to wind and snow better than 25 mm. Weakness: Needs a big flat site, and many allotments ask permission first. Best for: Allotment holders and smallholders who want to grow food under cover all year.
In short
The 14x20 is First Tunnels' largest domestic model, with 35 mm galvanised high-tensile steel hoops, 248 cm of headroom and about 26 m2 of floor. Doors sit at each end, with side vents as an extra.
Best for: Allotment holders and smallholders who want to grow food under cover all year
What we like
- About 26 m2 of growing space for just over £1,000
- 35 mm tubing stands up to wind and snow better than 25 mm
- Room for beds on both sides and a wide path
What we don't
- Needs a big flat site, and many allotments ask permission first
- Side vents cost extra, and a tunnel this size gets hot without them
Specifications
| Type | Polytunnel |
|---|---|
| Glazing | Plastic cover, 0.2 mm |
| Frame | galvanised high-tensile steel hoops (E370), 35 mm, 5ft or 7ft hoop spacing |
| Size | 14 x 20 ft (4.3 x 6.1 m) |
| Floor area | 26 m² |
| Ridge height | 2.48 m |
| Eaves height | 0.99 m |
| Roof vents | 0 |
| Side vents or louvres | 0 |
| Door | two doors, one at each end (hinged or sliding, chosen in the configurator) |
| Base included | not published |
| Gutters included | No |
| Automatic vent opener | No |
| Snow load | not published |
| Weight | not published |
| Maker's guarantee | not published |
Sources: the maker's specs, specialist retailers and the product page on Amazon.co.uk. If a value is missing, we found it published nowhere.
Score: 3.0 out of 10
Worked out from the specs above. How we score.
First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long: common questions
Is the First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long any good?
With 3 out of 10, the First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long ranks 38 of 38 in our comparison. Strengths: About 26 m2 of growing space for just over £1,000, 35 mm tubing stands up to wind and snow better than 25 mm. Weakness: Needs a big flat site, and many allotments ask permission first. Best for: Allotment holders and smallholders who want to grow food under cover all year.
How big is the First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long?
It measures 14 x 20 ft (4.3 x 6.1 m), which gives you 26 m² of floor space. The ridge stands 2.48 m high.
Does the First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long need a base?
Yes, plan for one. Our data shows no base frame in the box, and without proper anchoring a strong gust can lift a light greenhouse.
What guarantee comes with the First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long?
We found no maker's guarantee. You still have your statutory rights under the Consumer Rights Act from the retailer.
How much does the First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long cost?
The last price we saw was £1,051, roughly £40 per m². Greenhouse prices often climb in spring, and the retailer shows the current price.
Alternatives to the First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long
A green 8x10 with four vents and double doors
A strong aluminium 8x10 with a built-in base
A proper hoop polytunnel built in the UK
What you will need with it
Kit that plenty of buyers add to their basket. Affiliate links to Amazon.co.uk, how that works.




Head-to-head comparisons
- Elite Belmont 8x10 Greenhouse vs First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long (£1,099 against £1,051)
- First Tunnels 14ft (4.27m) Wide Polytunnel, 20ft long vs Vitavia Jupiter 8300 8x10 (£1,051 against £1,049)