Allotment Greenhouses
An allotment plot places particular demands on a greenhouse. No permanent concrete base. Rules around maximum size. A structure you may one day need to remove, transport, and re-erect elsewhere. And a site that is often more exposed than a sheltered back garden. Most greenhouses are designed without any of this in mind. The SteelRoot 3.14m is not.
Before you buy any greenhouse for an allotment, check your specific tenancy agreement and your council's site rules. These vary considerably: some sites permit structures up to a certain footprint, others require landlord permission, and a small number prohibit permanent structures outright. We have linked to a plain-English guide to greenhouse rules in the UK to help you start that conversation.
Why allotment growing calls for a different kind of greenhouse
A domestic back-garden greenhouse can sit on a concrete slab for twenty years undisturbed. Allotment growing is different. Tenancy agreements change hands. Plots transfer. Sites close. The ability to dismantle your greenhouse, load it onto a van, and re-erect it elsewhere is not a theoretical advantage - it is something growers on waiting-list sites plan for from the outset.
Polycarbonate matters too. On a shared public site, glass is a liability. A football from the neighbouring plot, a wayward hoe, or deliberate vandalism can produce dangerous shards across a growing area. 6mm twin-wall polycarbonate panels do not shatter. If a panel is damaged, it is replaced as a discrete unit, not cleaned up in fragments.
How the SteelRoot 3.14m meets allotment requirements
| Allotment requirement | How SteelRoot 3.14m meets it |
|---|---|
| No concrete base | Ground Screw Anchors are included as standard. Hand-driven into the ground, they hold the frame without concrete, cement, or excavation. The soil remains undisturbed. |
| Removable and dismountable | Bolt-together modular construction. Two adults can assemble or dismantle the full structure. No welding, no specialist tools. Panel-by-panel removal; anchor extraction leaves no permanent trace. |
| Shatter-safe glazing | 6mm twin-wall polycarbonate panels, screw-fixed with stainless fixings and EPDM seals. Panels flex on impact; they do not shatter. Damaged panels are replaced individually. |
| Walk-in growing space | 2.02m ridge height. Five lengths available: 4m, 6m, 8m, 10m, 12m (floor area 12.56 to 37.80 sq m). Genuine standing room for raised beds, tomato canes, and tall climbing crops. |
| Withstands an exposed, open site | 40x20mm closed RHS galvanised steel arch with ZAM coating (zinc-aluminium-magnesium). 0.67m arch spacing, calibrated to UK wind load requirements. Roof auto-vents included for ventilation on warm days. |
| Self-assembly, no groundwork contractor | All components arrive as a numbered bolt-together system. No welding, no foundations, no planning application required for most domestic footprints. Two adults; standard household tools. |
Specifications at a glance
- Frame: 40x20mm closed RHS galvanised steel · ZAM coating (zinc-aluminium-magnesium)
- Glazing: 6mm twin-wall polycarbonate · screw-fixed with stainless fixings + EPDM seals
- Arch spacing: 0.67m · calibrated to UK wind load requirements
- Ridge height: 2.02m walk-in
- Lengths: 4m · 6m · 8m · 10m · 12m
- Floor area: 12.56 sq m (4m length) to 37.80 sq m (12m length)
- Anchoring: Ground Screw Anchors included as standard · no concrete
- Ventilation: roof auto-vents included · opening door windows included
- From £1,199 · View SteelRoot 3.14m
For home gardens: the NORDIC timber greenhouse
If you are growing at home rather than on an allotment plot, the Waldenhaus NORDIC may suit better. FSC-certified Swedish pine, 45x45mm frame, 4mm twin-wall polycarbonate, walk-in from 8x6 ft through to 8x20 ft. Where a concrete base is not a concern and you want the warmth of a timber frame in a sheltered garden, NORDIC is the right starting point.
Frequently asked questions
Can I put a greenhouse on my allotment?
In many cases, yes - but you must check your specific tenancy agreement and your council or landlord's site rules before purchasing. Rules differ significantly between sites and local authorities. Some permit structures up to a defined footprint without prior approval; others require written permission; a small number restrict permanent structures. Our guide to greenhouse rules in the UK covers the relevant planning and tenancy considerations in plain English.
Do allotment greenhouses need a concrete base?
No. The SteelRoot 3.14m is anchored using Ground Screw Anchors, included as standard, which are driven directly into the ground by hand. No concrete, cement mix, or excavation is required. The soil beneath the greenhouse remains undisturbed, which is particularly important on allotment plots where tenancy agreements frequently prohibit permanent groundworks.
Glass or polycarbonate for an allotment?
Polycarbonate is the better choice for a shared or public plot. Glass can shatter - from a windborne object, an accidental impact, or vandalism - and produces dangerous shards across a growing area. The SteelRoot uses 6mm twin-wall polycarbonate panels, which flex and absorb impact without shattering. If a panel is damaged, it is removed as a single unit and replaced. There are no loose shards.
What size greenhouse fits an allotment plot?
This depends on your specific plot size and your site's rules - always confirm the permitted footprint with your tenancy agreement first. The SteelRoot 3.14m 4m length (12.56 sq m floor area, 3.14m wide) is a practical starting point for allotment use. Growers who have confirmed a larger permitted footprint often choose the 6m or 8m length. The 3.14m width is fixed across all lengths; only the run length varies.
Can the greenhouse be dismantled if I give up the plot?
Yes. The SteelRoot 3.14m is a bolt-together modular system with no welding and no permanent groundworks. Two adults can dismantle the full structure in a day. Panels are removed individually, arches unbolted, and Ground Screw Anchors extracted by hand. The components can be transported by van and re-erected on a new plot or in a home garden.