SteelRoot Brochure — The Galvanised-Steel Greenhouse, Fully Specified

The fourth option.

Serious British growers have had three structures to choose from — none of them right.

A polycarbonate aluminium box from the garden centre that twists in the first proper storm. A polytunnel whose film is a consumable — it perishes at the hoops every few seasons and ends up in landfill. Or a heritage glasshouse priced at £8,000 and up, which puts the conversation out of reach for most growers.

SteelRoot is the fourth option. A modular galvanised-steel arch greenhouse, built for the British weather you actually get, sold at the price a serious grower can reach. From 12.6 m² up to 37.7 m² of year-round growing space, on a closed-section steel frame with no organic material to rot — extendable in 2 m steps as your growing ambition develops.

We don't claim it is storm-proof, because no greenhouse can stand behind that absolute. We tell you how it is built instead, and let the construction answer the question.

• Modular galvanised-steel arch — built once, grown into for a decade.
• Engineered for Yorkshire wind, not a Continental display garden.
• Manufactured by a workshop with over 20 years of greenhouse-making expertise.
• Engineered for British weather, made in the EU — 0% UK customs duty, no tariff premium passed to you.
• One of three Waldenhaus lines, alongside the NORDIC timber range and OBLO / CUBIO saunas.

Structure, not adjectives.

Wind performance is not about mass — it is about structure plus correct anchoring. SteelRoot answers the British storm season with four working mechanisms, not an adjective.

The frame is closed 40 × 20 mm rectangular hollow-section galvanised steel. A closed box section resists twist as well as bend — the failure mode that takes out open C-section aluminium frames in moderate wind. The arches sit at 0.67 m spacing: roughly a third closer than the 1.0 m Continental default, which means more arches per metre, more grid intersections holding the glazing, and less flex under load. We retail only the 0.67 m configuration in the UK, because that is the engineering decision British weather demands.

The glazing is screw-fixed to the frame with stainless screws and EPDM washers — not held in spring W-clips, which is exactly why cheap aluminium houses lose panels in a gust. And every SteelRoot ships with ground anchors, scaled to the length, so the structure is held to the ground from day one. No concrete pour, no skip hire, no setting time. Correct anchoring per the included guide is part of the wind performance — which is why the anchors are in the box, not on a separate order line.

• Closed 40 × 20 mm RHS galvanised steel — resists twist as well as bend.
• 0.67 m close-arch spacing — about 33% closer than the Continental 1.0 m default.
• Screw-fixed glazing with stainless screws and EPDM washers — no spring clips to pop out.
• Ground anchors included, scaled to length — no concrete, no setting time.
• ZAM coating (zinc-aluminium-magnesium) on the steel frame.

The spec, in plain sight.

We put the specification on the page, not in a PDF you only open after a problem. This is the SteelRoot 3.14 m line as it ships.

• Frame: closed 40 × 20 mm rectangular hollow-section galvanised steel, ZAM coating (zinc-aluminium-magnesium), pre-drilled and bolt-assembled — no welding or cutting on site.
• Arch spacing: 0.67 m — the only configuration we retail in the UK.
• Glazing: 6 mm twin-wall cellular polycarbonate (CrystalLight), UV-stabilised top layer, covering roof, walls and gables.
• Glazing fixing: screw-fixed to the frame with stainless screws and EPDM washers — no spring clips.
• Anchoring: ground anchors included as standard, scaled to the greenhouse length.
• Ventilation: automatic roof vents fitted as standard (wax-cylinder openers, factory-calibrated to open at ~18°C), plus opening door windows in both gable doors for cross-flow.
• Doors: two-part stable doors front and rear — upper and lower sections open independently, each upper section held back on a cabin hook.
• Ridge: 2.02 m, convex profile for maximised internal volume.
• Assembly: two adults, pre-drilled and bolt-assembled, typically one day (4 m) to three days (12 m); cordless drill, spanner set, spirit level and step-ladder.

Five lengths, one system.

The SteelRoot 3.14 m line comes in five lengths, all 3.14 m wide and 2.02 m to the ridge. Start where your plot is today; extend in 2 m steps later when your growing ambition outgrows the footprint.

To picture the space: 12.6 m² is roughly two full-size raised beds with a working path — a quarter-allotment plot. 25.1 m² is the working footprint of a small allotment. 37.7 m² is generous all-season growing for a serious household, with surplus to give away. Standard UK mainland delivery is included in every price, and V12 0% finance over 12 months is available at checkout.

• All prices include free UK mainland delivery.
• Two adults can build it — pre-drilled, bolt-assembled, no specialist tools.
• Extendable in 2 m steps later — same arch geometry, same 6 mm polycarbonate, same anchoring system.
• 0% APR over 12 months via V12 Retail Finance available at checkout.

All five lengths share the same 3.14 m width and the same 2.02 m ridge. Only the length changes — and the room to grow. If you are between two lengths, most growers later wish they had gone longer.

Room to grow, properly.

Inside the 3.14 m width you get two full growing rows and a central working path, with 2.02 m of headroom at the ridge.

Tomatoes, beans, cucumbers and brassicas in one structure; raised beds down each side; a path you can actually push a barrow along. It is the permanent growing space the allotment waiting list won't give you — in your own back garden, this season.

And because the polycarbonate is permanent, there is no film to replace, no re-trenching weekend every few years, no cover shredded in a named storm. One structure, built once.

• Two growing rows plus a central working path.
• 2.02 m headroom at the ridge — stand and work upright.
• 6 mm twin-wall polycarbonate: roughly 33% better thermal retention than 4 mm.
• No film, no replacement cycle, no annual cover cost.

Free to your kerb.

Free UK mainland delivery is included in the price — typically one to two weeks from order.

Your SteelRoot arrives as a secure pallet, delivered kerbside by pallet truck, so do check your access. The courier sends a notification the day before with a delivery window. For the Highlands, Outer Hebrides and Northern Isles, please contact us before ordering so we can quote delivery correctly.

Assembly is a two-adult job: the components are pre-drilled and bolt-assembled, with a build-along video in your order pack. Plan on roughly one day for the 4 m length, up to three days for the 12 m. You'll need a cordless drill, a spanner set, a spirit level and a step-ladder — no concrete, no specialist contractor for typical UK soil. If anything arrives damaged or a part is missing, photograph it within 48 hours of delivery and email us — we'll ship the replacement part at no charge.

• Free UK mainland delivery, typically 1–2 weeks.
• Kerbside pallet delivery — check your access.
• Highlands / Outer Hebrides / Northern Isles: contact us for a delivery quote before ordering.
• Two adults, pre-drilled and bolt-assembled, ~1 day (4 m) to ~3 days (12 m).
• Damage or missing parts: photograph within 48 hours and email us — replacement parts shipped at no charge.

Founding Owners — £200 off the first 20.

SteelRoot is launching, and we're opening it with a Founding Owners offer: £200 off your first SteelRoot for the first 20 owners — a launch offer on top of the standard RRP, not the base price.

• £200 off your first SteelRoot — first 20 owners.
• A launch offer, applied on top of the standard RRP — not the base price.
• In exchange: share your build-along and after-storm photos with the community, so future buyers see real SteelRoots in real British gardens, not stock images.

Questions, answered

1. Will it survive a real Yorkshire or coastal winter?

   The galvanised steel arch, 0.67 m close-arch spacing, screw-fixed 6 mm polycarbonate and included ground anchors are engineered to perform in typical UK wind and snow exposure when correctly anchored. For exceptional sites — Outer Hebrides, NW Scotland coast, Pennine summits, Shetland — please contact us before ordering. We don't claim "storm-proof", because no greenhouse can stand behind that absolute.

2. Do I need planning permission?

   Usually not. The 2.02 m ridge sits comfortably under the 2.5 m boundary cap that defines Permitted Development for most UK domestic plots. Check with your council if you're in a conservation area, in a listed building, siting closer than 2 m to a boundary, or your outbuildings exceed 50% of the garden. A plain-language checklist is in your order pack.

3. How long does assembly take?

   Two adults, pre-drilled and bolt-assembled: roughly 1 day (4 m), 2 days (6–8 m), 3 days (10–12 m). You'll need a cordless drill, spanner set, spirit level and step-ladder. No concrete for typical UK soil. A build-along video is in your order pack.

4. Can I extend it later?

   Yes. A Solid Extension Module adds 2 m of length using the same arch geometry, the same 6 mm polycarbonate and the same anchoring system. Order it with your SteelRoot or later; installation means opening up the rear gable — typically a half-day for two adults.

5. How is it different from a polytunnel?

   Polytunnel practicality with greenhouse permanence — and no film to replace. SteelRoot uses permanent 6 mm twin-wall polycarbonate on a closed steel arch with screw-fixed glazing; a polytunnel uses tensioned polythene film that's replaced every few years and can lift in a named storm. SteelRoot is one capex; the polytunnel is lower upfront plus a recurring cover cycle.

6. How is it different from a cheap aluminium greenhouse?

   Different category. Entry-tier aluminium houses twist in moderate wind, lose spring-clipped panels and bury "extreme weather" exclusions in their T&Cs. SteelRoot uses closed galvanised steel, screw-fixed glazing, included anchoring and a warranty published before you order. You pay more than the cheap entry — and you don't pay it again every storm season.

7. Is there a finance option?

   Yes — 0% APR over 12 months via V12 Retail Finance, with a soft credit check and a decision in minutes at checkout. PayPal Pay Later is also available.

8. What's the difference between SteelRoot and NORDIC?

   Different jobs. NORDIC is a timber-framed greenhouse with 4 mm polycarbonate and a warm, paintable, formal-garden look. SteelRoot is a galvanised-steel arch with 6 mm polycarbonate, built utility-first for serious growing in exposed sites. Both are Waldenhaus; we'll point you to whichever fits your garden.