SteelRoot Climber 2.10m Narrow Polycarbonate Greenhouse
A 2.10m-wide narrow galvanised-steel arch greenhouse with twin-wall polycarbonate, for plots where wider models will not fit.
A 2.10m-wide narrow galvanised-steel arch greenhouse with twin-wall polycarbonate, for plots where wider models will not fit.
01Width
02Ridge height
03Length
04Glazing
4 mm is the base specification; choose 6 mm for extra stiffness and warmth.
05Arch spacing
1.0 m is the standard spacing; choose 0.67 m for more exposed plots.
06Add-ons optional
SteelRoot Climber 2.10 Galvanised Steel Greenhouse, Narrow Arch, Twin-Wall Polycarbonate, Walk-In
A 2.10m-wide narrow galvanised-steel arch greenhouse with twin-wall polycarbonate, for plots where wider models will not fit.
Your build
A 2.10m-wide narrow galvanised-steel arch greenhouse with twin-wall polycarbonate, for plots where wider models will not fit.
Structure
Included · already in the price
Delivery
Delivery to the UK mainland is included in the price. A few places carry a surcharge because the pallet network charges us for them. Check yours before you order: the figure shown is the one checkout uses.
2 of 4 · Base & fixings · SteelRoot
Plan the base for your selected greenhouse. Check the frame footprint and base size before preparing your site.
Peg the outer line and check both diagonals.
Most common mistake first. Tap one for why, with photos.
Waldenhaus SteelRoot · narrow arch
Built tall, for climbing crops.
Catalogue I · Components
Twelve cards, every spec, no marketing puff. Click any card to open the file.
01
Five lengths from 4 m (8.40 m²) to 12 m (25.20 m²). The 2.10 m width gives you two full growing rows plus a working path, equivalent to a small allotment plot in your own back garden.
2.30 m at the convex ridge, so you stand fully upright down the centre aisle. For three growing rows plus walkways, see the SteelRoot 4 m line (16.0–48.0 m²).
02
The 1 m spacing is the standard base specification. The optional 0.67 m close-arch layout adds more arch-to-panel fixing lines and shortens unsupported panel spans.
Wind and snow performance cannot be reduced to one headline number. Site exposure, soil or base type, anchoring and the selected configuration all matter. For coastal, upland or otherwise exposed plots, send us the postcode and site photographs before ordering.
03
Ground anchors are supplied with the greenhouse. A concrete foundation is not required for a standard soil installation, but the site must be firm and level; a prepared foundation or base is recommended for the best long-term alignment. Use suitable fixings for concrete or another hard base and follow the assembly manual.
Loose, made-up or unusually exposed ground may require a different fixing approach; contact us before ordering if you are unsure.
04
Entry-tier aluminium greenhouses tend to lose panels in moderate UK wind because of their spring-clip glazing. Those clips can corrode, lose tension, and release.
SteelRoot panels are mechanically screw-fixed to the steel frame with stainless screws and EPDM washers. The optional 0.67 m close-arch spacing reduces the panel flex that loosens fixings over time. With no spring clips, there's no spring-clip failure mode.
05
Wax-cylinder roof auto-vents are an optional add-on, not part of the base kit. Each opener pushes its vent open from around +18 °C and is fully closed by around +12 °C, so the greenhouse ventilates itself while you are away. No power, no battery, no manual handle.
Choose the number that suits your site on this page, £99 each — up to one vent per 2 m of length (two on the 4 m build, six on the 12 m). The base SteelRoot already opens front and back: both arched doors have an opening upper section for cross-flow.
06
You choose the thickness at checkout. 4 mm is the base specification: lowest cost and lightest, with enough light transmission for a full crop.
6 mm is the upgrade option: stiffer between supports, more impact-resistant and warmer. Both are UV-stabilised and screw-fixed at every edge with stainless screws and EPDM washers. Choose 6 mm when extra stiffness or thermal retention matters more than the lowest entry price.
07
Self-assembly · pre-drilled, bolt-assembled · common hand tools. Assembly time depends on the selected size, site preparation, weather and the people carrying out the work.
Prepare a firm, level base and review the assembly manual before starting. Two adults are recommended.
08
You choose the arch spacing at checkout. SteelRoot's base specification uses 1 m arch spacing. The optional 0.67 m close-arch layout adds more support ribs along the length for more exposed plots.
Shorter spans reduce polycarbonate panel deflection and reduce frame racking under lateral wind load. Stand inside a SteelRoot at 0.67 m and count the ribs over your head. That is the engineering you can see.
09
40 × 20 mm closed rectangular hollow section, galvanised steel with ZAM coating (zinc-aluminium-magnesium). The closed tube resists twist as well as bend, where an open profile flexes more readily under lateral load because it cannot resist torsion in the same way.
Every frame hole is pre-drilled for bolt assembly. Inspect fixings and any damaged coating during routine maintenance rather than drilling new holes after installation.
10
Every SteelRoot ships with an opening window in each arched door, two per kit. Both stable doors have an upper section that swings open on its own hinge.
That adds intake for the prevailing wind and gives cross-flow through the length of the structure, rather than only venting up and out at the apex.
11
The assembly manual identifies the components used in the selected SteelRoot greenhouse.
If you need a replacement, contact us with your order number, the component code and a photograph. Availability, price and despatch timing are confirmed for each request.
12
SteelRoot is supplied for self-assembly with pre-drilled frame components. Assembly time depends on the selected size, site preparation, weather and the people carrying out the work.
Prepare a firm, level base and review the assembly manual before starting. Two adults are recommended.
Gallery · SteelRoot Climber
1 / 8
Why we engineer it this way
Ten rows put SteelRoot next to two category alternatives: the entry-tier aluminium polycarbonate greenhouse and the polythene polytunnel, without naming brands. The aim here is to show why we made these specific engineering choices for British weather, rather than to rank one product above another.
Comparison points reflect typical category specs. Individual brands within each category may exceed these defaults, we encourage detailed comparison with any specific product you're considering.
Pick the length,
not the compromise.
Free delivery to most UK mainland postcodes. Any postcode surcharge is calculated from the delivery postcode and shown before checkout.
Free delivery to most UK mainland postcodes. Any postcode surcharge is calculated from the delivery postcode and shown before checkout.
Free delivery to most UK mainland postcodes. Any postcode surcharge is calculated from the delivery postcode and shown before checkout.
Free delivery to most UK mainland postcodes. Any postcode surcharge is calculated from the delivery postcode and shown before checkout.
Free delivery to most UK mainland postcodes. Any postcode surcharge is calculated from the delivery postcode and shown before checkout.
Free delivery to most UK mainland postcodes. Any postcode surcharge is calculated from the delivery postcode and shown before checkout.
Tighter than they have to be.
67 cm
Arch spacing · 1 m standard, 0.67 m close-arch option
Choose the 1 m standard arch spacing, or the 0.67 m close-arch option with 50% more support ribs along the length. The close-arch option shortens unsupported panel spans for more exposed plots.
1 m is the standard arch spacing. 0.67 m is the close-arch option.
Closed-section frame
40 × 20 MM RHS
Galvanised steel rectangular hollow section
The closed rectangular profile resists both bending and twisting. Every arch is pre-drilled for bolt assembly and finished with ZAM coating (zinc-aluminium-magnesium).
Frame profile specification applies to SteelRoot Climber 2.10.
The build
DETAIL · FRAME COATINGWhere rust starts
SteelRoot uses galvanised steel with ZAM coating (zinc-aluminium-magnesium) for corrosion protection. The exact coating chemistry is published in the product specification.
Every frame hole is pre-drilled. Inspect fixings and any damaged coating during routine maintenance rather than drilling new holes after installation.
ZAM coating (zinc-aluminium-magnesium)
DETAIL · PRE-DRILLED ARCH × BOLTWhere install starts
Marking and drilling a frame on site is where amateur kits go wrong: the gap doesn't match, the panel won't seat, and an afternoon turns frustrating.
Every SteelRoot frame is pre-drilled in a fixed jig, with tolerances to a millimetre. You bolt the frame through those holes; the panels and brackets go on with self-drilling screws, which cut their own hole where the manual shows. Panels fit on first assembly.
Factory pre-drilled frame · jig-controlled tolerance · self-drilling screws for the panels
Published warranty terms
10 yr
2-year manufacturing defect warranty on cellular polycarbonate panels + 10-year anti-corrosion warranty on the galvanised steel frame
2-year manufacturing defect warranty on cellular polycarbonate panels + 10-year anti-corrosion warranty on the galvanised steel frame.
Read the full coverage, exclusions and claim process on the warranty page before ordering.
Full warranty terms and exclusions apply.
Delivery · from order to your door
1–4 weeks
Free delivery to most UK mainland postcodes
Free delivery to most UK mainland postcodes. Any postcode surcharge is calculated from the delivery postcode and shown before checkout.
Isle of Wight £49 · Scottish Highlands £79 · Northern Ireland £99 · Scottish Islands £149. Isle of Man: contact us before ordering. Channel Islands, Isles of Scilly and BFPO are not served.
Delivered in 1–4 weeks from order, kerbside, by a tail-lift vehicle. Contact us before ordering if access is restricted.
Highland / Outer Hebrides / Northern Isles, please contact us before ordering for delivery quote
Direct despatch
PRE-DRILLEDBuilt
The pre-drilled frame components, fixings and ground anchors are supplied as a labelled palletised order. Check the packing list before assembly.
40 × 20 mm RHS galvanised steel · pre-drilled · hand-packed
PALLET · 65 KG (4 M) / 105 KG (12 M)Crated
The order is strapped and wrapped for pallet transport. Packing method and pallet count can vary by model and selected configuration.
Palletised order · packing varies by configuration · kerbside delivery
ON YOUR KERB · TAIL-LIFT DROPDelivered
The carrier delivers to the agreed kerbside point. Check the packaging and supplied packing list before moving the components to the build site.
Photograph visible damage and report any discrepancy to support with your order number.
Tail-lift kerbside drop · labelled parts box
Not disposable
Every SteelRoot component is documented, coded and replaceable. Email us with a part code or a photo · we'll source the matching replacement part for it.
Long-term parts continuity · documented SKUs, not a discontinued batch
Not sure which length?
Find your size in 60 seconds.
Three quick questions about how you'll use it, and we'll match you to the right SteelRoot length with the spec rationale and total cost.
No greenhouse is guaranteed against every weather event. Site exposure, base type, anchoring, glazing and arch spacing all affect performance. Contact us before ordering for a coastal, upland or otherwise exposed plot.
The product warranty is: 2-year manufacturing defect warranty on cellular polycarbonate panels + 10-year anti-corrosion warranty on the galvanised steel frame. See the full warranty terms before ordering.
1.0 m is the standard arch spacing. The 0.67 m close-arch option adds more frame-to-panel intersections along the length, so unsupported polycarbonate spans are shorter and panel movement is reduced.
Choose 1.0 m for the base specification, or 0.67 m when your site is more exposed or you want the shorter-span build. Correct anchoring and ground conditions still matter in either configuration.
SteelRoot is supplied for self-assembly with pre-drilled frame components. Assembly time depends on the selected size, site preparation, weather and the people carrying out the work.
Prepare a firm, level base and review the assembly manual before starting. Two adults are recommended.
Ground anchors are supplied with the greenhouse. A concrete foundation is not required for a standard soil installation, but the site must be firm and level; a prepared foundation or base is recommended for the best long-term alignment. Use suitable fixings for concrete or another hard base and follow the assembly manual.
Loose, made-up or unusually exposed ground may require a different fixing approach; contact us before ordering if you are unsure.
The frame specification is 40 × 20 mm rectangular hollow-section galvanised steel with ZAM coating.
The product warranty is: 2-year manufacturing defect warranty on cellular polycarbonate panels + 10-year anti-corrosion warranty on the galvanised steel frame. See the full warranty terms before ordering.
Both are offered, and you pick at checkout. 4 mm is the base specification: lowest cost, lightest, and it grows a full crop. 6 mm has larger cellular flutes and thicker walls than 4 mm — it is stiffer between supports, retains more heat, and gives more body against hail and falling debris. It also flexes less than the 4 mm panel.
Choose 4 mm if you want the lowest entry price. Choose 6 mm when extra stiffness, impact resistance or thermal retention matters more than the lowest price.
Cross-ventilation is standard on every SteelRoot: both arched doors are two-part stable doors, and the upper section opens independently as a cross-flow door window, giving two opening points on every model. Wax-cylinder roof auto-vents are an optional add-on (£99 each) that open around 18°C and close around 12°C on their own.
For Cornish or Mediterranean-style heat exposure, side-louvre or end-vent kits are a planned accessory. If your site is south-facing and bakes from June to September, a roll-down shading kit (sold separately) covers the gap.
SteelRoot Climber 2.10 wide footprints, in real growing language:
4 m / 8.40 m²: two full-size raised beds plus a working path; quarter-allotment scale.
6 m / 16.62 m²: three raised beds, year-round salad and tomato programme.
8 m / 22.16 m²: small-allotment scale; tomatoes, beans, cucumbers and brassicas under one roof. The most-ordered SteelRoot length.
10 m / 27.70 m²: serious-grower volume with overwintering capacity.
12 m / 25.20 m²: commercial-domestic scale; cut-flower microbusiness viable.
If you're between two lengths, take the longer one. The £150–£200 step is small money compared with rebuilding 18 months in.
Planning requirements depend on the property, location and siting. Height alone does not determine whether permission is required.
Check current Planning Portal guidance and contact your local planning authority before installation if the property is listed, in a conservation area or subject to additional restrictions.
Free delivery to most UK mainland postcodes. Any postcode surcharge is calculated from the delivery postcode and shown before checkout.
Isle of Wight £49 · Scottish Highlands £79 · Northern Ireland £99 · Scottish Islands £149. Isle of Man: contact us before ordering. Channel Islands, Isles of Scilly and BFPO are not served.
Delivered in 1–4 weeks from order, kerbside, by a tail-lift vehicle. Contact us before ordering if access is restricted.
You have 14 days from delivery to start a return, unused, in original packaging. We'll arrange the collection through our carrier. SteelRoot pallets are large, so you pay the carrier collection cost. We'll quote the exact carrier figure on request before you commit. Full terms on our refund policy.
If the structure has been built and you're stuck on something specific, say a wrong size, a delivery damage that surfaced during the build, or a missing part, talk to us first. Most problems sort out short of a full return.
SteelRoot uses standardised component SKUs produced to a fixed spec. Panels are 4 or 6 mm twin-wall polycarbonate, fasteners and brackets are commodity stainless or zinc-plated hardware, and we keep them documented and coded so we can source replacements rather than re-engineering each time.
Replacement parts go through our customer-service team at customer-service rate. SteelRoot is a sub-brand of Waldenhaus, a multi-product UK operator that maintains a living parts catalogue. If you bought a SteelRoot in year 1, you can still buy parts for it in year 10.
If provider-backed finance is available for your order, it will be shown at checkout by the payment provider before you commit.
We do not publish manual monthly payment estimates on the PDP because the final offer depends on provider approval and the selected build.
Film polytunnels usually have a lower upfront price, while SteelRoot uses a galvanised steel frame and screw-fixed twin-wall polycarbonate. Compare the full specification, installation requirements, maintenance and replacement parts for your site.
SteelRoot is the rigid-panel option; a film polytunnel may remain the better choice when the lowest initial cost is the priority.
Entry-tier aluminium greenhouses and SteelRoot serve different requirements. Compare the published frame profile, panel-fixing method, anchoring, glazing options and warranty terms rather than the starting price alone.
SteelRoot uses 40 × 20 mm closed RHS galvanised steel, screw-fixed twin-wall polycarbonate and included ground anchors. The base specification uses 4 mm glazing and 1 m arch spacing; 6 mm and 0.67 m close-arch options are available.
Deeper reading
Real engineering numbers, UK planning rules, and honest comparison guides · pick any topic that helps your decision.
The narrowest Waldenhaus galvanised steel arch greenhouse: 2.10 m across, 2.30 m to the ridge, five lengths 4–12 m, from £949, in screw-fixed twin-wall polycarbonate on a ZAM-coated frame.
Compare the line on the SteelRoot range page, or the wider SteelRoot Garden 2.64. Weighing up a polytunnel? Read our polytunnel vs polycarbonate greenhouse guide.
