{"product_id":"steelroot-wide-4m-greenhouse","title":"SteelRoot Wide 4.00 Galvanised Steel Arch Greenhouse, Twin-Wall Polycarbonate, Walk-In","description":"\u003cstyle\u003e\n  .sr-desc { line-height: 1.5; color: rgb(31, 58, 42); }\n  .sr-desc .sr-lead { font-size: 17.5px; font-weight: 700; margin: 0 0 16px; line-height: 1.35; color: rgb(31, 58, 42); }\n  .sr-desc .sr-specs { list-style: none; margin: 0 0 16px; padding: 0; display: flex; flex-direction: column; gap: 9px; }\n  .sr-desc .sr-specs li { display: grid; grid-template-columns: 96px 1fr; gap: 14px; align-items: baseline; font-size: 15px; line-height: 1.45; color: rgba(31, 58, 42, 0.85); }\n  .sr-desc .sr-k { font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 11px; font-weight: 700; letter-spacing: 0.09em; text-transform: uppercase; color: rgba(31, 58, 42, 0.5); }\n  .sr-desc .sr-promise { font-size: 14.5px; line-height: 1.5; margin: 0; color: rgba(31, 58, 42, 0.72); padding-top: 12px; border-top: 1px solid rgba(31, 58, 42, 0.12); }\n  .sr-desc .sr-promise strong { color: rgb(31, 58, 42); font-weight: 700; }\n  @media (max-width: 480px) { .sr-desc .sr-specs li { grid-template-columns: 84px 1fr; gap: 10px; } }\n\u003c\/style\u003e\n\u003cdiv class=\"sr-desc\"\u003e\n  \u003cp class=\"sr-lead\"\u003eThe widest SteelRoot — a 4.00 m galvanised-steel arch greenhouse, engineered for the British storm season.\u003c\/p\u003e\n  \u003cul class=\"sr-specs\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"sr-k\"\u003eFrame\u003c\/span\u003e\u003cspan\u003eClosed 40 × 20 mm RHS steel, ZAM coating (zinc-aluminium-magnesium)\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"sr-k\"\u003eGlazing\u003c\/span\u003e\u003cspan\u003eScrew-fixed twin-wall polycarbonate, 4 mm standard, 6 mm option\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"sr-k\"\u003eArch\u003c\/span\u003e\u003cspan\u003e1.0 m standard arch spacing; 0.67 m close-arch option\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"sr-k\"\u003eFoundation\u003c\/span\u003e\u003cspan\u003eGround anchors are standard, so no concrete foundation is required. For extra stability, we recommend a firm, level base.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"sr-k\"\u003eIncluded\u003c\/span\u003e\u003cspan\u003eGround anchors and rear-window cross-ventilation\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"sr-k\"\u003eOptional\u003c\/span\u003e\u003cspan\u003eRoof auto-vents; Solid Extension Module (+2 m)\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp class=\"sr-promise\"\u003e\u003cstrong\u003eFree UK mainland delivery\u003c\/strong\u003e, typically within 1–4 weeks. Backed by our published frame and panel warranty.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sr-desc\"\u003e\n\u003ch3 style=\"font-size:18px;font-weight:700;margin:28px 0 14px;color:rgb(31,58,42);\"\u003eAbout the SteelRoot Wide 4.00 arched polycarbonate greenhouse\u003c\/h3\u003e\n\u003cp\u003eThe Wide 4.00 is the widest greenhouse in the SteelRoot range: 4.00 m across and 2.30 m to the ridge, on the same closed galvanised steel arch as the rest of the line, in rectangular hollow-section tube, clad in screw-fixed twin-wall polycarbonate in your choice of 4 or 6 mm. The extra width is the point — enough to run staging down both sides and still wheel a barrow up the middle, or to set three growing rows where a narrower house takes two. Screw-fixed panels stay seated where spring clips work loose, and the closed steel sections shed water instead of trapping it.\u003c\/p\u003e\n\u003cp\u003eFive lengths share one width and arch profile, so you choose by how you grow. The shortest, at 4 m and 16 m², suits a generous private garden that wants real walk-around space and full standing headroom. The middle lengths carry a season of tomatoes, cucumbers and overwintering pots for a busy household plot, with room to work down both sides. The longest runs, up to 12 m and 48 m², give an allotment or a market garden a full bench either side and a clear central path, engineered for the British storm season across every size.\u003c\/p\u003e\n\u003cp\u003eIt suits serious growers and shared plots that have the ground for a wider house and want to use every inch of it: keen gardeners moving up from a narrower frame, allotment holders working both sides, and anyone who would rather fit panels with a screwdriver than chase loose glass after a gale. Ground anchors are standard, so no concrete foundation is required. For extra stability, we recommend a firm, level base.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003csection class=\"wh-seo-block wh-steelroot-seo-architecture\"\u003e\n  \u003ch2\u003eSteelRoot Wide 4.00 arched polycarbonate greenhouse: the quick answer\u003c\/h2\u003e\n  \u003cp\u003eThe SteelRoot Wide 4.00 is the widest Waldenhaus galvanised steel arch greenhouse for growers who want a larger, practical structure without a film-cover replacement cycle. It is 4.00 m across and 2.30 m to the ridge, with a frame of 40 × 20 mm RHS galvanised steel with ZAM coating (zinc-aluminium-magnesium), screw-fixed twin-wall polycarbonate (4 mm standard, 6 mm option) and a modular arched form for serious growing space.\u003c\/p\u003e\n  \u003cp\u003eUse this product page for the Wide 4.00 specification and ordering details. Use the \u003ca href=\"\/collections\/steelroot\"\u003eSteelRoot greenhouse range page\u003c\/a\u003e to compare the line, lengths and configuration choices, or see the \u003ca href=\"\/products\/steelroot-3-14m-galvanised-steel-arch-greenhouse\"\u003enarrower SteelRoot Plot 3.14\u003c\/a\u003e side by side. If you are arriving from a polytunnel search, start with the comparison logic in our \u003ca href=\"\/blogs\/news\/polytunnel-vs-polycarbonate-greenhouse-uk\"\u003epolytunnel vs polycarbonate greenhouse guide\u003c\/a\u003e.\u003c\/p\u003e\n\n  \u003ch3\u003eWide 4.00 search questions\u003c\/h3\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eHow wide is the SteelRoot Wide 4.00?\u003c\/dt\u003e\n    \u003cdd\u003e4.00 m across and 2.30 m to the ridge — the widest in the SteelRoot range, with room for staging both sides and a clear central path, available in five lengths from 4 m (16 m²) to 12 m (48 m²).\u003c\/dd\u003e\n    \u003cdt\u003eIs it a galvanised steel greenhouse?\u003c\/dt\u003e\n    \u003cdd\u003eYes. The frame is galvanised steel with ZAM coating (zinc-aluminium-magnesium). We do not use grade-specific public coating claims without a mill certificate; the customer-facing proof point is the coating type.\u003c\/dd\u003e\n    \u003cdt\u003eIs 6 mm polycarbonate standard?\u003c\/dt\u003e\n    \u003cdd\u003eNo. The Wide 4.00 uses 4 mm twin-wall polycarbonate as the standard\/base configuration, with 6 mm available as a glazing option. We lead with the material and fixing method rather than putting millimetres in the page title.\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e","brand":"Waldenhaus","offers":[{"title":"13 × 14 ft","offer_id":54383328887126,"sku":"SRG-4-04","price":1049.0,"currency_code":"GBP","in_stock":true},{"title":"13 × 20 ft","offer_id":54383328919894,"sku":"SRG-4-06","price":1299.0,"currency_code":"GBP","in_stock":true},{"title":"13 × 26 ft","offer_id":54383328952662,"sku":"SRG-4-08","price":1549.0,"currency_code":"GBP","in_stock":true},{"title":"13 × 33 ft","offer_id":54383328985430,"sku":"SRG-4-10","price":1799.0,"currency_code":"GBP","in_stock":true},{"title":"13 × 40 ft","offer_id":54383329018198,"sku":"SRG-4-12","price":2049.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0966\/5380\/3862\/files\/wh-wide-gal-1-hero_4714a494-bbc2-4819-8266-784e0dd05d3b.jpg?v=1782816960","url":"https:\/\/waldenhaus.uk\/products\/steelroot-wide-4m-greenhouse","provider":"waldenhaus","version":"1.0","type":"link"}