Timber and steel, built for British weather.

NORDIC is engineered for British winter conditions rather than sheltered from them. The frame is 45 × 45 mm pine from sustainably-managed forests with 1.2 mm galvanised steel angle brackets at every node, including the four corners and the joints between them. CrystalLight 4 mm twin-wall polycarbonate is screw-fixed at every panel edge with EPDM-style washers, so panels stay where they were fitted and don't spring out under flex. Galvanised ground anchors are included and are required for the warranty to remain valid.

The warranty has no "extreme weather" exclusion. Damage during a Met Office Named Storm sits outside cover, and that threshold is published openly rather than buried. Full terms on our warranty page.

Most owners build over one weekend. Realistic times, working at a comfortable pace with breaks:

NORDIC-S 8–12 h · NORDIC-M 10–14 h · NORDIC-L 12–16 h · NORDIC-XL 14–18 h · NORDIC-XXL 16–20 h.

Panels arrive numbered, pre-drilled and grouped by build stage. You'll need a cordless drill, a spanner set, a spirit level and a tape measure. A step-ladder is useful on L, XL and XXL. No concrete, no specialist tools, no builder to pay. If you get stuck, our build-support line is open weekday and Saturday mornings during the install season.

No concrete foundation is required. Galvanised ground anchors are included with every NORDIC and hammer into prepared ground. For extra stability we recommend a firm, level base: paving slabs work well, and compacted gravel or sound wooden decking are fine too. Cheap, quick, and it keeps the frame dead level.

Anchoring is required for the 10-year frame warranty to remain in force: leaving the structure un-anchored is a warranty exclusion. Loose sand or peat may need supplementary anchors, and a plot tilted above roughly five degrees should be levelled first. If your ground is unusual, email support@waldenhaus.uk with a photo before ordering, and we'll tell you what'll actually work.

Swedish pine from sustainably-managed forests, factory pressure-treated to UC3-equivalent standard before despatch. This is pressure-impregnation rather than a surface coat, the same treatment used on agricultural gates. Frame mass runs 95–230 kg packed depending on SKU.

The 10-year anti-rot frame warranty is conditional on re-treating the timber every 2 years with any UK-purchased wood preservative: Cuprinol, Sadolin, Ronseal, supermarket own-brand, whatever's on the shelf. It takes about half a day each visit, and we send a reminder when you're due. Skip the schedule and the cover lapses, though the structure rarely fails in that window. Re-treatment is a precaution rather than a rescue.

CrystalLight 4 mm twin-wall polycarbonate carries a one-sided, co-extruded UV-protective layer on the sun-facing side, giving approximately 90% light transmission at install. The UV layer is moulded into the sheet rather than sprayed on, so it stays put as the panels age.

The polycarbonate panels are covered against manufacturer defects for 2 years from delivery. Full terms on our warranty page. Beyond that, replacement panels are sold cut-to-size by our customer-service team, in standard 4 mm twin-wall polycarbonate you can source anywhere.

Yes, paint to any exterior colour. Sage green, charcoal, cream, Hague blue, whatever your garden's vocabulary wants. Most owners paint at the end of the first growing season once the timber has settled.

Paint on top of the wood preservative, or use a preservative-tinted base coat with paint over it; both approaches work. The 10-year frame warranty holds as long as the timber receives preservative re-treatment every 2 years, under or over the paint. The paint film alone is not classed as preservative, so don't skip the underlying treatment step.

Warm water, a drop of washing-up liquid, a soft cloth or sponge. Avoid abrasive cleaners, solvents and pressure washers: they damage the EPDM washers and can scratch the panel surface. Two cleans a year is plenty for most gardens, late autumn after leaf fall and early spring before serious propagation starts.

Algae on the cellular flutes shows up as a green tinge along the edges in damp seasons. A diluted horticultural cleaner (Citrox or similar, off the shelf at any garden centre) lifts it without harming the polycarbonate.

NORDIC-M (7.8 m² internal floor area) is the most-ordered size by some distance: roughly the working area of a small allotment plot, room for 4–6 tomato plants plus a seed-starting bench. Garden footprints under 50 m² usually land on S or M; 50–150 m² on M or L; over 150 m² on L, XL or XXL.

Among UK greenhouse owners, the most common regret is going too small. If you are between two sizes, take the larger: the £100 step between sizes is small against a year of growing-space regret. The full ladder: S 5.2 m² → M 7.8 m² → L 10.4 m² → XL 13.0 m² → XXL 15.6 m².

For most UK gardens, no. NORDIC's ridge height is 2.30 m across every SKU, comfortably under the 2.5 m UK Permitted Development cap for outbuildings. Eaves height is 1.51 m, which also sits inside the tighter near-boundary rules.

Three situations where you should ring your council before ordering: a listed property, a designated conservation area, or a plot under an Article 4 Direction (mostly urban conservation zones). Allotment sites typically allow timber-frame greenhouses where they ban polytunnels, but check your tenancy. A plain-language Permitted Development guide ships in your welcome pack.

3-4 weeks from order for UK mainland. We confirm a 4-hour delivery window the day before; the pallet arrives on a tail-lift truck, dropped kerbside. NORDIC pallets are 120 × 80 × 150 cm (Euro-pallet format) and weigh 95–230 kg depending on SKU. Plan one or two people to move components from the kerb to the build location.

UK mainland delivery is included in the price. Scottish Highlands, the islands and Northern Ireland have surcharges or limited service, calculated at checkout, or email us before ordering for a tailored quote. Full carrier terms on our delivery policy.

Photograph the damaged part and the pallet packaging within 48 hours of delivery, then email support@waldenhaus.uk with your order number. We ship replacement components at no charge: no forms, no proof-of-handling-fault arguments. We keep spares on hand, so most replacement parts despatch inside 14 working days.

If a panel chips during build because something went wrong at your end, we'll still sell you a replacement at customer-service rate (well below full retail). Either way, send a photo first. It's faster than a phone description.

You have 14 days from delivery to start a return, unused and in original packaging. We arrange the collection through our carrier. Full terms on our refund policy.

If the greenhouse has been built and used, the 14-day return window doesn't apply, but our customer-service team can usually help: repositioning advice, a partial component swap, sometimes a buy-back at a depreciated rate if the structure has to come down. An honest conversation beats a stand-off, and we'd rather sort it than have a 1-star review.

NORDIC is built largely from standard hardware. The CrystalLight panels are 4 mm twin-wall polycarbonate, the brackets are 1.2 mm galvanised steel, and the fixings are commodity stainless or zinc-plated machine screws with EPDM-style washers. Replacement parts go through our customer-service team, at customer-service rate rather than full retail.

Waldenhaus is a multi-product UK brand rather than a single-line operation that can vanish. If we ever change a component spec, we will keep the previous version stocked for owners on the older configuration, so no 8-year-old greenhouse is orphaned because the supplier moved on.

Manual roof vents are included as standard: 1 vent on S and M, 2 vents on L, XL and XXL. The optional SmartVent auto-opener (sold separately) uses a wax-piston mechanism that opens around 22°C and closes around 18°C, with no electricity required, so the structure ventilates itself while you're at work.

For very hot weeks in July and August, the realistic kit is: open vents and doors at sunrise, a shading kit or whitewash if the plot bakes from the south, and a watering can or drip line for floor evaporation. Twin-wall polycarbonate holds heat well in winter and releases it more steadily than single-pane glass; in summer it's still a sun-trap if you ignore it, the same as every other greenhouse on Earth.

They sit in different categories. Entry-tier aluminium polycarbonate kits at £170–£800 use thin extrusion that twists in moderate UK wind, spring W-clip glazing that pops out before the first winter, and warranties that exclude "extreme weather" in the small print. Review sites are full of customers who lost budget twin-wall kits in the £400-900 bracket during named UK storms.

NORDIC's 45 × 45 mm pine frame, 1.2 mm galvanised steel brackets at every node, screw-fixed glazing and included ground anchors are engineered to outlast three replacement cycles of the cheap-aluminium tier. You pay once instead of three times, and you don't wake up to find your seedlings on the neighbour's lawn.