- Board cost per m²: £45–£65 depending on profile — rainscreen at the lower end, tongue and groove mid-range.
- Installed cost per m²: £73–£112 including professional installation at £20–£35/m².
- Typical 30m² elevation: £2,190–£3,360 fully installed.
- Treatment needed: None — naturally Durability Class 3. No preservative ever required above ground.
- Weathering: Weathers from warm reddish-brown to silver-grey in 12–24 months. Develops surface checking — cosmetically harmless. Oil every 3–5 years to maintain colour and reduce checking.
- Availability: In stock UK — typical delivery 7–14 days.
- vs larch: Comparable price, same durability class. Douglas Fir has a richer reddish-warm tone and tighter grain. Larch is warmer gold with more visible knot character.
Douglas Fir cladding has a distinctive look that sets it apart from every other naturally durable UK cladding species — a rich reddish-brown tone, tight and straight grain, and a substantial feel that reads as high quality from a distance. It is Durability Class 3, requires zero preservative treatment, and costs broadly comparably to Siberian larch. This guide gives you the complete cost picture for 2026 — accurate board prices, installation costs, project size comparisons, how it weathers, surface checking explained, whole-life cost versus the alternatives, and how to buy it from UK stock.
Douglas Fir Cladding — Board Prices per m² 2026
We stock Douglas Fir cladding in two profiles, both from UK stock with 7–14 day delivery. Douglas Fir prices have been broadly stable in 2026 — supply from North America and Europe has normalised after the post-2022 volatility and the species is reliably available.
| Profile | Dimensions | Board cost/m² | + Install + fixings/m² | Installed/m² |
|---|---|---|---|---|
| Douglas Fir Rainscreen | 27 x 68mm | £45–£55 | £28–£47 | £73–£102 |
| Douglas Fir T&G V-Joint | 20 x 140mm | £50–£65 | £28–£47 | £78–£112 |
Board prices are ex-works March, Cambridgeshire and exclude VAT. The installation and fixings figure includes 25x38mm treated counter battens, vapour-permeable breather membrane to BS EN 13859, and A4 stainless steel ring-shank nails or screws — never galvanised, which reacts with Douglas Fir's natural tannins. Fire treatment (Euroclass B-s1,d0) adds a further £29.99 per m² where required — see our fire-rated cladding cost guide.
Cost by Project Size — Shed to House Extension
How the numbers translate across typical UK project sizes in 2026, using the rainscreen profile as the baseline:
| Project type | Typical wall area | Materials only | Fully installed | Notes |
|---|---|---|---|---|
| Large garden shed | 10–15m² | £530–£1,025 | £730–£1,530 | DIY feasible — no scaffolding |
| Garden room / studio | 20–35m² | £1,060–£2,275 | £1,460–£3,570 | Single-storey — minimal scaffolding |
| Single storey extension | 20–30m² | £1,060–£1,950 | £1,460–£3,060 | Add scaffolding £600–£1,200 |
| Two storey extension | 35–55m² | £1,855–£3,575 | £2,555–£5,610 | Add scaffolding £1,000–£2,000 |
| Full house elevation | 50–80m² | £2,650–£5,200 | £3,650–£8,160 | Add full scaffolding contract |
How Douglas Fir Cladding Weathers — What to Expect
Douglas Fir weathers differently from Siberian larch and ThermoWood in two ways that are worth understanding before you specify it.
Colour — reddish-brown to silver-grey
Fresh Douglas Fir has a distinctive warm reddish-brown tone — richer and deeper than larch's honey-gold, darker than ThermoWood. Like all naturally durable exterior timber, it weathers through UV-driven photochemical degradation of surface lignin. The colour transition from reddish-brown to silver-grey takes 12–24 months in UK conditions — slightly slower than larch because Douglas Fir's denser resin structure resists surface photodegradation somewhat better. The weathered silver-grey of aged Douglas Fir is attractive and even.
To maintain the reddish-brown colour, apply a UV-stable penetrating oil such as Koopmans Houtolie before installation and every 3–5 years thereafter. As with all naturally durable species, oiling slows but does not permanently stop the weathering process.
Surface checking — what it is and why it matters
Douglas Fir is more prone to surface checking than Siberian larch or ThermoWood. Surface checking is the formation of fine longitudinal cracks along the grain as the timber surface dries and cycles through seasonal moisture changes. It is entirely cosmetic — the cracks are shallow and do not penetrate into the structural timber beneath. They do not affect durability, structural performance, or weather resistance.
The degree of surface checking depends on exposure — south-facing and west-facing elevations with greater UV and drying exposure will check more than shaded north-facing elevations. Oiling every 3–5 years significantly reduces the rate of checking by keeping moisture content more consistent in the surface layers.
Surface checking in Douglas Fir is often mistaken for structural failure by homeowners unfamiliar with the species. The checks are shallow — typically 1–3mm deep — and run with the grain. They are a normal weathering characteristic of this species, not a sign of deterioration. Any timber cladding supplier telling you Douglas Fir is faulty because it checks is incorrect. If your specification requires a surface with less visual checking, Siberian larch or ThermoWood are the alternatives — both check less in comparable exposures.
Douglas Fir Whole-Life Cost — Why No Treatment Matters
Douglas Fir's purchase price is essentially its entire cost of ownership. Durability Class 3 means no preservative treatment is ever required above ground. This translates directly to:
- No annual treatment products or labour
- No scaffolding costs for maintenance on house elevations
- No stripping or preparation cycles
- Optional oiling every 3–5 years — £1–£3 per m² in materials, achievable from a ladder on most single-storey elevations
| Species | Board cost/m² | 30-yr maintenance/m² | 30-yr whole-life/m² | Surface checking |
|---|---|---|---|---|
| Douglas Fir | £45–£65 | £0–£10 (optional oil) | £45–£75 | Moderate — manageable with oil |
| Siberian Larch | £35–£70 | £0–£15 (optional oil) | £35–£85 | Low — less checking than DF |
| ThermoWood | £55–£95 | £0 | £55–£95 | Very low — modification reduces movement |
| Nordic Spruce | £20–£35 | £45–£75 + scaffolding | £65–£110+ | N/A — painted/stained |
Douglas Fir vs Siberian Larch — Which Is Better Value?
Douglas Fir and Siberian larch are the two naturally durable softwoods most directly comparable in the UK cladding market — both Durability Class 3, both no treatment required, both 20–30 year service life, both broadly comparable in price. The decision between them is almost entirely aesthetic:
- Douglas Fir: Rich reddish-brown tone, tight straight grain, fewer visible knots, more surface checking as it weathers. Contemporary and clean-line in appearance. Suits projects where a consistent, architectural surface is the priority
- Siberian Larch: Warm honey-gold, more visible grain movement and knot character, less surface checking. More naturalistic and organic in appearance. Suits projects where visible grain character is preferred
If surface checking concerns you — or if the project is in a highly exposed south or west-facing location where checking would be most pronounced — larch is the more stable choice. If the reddish-warm tone and cleaner grain of Douglas Fir suit the design intent, it will perform comparably for 20–30 years with no other considerations. See our full Douglas Fir cladding buyers guide and timber cladding lifespan guide for the complete species comparison.
Specify Douglas Fir when the reddish-warm tone and tight straight grain suit the project aesthetic — particularly on contemporary buildings where a more uniform, architectural board surface is the intent. Specify Siberian larch when a warmer honey-gold with natural knot character suits the design, or where surface checking in exposed locations would be a concern. Both are available from UK stock at comparable prices with 7–14 day delivery.
How much does Douglas Fir cladding cost in the UK?
Douglas Fir cladding costs £45–£65/m² for boards in 2026. Rainscreen 27x68mm: £45–£55/m². Tongue and groove V-joint 20x140mm: £50–£65/m². Add £8–£12/m² for membrane, battens, fixings and £20–£35/m² installation. Installed total: £73–£112/m². For a 30m² elevation: £2,190–£3,360.
Does Douglas Fir cladding need treating?
No — Douglas Fir is naturally Durability Class 3 and needs no preservative treatment for above-ground exterior cladding. It lasts 20–30 years without treatment. Optional oiling every 3–5 years with Koopmans Houtolie maintains colour and reduces surface checking — but has no effect on structural durability if skipped.
Will Douglas Fir cladding go grey?
Yes — left untreated, Douglas Fir weathers from reddish-brown to silver-grey over 12–24 months. It also develops surface checking (fine grain-direction cracks) which is cosmetically harmless. Oil every 3–5 years to slow both processes and maintain the warm colour. The greying and checking do not affect durability or service life.
Is Douglas Fir cladding more expensive than Siberian larch?
Broadly comparable — Douglas Fir £45–£65/m² versus larch £35–£70/m² depending on profile. Both are Durability Class 3 with no treatment required. The choice between them is primarily aesthetic: Douglas Fir has a reddish-warm tone and tight grain; larch is warmer gold with more visible knot character.
Where can I buy Douglas Fir cladding in the UK?
We supply Douglas Fir cladding in rainscreen and tongue and groove profiles from UK stock with nationwide delivery in 7–14 days. FSC and PEFC certified. Fire treatment to Euroclass B-s1,d0 available on all profiles where required. Contact our team with your wall area for a precise quantity and quote.
Buy Douglas Fir Cladding UK — Stock, Fast Delivery
We supply Douglas Fir rainscreen and tongue and groove cladding from UK stock. FSC and PEFC certified. Fire treatment available. Tell us your wall area for a precise board quantity and quote — nationwide delivery 7–14 days.