Best Garden Room Cladding Options

Cedar is the benchmark timber cladding for premium UK garden rooms and there's a reason for it. It contains natural oils that resist rot, insects and fungus without preservative treatment — expected lifespan is 30–40 years untreated. Left alone, it silvers to a beautiful driftwood grey over 2–3 years. Treated with UV-stabilising oil every 3–5 years, it holds a warm honey-brown tone indefinitely. It's lightweight, dimensionally stable, and takes fixings well. The downside is cost — cedar cladding is around £45–£75 per m² supplied, roughly double redwood. Also worth knowing: cedar has a small blush of tannin bleed in the first few weeks after installation which can stain lighter surfaces below it.

Larch is the pragmatic alternative to cedar. It's harder and denser, so it's slightly more durable in high-wear situations, and it comes in at roughly 20–30% less than cedar (£35–£55/m² supplied). It also silvers over time but takes slightly longer than cedar to reach that even weathered look, and can show more colour variation in the first year. Thermally-modified larch (heat-treated to improve stability) is a premium version that stays dimensionally rock-steady in wet UK conditions. Larch is a strong choice if you want the natural-timber look without cedar pricing, and you don't mind slightly more variability in early weathering.

Composite boards are engineered from recycled wood fibre bound with plastic. The visual: modern, flat, matte finish in fixed colours (typically charcoal, graphite, oak, walnut). The pitch: near-zero maintenance — no oiling, no silvering, no colour drift. Warranties of 25 years are standard. Fire ratings are typically Class B and better than untreated timber. Cost is comparable to cedar (£50–£85/m² supplied), sometimes higher for premium ranges like Millboard or Cladco Composite. The main downsides: it doesn't look or age like real wood, and it's much heavier than timber, which occasionally affects the substructure design.

uPVC cladding is the budget option — around £20–£30/m² supplied, dead easy to install, virtually zero maintenance, and available in white, grey and wood-effect finishes. It works, but it never really passes for premium — the finish can look plastic close up and colour can fade over 10–15 years, particularly on south-facing walls. For a workshop, cabin or utility building where budget matters more than kerb appeal, uPVC is a sensible choice. For a garden room that's meant to look like a considered part of your home, we'd almost always suggest timber or composite instead.

Metal cladding — usually zinc, aluminium or coated steel in standing-seam or vertical-cassette systems — has become the go-to for contemporary architectural garden rooms. It's crisp, low-maintenance, and pairs well with timber accents on windows or entry walls. Zinc develops a soft protective patina over time and can last 60+ years; aluminium is lighter and often cheaper. Costs are the highest of any option — expect £60–£110/m² supplied, plus specialist installation. It's the right choice if the design intent is modern rather than natural.

Render is unusual on garden rooms but sometimes used to match a rendered main house. Modern silicone-based renders are self-cleaning, colour-fast, and last 20–30 years with no maintenance. They're applied over a mesh-backed insulation board so they add insulation performance as well as finish. Cost is comparable to composite (£55–£85/m² fully applied). The look works particularly well on contemporary boxy garden rooms where a single-colour flat facade is the design intent.

Rough annual time investment over a 20-year life:
• Composite / uPVC / metal — under an hour a year (a rinse-down)
• Rendered — under an hour a year for silicone; a re-paint every 10–15 years for basic render
• Cedar or larch, left to silver — under an hour a year
• Cedar or larch, oil-maintained — a half-day every 3–5 years to clean and re-oil

If maintenance genuinely matters to you, choose composite or metal. If you love natural materials and don't mind an occasional afternoon with a paintbrush, timber wins on character.