The Real Cost of Composite Decking in the UK: 2026 Price Guide
The Short Answer
In 2026, UK composite decking costs typically fall between £45 and £110 per square metre for boards alone, with full supply-and-fit installations running from £130 to £230 per square metre. The total depends on board grade, sub-frame requirements, site access, and finishing details.
Composite Decking Board Prices by Grade
Entry-level uncapped composite: £30-£50/m². Mid-range capped composite: £50-£75/m². Premium co-extruded capped composite: £75-£110/m². Luxury ranges with deep embossing and 25-year warranties: £110-£150/m². For UK weather, mid-range capped or higher is where to start - entry-level uncapped struggles long-term.
What You Pay For Beyond the Boards
Sub-frame timber or aluminium joists: £15-£30/m². Joist hangers, fixings, and clips: £4-£8/m². Membrane and gravel below: £6-£12/m². Fascia boards and step nosings: £10-£25 per metre. End caps and trims: £5-£15 per metre.
Labour Costs in 2026
A professional decking fitter in the UK typically charges £35-£60 per hour, or £200-£400 per day. Most teams quote per project. As a guide, a standard 20m² rear-garden deck on a flat lawn takes 2-3 days to install for a team of two, plus a day for any groundworks.
Full Project Cost Examples
Small balcony or pad (5m²): £700-£1,400 supplied and fitted. Typical garden deck (20m²): £2,600-£4,600 supplied and fitted. Large entertaining deck (40m²): £5,200-£9,200 supplied and fitted. Multi-level deck with steps and balustrades (50m²+): £8,500-£15,000+.
What Makes a Project More Expensive
Sloping ground requiring posts and concrete footings. Removal of an old timber deck. Poor access for materials (no rear access, narrow side gate). Stairs, multi-levels, and lighting integration. Glass or composite balustrade systems. Larger ground-floor decks above ventilation voids needing additional drainage.
Where to Save Money Sensibly
Choose a mid-range capped composite over premium - the performance difference is small. Use timber joists rather than aluminium (still 25-year viable if treated). DIY the simpler elements like fascia trims and step nosings. Buy slightly more board than you need - returns are easier than waiting on a re-order mid-project.
Where Not to Cut Corners
Don't skip the membrane and gravel layer under the deck. Don't reduce joist spacing below the manufacturer's spec (it causes long-term sag). Don't buy boards without a UK distributor and warranty. Don't choose hollow uncapped boards for permanent outdoor use in the UK climate.
