Cost GuidesUpdated May 2026By TradeMatch Editorial Team·7 April 2026·Updated 12 April 2026·5 min read

Decking Costs UK 2026: Timber & Composite Installation

Decking creates an outdoor living space for a fraction of the cost of a patio. Here is what timber and composite decking costs in the UK.

Professional tradesperson completing quality work

Decking Costs by Material

Type	Cost per m² (supply + fit)
Pressure-treated softwood	£60–£100
Hardwood (e.g. balau)	£100–£160
Composite (mid-range)	£100–£150
Premium composite (Trex, Millboard)	£150–£250

A typical 15m² deck costs £900–£1,500 in softwood or £1,500–£3,750 in premium composite, including subframe, fixings and balustrades.

Timber vs Composite Decking

Timber (softwood or hardwood):
- Lower upfront cost
- Natural appearance
- Needs annual treatment (oil, stain or preservative)
- Lifespan: 10–15 years (softwood), 20–30 years (hardwood)
- Can become slippery when wet

Composite:
- Higher upfront cost but lower lifetime cost
- No annual maintenance needed
- Fade-resistant and splinter-free
- Lifespan: 25–30+ years
- Anti-slip surface options available

Composite decking has become the most popular choice for UK homes due to zero maintenance and consistent appearance.

Frequently Asked Questions

Does decking need planning permission?

Not usually — decking under 30cm above ground level falls under permitted development. Raised decking (over 30cm) or decking that significantly increases the footprint of your property may need permission. Check with your local council.

How long does decking take to install?

A standard 15m² deck takes 2–3 days including subframe construction. Larger or more complex designs (multi-level, built-in seating, lighting) may take 4–5 days.