How much does decking cost?
Decking is priced by area and material. Enter your deck size below for a region-adjusted installed estimate.
What decking involves
- 1Base and frame
A level, ventilated sub-frame on posts or a solid base carries the boards — the structural part of the job.
- 2Boards and fixings
Softwood, hardwood or composite boards, fixed with a slight gap for drainage and expansion.
- 3Balustrade and steps
Raised decks need balustrades and steps (and sometimes building regs) — factor those in.
Good outside space sells, and a tidy deck extends the living area into the garden in the photos. Composite trims the ongoing maintenance a landlord or buyer would otherwise inherit — worth the premium on the right property.
Decking costs by material (indicative, installed)
| Material | Per m² | Notes |
|---|---|---|
| Softwood timber | £90 – £150 | Cheapest; needs maintenance |
| Hardwood timber | £140 – £220 | Durable, premium look |
| Composite | £150 – £250 | Low-maintenance, long life |
| Typical 20 m² deck | — | £1,800 – £4,400 |
Includes the sub-frame and fixings. Raised decks, balustrades and groundworks add cost.
Frequently asked questions
How much does decking cost?+
Installed decking typically costs £90–£150 per m² in softwood, £140–£220 in hardwood, and £150–£250 in composite — so a 20 m² deck is roughly £1,800–£4,400. Raised decks and balustrades add cost.
Is composite decking worth the extra?+
Composite costs more up front but needs far less maintenance and lasts longer than softwood, which needs regular treating. For a low-maintenance finish on a resale, it often justifies the premium.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.