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Decking - Composite wood – cost per m² – UK 2026 Rate Guide

Budget rate for supply & lay · typical budget rate before your adjustments

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Decking - Composite wood
per m² · supply & lay
£171 – £495 / m²
What is it

Composite wood decking is an external walking surface formed from composite boards fixed to a supporting subframe with proprietary clips, trims and associated fittings.

Rate guide
Standard capped composite boards on treated timber subframe£209 – £286/m²
Entry-grade hollow composite boards on treated timber subframe£171 – £231/m²
Solid composite boards on treated timber subframe£242 – £341/m²
Premium capped or enhanced-grain boards on treated timber subframe£292 – £413/m²
Premium composite boards on aluminium subframe£347 – £495/m²
Labour output
Open rectangular deck with repetitive board runs14–20 m²/day
Typical deck with perimeter trims and limited cutting9–14 m²/day
Irregular layout with steps, mitres or service penetrations5–9 m²/day
Broken-up or access-restricted working area3–6 m²/day
Key rate adjusters
Subframe condition
Providing a new timber subframe rather than fixing to a suitable existing structure typically adds £45–£90/m².
Aluminium support
Substituting aluminium joists and pedestals for treated timber can increase the installed rate by £65–£140/m².
Board specification
Moving from hollow entry-grade boards to solid, capped or enhanced-grain products commonly adds £30–£110/m².
Layout complexity
Diagonal boards, picture framing, curves and frequent mitres can increase the rate by 12–30%.
Access and height
Restricted handling routes, raised decks or additional edge protection can add £25–£75/m².
Package size
Small or fragmented areas commonly attract a 15–35% uplift because mobilisation, cutting and supervision are spread over fewer square metres.
Quantity surveyor insights
  • Waste and buildability: Allow about 7–10% board waste for simple rectangular layouts and 12–18% where diagonal runs, picture frames or multiple cut-outs occur; coordinating joist centres with board lengths materially reduces offcuts and labour.
  • Scope and procurement: Confirm whether the package includes the subframe, pedestals, membranes, steps, balustrade interfaces, fascia boards and drainage falls, as these are frequent scope gaps; proprietary boards, clips and trims should be sourced as one warranted system with colour availability and lead times secured early.

Estimate Anything AI answer · indicative budget rates · updated 31 August 2026

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