Understanding the cost of decking per m2 is crucial for UK homeowners planning garden renovations in 2026. This comprehensive guide breaks down material costs, installation expenses, and regional variations to help you budget accurately for timber, composite, and specialist decking options.
The average cost of decking per m2 in the UK varies significantly based on material choice, quality, and installation complexity. As we move into 2026, decking prices have stabilised after the supply chain disruptions of previous years, with composite materials gaining popularity despite higher upfront costs.
Whether you're considering traditional timber, modern composite, or specialist decking like Millboard, accurate cost estimation begins with understanding the price per square metre. This guide provides current market rates, installation considerations, and exclusive insights for UK homeowners.
Use this simple formula to estimate your total decking cost:
Example: 20m² × £75/m² (composite) + £800 installation + £300 extras = £2,600
| Material Type | Cost per m² (Materials Only) | Installed Cost per m² | Lifespan | Maintenance Level |
|---|---|---|---|---|
| Pressure-Treated Softwood | £25 - £45 | £60 - £90 | 10-15 years | High (Annual treatment needed) |
| Hardwood (Ipe, Merbau) | £50 - £80 | £90 - £130 | 20-30 years | Medium (Biannual oiling) |
| Composite Decking | £55 - £95 | £100 - £150 | 25+ years | Low (Occasional cleaning) |
| PVC Decking | £60 - £100 | £110 - £160 | 20+ years | Very Low |
| Millboard Composite | £85 - £140 | £140 - £200 | 30+ years | Very Low |
Our market analysis shows that composite decking costs per m2 have decreased by approximately 8% since 2025 due to increased domestic manufacturing capacity in the UK. However, premium hardwood varieties have seen a 12% price increase owing to sustainable sourcing regulations and import tariffs.
Installation typically adds 40-60% to your material costs for the cost of decking fitted per m2. Professional installation ensures proper drainage, structural integrity, and compliance with building regulations.
Obtain 3 quotes, finalise design, check planning permissions if over 30cm height.
Allow for 5-10 day lead time, especially for composite materials.
Groundworks (2 days), subframe (2 days), decking installation (3-5 days).
Sealing, staining, or additional features installation.
The cost of decking per m2 UK varies by region. London and Southeast typically command premiums of 15-25% compared to national averages, while Northern regions may see costs 10-15% below average.
The average cost of decking per m2 in the UK ranges from £60-£150 installed, depending on materials. Basic softwood starts around £60/m², while premium composite averages £100-£150/m² installed.
Composite decking costs per m2 typically range from £55-£95 for materials only, or £100-£150 installed. Premium brands like Trex or Millboard can reach £140-£200/m² installed in 2026.
While timber has lower upfront costs (£25-£80/m² vs £55-£140/m² for composite), composite decking requires minimal maintenance and lasts 2-3 times longer, making it more cost-effective over 15+ years.
Installation complexity, site accessibility, subframe requirements, additional features (railings, lighting), and regional labour rates all impact the cost of decking fitted per m2.
Measure your area in m², multiply by your chosen material cost per m², add 40-60% for installation, then include extras like railings, stairs, or lighting. Our cost calculator above provides a quick estimate.
Composite decking prices have decreased 8% since 2025, while hardwood increased 12%. Overall, average decking costs per m2 have remained stable with ±5% changes across most categories.
Common hidden costs include ground preparation, drainage solutions, building regulation compliance, waste removal, and post-installation treatments or sealants not included in initial quotes.