
How Much Does It Cost To Build Decking? A UK Guide
October 9th 2026
As homeowners look for ways to get more from their gardens, decking has become a popular alternative to more expensive landscaping projects. It can quickly turn an unused area into a usable space for dining and relaxing, with much less disruption than laying a large paved area.
But how much does decking actually cost? Prices vary depending on the material, size, design, ground conditions and labour. This article explores UK decking costs in 2026, with ballpark figures per square metre to help you price your project.
Building Decking Costs In The UK
In this article, costs include the decking, substructure and basic soft landscaping, such as scraping back growth and preparing areas around the deck. They do not include clearing existing patios or old decking, removing or levelling unsuitable ground, or additional features such as steps, balustrades and lighting.
We’ve provided three different benchmarks to show the range of pricing you can expect among different contractors. These are:
- Low benchmark – smaller companies are generally lower cost but less specialised and with low project management function; good for low/mid-spec projects and tight budgets.
- Mid benchmark – medium-sized companies offer a balanced mix of cost-effectiveness and specialisation; good for mid-range projects for effective execution within moderate budgets.
- High benchmark – larger companies generally have a higher cost base but can handle a wide variety of specialist tasks; good for mid/high-spec projects and project management.
The specification and benchmark you choose will have a major impact on the overall cost of building decking, so it’s important to align them with your budget and the finish you’re aiming for.
Cost Of Building Timber Decking 10m²
Here’s a table showing the average costs of installing 10m² timber decking:
|
Timber Decking 10m² |
Total Average Build Cost |
Average Cost Per Sq Metre |
||||
|
Low Benchmark |
Mid Benchmark |
High Benchmark |
Low Benchmark |
Mid Benchmark |
High Benchmark |
|
|
East Anglia |
£1,948 |
£2,141 |
£2,318 |
£195 |
£214 |
£232 |
|
London |
£2,161 |
£2,375 |
£2,573 |
£216 |
£238 |
£257 |
|
Midlands |
£1,888 |
£2,075 |
£2,247 |
£189 |
£207 |
£225 |
|
North England |
£1,866 |
£2,050 |
£2,221 |
£187 |
£205 |
£222 |
|
Northern Ireland |
£1,882 |
£2,033 |
£2,202 |
£188 |
£203 |
£220 |
|
Scotland |
£1,915 |
£2,104 |
£2,279 |
£191 |
£210 |
£228 |
|
South East |
£2,132 |
£2,343 |
£2,538 |
£213 |
£234 |
£254 |
|
South West |
£1,942 |
£2,157 |
£2,337 |
£194 |
£216 |
£234 |
|
Wales |
£1,921 |
£2,111 |
£2,287 |
£192 |
£211 |
£229 |
|
Average |
£1,962 |
£2,154 |
£2,334 |
£196 |
£215 |
£233 |
All costs exclude VAT, overheads, and profit.
Here’s what the data shows for the cost of installing 10m² timber decking:
- The minimum cost is £1,866, and the maximum cost is £2,573.
- The total average cost is £2,150, or £215 per square metre.
Cost Of Building Composite Decking 10m²
Here’s a table showing the average costs of building 10m² composite decking:
|
Composite Decking 10m² |
Total Average Build Cost |
Average Cost Per Sq Metre |
||||
|
Low Benchmark |
Mid Benchmark |
High Benchmark |
Low Benchmark |
Mid Benchmark |
High Benchmark |
|
|
East Anglia |
£2,233 |
£2,460 |
£2,669 |
£223 |
£246 |
£267 |
|
London |
£2,478 |
£2,730 |
£2,962 |
£248 |
£273 |
£296 |
|
Midlands |
£2,165 |
£2,385 |
£2,587 |
£216 |
£238 |
£259 |
|
North England |
£2,139 |
£2,356 |
£2,557 |
£214 |
£236 |
£256 |
|
Northern Ireland |
£2,158 |
£2,336 |
£2,535 |
£212 |
£234 |
£253 |
|
Scotland |
£2,196 |
£2,418 |
£2,624 |
£220 |
£242 |
£262 |
|
South East |
£2,445 |
£2,693 |
£2,922 |
£245 |
£269 |
£292 |
|
South West |
£2,227 |
£2,479 |
£2,690 |
£225 |
£248 |
£269 |
|
Wales |
£2,203 |
£2,426 |
£2,633 |
£220 |
£243 |
£263 |
|
Average |
£2,249 |
£2,476 |
£2,686 |
£225 |
£248 |
£269 |
All costs exclude VAT, overheads, and profit.
Here’s what the data shows for the cost of installing 10m² composite decking:
- The minimum cost is £2,139, and the maximum cost is £2,962.
- The total average cost is £2,471, or £247 per square metre.
Cost Of Building Aluminium Decking 10m²
Here’s a table showing the average costs of installing 10m² aluminium decking:
|
Aluminium Decking 10m² |
Total Average Build Cost |
Average Cost Per Sq Metre |
||||
|
Low Benchmark |
Mid Benchmark |
High Benchmark |
Low Benchmark |
Mid Benchmark |
High Benchmark |
|
|
East Anglia |
£3,439 |
£3,808 |
£4,149 |
£344 |
£381 |
£415 |
|
London |
£3,816 |
£4,226 |
£4,604 |
£382 |
£423 |
£460 |
|
Midlands |
£3,333 |
£3,691 |
£4,021 |
£333 |
£369 |
£402 |
|
North England |
£3,294 |
£3,647 |
£3,974 |
£329 |
£365 |
£397 |
|
Northern Ireland |
£3,323 |
£3,616 |
£3,940 |
£327 |
£362 |
£394 |
|
Scotland |
£3,381 |
£3,744 |
£4,078 |
£338 |
£374 |
£408 |
|
South East |
£3,765 |
£4,169 |
£4,542 |
£377 |
£417 |
£454 |
|
South West |
£3,429 |
£3,838 |
£4,181 |
£347 |
£384 |
£418 |
|
Wales |
£3,392 |
£3,756 |
£4,092 |
£339 |
£376 |
£409 |
|
Average |
£3,464 |
£3,833 |
£4,176 |
£346 |
£383 |
£418 |
All costs exclude VAT, overheads, and profit.
Here’s what the data shows for the cost of installing 10m² aluminium decking:
- The minimum cost is £3,294, and the maximum cost is £4,604.
- The total average cost is £3,824, or £382 per square metre.
Average Cost To Build Decking In 2026
So, how much does it cost to install decking in the UK? Based on the three different projects covered in this article, you can expect it to cost on average (when using a mid-benchmark contractor):
- Timber Decking 10m² – £2,154, or £215 per square metre.
- Composite Decking 10m² – £2,476, or £248 per square metre.
- Aluminium Decking 10m² – £3,833, or £383 per square metre.
Please remember that these costs exclude a contractor’s overheads, profit, and VAT. There may be other additional costs, such as obtaining planning permission, conducting structural surveys, making unexpected repairs, and completing custom finishes.
Start your free trial with BuildPartner today to get the most accurate estimate of building decking based on your own dimensions and specifications.
FAQs About Decking Costs In The UK
Here are some frequently asked questions about decking costs in the UK.
Is composite decking more expensive than timber decking?
Composite decking is generally more expensive upfront than timber decking, but it requires less maintenance and is resistant to rot and splintering. It also lasts longer and keeps a more consistent appearance, although it can become hot in direct sunlight, look less natural and be harder to repair.
Timber decking is cheaper initially and has a more natural appearance, with the option to stain or paint it. However, it requires more maintenance and can rot, crack, splinter and fade over time.
How long does decking last?
A well-built timber deck can last around 10 to 15 years, or more with proper care. Composite decking can often last 20 to 30 years, depending on the product and installation. Aluminium decking can last 30 to 50 years as it is highly resistant to rot, rust, insects and weathering.
Do I need planning permission for decking?
Most garden decking does not require planning permission if it is no more than 30cm above ground level, covers no more than 50% of the garden when combined with other extensions and outbuildings.
A common point of conflict is when decking is built with pergolas or shelters. If a pergola is within 2m of a boundary, it generally cannot exceed 2.5m high. Exceeding the relevant limits may mean that planning permission is required.
What are some other cost implications of installing decking?
The cost of decking isn’t just the price of the timber and installation. You may also need to budget for clearing existing patios or old decking, removing or levelling unsuitable ground, and installing other features like steps, balustrades, and lighting.
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