Cost Of Installing Composite
Decking

Introduction

In 2026, the average cost to install composite decking in the UK ranges from £130 to £203 per m² (fully installed). While upfront costs are higher than timber, the long-term value lies in durability.

When looking to invest in composite decking, it’s important to factor in what kind of budget you can work within. You should determine what you’re willing to spend and estimate all the expenses associated with your landscaping project. In this guide, we will discuss the key cost factors for composite decking, including materials, labour, and accessories.

From our customer feedback, we understand that some of you might want to review everything with a quick glance. Please see our summary cost table below or use the ‘Jump To’ menu to find the specific section you need.

Estimated Cost Table

Item	Estimated Cost per m² (VAT incl.)	Example Cost (20m² Deck)
Composite Decking Boards	£37 - £80+	£740 - £1,600
Timber Subframe & Posts	£24.95	£499
Clips & Screws	£8.24	£164.80
Professional Labour	£60 - £90	£1,200 - £1,800
Estimated Total	£130 - £203+	£2,605 - £4,065+

Choosing Your Composite Materials

Composite decking is a superior material with an appearance that mimics wood, but it is more durable and aesthetically pleasing than timber. The price of the decking boards heavily depends on their quality.

When comparing live composite decking prices, you will find boards ranging anywhere between £37 to well over £100 per m², depending on quality and material composition. A good rule of thumb is to always focus on quality and buy the best you can afford.

You will also need to purchase materials for the subframe (joists and posts), fixings (screws and clips), and landscaping fabric. You may also want to add accessories like balustrades, rails, and pergolas, which will add to the overall cost.

⚠️ Expert Budgeting Tip: Don’t Forget the “Waste Factor”

When calculating your board costs, a good tip is always add wastage. This allows for offcuts and errors during the install.

• The Rule: Always add 10% to 15% extra material to your order. If your deck is 20m², budget for 22m² or 23m² to ensure you don’t run short during installation.

Understanding UK Contractor Costs

The next step is to budget for professional installation – the price will depend on the size and complexity of your project, as well as your geographical location.
The average labour cost for a standard installation is around £60-£90 per m². Certain designs, such as projects with curves or multiple levels, will take more time to install; which will be reflected in the final labour cost.

It is highly advisable to also agree on a clear timeframe for completion. If not, the costs can quickly increase, causing issues for both the fitter’s and the customer’s expectations. You might consider opting for the DIY route, especially if you have experience in construction; doing so, you can save over a thousand pounds on an average-sized garden deck.

Expert Tip: Review guides on how to build your decking right before making the decision to purchase your materials, and understand if you can do it yourself or if you will require an installer.

⚠️ Expert Tip: A Note on Labour Costs

We work closely with numerous fitters across the UK. While it is certainly possible to find quotes cheaper than £60 per m², experience has taught us that you get what you pay for. For a fully insured, professional installer with a strong skill set, the average labour charge typically sits between £60 and £90 per m², depending on your location.

A Complete Project Case Study (20m² Deck)

It’s key to point out that installation is one of the largest expenses in a composite decking project. To help give you a full estimate, let’s look at a case study for a 20m² decking area. Here we compare the costs for our most competitive Uncapped and Capped boards.

Item	Cost per m² (VAT incl.)	Total for Uncapped Project	Total for Capped Project
Decking Boards	£37.10 (Uncapped) / £54.33 (Capped)	£742.00	£1,086.60
Timber Subframe	£24.95	£499.00	£499.00
Clips & Screws	£8.24	£164.80	£164.80
Professional Labour	£60	£1,200 - £1800	£1,200 - £1,800
Estimated Total	£130 - £203	£2,605.80 - £3,205.80	£2,950.40 - £3,550.40

As highlighted, professional installation is a significant cost. If you are considering the DIY route to save money, decking installation manual for support and guidance on how to correctly install your boards. If you wish to ask questions or enjoy a human touch, our UK-based team is happy to support you throughout every step of your project.

The Verdict: Is Composite Decking a Worthwhile Investment?

The case study above clearly shows that the initial material and installation cost for composite decking is higher than traditional timber – but to understand the true value of your investment, you need to look at the total cost of ownership over the lifespan of the deck.

Let’s compare the true cost of a 20m² timber deck vs. a composite deck over 10 years:

Factor	Traditional Softwood Decking	Composite Decking
Upfront Project Cost	£2,150	£2,600
Annual Maintenance Cost	£84 (Requires professional cleaning, sanding, staining/sealing every 1-2 years)	£13.50 (Simple soap & water clean)
Replacement Risk (10 Years)	High (Many softwoods rot by year 10-12)	Low (Designed to last 25-30+ years)
Estimated 10-Year Cost	£2,990 + Possible Replacement	£2,800
Avg. Lifespan	10-15 years	25-30+ years
Adds Resale Value?	Minimal depending on up-keep and age	Yes, often more (due to low maintenance appeal)

Please note: Maintenance costs are estimated. Our wood decking maintenance figure is based on one annual sealing/staining job, including an average material cost of £30 and 4 hours of labour valued at £13.50/hr. Monthly cleaning time is also valued at £13.50/hr.*

As the table shows, the significant annual costs of maintaining a wooden deck clearly display that a composite deck can become the more cost-effective option in as little as 5-7 years.

Conclusion

With its 25+ year lifespan, minimal upkeep, and higher appeal to future homebuyers – composite decking is a smart, long-term investment in your home; the only reason to reconsider is if you are planning to move house in the next couple of years. For most customers however, it is the best choice of investment and is a cost-effective addition to help you elevate the visual majesty of your garden.

For a more detailed, feature-by-feature comparison of how wood and composite stack up on durability, aesthetics, safety, and more, see our [Definitive UK Guide: Wood vs. Composite Decking].