How Much Does Composite Decking Cost in South Wales?

If you are planning a new deck, one of the first questions is always cost.

In South Wales, Trex composite decking installed by a specialist typically costs between £150 and £350 per m², with most garden projects falling somewhere between £1,500 and £10,000+, depending on size, the Trex range chosen and how complex the build is.

Smaller, simple decks can start from around £1,500, while larger or more complex builds can go well beyond £7,000 once features like steps, raised subframes, railings and finishing details are included.

The key thing to understand is that decking costs are not just about the boards. The final price depends on several factors, including the type of composite used, the structure underneath, and how the deck is installed.

At Ellis Decks LTD, we provide quotes based on your specific project rather than a fixed price per metre. This means you get a deck designed around your space, your layout and how you plan to use it.

If you want to see how different budgets translate into real projects, you can explore our decking projects or learn more about our composite decking installation services.

Quick Answer: Composite Decking Costs in South Wales

If you are looking for a simple estimate, here is a realistic guide for Trex composite decking installed in South Wales:

• £150 to £350 per m² installed, depending on the Trex range and the build
• Around £1,500 to £5,000 for smaller, simple decks (roughly 10 to 15m²)
• Around £2,500 to £7,000 for medium decks (roughly 15 to 20m²)
• £4,000 to £10,000+ for larger or more complex projects (20 to 30m² and above)

These figures give a good starting point, but every project is different.

A small, ground-level deck with easy access will sit at the lower end of the range. A larger deck with steps, raised sections or more complex groundwork will increase the cost.

This is why most decking projects are priced individually. The layout, materials and installation all play a role in the final quote.

For a more detailed breakdown, the next sections explain how material choices, labour and design all affect the total cost.

Composite Decking Cost Per m²

Board Costs

The cost of composite decking starts with the boards themselves.

Across the UK market, composite boards on their own typically range from £35 to £80+ per m², depending on the type and quality. Lower-cost boards are usually hollow-core and uncapped, while higher-end options are solid or capped for better durability and appearance.

Premium boards tend to cost more upfront but are designed to last longer and perform better over time.

Installed Cost Per m²

Once the subframe, fixings, labour and finishing are included, the price increases.

For Trex composite decking installed in South Wales, a typical range is £150 to £350 per m². Entry-level ranges such as Trex Enhance sit towards the lower end, while premium ranges like Transcend and Signature, raised builds and decks with railings or lighting sit towards the top. Our guide to Trex decking ranges explains the differences.

This includes materials, labour and installation, but the final cost will still depend on the details of the project.

How Much Does a Composite Deck Cost by Size?

Small Composite Deck (10 to 15m²)

A smaller garden deck is usually the most budget-friendly option. Typical costs:

• Around £1,500 to £5,000 depending on the range and layout
• Minimal groundwork and straightforward installation keep costs lower

These are often ground-level decks with basic designs.

Medium Composite Deck (15 to 20m²)

This is a common size for family gardens. Typical costs:

• Around £2,500 to £7,000 depending on materials and layout
• Costs increase with features like steps, edging and upgraded boards

Large Composite Deck (20 to 30m²+)

Larger decks naturally require more materials and labour. Typical costs:

• £4,000 to £10,000+ for larger builds
• Raised decks, multiple levels or custom features will increase the price further

The key takeaway is that size has a major impact on cost, but it is not the only factor. Design, materials and installation quality all play a role in the final price.

Want a real figure for your garden? Send Ellis a few photos and rough measurements. Call 07971 750900 or request a free composite decking estimate.

What Affects the Cost of Composite Decking?

Board Type and Quality

Not all composite decking is the same.

Lower-cost boards are usually hollow and uncapped. These are more budget-friendly but may not offer the same durability or long-term performance.

Higher-quality boards are often solid or capped. These are designed to resist fading, staining and moisture more effectively, which is why they tend to cost more.

Subframe and Structure

The structure underneath the decking plays a big role in cost.

A simple timber subframe on level ground will be more affordable. However, if the deck needs to be raised, built on uneven ground or designed with additional support, the cost will increase.

The subframe is critical to the lifespan of the deck, so it is not an area to cut corners.

Installation Complexity

The more complex the design, the higher the cost. Things that can increase labour time include:

• Sloped gardens
• Raised decks
• Steps or multiple levels
• Limited access to the site

These factors require more time, materials and planning during installation.

Labour Costs in South Wales

Labour is a significant part of the overall cost.

Typical rates are around £150 to £250 per day, depending on the installer and the complexity of the project.

Experienced installers may charge more, but this is often reflected in the quality of the finished deck and how well it performs over time. It is one reason we explain why a TrexPro Gold installer matters.

Extras and Finishing

Additional features can also affect the final price. These may include:

• Edging and trim
• Steps and balustrades
• Built-in lighting
• Waste removal

While these add to the cost, they can also improve the look and usability of the finished deck.

Hidden Composite Decking Costs to Be Aware Of

When planning a decking project, it is important to consider costs beyond the basic materials and labour.

Ground Preparation

If the area needs to be cleared, levelled or prepared before installation, this can add to the overall cost.

Drainage and Foundations

In some cases, drainage needs to be improved or additional groundwork is required to support the structure. This is especially important in wetter areas like South Wales.

Removal of Existing Decking

If you are replacing an old deck, there may be costs involved in removing and disposing of existing materials. See our page on timber decking replacement for how we handle it.

Fixings and Finishing Details

Small components such as hidden fixings, trims and edge boards can add up, but they are essential for a clean, professional finish.

Understanding these factors helps explain why decking quotes can vary. Two decks of the same size can have very different costs depending on the design, materials and site conditions.

Composite vs Timber Decking Costs

Timber decking is usually cheaper at the start.

Softwood decking is the most budget-friendly option, with lower material costs and simpler installation. Hardwood costs more but still tends to sit below or around the same level as some composite options.

However, the long-term costs tell a different story.

Timber decking requires regular maintenance. This includes cleaning, staining, oiling or sealing to protect it from moisture and weather. Over time, these costs add up, along with the time needed to carry out the work.

Composite decking has a higher upfront cost, but it requires far less maintenance. There is no need for staining or sealing, and the material is designed to last longer.

Over 20 to 30 years, many homeowners find that composite decking offers better value overall.

If you want a full comparison of how the two materials perform, you can read our guide on composite decking vs timber decking.

Is Composite Decking Worth the Cost?

For many homeowners, the answer is yes.

Composite decking is designed for long-term performance. It resists moisture, does not rot and requires very little upkeep compared to timber.

With a typical lifespan of around 25 to 30 years, and warranties of up to 50 years on premium systems, it offers a level of durability that reduces the need for repairs or replacement.

It also saves time. Instead of regular sanding, staining or sealing, most composite decks only need occasional cleaning to stay in good condition.

While the initial cost is higher, the combination of low maintenance and long lifespan often makes composite decking the more practical choice over time. We go into this in more detail in is Trex composite decking worth the money?

If you want to understand how composite decking is designed to perform, you can read our guide on what Trex composite decking is.

Composite Decking Costs in South Wales: What to Expect

A typical range of £150 to £350 per m² installed is a good guide for Trex composite decking in South Wales, with the final figure depending on the range, the design and the site.

Local factors can still influence the final price.

Things like site access, garden layout and ground conditions all play a role. For example, properties with limited access or uneven ground may require more time and preparation, which can increase labour costs.

There is also good availability of composite decking across South Wales, including areas like Cardiff, Swansea and Newport. This means materials are generally easy to source, and lead times are usually reasonable.

Overall, the final cost will always come down to the specifics of your project.

Getting an Accurate Composite Decking Quote

The most accurate way to understand the cost of composite decking is to get a quote based on your space.

Every garden is different. The size, layout, height and materials all affect the final price, which is why fixed pricing rarely reflects the real cost of a project.

At Ellis Decks LTD, we provide quotes based on your exact requirements. This allows us to design a deck that fits your space properly and performs well over time, rather than working from generic estimates.

We focus on delivering good value by combining quality materials with proper installation, so the deck lasts and requires minimal maintenance.

If you are considering a decking project anywhere in South Wales and the borders, call 07971 750900, get in touch through our contact page or learn more about our composite decking services to see how we approach each build.