Composite Decking in Swansea: What It Costs and Why It Suits the Coast

If you’re weighing up decking for a garden in Swansea, the sea air is worth thinking about before anything else. Salt-laden wind off Swansea Bay is hard on timber deck boards, and it’s one of the main reasons homeowners along the coast are looking at composite decking instead.

Ellis Decks LTD is a TrexPro® Gold installer based in Ebbw Vale, fitting composite decking for homes across South Wales, Swansea included. This guide covers what it costs, how it copes with coastal weather, and what to check before you commit.

Why Composite Decking Suits a Coastal City Like Swansea

Timber decking near the coast has a hard job. Salt in the air draws moisture into the wood, and that cycle of swelling and drying is what causes splitting, cupping and rot over time. Homeowners near Swansea Bay, Mumbles or the Gower coast typically need to re-stain or reseal a timber deck every year just to keep it protected, and even then, salt exposure speeds up the wear.

Composite decking behaves differently. Trex boards are made from a blend of recycled wood fibres and plastic, so they don’t absorb moisture the way solid timber does. That means no rot, no warping from damp sea air, and no annual staining. You still need to wash the boards down now and then to clear salt residue and general grime, but that’s a world away from sanding and resealing timber every spring. Our composite decking cleaning guide covers the routine.

What Composite Decking Costs in Swansea

Cost is usually the first question, so here are the figures. Trex composite decking installed in South Wales typically costs £150 to £350 per square metre, depending on the range, the subframe and extras like steps, railings or built-in seating.

Broken down by deck size, most homeowners are looking at:

• Small deck (10 to 15m²): around £1,500 to £5,000
• Medium deck (15 to 20m²): around £2,500 to £7,000
• Large deck (20 to 30m²+): from around £4,000, and well beyond £10,000 for raised or complex builds

A small or medium job usually wraps up in around a week. Larger or more complex projects can take two to four weeks. Every Swansea garden is different, so the only way to get an accurate figure is a site visit. Call Ellis Decks on 07971 750900 or use the contact form to get a quote started. Our full cost guide explains what pushes the price up or down.

Composite vs Timber Decking by the Swansea Coast

Timber costs less upfront, and that’s the main argument in its favour. But in a coastal spot like Swansea, the ongoing cost tells a different story. Timber needs regular treatment against moisture and salt damage, and even well-maintained boards usually need replacing well within 15 years near the sea. For a fuller look, see our composite vs timber decking guide.

Composite decking costs more to install, but it’s built to last 25 to 30 years, with Trex warranties of 25 or 50 years depending on the range. There’s no annual staining and no watching for rot where water pools around the joists.

If you’re replacing an old timber deck that’s already damaged by sea air, that’s exactly the job our timber decking replacement service handles, swapping tired boards for a Trex composite deck built for the conditions. It’s also worth reading about common composite decking problems before choosing an installer.

Why a TrexPro Gold Installer Matters for a Swansea Deck

Ellis Decks has over 12 years’ experience and installs composite decking exclusively, using Trex as its material of choice. Being a TrexPro Gold installer means the team has met Trex’s standards for training and workmanship, which supports the long warranties on premium installations. Our guide to what a TrexPro Gold installer is explains more.

The company is based in Ebbw Vale, and its established coverage runs across towns like Abergavenny, Usk, Monmouth and Cardiff, but it takes on projects across South Wales, including Swansea and the Gower coast. The same standards and the same Trex materials apply wherever the job is.

What Customers Say

As one South Wales customer put it, “Ellis transformed our garden from a tired overgrown area into a fantastic outdoor living space that the family absolutely love.” You can read more in our composite decking reviews before deciding who to hire.

Planning a deck on the coast? Call Ellis on 07971 750900 or request a free estimate.

Decking Planning Rules for Swansea Gardens

Before planning a Swansea deck, it’s worth checking whether you need planning permission. Welsh Government guidance sets out the permitted development rules: decking is generally permitted without an application if it’s no more than 30cm above ground level, stays within the rules on the side and front of the house, and, together with other extensions, covers no more than 50% of your garden.

Swansea’s planning authority is the City and County of Swansea, and it’s worth checking with them directly if your home sits in a conservation area or has an Article 4 direction attached, since either can remove permitted development rights that would otherwise apply. Our guide to decking planning permission explains the rules in more detail.

Is Composite Decking Right for Your Swansea Garden?

If your garden catches sea wind, or you’re tired of maintaining a timber deck every spring, composite decking is worth a serious look. It costs more upfront, so if you’re on a tight budget or only expect to be in the property briefly, that’s a fair reason to weigh it up carefully.

For most homeowners planning to stay put, the lower maintenance and longer lifespan make composite the better long-term choice this close to the coast. Call 07971 750900, email enquiries@ellisdecks.co.uk or get in touch online to talk about your Swansea garden.