Last updated: January 2025

Composite vs Timber Decking: Cost and Maintenance Comparison

Choosing between composite and timber decking is one of the biggest decisions in any deck project. Both materials have loyal advocates, and the right choice depends on your budget, how much maintenance you are willing to do, and how long you expect the deck to last. This guide compares the two materials across every dimension that matters — upfront cost, ongoing maintenance, durability, appearance, and environmental impact — so you can make an informed decision before buying a single board.

Upfront Cost Comparison

Treated softwood is the most affordable decking material in the UK, typically costing £4–6 per linear metre for pressure-treated pine or spruce. Hardwood options like oak or iroko range from £10–15 per metre. Composite boards sit between £15 and £30 per metre depending on quality, with premium capped composites at the higher end.

For a typical 4m × 3m deck, the board cost alone might be £200–300 in softwood versus £700–1,200 in composite. However, this does not tell the full story. Composite decks use the same joist subframe as timber, so the structural costs are identical. The difference is purely in the surface boards and hidden fixings (composite often uses clip systems rather than face screws).

Use our decking calculator to compare costs directly — select different board types and see how the total project cost changes. You might find that the gap is smaller than you expected once joists, screws, and membrane are included.

Maintenance Requirements

This is where the two materials diverge most significantly. Timber decking needs annual maintenance to stay in good condition. At minimum, you should sweep it regularly, clean it with a deck cleaner or pressure washer once a year, and apply a protective oil, stain, or preservative. Without treatment, softwood decking will grey, develop algae and moss growth, and eventually rot — particularly in the damp UK climate.

Composite decking requires almost no maintenance beyond occasional cleaning. A sweep and a wash with soapy water once or twice a year is usually sufficient. Composite boards do not rot, do not need oiling or staining, and are highly resistant to algae growth (particularly capped composites where the core is fully enclosed). Over a 20-year lifespan, the maintenance savings in time and products can be substantial.

Durability and Lifespan

Well-maintained softwood decking typically lasts 10–15 years before it needs replacing. Hardwood decking can last 25–40 years with proper care. Composite manufacturers commonly offer 20–25 year warranties, with premium products carrying 30-year or even lifetime structural warranties.

The key word with timber is "well-maintained." A softwood deck that is neglected will deteriorate rapidly — within 5–7 years in exposed, north-facing positions. Composite is more forgiving of neglect, though it is not indestructible. Heavy furniture can leave indentations, and some cheaper uncapped composites may fade or stain over time.

Appearance and Feel

Timber has a natural warmth and character that many homeowners prefer. Each board has unique grain patterns, and the material ages gracefully when maintained — developing a richer patina over time. Freshly oiled timber decking in a garden setting is hard to beat aesthetically.

Modern composite boards have improved dramatically in appearance. Premium products feature realistic wood-grain textures and colour variation that closely mimic natural timber. However, composite decking can feel slightly different underfoot — it tends to be denser and can get hotter than timber in direct sunlight. Some people find it less "authentic" despite the visual improvements.

Environmental Considerations

Timber from FSC or PEFC certified sources is a renewable material with a relatively low carbon footprint. However, pressure-treatment chemicals and the annual application of preservatives have environmental costs. Composite boards are typically made from a mix of recycled wood fibres and recycled plastic, diverting waste from landfill. The manufacturing process is more energy-intensive, but the longer lifespan and lack of chemical treatments can offset this over the product lifecycle.

Total Cost of Ownership

When you factor in annual maintenance costs — deck cleaner (£15–25), oil or stain (£30–60 for a small deck), and the time involved — softwood decking costs approximately £50–80 per year to maintain. Over 15 years, that is £750–1,200 in products alone, not counting your time. Composite decking has near-zero ongoing cost.

Adding the upfront cost and maintenance together, the total cost of ownership over 20 years is often comparable between mid-range composite and regularly maintained softwood — with composite offering less hassle. Our cost estimation guide breaks this down further with real numbers.

Which Should You Choose?

Choose timber if you have a tight upfront budget, enjoy hands-on maintenance, and prefer the natural look and feel of real wood. Choose composite if you want a low-maintenance deck that will look good for decades with minimal effort, and you are willing to pay more upfront for that convenience.

Frequently Asked Questions