Choosing between composite and timber decking is one of the first — and most important — decisions you'll make when planning a new deck. Both materials can give you a beautiful outdoor space, but they behave very differently once they're exposed to the UK's rain, frost and changing seasons. This guide breaks down the real differences so you can pick the right decking boards for your garden, budget and lifestyle.
What is Timber Decking?
Timber decking is made from natural wood, pressure-treated to resist rot, insects and moisture. It has a warm, traditional look that many homeowners prefer, and it's usually the more affordable option upfront. Our Timber Treated Decking Boards are treated specifically for outdoor use in UK conditions, and we also stock Treated Decking Board Kits for a straightforward, all-in-one setup.
The trade-off is maintenance. Timber needs regular staining, sealing or oiling to keep its colour and stay weatherproof, and without upkeep it can grey, splinter or become slippery over time.
What is Composite Decking?
Composite decking is manufactured from a mix of wood fibres and recycled plastic (WPC — wood-plastic composite). It's designed to replicate the look of timber while removing most of the maintenance burden. Our composite range includes Composite Decking Boards in Classic, Woodgrain, Premium and Wide Max profiles, plus ready-to-go Composite Decking Board Kits.
Composite boards resist rot, fading, splintering and insect damage far better than natural wood, and they don't need annual staining or sealing — an occasional wash with soap and water is usually enough.
Composite vs Timber Decking: Key Differences
| Factor | Timber Decking | Composite Decking |
|---|---|---|
| Upfront cost | Lower | Higher |
| Maintenance | Annual staining/sealing | Occasional cleaning |
| Lifespan | 10–15 years (with upkeep) | 20–25+ years |
| Weather resistance | Good, if maintained | Excellent, low degradation |
| Appearance | Natural wood grain, ages over time | Consistent colour, wood-look finish |
| Slip resistance | Can become slippery when untreated | Textured, grip-focused surface |
| Installation | Standard tools and joists | Standard tools and joists |
Cost Comparison
Timber decking is generally cheaper to buy, which makes it appealing for smaller budgets or short-term projects. However, the ongoing cost of stains, sealants and replacement boards over the years can close the gap. Composite decking costs more initially but requires little to no annual spend afterward, so the total cost over 10+ years often evens out — or favours composite for long-term homeowners.
Maintenance Requirements
This is usually the deciding factor for most people.
- Timber needs cleaning, sanding and re-staining roughly once a year to prevent greying, rot and splitting.
- Composite needs an occasional sweep and a wash with mild soap and water — no sanding, staining or sealing required.
If you want a deck that looks good with minimal weekend work, composite is the clear winner. If you enjoy the natural material and don't mind the upkeep, timber remains a solid choice.
Which Decking is Best for UK Weather?
The UK's mix of rain, frost and damp winters puts real pressure on outdoor materials. Composite decking handles this particularly well — it doesn't absorb moisture the way timber does, so there's a lower risk of warping, rot or mould in wetter regions. Timber can perform well too, but only if it's properly treated from the start and re-treated consistently; skipping maintenance in a wet climate speeds up wear noticeably.
Which Should You Choose?
- Choose timber if you want a lower upfront cost, love the natural wood look, and don't mind yearly maintenance.
- Choose composite if you want a low-maintenance deck that holds its appearance for decades with minimal effort.
Both are valid choices — it comes down to your budget, how much time you want to spend maintaining it, and how long you plan to keep the deck in place.
What You'll Need to Complete Your Deck
Whichever material you choose, a few essentials will complete the build:
- Decking Joists for a solid, level frame
- Decking Trims for a clean, finished edge
- Screws & Clips for secure, hidden fixings
- Handrails for raised decks or added safety
If your space is small or you want the simplest possible install, our Decking Tiles are a joist-free alternative worth considering.
Frequently Asked Questions
Does composite decking get hot in summer?
Composite can get warmer underfoot than timber in direct sun, though lighter colours reduce this noticeably.
Can I install composite decking myself?
Yes — composite boards install using the same joist and fixing method as timber, so most confident DIYers can manage it with standard tools.
Is timber decking cheaper in the long run?
Not always. While timber costs less upfront, the ongoing cost of staining and sealing over 10+ years can make composite more cost-effective overall.
Which decking lasts longer?
Composite decking typically lasts 20–25+ years with minimal care, compared to 10–15 years for well-maintained timber.
Ready to choose your decking? Browse our full range of Timber Treated Decking Boards and Composite Decking Boards, or shop everything in one place with All Decking Boards.