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Both composite and timber decking can transform an outdoor space. Both look great in the right setting. And both come with genuine advantages worth knowing about.

But they are not the same product. The right choice depends on your budget, how much time you want to spend on maintenance, what your garden looks like, and how long you want the deck to last.

We supply both composite decking and decking accessories at The Outdoor Look. So we have no reason to push you towards one option over the other. In this guide, we give you an honest, practical comparison so you can make the right call for your garden.

What Is Composite Decking?

Composite decking is made from a blend of wood fibres and recycled plastic, bound together and moulded into boards. Most modern composite boards also feature a protective capped outer layer, which provides additional resistance to staining, fading, and moisture.

The result is a product that looks similar to timber but behaves very differently over time. It does not absorb water, it does not rot, and it does not require annual treatment.

Composite decking is available in several formats. Deep embossed boards mimic the grain and texture of natural wood closely. Capped boards offer the highest protection against weathering and staining. Enhanced ranges often feature improved colour consistency and longer warranties.

What Is Timber Decking?

Timber decking uses real wood boards to create a natural outdoor surface. You can choose from softwoods like pressure-treated pine and spruce, or hardwoods such as oak, ipe, or balau. Each has different costs, durability levels, and maintenance needs.

Softwood is the most affordable option and widely available from builders' merchants across the UK. Hardwood costs more but lasts longer and develops a sought-after silver patina as it weathers.

All timber decking requires some form of treatment to stay in good condition outdoors. Without it, moisture, UV exposure, insects, and fungal growth will shorten its lifespan considerably.

Cost Comparison: Upfront vs Lifetime

This is where the biggest difference lies. Timber looks cheaper in the shop. Composite looks more expensive. But the full picture is more nuanced.

To put that into a real example: for a 16 square metre deck, a timber deck using pressure-treated softwood boards typically costs £800 to £1,200 in materials. A composite alternative on a similar subframe costs £1,200 to £1,800. That is a gap of roughly £400 to £600 upfront.

But timber decking requires oiling or staining every year. Each application costs around £40 to £80 in products alone, plus a full weekend of your time. Over five years that adds up to £200 to £400 in materials and around ten days of maintenance work. Composite needs nothing more than an occasional wash with warm soapy water.

Most timber decks in the UK reach the end of their useful life between years 12 and 18. A full replacement at that point essentially doubles your original investment. A composite deck at year 15 or 20 is still performing as it did on day one.

Maintenance: The Real Difference

Maintenance is the deciding factor for most UK homeowners. And here, composite wins clearly.

Timber decking requires a full clean each spring. That means pressure washing or scrubbing to remove algae and mould, sanding any rough or splintered areas, and then applying one or two coats of decking oil or stain. In wet, north-facing, or shaded spots, algae returns faster and maintenance is needed more often.

From around year five, individual boards start to warp, split, or show rot. Replacing a few boards each year adds £50 to £150 in materials. By year eight or nine, the substructure itself may need attention.

Composite decking has no equivalent maintenance cycle. You brush off leaves and debris, wash it down occasionally, and that is the full extent of it. There is no sanding, no oiling, and no board replacement under normal use.

Durability and Weather Resistance

The UK climate is not kind to timber. We get sustained rainfall, high humidity through autumn and winter, and ground-level frost that works its way into even well-treated boards.

Composite decking boards do not absorb moisture. They do not swell, crack, or warp as timber does in wet conditions. The plastic component in the mix creates a natural barrier against the moisture cycles that degrade wood over time.

Timber decking is more vulnerable. Without consistent treatment, moisture penetrates the wood, leading to fungal growth, soft spots, and eventual structural failure. In shaded gardens where the deck dries slowly after rain, this process happens faster.

Composite decking also resists insects better than timber. The dense structure and plastic content make it far less attractive to wood-boring beetles and other common garden pests that can silently hollow out a softwood deck over several years.

Aesthetics: A Genuine Debate

This is the area where personal preference matters most. Some homeowners strongly prefer real timber. The grain, the smell, the authenticity of natural wood is something composite simply cannot replicate perfectly.

Modern composite boards have come a long way. Deep embossed profiles and varied colour runs create a convincing wood appearance. Some people cannot tell the difference from a distance. But up close, composite has a consistency to it that real timber does not. Every board looks similar. Some find this appealing. Others find it slightly synthetic.

Timber offers natural variation in grain, colour, and character. This is either its charm or its flaw depending on your design sensibility. If you are restoring a period property or want an authentically natural garden aesthetic, timber is the honest choice.

If you are creating a clean, modern outdoor space and want a surface that holds its colour year after year without fading or greying, composite is the stronger option.

Safety in the UK Garden

Slip resistance matters on any UK deck, but especially in autumn and winter when algae, moss, and wet leaves are a constant presence.

Composite decking has a built-in slip-resistant surface. The narrow grooves in the board profile channel water away and provide grip even when wet. Most composite decking ranges achieve a good anti-slip rating without any additional treatment.

Timber decking becomes slippery when wet, especially in shaded areas. Anti-slip strips can be added, but these require maintenance and replacement over time. Without them, a wet timber deck is a genuine hazard, particularly for children and older people.

Composite is also splinter-free. For families with young children who play barefoot, this is a meaningful safety advantage.

Environmental Considerations

Both materials have an environmental story, and neither is straightforwardly greener than the other.

Composite decking uses recycled materials in its manufacture, including recycled plastic and FSC-certified wood fibres. Its long lifespan means fewer replacements over the life of a garden, which reduces the total material used. However, composite boards are not biodegradable and recycling options at end of life remain limited in most parts of the UK.

Timber is a natural, renewable material. If sourced from sustainably managed forests certified by the Forest Stewardship Council, it carries a lower carbon footprint in production. It is also biodegradable. However, its shorter lifespan means more frequent replacement and therefore more material use over the long term.

For a considered environmental choice, look for FSC-certified composite boards made from recycled plastics, or FSC-certified hardwood if you prefer genuine timber. Avoid cheap, uncertified softwood, which often comes from poorly managed sources and degrades quickly enough to negate any environmental benefit.

For further guidance on responsible timber sourcing, the Forest Stewardship Council publishes their certification standards and supplier lists at fsc.org.

Which Should You Choose?

Choose composite decking if you want a surface that stays looking good year after year with minimal effort. It suits modern gardens, busy households, and anyone who does not want to spend weekends on maintenance. It is the stronger choice for families with children, holiday lets, and commercial outdoor spaces.

Choose timber decking if you love the authentic look and feel of real wood and you are happy to invest time in regular care. Hardwood decking in particular ages beautifully and can last decades with the right attention. It is also the better choice if you are on a tight upfront budget and willing to accept higher ongoing costs.

You can browse our full composite decking range, including deep embossed, capped, and enhanced boards, in our composite decking collection. Each range comes with clear information on finish, colour options, and warranty length to help you choose the right board for your project.

Frequently Asked Questions

Q: Does composite decking really last longer than timber in the UK?

Yes. Composite decking typically lasts 25 to 30 years or more under normal residential use. Well-maintained softwood timber decking lasts 10 to 15 years on average. Hardwood timber can last 15 to 25 years with regular oiling. Composite boards resist the moisture, frost cycles, and fungal growth that shorten timber lifespan in the UK climate. Most composite decking manufacturers offer warranties of 10 to 25 years against fading, staining, and structural failure.

Q: Is composite decking more expensive than timber overall?

Composite decking costs more to buy initially. Materials typically cost £45 to £100 per square metre compared to £15 to £30 per square metre for softwood timber. However, composite requires almost no ongoing maintenance cost, while timber requires annual oiling, staining, and periodic board replacement. Over a 20-year period, composite is generally the more cost-effective choice when you include both the purchase cost and the lifetime maintenance cost.

Q: Can composite decking get slippery in wet weather?

High-quality composite decking has a built-in textured or grooved surface that provides slip resistance even when wet. This is one of its advantages over untreated timber, which can become very slippery in damp or shaded conditions. For maximum safety, choose a composite board with a confirmed anti-slip rating and ensure the surface is kept free of debris and moss, which can build up in any outdoor surface over time.

Q: Can I change the colour of my composite decking after installation?

No. Composite decking boards are manufactured in a fixed colour and cannot be stained, painted, or changed after installation. If the colour of your deck no longer suits your garden design, the boards would need to be replaced. This is worth considering at the purchase stage. Timber decking, by contrast, can be sanded back and restained in a different colour. If the ability to change your deck's appearance over time matters to you, timber offers more flexibility on this point.