Composite vs. Timber Decking: What's the Difference?

Expert Comparison | 2026 Decking Guide

In the urban environments of London, outdoor decking serves as a functional extension of the living space. However, selecting the appropriate material requires balancing initial expenditure against maintenance requirements and long-term durability in the UK's temperate maritime climate.

At The Tree Amigos, we specialize in high-end carpentry and composite engineering. This guide provides a technical overview of the performance characteristics of softwood, hardwood, and Wood-Plastic Composite (WPC) materials.

1. Timber: Natural Wood Classifications

There is something undeniably satisfying about the feel of natural wood. Timber decking falls into three main categories, each with its own price point and lifespan:

Softwood (Treated Pine)

The most affordable option. It's easy to work with and takes stains well. However, in the UK climate, it is the most prone to rot. Without annual jet-washing and oiling, a softwood deck in a shaded London garden can become a "slip-and-slide" of green algae by November.

Hardwood (Yellow Balau, Ipe, Cedar)

Hardwoods are incredibly dense and naturally resistant to rot and insects. They offer a premium finish that looks stunning against modern brickwork. Cedar is particularly popular in London for its aroma and natural oils, though it is softer and can dent more easily than Ipe.

2. Composite Decking: Technical Advantages

Composite decking (like Millboard or Trex) is a hybrid of recycled wood fibers and high-density plastics. Higher-end brands like Millboard aren't even "plastic" in the traditional sense; they are hand-molded from real oak masters and encased in a resilient "Lastane" layer.

Low Maintenance, High Reward

The biggest draw of composite is the lack of maintenance. While your neighbor is spending their bank holiday weekend sanding and staining their timber deck, you're enjoying a glass of wine on your composite deck. A quick wash with soapy water is all it needs. It will never rot, never warp, and never need oiling.

Safety First

For families with children or elderly residents, composite is nearly always the better choice. It is splinter-free and provides exceptional slip resistance, even in the depths of a London winter. Millboard, in particular, has a non-porous surface that inhibits algae growth, which is the primary cause of slippery decks.

3. The Cost Comparison: Initial vs. Lifetime

Composite has a higher "upfront" cost, but when you factor in the cost of oils, cleaners, and the time spent maintaining timber, composite often becomes the cheaper option by year five.

4. The "Hidden" Secret: The Subframe

At The Tree Amigos, we've seen too many people spend £5,000 on premium composite boards only to lay them on a cheap timber subframe. If the subframe rots, the whole deck is lost.

For the ultimate "fit and forget" solution, we recommend Composite Bearers or Recycled Plastic Joists. These are completely immune to ground moisture, ensuring your deck remains rock-solid for decades.

5. Summary: Which Should You Choose?

If you are on a tight budget and don't mind getting your hands dirty once a year, Softwood Timber is a viable option. If you want the ultra-premium feel of a five-star hotel and have the budget for it, Hardwood (Yellow Balau) is unrivaled for beauty.

However, for 90% of our London clients, Composite Decking is the correct choice. It handles our erratic weather better, requires zero upkeep, and stays safe underfoot year-round.