Wood Decking vs Composite: What Your Deck Really Costs over Time
Wood decking has a lot going for it. It looks great, it feels good underfoot and, at least on the quote, it often comes in cheaper than the alternatives. That last point is where most people stop doing the maths. However, a deck isn't a once-off purchase. It's something you'll own, clean and look after for years.
So in this post, we look past the price per square metre. We'll walk through the hidden running costs of wood decking, how composite changes the picture and how to work out which option makes sense for your home and budget.
Why the quote only tells half the story
When you compare deck quotes, you're comparing materials and labour on day one. That's useful, but it ignores everything that happens after the builders pack up. Timber needs protecting from the moment it goes down. And in a South African summer, that protection works hard.
A deck that costs less upfront can easily cost more by year five or ten. The difference never shows up on a single invoice. Instead, it trickles out of your wallet one tin of sealer and one lost weekend at a time.
The hidden costs of wood decking
Let's break down where the money and time actually go. Not every deck will need all of these every year, of course. Still, if you're choosing timber, it's sensible to budget for most of them at some point in the deck's life, so nothing comes as a nasty surprise.
Sealers and oils: new timber needs a primer and several topcoats, then maintenance coats as the finish wears.
Sanding and prep: before each recoat, the surface needs a thorough clean and often a light sand.
Repairs: cupped, split or rotten boards need replacing, and loose screws need resetting.
Pest protection: the sub-frame needs preservative treatment to keep insects out.
Your time: a full clean and reseal often swallows an entire weekend.
Woodoc's own advice makes the point well. Their guide to the longevity of your timber deck recommends a primer plus three topcoats, regular sweeping and good ventilation underneath to avoid moisture damage. They also suggest maintenance as soon as the coating shows wear. That's sound advice, but it's also a real commitment.
Counting weekends, not just rands
Money is easy to compare. Time is harder, yet it's often what people regret most. Think about how you actually want to use your deck. For most families, that means braais, sundowners and kids running around barefoot, not scrubbing boards and waiting for coats to dry.
Then there's what happens when life gets busy. Maintenance slips, the finish fails and the timber underneath starts to grey and crack. Before long, a quick reseal turns into a sanding job, and sometimes into replacing boards altogether.
It's also worth thinking about safety. Weathered timber can splinter, and boards that cup or split become a trip hazard, especially for children and older relatives. As a result, a neglected deck isn't only an eyesore. It can quickly become a liability too.
Where composite changes the maths
Composite decking flips the cost curve. You'll often pay a little more at the start, but the running costs drop sharply. Our composite decking boards have a protective shell over a stable core, so they resist fading, staining, scratching and mould. They don't need sealing, and soap and water keeps them looking good.
They're also roughly 70% real wood fibre, so the boards still feel natural rather than plastic. Because of that high wood content, the colour may gently lighten over time. That's a natural feature of the material, and many owners love the softer, matured tone it settles into.
A few practical details also help keep installation costs predictable:
Boards come in standard 3 m and 6 m lengths, with custom lengths available.
Joists sit at 350 mm centres, and you'll need about 20 clips per square metre.
Each board is double-sided, with a grooved face and a woodgrain face.
Colours include Acacia Brown, Desert Rose, Camelthorn, Cinnamon, Hazelnut and Charcoal.
Is wood decking ever the better choice?
Sometimes, yes. If you enjoy hands-on maintenance, or you want a very specific hardwood, timber can be a lovely choice. Similarly, for a short-term structure or a house you plan to sell soon, the lower upfront cost may matter more than long-term savings.
For most homeowners planning to stay put, though, the sums lean towards composite. Over the life of the deck, you avoid the sealers, the sanding and much of the repair bill. You also get your weekends back, which is hard to put a price on.
Run the numbers on your own deck
Comparing wood decking and composite properly means looking at the whole lifespan, not just the invoice. Once you add up the coatings, repairs and hours, the cheaper option on paper often turns out to be the pricier one in practice.
Start with our decking estimator, which gives you an estimated board count, clip quantity and indicative material cost for your dimensions. Then contact the Acacia team for a quote or samples, and we'll help you plan a deck that looks good for years without eating your weekends.
