How Long Does Decking Last?
If you’re about to invest in a new deck, or you’re wondering whether your existing one still has years left in it, the honest answer depends heavily on the material, how it was installed, and how well it’s been maintained since. Decking isn’t a one size fits all product, and lifespan varies more than most people expect. At JPD Landscaping & Building Services, we’ve installed and repaired decking across South East London for over 15 years. This guide is based on that real world experience, covering how long softwood, hardwood, and composite decking actually last, what causes decks to fail early, and how to get the most years out of yours. Decking Lifespan by Material Here’s a simple summary of what you can expect from each type of decking when it’s installed correctly and maintained reasonably well. Decking Type Typical Lifespan Maintenance Needed Softwood 15 to 20 years High (yearly staining or sealing) Hardwood (Balau, Ipe) 25 to 30+ years Low Composite 25 to 30 years Very low These figures assume a solid installation from the start. As we’ll cover below, poor installation is actually the biggest single reason decks fail well before these expected lifespans, regardless of material. Softwood Decking Lifespan Softwood decking, usually pressure treated timber, typically lasts 15 to 20 years when properly maintained. That maintenance is the key part of the equation. Softwood needs yearly staining or sealing to protect it from rain, and without that upkeep, boards can start greying, splitting, or warping much sooner, sometimes within just 5 to 7 years. If you’re considering softwood, it’s worth being realistic about the ongoing commitment. It’s a genuinely good value option, but only if you’re prepared to keep up with the yearly treatment schedule. Full guidance on softwood pricing and what drives the cost is covered in our decking cost guide, which is worth reading alongside this one if you’re still choosing between materials. Hardwood Decking Lifespan Hardwood decking, such as Balau or Ipe, is built for the long haul. In our experience, well installed hardwood decking regularly lasts 25 to 30 years or more, with minimal maintenance beyond an occasional clean. The dense natural grain of hardwood species makes them naturally resistant to rot, insects, and general wear, which is why they hold up so well over decades of UK weather. This longer lifespan is a big part of why many customers choose hardwood despite the higher upfront cost. Spread across 25 plus years, the cost per year often ends up lower than softwood once you factor in ongoing treatment and earlier replacement. Hardwood also tends to weather in a way that’s considered attractive rather than a sign of decline, developing a soft, silvery grey patina over many years if left untreated, or holding its rich brown tones indefinitely if oiled periodically. Composite Decking Lifespan Composite decking typically lasts 25 to 30 years, similar to hardwood, but with even less ongoing maintenance required. Because composite boards are manufactured from wood fibres and recycled plastic with a protective outer layer, they resist fading, staining, and moisture damage extremely well over time. Unlike softwood, composite doesn’t need yearly sealing, and unlike hardwood, it won’t naturally age or develop a slightly different look over the years, since the colour and finish stay consistent throughout its lifespan. Many manufacturers back composite boards with warranties ranging from 15 to 25 years, which gives a useful benchmark for how confident the industry is in the material’s long term performance, though it’s worth checking exactly what each warranty covers, since some only apply to structural failure rather than surface fading. Softwood vs Hardwood vs Composite: Lifespan Comparison Factor Softwood Hardwood Composite Typical lifespan 15 to 20 years 25 to 30+ years 25 to 30 years Maintenance required High Low Very low Appearance over time Fades, greys, needs treatment Ages naturally, still attractive Stays consistent Risk of early failure Higher without upkeep Lower Lower Typical warranty Rarely offered Varies by supplier 15 to 25 years common Lifespan figures like these are useful for budgeting, but they only tell part of the story. Two decks built from identical hardwood boards can have very different real world lifespans depending entirely on how the substructure underneath was built, which is exactly why installation quality deserves just as much attention as material choice. What Causes Decking to Fail Early? Material choice matters, but it’s not the whole story. Based on the repair and rebuild jobs we’ve handled over the years, a few issues come up again and again. Of all these, a weak substructure tends to cause the most serious and expensive problems, since it often isn’t visible until the deck starts to noticeably sag or feel unstable underfoot. The Substructure Is More Important Than the Boards It’s worth spending a moment on this point specifically, since it’s the single biggest factor separating a deck that lasts 10 years from one that lasts 30. The boards you walk on are only ever as good as the frame supporting them underneath. A properly built substructure should include correctly sized and spaced joists, appropriate for the span and the decking material being used, along with posts set on solid, adequately sized footings below the frost line. There should also be a deliberate drainage slope built into the design, so water is directed away from the structure rather than pooling underneath it, plus a gap maintained between the ground and the underside of the frame to allow airflow and prevent damp building up against the timber. When any of these elements are done poorly or skipped entirely to save time and cost, the visible decking boards can look perfectly fine for years while the frame underneath is quietly failing. This is exactly the pattern we see in the case study below. Case Study: Rebuilding a Deck After Early Substructure Failure We were recently called out to a garden in South East London where a softwood deck, installed by a previous contractor only six years earlier, had started sagging noticeably




