The short answer
Budget lap panels typically last 8–12 years, timber posts 10–15 years, quality panels on concrete posts 15–20 years and closeboard on concrete posts 20–25 years or more. Composite and galvanised metal fencing can last 20–30 years or longer. Good installation, concrete posts and regular treatment all extend the life of a fence.
When people ask how long a fence will last, the honest answer is “it depends” – mainly on the materials, the posts and how well it was put up. Two fences that look identical on day one can have very different lives.
This guide gives typical figures and explains what makes the difference.
Typical lifespans
These are typical ranges for fences that are reasonably well installed and maintained. Exposed coastal sites, wet soil and neglect can shorten them considerably.
- Budget lap or overlap panels: 8–12 years
- Timber posts (pressure-treated): 10–15 years, sometimes longer
- Quality panels on concrete posts with gravel boards: 15–20 years
- Closeboard on concrete posts: 20–25 years or more
- Composite fencing: 20–30 years
- Galvanised and powder-coated metal: 20–30 years or more
What makes a fence last
Posts are the most important factor. A fence with rotten posts has to be replaced even if the panels are fine – which is why concrete posts can more than double the life of a panel fence.
- Concrete posts, or Use Class 4 timber posts set properly
- Gravel boards keeping timber off the soil
- Pressure-treated rather than dip-treated timber
- Capping rails and post caps to shed rain
- Regular treatment every few years
- Keeping soil, leaves and plants off the boards
Signs a fence needs replacing
Leaning posts along the run, soft or crumbling timber at the base, panels that flex or have lost boards, and repeated repairs are all signs the fence is near the end of its life. If more than a few posts have failed, replacement is usually better value than patching.