The short answer
A garden fence's life depends mostly on the posts and how the timber is protected. As a rough guide, a timber fence lasts around 10–20 years, with the panels often outliving timber posts set in soil, which can rot at ground level in 5–10 years. Concrete posts can last several decades, and composite fencing can last 20–30 years or more with little upkeep. The usual signs it is time to replace are posts that wobble or have rotted at the base, panels that are split, leaning or have blown out, and widespread grey, soft or flaking timber. When a post snaps or a fence comes down in a storm, replacing the affected bays — ideally onto concrete posts — is normally a better-value fix than repeatedly re-fixing failing timber.
Most fences fail at the posts, not the panels. Knowing the typical lifespans and the warning signs helps you decide whether a repair will hold or whether it is time to replace.
Typical lifespans
- Timber fence~10–20 years
- Timber post in soil~5–10 years (rots at base)
- Concrete postseveral decades
- Composite fence~20–30+ years
- Biggest factorthe posts, not the panels
What determines how long a fence lasts
- Posts: the usual failure point. Timber posts set straight into soil rot at ground level; concrete posts, or timber in a post-support, last far longer.
- Timber treatment: pressure-treated panels and an occasional re-treat hold off rot; untreated or neglected timber greys and softens faster.
- Ground & water: a gravel board keeps the panel clear of wet soil; without one the bottom of the panel sits in water and rots first.
- Exposure: a windy, open boundary takes more punishment than a sheltered one.
When to repair and when to replace
A single cracked panel or one loose post on an otherwise sound fence is usually a repair. It tips into replacement when several posts are rotten or moving, panels are leaning or blowing out along the run, or the timber is widely soft and grey. After a storm, a snapped timber post is a clear signal: re-fixing it rarely lasts, whereas replacing the affected bays onto concrete posts and a gravel board usually gives a far more durable result. Because the labour and access are much the same either way, replacing a failing run as a set is often better value than paying repeatedly for patch repairs.
Fence failing or storm-damaged?
We'll match you with a vetted fencing installer who assesses whether to repair or replace and quotes on a clear specification — including concrete posts if your run keeps failing.
Frequently asked questions
How long does a garden fence last?
A timber fence typically lasts around 10–20 years, though timber posts set in soil often rot in 5–10 years. Concrete posts can last several decades and composite fencing 20–30 years or more with little upkeep.
When should I replace rather than repair a fence?
Replace when several posts are rotten or moving, panels are leaning or blowing out along the run, or the timber is widely soft and grey. A single cracked panel or one loose post is usually just a repair.
Why does my fence keep blowing down?
Usually because the posts have rotted or are too weak for the exposure. Switching to concrete posts with a gravel board, which keep the timber clear of wet ground, is the change most likely to stop it recurring.
Sources & further reading
Figures on this page are typical UK ranges drawn from published sources and depend on your specific garden. They are guidance, not a quotation.