Concrete vs timber fence posts: which is better? (UK guide)

The short answer

Concrete posts last longest and need no maintenance; timber posts look better and are cheaper and easier to fit. Concrete posts will not rot and routinely outlast the panels they hold, often 25 years or more, and slotted concrete posts let you slide panels in and out without nails or brackets. Timber posts are warmer-looking, lighter to handle and cheaper up front, but rot at the ground line and typically last around 10–15 years unless well treated. For a long-lasting, low-maintenance boundary, concrete posts usually win; for appearance and lower cost, timber posts appeal.

Most timber fences fail at the posts, not the panels — so the post choice often matters more than the panel style. The two standard options are concrete and timber, and each has a clear set of strengths.

Concrete vs timber posts

Concrete postsLongest life, no rot, no maintenance
Timber postsBetter looks, cheaper, easier to fit
Typical concrete life~25 years or more
Typical timber life~10–15 years
Common pairingConcrete posts + gravel board + any panel

Lifespan and maintenance

This is where concrete posts are hard to beat. Reinforced concrete does not rot, is not eaten by insects, and shrugs off ground moisture — the very thing that destroys timber. A concrete post commonly lasts 25 years or more and will usually outlive several sets of panels. It needs no treatment, painting or upkeep at all.

Timber posts, by contrast, fail at the ground line, where wet soil and air meet. Even pressure-treated posts eventually rot through at this point, and a snapped post in a storm is one of the most common fence failures. A good treated timber post might last 10–15 years; a poorly treated one far less. Posts can be protected with post savers, concrete spurs or metal post supports, but they will never match concrete for sheer longevity.

Strength, cost and appearance

Each material trades off against the others:

Strength: concrete posts are heavy and rigid, giving a very solid, secure boundary that resists wind and impact well. Timber posts are strong when new but weaken as they age and rot.
Cost: timber posts are cheaper to buy and lighter to transport and handle. Concrete posts cost more individually and are heavy, but their long life can make them better value over the lifetime of the fence.
Appearance: timber posts look natural and blend with wooden panels — many people simply prefer the warmth of an all-timber fence. Concrete posts are grey and more utilitarian, though they can be hidden behind the panels or painted.

Factor	Concrete posts	Timber posts
Lifespan	~25 years+, no rot	~10–15 years, rots at ground line
Maintenance	None	Treat/re-treat to extend life
Strength	Very high, rigid	Good when new, declines with age
Weight/handling	Heavy, harder to lift	Light, easy to handle
Cost	Higher up front	Lower up front
Looks	Grey, utilitarian	Natural, blends with timber panels

Indicative comparison for UK garden fence posts; lifespan depends on timber treatment, ground conditions and exposure.

Installation and replacing panels

Fitting differs in important ways. Slotted concrete posts have a channel down each side, so panels slide in from the top and are held without nails, screws or brackets. This makes future panel replacement very easy — lift out the old panel, drop in a new one. Concrete posts are heavy to manoeuvre and need a well-dug, concreted hole, but once set they are extremely stable.

Timber posts are lighter and quicker to set, and panels are fixed to them with clips, brackets or nails. That fixed connection is fine, but replacing a panel later means unscrewing or prising it off rather than simply sliding it out. Timber posts can be set in concrete, in a dry-mix postcrete, or into metal post anchors driven into the ground.

A common hybrid: many UK fences use concrete posts and a concrete gravel board with timber panels on top. This keeps the rot-prone parts off the ground while preserving the look of a wooden fence — often the most durable, sensible compromise.

Setting the posts: depth, concrete and the ground line

However good the post, it is only as strong as the hole it sits in, and this is where many fences are lost. As a rule of thumb, around a quarter to a third of the post should be below ground — for a standard 6ft fence that usually means digging a hole roughly 600mm (2ft) deep, and deeper still for taller or exposed boundaries. A post set too shallow will lever out in the first real storm no matter what it is made of.

For timber posts, the base sits in the wettest part of the fence, so how you set it matters. A fast-setting post mix (postcrete) is convenient and firm, but the join between post and concrete can trap water against the timber. Sloping the top of the concrete collar away from the post so rain runs off, and adding a post saver sleeve or sitting the post on a bed of gravel for drainage, all slow the ground-line rot that eventually claims timber posts. Metal post anchors — spiked or bolt-down — keep the timber clear of the soil entirely and suit lighter or temporary fences.

Concrete posts are heavy and unforgiving to handle but simpler in principle: set them plumb in a generous concreted hole, brace them while the mix cures, and they will not move for decades. Because they do not rot, the only real failure point is the foundation itself, so a deep, well-compacted, properly concreted hole is what makes a concrete-post fence effectively permanent.

Depth beats material: a third of the post in the ground, set in a firm concreted hole, does more for a fence's survival than the post material alone. A shallow concrete post still fails in a storm; a deep, well-drained timber post lasts surprisingly well.

Repairing a failing post without rebuilding the fence

When a fence starts to lean, it is almost always the post that has gone, not the panels — and you usually do not need to dig everything out to fix it. The most useful repair is a concrete repair spur (sometimes called a godfather post): a short reinforced concrete post that is concreted into the ground alongside the failing timber post and bolted to its sound upper part. The spur takes over the job the rotted base used to do, re-anchoring the post and the panel without disturbing the rest of the run. It is a common, economical fix for a timber post that has snapped or rotted at the ground line while the panels above are still good.

Other options suit different situations. Metal post anchors or repair spikes can re-seat a lighter post; bolt-down brackets work where there is concrete or paving beneath. Where a slotted concrete post itself has cracked — far rarer, but it happens with impact or a shallow original setting — replacement usually means removing the panels either side and digging out the old concrete footing, which is heavier work, so concrete posts are best got right at installation.

The practical lesson is that the post, not the panel, is where money and attention belong. A timber-post fence can often be kept going for years with spurs and base protection rather than a full rebuild, while a concrete-post fence rarely asks for anything at all once it is properly set. Either way, recognising that a leaning fence is a foundation problem — and fixing the post rather than buying new panels — is what saves the most money over a fence's life.

Fix the post, keep the panels: a leaning fence is almost always a failed post. A bolted-on concrete repair spur re-anchors a rotted timber post for a fraction of the cost of digging it out — and sound panels need not be replaced at all.

Which posts should you choose?

The decision usually comes down to how much you value longevity and freedom from maintenance against cost and appearance:

Choose concrete posts if you want the longest-lasting, lowest-maintenance boundary, the fence is exposed to wind, you want to be able to swap panels easily in future, or you are tired of replacing rotted timber posts.
Choose timber posts if you want a natural all-wood look, the budget is tight, you need to handle and set the posts yourself without heavy lifting, or the fence is a lower-priority or temporary boundary.

For most permanent garden boundaries in the UK, concrete posts paired with a gravel board are the durable default, because they solve the ground-line rot problem that ends most timber fences early. Where the look of solid timber matters more than maximum lifespan, well-treated timber posts — ideally protected at the base — remain a reasonable and cheaper choice. Whatever you pick, setting the posts deep enough and firmly enough is what keeps the whole fence standing through winter storms.

Frequently asked questions

Do concrete fence posts last longer than timber ones?

Yes, by a wide margin. Concrete posts do not rot and commonly last 25 years or more, often outliving several sets of panels. Timber posts rot at the ground line and typically last around 10–15 years even when pressure-treated.

Can I use timber panels with concrete posts?

Yes, and it is a very common UK combination. Slotted concrete posts let you slide timber panels in from the top, while a concrete gravel board keeps the panel base off wet ground. You get the look of a timber fence with the durability of concrete posts.

Why do timber fence posts rot first?

Posts fail at the ground line, where soil moisture and oxygen meet — the ideal conditions for rot. The buried section and the panel can still look sound while the post snaps at the surface. Post savers, concrete spurs or metal anchors help protect this weak point.

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.