How Long Does a Timber Fence Last in Sydney?
Updated: Oct 5
Most timber fences in Sydney last somewhere between about 10 and 20 years, and in almost every case the posts give out well before the palings do. If your fence is leaning, wobbling or dropping at one end, the timber above ground is usually still fine. It is what is happening at ground level that decides when the whole thing has to come out.
The short answer
As a rough guide, based on what we pull out and replace across Sydney: treated pine paling fences commonly run about 10 to 15 years; hardwood palings on hardwood posts can push 15 to 25 years; and a fence with posts set badly, or sitting somewhere that stays wet, can be finished in well under 10. Two fences built in the same week on the same street can end up a decade apart purely because of drainage and how the posts were set.
Why the posts fail first
A timber post rots in a narrow band either side of ground level. Below that the soil holds moisture but little oxygen; above it the timber dries out. Right at the interface you get both, plus fungi, and that is where the post goes soft. Tap along a post with a hammer and you will often find solid timber at the top and bottom and a spongy waist in the middle.
That is why a fence can look perfectly sound from the street and still be structurally finished. Once several posts have gone at the base there is nothing holding the line, and replacing palings will not fix it.
What the timber itself changes
Treated pine
Treated pine is graded by how deep the preservative goes and where it is rated to be used. H4 is the rating intended for in-ground fencing use; H3 is for outdoor above ground. A pine post rated for above-ground use and then buried is one of the most common reasons we see a fence fail early. If you are buying materials yourself, check the treatment stamp on the end of the post rather than taking a yard's word for it.
Hardwood
Australian hardwoods are rated by natural durability class, and a high-durability hardwood post will generally outlast treated pine in the ground. Hardwood palings also hold their shape better on long runs. They cost more and they are heavier to work with, which is the trade-off.
If you are weighing timber against steel before you commit, our Colorbond vs timber fencing comparison goes through both side by side, and our timber paling fence guide covers paling and post choices in more detail.
Five things that decide how long yours lasts
Drainage. A post sitting in ground that stays damp after rain will not last as long as the identical post three metres away on free-draining sand. Downpipes discharging near a fence line are a classic culprit.
How the posts were set. A footing that traps water against the timber shortens a post's life. Good practice is a footing that drains and a concrete collar shaped to shed water away from the post rather than cup around it.
Soil and garden contact. Raised beds, mulch and lawn built up against palings keep the bottom of the fence permanently damp. A gravel strip or a small gap does more for lifespan than any coating.
Exposure. West and south-west faces cop the worst of the weather here. Close to the coast, salt-laden wind attacks fixings long before it bothers the timber, so nails and screws can rust out while the boards are still good.
Maintenance. Clearing debris off the base, keeping soil away, re-fixing loose palings and re-coating when the finish goes chalky all add years. None of it is difficult, but it has to actually happen.
Our fence maintenance guide for Sydney homes runs through the jobs that are genuinely worth doing and the ones that make no real difference.
Sydney conditions that shorten a timber fence
Around the Sutherland Shire and the Eastern Suburbs, salt and sandy soil are the main factors: fixings corrode and footings can move. On the heavier clay through Canterbury-Bankstown and the Hills District, ground movement between wet and dry seasons works posts loose over time. In the Inner West, older fence lines often sit against retaining that was never designed to be permanent, and the fence ends up carrying load it was never meant to. None of these ruin a fence on their own; they move the timeline.
If you want to know what we usually strike in your part of Sydney, the areas we service page lists them.
Signs your fence is near the end
Posts that move when you push the fence at the top, or sound hollow when tapped near ground level.
A fence line that has gone out of plumb or developed a wave along its length.
Palings splitting around the nails rather than simply weathering grey on the surface.
Repeated repairs in the same section. Two or three patches in a couple of years usually means the structure, not the boards, is the problem.
Gates that will not stay square no matter how often the hinges are adjusted.
If you are not sure whether you are looking at repairs or a replacement, when to replace a fence in Sydney walks through how we make that call on site.
Can you extend the life of the fence you have?
Often yes, and it is usually worth trying before you replace a whole boundary. Sound posts with tired palings are a straightforward re-clad. An individual failed post in an otherwise good fence can be replaced. Keeping soil, mulch and stacked items off the base costs nothing. What does not work is coating a post that is already soft at the base, or re-cladding a fence whose posts have only a year or two left, because you end up doing the job twice.
Where the structure is still good, fence repairs are a far better use of money. Where it is not, a fence replacement done once properly will outlast a run of patches.
One thing worth knowing about shared fences
If the fence sits on a boundary you share with a neighbour, replacing it is generally a shared matter in NSW rather than something one owner simply decides. The rules, the notice process and what happens when you cannot agree are set out by NSW Fair Trading and LawAccess NSW, and we would point you there rather than offer an opinion on your particular situation.
Our guide to who pays for a dividing fence in NSW covers that process in plain terms.
Want a straight answer on your fence?
We install and replace timber fencing across Sydney, and a fair bit of what we do is telling homeowners their fence has a few years left in it yet. If you would like someone to check the posts and give you an honest read, get in touch for a quote. You can also see the full range of fencing we build.
Frequently asked questions
How long does a treated pine fence last in Sydney?
Commonly around 10 to 15 years for a paling fence built with correctly rated in-ground posts and looked after. Posts that were not rated for in-ground use, or that sit in ground staying wet, can fail considerably sooner.
Does painting or oiling a timber fence make it last longer?
It helps the palings and the visible timber and is worth doing. It does very little for the part that usually fails, which is the post at ground level. Treat coating as protection for the boards, not as a way to extend the structure.
Can I just replace the rotten posts instead of the whole fence?
Sometimes. If one or two posts have gone and the rest are sound, replacing them is sensible. If posts are failing along the run, the others are the same age in the same ground, so you are usually buying a short delay.
Is hardwood worth the extra cost over treated pine?
If you want the longest life from a timber fence and are happy with the higher up-front cost, hardwood posts are the single best place to spend the extra. A common middle path is hardwood posts with pine palings.
How long does a Colorbond fence last compared with timber?
A steel fence generally outlasts timber and needs far less maintenance, though it is damaged differently and coastal exposure still matters. Our Colorbond vs timber comparison and our guide to the best fence for coastal Sydney homes both cover that choice.
Read next: Hardwood vs treated pine fencing in Sydney
Also worth reading: Painting a Picket Fence: A Sydney Guide
Shaded, established gardens change how timber ages - see fencing on the Lower North Shore.
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