Repair vs Replace Fence Cost

Understanding repair vs replace fence costs in Australia

The neighbour is part of the decision

Fences are unusual because the law brings a second party into your repair or replace choice. Every Australian state and territory has dividing fences legislation, whether that is the Dividing Fences Act in Queensland and Western Australia, the Fences Act in Victoria, or the Dividing Fences Act in New South Wales, and the common thread is that adjoining owners share the cost of a sufficient dividing fence. Sufficient is the key word. Your neighbour is liable for half of a reasonable standard fence, not half of the powder coated aluminium slat design you prefer, and the difference is on you. Just as important, entitlement to that half almost always depends on serving written notice with quotes before the work happens.

The age threshold by material

Treated pine paling fences typically last 12 to 20 years in Australian conditions, hardwood palings 20 to 30, Colorbond 20 to 30 inland and closer to 15 to 20 within a few kilometres of the surf where salt attacks the coating at the cut edges and the ground line. Rural wire and post fencing can run 20 to 40 years. Masonry lasts fifty years or more but fails structurally rather than gradually, usually from footing movement. What fails first on almost every timber and steel fence is the post at the soil line, because that zone has both oxygen and moisture, which is exactly what rot and rust need. The palings usually look worse but last longer.

The one third rule for posts

The most useful practical threshold for fences is not a dollar percentage, it is a post count. Replacing one rotted post costs roughly $180 to $320 because the panels either side have to come off and go back on. In a thirty metre fence with posts at 2.4 metre centres you have about thirteen posts. Replacing two is $400 to $650 and clearly worth it. Replacing five is $900 to $1,600 and you still have an old fence with eight aging posts. A new Colorbond fence over the same thirty metres is $2,850 to $5,100, halved with the neighbour to $1,425 to $2,550. Once a third of the posts have gone, replacement is usually both cheaper and better.

Asbestos in pre 1990 fibro fences

This deserves specific attention because fibro fences are still common in older Australian suburbs and are widely misunderstood. Fibre cement sheeting manufactured before 1990 frequently contains bonded asbestos, and asbestos was not fully banned in Australia until the end of 2003. Bonded asbestos in good condition is not dangerous, because the fibres are locked into the cement matrix. It becomes dangerous the moment it is broken, drilled, cut, sanded or high pressure washed, all of which release respirable fibres. A cracked or crumbling fibro fence is therefore not a repair job. Do not water blast it, do not attempt to patch it, and have it assessed. Removal must follow state work health and safety rules, and many councils run subsidised residential asbestos disposal days that materially cut the cost.

Repair costs that genuinely work

Some fence repairs are excellent value and are underused. A galvanised steel post spur bolted to the sound part of a rotted timber post and concreted alongside it costs $120 to $200 and can add a decade to a fence with good rails and palings. Refixing sagging rails and renailing loose palings across a run costs $150 to $400 and stops the cascade where one loose paling lets wind get behind the next. Staining or oiling timber every three to five years at $12 to $22 per lineal metre demonstrably extends paling life. Colorbond fences are modular, so a damaged sheet slides out and a new one slides in for $70 to $140, provided you can still match the colour name.

What a replacement actually costs in 2026

A standard 1.8 metre treated pine paling fence installed runs roughly $90 to $150 per lineal metre in Australian metro areas, and Colorbond runs $95 to $170 depending on colour, height and post spacing. Both figures assume reasonable access, no significant slope and no removal of masonry or concrete footings. Add cost for sloped ground requiring stepped or raked panels, for removing an existing fence and disposing of it at roughly $15 to $30 per lineal metre, and for rock or difficult ground that slows post holes. Gates are priced separately at $350 to $900 for a standard pedestrian gate and $900 to $2,500 for a double or sliding vehicle gate.

When a repair only defers the same spend

The pattern is familiar. A paling snaps, you replace it. Two months later two more go. Then the fence starts leaning. Each individual repair is cheap and reasonable and you never make a decision, and across three years you spend more than half the price of a new fence while still owning the old one. The tell is repeated repairs to different sections rather than the same section, because that means the whole run has reached the same age and is failing together. At that point stop, serve the fencing notice, get two quotes, and replace once with the cost shared as the legislation intends.