Replacing Old Concrete Fence Posts in Newport

On the post-war and later estates around Newport, slotted concrete posts with panels dropped between them became the standard garden boundary. They were a good idea: concrete does not rot, and a panel can be swapped without touching the post. Many of those fences have now stood through a great many wet winters, and it shows.

If your fence has posts that are cracked, rusty-stained or leaning into the neighbour's garden, this guide explains what is going on, whether a repair is worth it, and how we replace them. For the general pros and cons of each post type, our guide to concrete posts or timber posts covers the basics. Here we focus on what we find in Newport gardens.

Why older concrete posts give up

A concrete fence post is reinforced with steel bars running along its length. While the concrete around them stays sound, the steel is protected. Once water finds its way in, through a hairline crack, a chip from a strimmer or poor original casting, the steel starts to rust. Rust takes up more room than the steel it replaces, so it pushes the concrete apart from the inside.

Heavy, wet ground, which a fair few Newport gardens have, keeps the base of the post damp for months at a time and speeds this up. Frost then opens any cracks a little further every winter.

• Orange or brown rust streaks running down the face of the post.
• Chunks of concrete flaking away to show bare, corroded steel.
• A crack right round the post at or just above ground level.
• The top of the slot crumbling so the panel no longer sits snugly.
• Posts that rock when you push the panel, or have already leant over.

Is it the post, the footing or the panel?

Before deciding anything, it is worth working out which part has actually failed. A leaning post that is itself in one piece may simply have a shallow or cracked concrete footing, often made worse by soft ground or a tree root. A post that has snapped clean through at ground level has failed in itself. And sometimes the posts are fine and it is the panels that have rotted or blown loose.

That distinction decides the cost and the work involved. We check each post along the run, because on an older estate fence it is common to find several that are fine, a couple that are cracking and one that has gone completely. Our guide fence repair or replacement explains how we weigh up the whole fence.

Three ways to deal with a failing post

Brace it with a repair spur. A short concrete spur can be set into the ground beside a post that has snapped at the base and bolted to it. It is a quick, low-cost fix for one or two posts on an otherwise sound fence, but it is a patch rather than a cure, and on a post that is rusting all the way up it only buys time.

Replace individual posts. Where most of the run is in good order, the failed posts can be dug out and new ones set in fresh concrete, reusing the gravel boards and panels if they are still in decent condition.

Replace the whole fence line. When a large share of the posts are cracking and the panels are tired as well, starting again is usually the better value over time. It also lets you change the style, height or post material in one go.

Getting the old posts out

This is the part people underestimate. Each old post sits in a lump of concrete, and on some Newport estates those footings are larger than you would expect. They have to be dug out or broken up, which is heavy, slow work, especially where the fence runs beside a shed, a tree or a neighbour's patio.

The old posts, footings and panels all have to be removed from site too. We take the waste away as part of the job, and where a garden is also overgrown along the boundary, a garden clearance first makes the fence work much quicker.

New concrete, or timber this time?

Plenty of people choose concrete again, and modern slotted posts with concrete gravel boards make a tidy, rot-free fence that is easy to re-panel. Others prefer the look of timber, especially with a close-board fence, which is stronger in the wind than panels. Good timber posts, set properly, can give a long life, though they will not last as long as sound concrete in wet ground.

Whichever you choose, the footings matter. In heavy or waterlogged soil, we dig deeper holes and make sure the concrete is shaped to shed water away from the post rather than letting a puddle sit round it. Our fencing and gates page shows the styles we put up across Newport and the valleys.

Neighbours and boundaries

Fences on Newport estates are often shared, and it is not always clear whose responsibility each one is. Your property deeds or title plan may show it, but many do not. Either way, it is worth talking to your neighbour before work starts, both to agree the plan and because we will need to work from their side for part of the job.

A like-for-like replacement on the same line is usually straightforward. If you want a taller fence, or the fence runs beside a road or footpath, check the height rules with Newport City Council first.

Timing the work

Fences can be replaced at almost any time of year, but a spell of dry weather makes digging out old footings easier and lets new concrete cure without the holes filling with water. If a hedge or climber is growing along the old fence, bear in mind that nesting birds are protected, so heavy cutting back is best done outside the main nesting season. Our guide to hedge trimming and nesting birds in Newport explains the timing.

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