At a glance
A broken fence is one of the most common and most urgent DIY jobs facing UK homeowners – whether it is a panel blown out by winter storms, a post that has rotted at ground level, or gravel boards that have given way after years of contact with wet soil. A broken boundary fence is a security, privacy and often a neighbourly issue that needs resolving promptly. Most fence repairs are well within the capabilities of a competent DIYer with basic tools, and understanding which component has failed determines whether a repair or a full replacement is the right approach.
The key to a fence repair that actually lasts is addressing the underlying cause rather than patching what is visible. A panel replaced on a rotten post will fail again within a season. A post repaired using a spike without dealing with the rot in the concrete base will follow the same path. This guide covers every component in turn – panel, post, gravel board, arris rail – and explains the right fix for each type of failure. If the damage is extensive enough that replacement makes more sense than repair, the separate guide on how to build a garden fence covers the full construction process.
Assessing the damage and checking ownership
Before touching anything, establish who owns the fence. In the UK there is no automatic rule that assigns ownership by left side, right side, or which way the posts face. The only reliable way to determine fence ownership is to check your title deeds and property plan. Look for a T-mark on the boundary line – the foot of the T points toward the owner who is responsible for that boundary feature. If no T-mark exists, ownership is ambiguous and the fence may be a shared responsibility. If you cannot locate your title deeds, a copy of the title register is available from HM Land Registry. Repairing or replacing a fence that belongs to your neighbour without agreement can create dispute – establish ownership first, then notify your neighbour of the work even if the fence is clearly yours.
Always check ownership before starting work. Look for a T-mark on your title deeds – the foot of the T points toward the owner responsible for that boundary. An H-mark (two T-marks back to back) means shared responsibility. If the deeds have no marking, treat the boundary as shared and agree the work with your neighbour before beginning.
What you’ll need
Replacing fence panels
Replacing a fence panel is straightforward if the posts are sound. Standard UK fence panels are 1.83m wide and come in heights from 0.9m to 1.83m. Measure the gap between posts carefully before ordering – gaps are often not exactly 1.83m on older fences that have settled or shifted, and ordering a panel that is even 2cm too wide is a common and avoidable mistake.
With sound posts confirmed, remove the old panel by prising away any panel clips, nails or screws fixing it to the posts. Most lap panels simply lift out of grooves in the posts or are held by battens screwed to the post face. Have a second person available to support the panel as it is removed – fence panels are awkward to handle solo and easily damaged if dropped. Before fitting the new panel, check that any fixing battens are rot-free and replace them if necessary. Slide the new panel into position, check it is level, and fix with galvanised panel clips or screws. Treat any exposed cut edges of timber with preservative before fitting.
Fixing or replacing fence posts
A rotten fence post is the most common cause of fence failure in the UK. Posts rot fastest at ground level where timber meets soil and moisture is trapped. There are two viable options depending on how much sound timber remains above ground.
A post repair spike is a metal bracket system that bolts to the surviving sound timber above the rot line and drives into the ground beside the old post. This avoids digging out the old concrete base entirely and works well when there is at least 60cm of sound timber remaining above ground. The repair spike is a legitimate solution for a post that has rotted at the very base but is otherwise sound – it is not a patch job, it is a proper structural fix when correctly specified and installed. Brands including Postfix and Metpost make widely available repair spikes for standard post sizes.
Full post replacement is the right approach when rot has progressed significantly into the post body, when the post has snapped rather than rotted, or when the existing concrete base has heaved or cracked. The process is more involved but produces a stronger, longer-lasting result.
When digging out the old post, break out the concrete base using a cold chisel and lump hammer or a hired electric breaker. Dig the new hole at least 60cm deep for a standard 1.8m fence – one third of the total post length should be underground. Put 100mm of gravel or hardcore at the base of the hole to aid drainage. Set the new post plumb on two adjacent faces using a spirit level, brace with temporary timber props, then pour Postcrete around the post following the manufacturer’s instructions. Postcrete sets in approximately 10 minutes but allow at least 24 hours before attaching panels and applying lateral load to the post. Slope the top of the set Postcrete away from the post to shed rainwater.
Check plumb before Postcrete hardens – you have minutes not hours. Once Postcrete begins to set there is no adjusting the post position. Have a second person hold the post, check plumb on both faces with a spirit level before the mix reaches the stiffening stage, and brace it in position with scrap timber until fully set.
Gravel boards and bases
Gravel boards sit at the base of the fence between the posts, keeping the panel off the soil and preventing the ground-level rot that ends the life of most timber fences. They are the most rot-prone component in a standard timber fence because they are in direct contact with wet ground. Timber gravel boards typically last 5 to 10 years before needing replacement. When replacing them, also consider cutting a small 13cm square gap at the base of one panel to create a hedgehog highway – a worthwhile addition to any fence repair. Fitting concrete or composite gravel boards when next replacing panels or posts is a worthwhile upgrade – concrete gravel boards last indefinitely, are unaffected by ground moisture, and remove the most vulnerable component from the equation entirely. The cost difference between timber and concrete gravel boards is modest relative to the total cost of a fence replacement.
When fitting concrete gravel boards, they slot into channels in the concrete or timber posts. For timber post fences being upgraded, you will need to check whether the existing post channels are the right width – standard concrete gravel boards are typically 150mm x 50mm in cross section. If the post channels are too narrow, timber battens can be screwed to the post face to create a channel of the right width to accept the concrete board.
Treating and preserving timber
All new timber fence components should be treated with a quality wood preservative before installation. This is particularly important for any cut ends, which expose the end grain and absorb moisture far more readily than the treated surfaces. Cut ends from saw cuts made on site are the weak point in any new fence – the factory pressure treatment does not penetrate the newly exposed face. Apply preservative to every cut end with a brush before fixing in position, and allow to soak in before installing.
Applying preservative every two to three years extends fence life dramatically. The most common cause of premature fence failure is not storm damage – it is neglected timber that has been allowed to dry, crack and absorb moisture without any protective treatment. A pressure-treated fence that is regularly re-treated will outlast one installed to a higher specification but never maintained. Adding a trellis topper to a repaired fence is also worth considering at this stage – once the posts are confirmed sound, fitting a trellis panel above the fence adds privacy and a climbing frame for plants with minimal additional effort. The work takes an afternoon per 10 metres of fencing and the materials cost very little relative to fence replacement.
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