How to Install Garden Fencing That Lasts

A garden fence can look perfectly straight on the day it is fitted, then start leaning after the first hard Edinburgh winter if the posts have not been set properly. Learning how to install garden fencing is less about simply fixing panels in place and more about getting the line, foundations and drainage right from the start.

A well-built fence gives privacy, keeps pets and children safely within the garden, and provides a smart edge for patios, lawns and flower beds. It also needs to stand up to wind, rain and the occasional uneven garden that is common across Edinburgh and the Lothians.

Plan the fence before buying materials

Start by deciding exactly what the fence needs to do. A low decorative boundary fence needs far less support than a 1.8-metre privacy fence exposed to wind. Closeboard fencing is a good choice where strength matters, while timber panels can give a neat, consistent finish and are often quicker to fit. Slatted fencing looks modern, but it needs accurate spacing and a solid frame behind it.

Measure the full run of the fence, including gates, corners and changes in level. Do not rely on a rough pace across the garden. Use a tape measure and make a simple sketch showing post positions. Standard panels are commonly 1.83 metres wide, but measure the actual panels you intend to use. Small differences quickly add up and can leave an awkward gap at the end.

Check where the legal boundary sits before removing an old fence or digging holes. Title plans, boundary markers and discussion with neighbours can help prevent a straightforward garden job becoming a dispute. If the fence fronts a road, is near a listed property or falls within a conservation area, check whether planning restrictions apply before work begins. It is also sensible to establish who owns the existing boundary fence rather than assuming it is yours to replace.

Materials and tools for a lasting installation

The right materials depend on the fence style, ground conditions and exposure. Pressure-treated timber is the usual choice for garden fencing, but treatment does not make poor installation acceptable. Timber that sits in wet ground or has cut ends left untreated will not last as long as it should.

For most timber-panel or closeboard jobs, you will need:

• Treated timber or concrete fence posts, plus panels or rails and boards

• Gravel boards to keep timber panels clear of damp soil

• Postcrete or a suitable concrete mix, along with clean aggregate where required

• Exterior-rated screws, galvanised fixings, brackets and post caps

• A string line, tape measure, spirit level, spade, post-hole digger and saw

Concrete posts and gravel boards are a practical option for exposed gardens and areas where long-term maintenance needs to be kept low. They are heavier to handle and can look more utilitarian, but they resist rot and work well with standard timber panels. Timber posts can suit a more traditional garden and are easier to cut or adapt on sloping ground, provided they are properly treated and set securely.

Mark a straight line and set out the posts

Run a taut string line between the first and last post position. This is your guide for a clean, straight fence line. Do not follow the line of an old fence without checking it first. Previous fencing may have moved over time, or it may not have been built on the correct boundary.

Mark each post centre along the string. Keep the spacing consistent with the width of your panels, remembering that brackets, post thickness and gate openings affect the final measurement. On a run with a corner, set the corner post first and run separate string lines from it in each direction.

For a sloping garden, decide whether the fence will step down in levels or follow the slope. Stepped panels keep their top edges level and are generally easier to install. A raked fence follows the angle of the ground and can look neater on a gentle slope, although panels may need to be purpose-made or cut and rebuilt on site.

Dig post holes deep enough for the ground

The strength of the whole fence comes from the posts. As a working guide, set around one-third of the post length below ground. A typical 1.8-metre fence may therefore need posts around 2.4 metres long, with holes roughly 600 millimetres deep. Taller or more exposed fencing may need deeper, wider holes.

Dig each hole wide enough to allow concrete around the post, usually around 250 to 300 millimetres across for a standard domestic post. Remove loose soil from the base. If the ground is soft, wet or recently disturbed, allow for a larger footing and consider whether additional drainage or a different fence design is needed.

Avoid trapping the bottom of a timber post in a puddle. A little coarse gravel at the base can help drainage, but it does not replace a firm concrete surround. Take particular care in heavy clay soil, where water can sit around the post for long periods.

How to install garden fencing posts correctly

Set the first end post in its hole, checking it in two directions with a spirit level. Brace it temporarily with timber stakes before adding concrete. Once the post moves out of plumb, it is difficult to correct after the mix starts to set.

Add the concrete around the post and compact it as you go, following the product instructions if using a rapid-setting post mix. Finish the top of the concrete with a slight slope away from the timber. This encourages rainwater to run off rather than collect against the post.

Set the opposite end post next, using the string line to confirm both position and height. Then install the intermediate posts one at a time. Check every post for level and alignment before moving on. This may feel slow, but it is where tidy, professional-looking fencing is won or lost.

Leave the concrete to cure for the recommended time before hanging panels or loading the posts with rails. Rapid-setting products can firm up quickly, but a fence exposed to wind should not be rushed into service before the footing has gained enough strength.

Fit gravel boards, panels and rails

Gravel boards are not just a finishing detail. They keep timber panels and lower rails away from soil, leaves and standing water, reducing the chance of early rot. Concrete gravel boards sit neatly between slotted concrete posts. With timber posts, they can be fixed to the posts or supported using suitable brackets.

Lift fence panels into place carefully. Panels are awkward and can be damaged if dragged across paving or turf, so having a second person on site is safer and makes it easier to keep everything level. Fix panels with galvanised or exterior-grade screws and purpose-made brackets rather than relying on a couple of nails.

For closeboard fencing, install horizontal arris rails between the posts, then fix the vertical feather-edge boards with a consistent overlap. Keep the first board plumb and use it as the reference for the rest. Fit capping along the top if required, as this gives a cleaner finish and helps shed water.

If you are fitting a gate, use a stronger gate post and allow enough clearance for the gate to swing freely above the ground. Gates put repeated strain on posts, especially in wet weather, so lightweight hinges and undersized posts are false economy.

Finish the job neatly and protect the garden

Trim any rough timber ends and apply an end-grain preservative to fresh cuts. Add post caps to reduce water getting into the tops of timber posts. A fence does not need to be painted immediately if it is pressure treated, but a suitable exterior stain or paint can provide the colour and finish you want once the timber has dried to the manufacturer's guidance.

Clear away soil, broken concrete, timber offcuts and packaging as work progresses. Re-level disturbed ground and reinstate turf or gravel at the base of the fence. Good fencing should improve the garden, not leave a strip of mess for the homeowner to deal with afterwards.

For short, sheltered runs, careful DIY installation can be a satisfying project. Long boundaries, steep slopes, difficult access, old walls, drainage issues and wind-exposed gardens are often better handled by an experienced fencing contractor. K Vincent Plastering & Landscaping Edinburgh can provide a clear quote for fencing work alongside patios, walling and wider garden improvements, with the site left clean and tidy when the work is complete.

Take your time on the set-out and posts, because those hidden foundations are what keep a new garden fence looking straight long after the first winter has passed.