Stabilise loose panels and heavy gates first
Stop work if a fence could fall onto people, vehicles or a public area. Check for buried services before digging around posts.
MOST LIKELY CAUSES
Start with posts, fixings and alignment
Rot at ground level
Timber decays where moisture collects.
Cracked concrete footing
The post base moves inside broken concrete.
Loose soil
The footing has shifted or was too small.
Wind loading
Repeated force has weakened the base.
Symptom variations Match the movement, lean or latching pattern. ⌄
- Post moves independently
- Concrete lifts or cracks
- Timber feels soft near ground
- Fence leans after storms
- Movement worsens when panels are attached
Quick checks Safe checks before dismantling the fence or gate. ⌄
- Push the post gently in several directions.
- Probe timber at ground level carefully.
- Inspect concrete for cracking.
- Check neighbouring posts.
- Look for drainage or persistent wet ground.
Important:
Correct failed posts and structure before adjusting panels, hinges or latches.
Step 1 — Determine whether timber or footing failed Make the smallest safe correction and retest. ⌄
The repair depends on which part is weak.
Step 2 — Stabilise the fence Make the smallest safe correction and retest. ⌄
Support adjacent panels before removing fixings.
Step 3 — Repair or replace the post Make the smallest safe correction and retest. ⌄
Use a repair spur only where the remaining post is sound enough.
Why the problem happens How wind, weight, moisture and fixings affect the structure. ⌄
The ground line is the highest-risk area because timber, moisture and movement meet there.
Advanced checks Further diagnosis for persistent outdoor faults. ⌄
- Check footing depth.
- Assess soil drainage.
- Measure post section.
- Inspect concealed rot below ground.
- Check whether heavier panels overload the post.
Tools and information needed Useful items for accurate checks. ⌄
- Spirit level
- Spade
- Pry bar
- Temporary braces
- Drill
Parts that may need replacing Common fencing and gate components linked to this fault. ⌄
- Concrete repair spur
- New post
- Postcrete or concrete
- Exterior bolts
- Post cap
When to call a professional Conditions that should end basic DIY diagnosis. ⌄
- The fence borders a road or footpath.
- Several posts have failed.
- Utilities may be buried nearby.
- The post supports a heavy gate.
- Major excavation is required.
Frequently asked questions Common fence and gate questions. ⌄
Can a concrete spur save the post?
Yes, if enough sound timber remains above ground.
Should I pour more concrete around it?
Not without removing loose material and identifying the failure.
Why do posts rot at ground level?
That area stays damp and receives repeated splashback.