Gate Installation Guide
How to Repair a Sagging or Damaged Gate
A gate that drags, drops or no longer closes properly may be caused by loose hinges, weak posts, damaged timber or incorrect bracing. This guide explains how to identify the problem, carry out common repairs and decide when replacement is the better option.
In this guide
Assessing the Problem
Before starting any repair, identify what is causing the gate to drop, drag or stop closing properly.
Common causes include:
- Loose hinge fixings
- Hinges that are too small
- A weak or moving hanging post
- Rotten timber
- A split gate frame
- Incorrect diagonal bracing
- A gate that is too heavy for its fittings
- Ground movement
- Swollen timber
- A damaged latch or bolt
- A gate that has been struck or forced
- Wind damage
Check the gate in both the open and closed positions.
Look for:
- The latch side sitting lower than the hinge side
- Uneven gaps around the gate
- Loose or bent hinges
- Screws pulling out of the timber
- Movement in the hanging post
- Rot around the bottom of the gate
- Split rails or framing
- A brace that is loose or incorrectly positioned
- The gate catching the ground
- A latch that no longer lines up
Do not assume the gate itself is the only problem. A damaged post or foundation may be the main cause.
Making the Gate Safe
Support the gate before removing hinges, bolts or damaged timber.
Use:
- Timber blocks
- Wedges
- Temporary braces
- A suitable prop
- A second person for larger gates
Before beginning:
- Keep children and pets away
- Avoid working in strong winds
- Wear gloves and eye protection
- Remove loose fittings
- Clear the area around the gate
- Arrange help for heavy gates
- Make sure the gate cannot fall unexpectedly
Do not leave a heavy gate hanging from one loose hinge while repairs are carried out.
If the gate or post is unstable, remove the gate completely before continuing.
Checking the Gate Posts
The hanging post carries most of the gate’s weight.
Check it for:
- Movement at ground level
- Rot
- Splits
- Cracks
- Loose concrete or post mix
- Leaning
- Previous repairs
- Insufficient size
- Movement when the gate opens
Also inspect the latch post.
A gate may appear to sag when the real problem is that one or both posts have moved.
Use a spirit level to check whether the posts are vertical.
If the hanging post moves under load, tightening the hinges alone will not solve the problem.
Possible solutions include:
- Resetting the post
- Reinforcing the post
- Fitting a repair spur or support
- Replacing the post
- Upgrading to a larger post
A heavy or wide gate should not be hung from a standard lightweight fence post.
Tightening or Replacing Hinges
Loose hinges are one of the most common causes of gate movement.
Check:
- Screws and bolts
- Hinge pins
- Bands
- Hooks
- Welds
- Fixing holes
- Timber around the fixings
- Movement between the hinge and post
Tightening existing hinges
Tighten loose fixings carefully.
If a screw no longer grips:
- Move to a larger suitable exterior fixing
- Use a bolt where appropriate
- Repair the timber before refixing
- Move the hinge slightly into sound timber where practical
Do not simply fit a longer screw into badly rotten or split timber.
Replacing hinges
Replace hinges where they are:
- Bent
- Cracked
- Excessively worn
- Rusted through
- Too small for the gate
- Pulling away repeatedly
Choose replacements that suit the gate width, weight and construction.
Longer hinge bands normally spread the load more effectively across the gate frame.
Correcting a Sagging Timber Gate
A timber gate usually sags at the latch side.
This may be caused by:
- Loose hinges
- Weak framing
- Incorrect bracing
- A moving post
- Timber distortion
- A gate that is too wide or heavy
Before adjusting the gate, check that the hanging post is secure.
Check the diagonal brace
On a traditional ledged-and-braced gate, the brace should normally rise from the lower hinge side towards the upper latch side.
This helps transfer the gate’s weight back towards the lower hinge.
If the brace is loose, damaged or fitted in the wrong direction, the gate may continue to sag.
Possible repairs
Depending on the condition of the gate, you may be able to:
- Tighten or replace the hinges
- Add stronger hinge fixings
- Refix or replace the brace
- Square the gate frame
- Fit adjustable hinges
- Add a suitable anti-sag support
- Replace damaged rails
- Rehang the gate at the correct level
Support the gate in the correct position before tightening or replacing the fittings.
A badly distorted or rotten gate may not remain square after repair.
Repairing Damaged Timber
Inspect the gate carefully for rot, splits and impact damage.
Pay particular attention to:
- Bottom rails
- Lower corners
- Hinge fixing points
- Latch areas
- Brace ends
- Cut ends
- Areas where water collects
Small areas of damage may sometimes be repaired by replacing individual components.
Possible repairs include:
- Replacing a loose board
- Replacing a damaged rail
- Adding a new brace
- Refitting loose framing
- Reinforcing a sound section with suitable fixings
- Retreating exposed timber
Do not rely on filler alone for structural repairs.
Replace the gate where:
- The main frame is badly rotten
- Several joints have failed
- The hinge side is split
- The brace cannot be secured
- Large sections are distorted
- Repairs would depend on weak surrounding timber
Treat all fresh cuts and exposed timber with a suitable exterior preservative.
Adjusting the Latch and Bolts
A latch that no longer lines up may be caused by:
- Gate sag
- Post movement
- Loose latch fixings
- Seasonal timber movement
- A damaged receiver
- Incorrect original positioning
Correct the gate alignment before moving the latch unnecessarily.
Once the gate is hanging properly:
- Close it gently
- Mark the correct latch position
- Reposition the receiver if required
- Tighten all fixings
- Check operation from both sides
- Confirm any locking mechanism works
For bolts, check:
- The bolt slides freely
- The receiver is aligned
- Ground sockets are clear
- The bolt is not carrying the gate’s weight
- The gate remains secure when closed
On paired gates, check the centre meeting point and both drop-bolt positions.
Repairing Five-Bar and Driveway Gates
Five-bar and driveway gates are wide and can place significant load on the hinges and posts.
Common problems include:
- The latch end dropping
- Loose adjustable hinges
- Bent hinge bands
- Moving posts
- Damaged drop bolts
- Worn centre catches
- Gates meeting unevenly
- Ground sockets moving or filling with debris
Before adjusting the hinges, check:
- Both hanging posts
- Hinge pins and threaded adjusters
- Gate frame
- Centre stop
- Drop bolts
- Ground level
- Opening clearance
Adjustable hinges
Use the threaded adjustment to raise, lower or move the gate sideways.
Make small changes and check the alignment after each adjustment.
Do not set the hinge at the extreme end of its adjustment range unless absolutely necessary.
For paired gates:
- Align both gate leaves
- Check the centre gap
- Confirm the top lines match
- Fit the centre stop correctly
- Make sure one leaf can be secured independently
- Check both drop bolts locate properly
Large gates are heavy. Arrange assistance before removing or rehanging them.
Replacing a Gate Post
Replace the gate post where it is:
- Badly rotten
- Split
- Cracked
- Undersized
- Leaning
- Loose in the foundation
- Repaired repeatedly
- Unable to carry the gate safely
Typical sequence
- Support or remove the gate.
- Remove the hinges and fittings.
- Remove any adjoining fence components.
- Dig around the damaged post.
- Remove the post and old foundation.
- Prepare a new hole.
- Install a correctly sized gate post.
- Align and brace it.
- Add suitable post mix or concrete.
- Allow the foundation to cure.
- Rehang the gate.
- Adjust the hinges and latch.
The replacement post should suit:
- Gate width
- Gate weight
- Gate height
- Wind exposure
- Ground conditions
- Hinge type
Do not replace a failed post with another undersized post.
When to Replace the Gate
Repair may not be worthwhile where:
- The frame is extensively rotten
- The gate is badly twisted
- Multiple rails have failed
- The hinge side is split
- The bracing cannot be secured
- The gate is too heavy for the opening
- The design is unsuitable for the location
- Previous repairs have failed
- The gate is no longer safe
- Repair costs approach the cost of replacement
Replacement may also be the better choice where a different gate style would improve:
- Privacy
- Security
- Access
- Ease of use
- Matching with the fence
- Long-term maintenance
Measure the opening again before ordering a replacement.
Do not assume the original gate size was correct.
Common Repair Mistakes
Avoid these common problems:
- Adjusting the latch before fixing the sag
- Tightening hinges onto rotten timber
- Ignoring movement in the hanging post
- Using hinges that are too small
- Fitting the brace in the wrong direction
- Trying to square a badly rotten frame
- Using indoor screws outdoors
- Overtightening and splitting the timber
- Failing to support the gate during repairs
- Setting adjustable hinges at the end of their range
- Using the latch to hold up the gate
- Ignoring ground slope
- Reusing bent or worn fittings
- Failing to retreat cut timber
- Replacing the post with one that is too small
- Attempting to lift a heavy driveway gate alone
Final Checks
After completing the repair, check:
- The hanging post is secure
- The latch post is secure
- The gate is level
- Side gaps are even
- Bottom clearance is suitable
- Hinges are tight
- Hinge pins are secure
- The gate opens freely
- The gate closes without force
- The latch aligns correctly
- Bolts operate smoothly
- No fixings protrude
- Repairs are fixed into sound timber
- Cut timber has been treated
- The gate does not move excessively in the wind
- Paired gates meet evenly
- Drop bolts locate correctly
Open and close the gate several times.
Inspect the repair again after a short period of use and after strong winds.
Need Help Repairing Your Gate?
Bring photographs, measurements and details of the problem into our Harlow store. Our team can help you choose suitable hinges, repair brackets, gate posts, latches, bolts and fixings.
Before You Start
- Support the gate safely
- Check both posts
- Inspect the hinges and fixings
- Look for rot or split timber
- Check the diagonal brace
- Measure the side gaps
- Arrange help for heavy gates
Need Help with Your Measurements?
Bring your measurements, photographs and a simple sketch into our Harlow store. Our team can help calculate the panels, posts, gravel boards and fixings required.