Repair a sagging wooden fence gate
Square a sound gate, add a tension cable and get the latch closing without lifting.
Lawn & garden · 1–2 hr · Medium
Before you start
Support the gate before loosening or adjusting hardware and keep hands out of hinge and ground gaps. Use a helper for its weight. Wear eye protection when drilling and gloves around cable ends. Stop for decay, moving posts, split framing or slipping fasteners; a cable cannot repair these.
Tools and materials
- Compatible anti-sag cable kit with brackets, turnbuckle and clamps
- Stable support blocks and a helper
- Tape measure, level and pencil
- Drill, specified pilot bit and screwdriver
- Small wrench, gloves and eye protection
Check the problem
Check the post and hinges first
Hold the gate steady and check the hinge post for movement, lean and soft wood. Inspect both hinges and their fasteners. A moving or decayed post, failed hinge or stripped fixing must be repaired before adding a cable; extra tension can make that damage worse.
Confirm the frame itself has sagged
With the post and hinges sound, look for a low latch corner and compare corner-to-corner measurements across the rectangular frame. Unequal diagonals suggest racking. A bowed or badly twisted gate, broken joints or rotten rails needs rebuilding rather than this adjustment.
Steps
Support the gate and secure the hinges
Close the gate and support its weight with stable blocks under the bottom rail. Keep fingers clear. Tighten loose hinge fasteners that still grip sound wood; stop for stripped holes, split framing or worn hinges that need a separate repair.
Lift the latch corner back into alignment
With a helper, raise the latch end just enough to restore the intended gaps. Adjust the blocks to hold it there, then compare the frame’s diagonals and check the top rail. Do not force a twisted gate square or raise it against the post.
Mark the cable’s two mounting corners
On the frame side, mark the upper hinge corner and lower latch corner. The cable pulls between these corners; it does not follow the opposite diagonal used by a timber compression brace. Confirm the chosen kit fits the gate’s size and weight.
Fasten the brackets into solid framing
Hold each bracket against sound structural rails or stiles, not thin infill boards. Drill the kit’s specified pilot holes and install its corrosion-resistant fasteners in all required holes. Keep the supported gate square.
Connect and clamp the cable
Open the turnbuckle enough to leave adjustment while retaining the specified thread engagement. Attach it at the upper hinge bracket. Route the cable to the lower latch bracket and secure its loops with the supplied clamps exactly as the kit drawing shows; pull out slack before tightening the clamps.
Tension the cable gradually
Turn the turnbuckle body in small increments to take up slack and support the latch corner. Do not twist the cable or wrench the gate past square. Check both brackets and cable clamps; stop if wood splits, fasteners move or the cable slips.
Test the swing and align the latch
Remove the support blocks and swing the gate through its full travel. Check ground clearance and even gaps, then adjust the latch only if needed. Close it several times without lifting or slamming; recheck cable clamps and fasteners after the first few days.
The gate clears the ground through its full swing and latches without lifting; brackets, clamps and fasteners remain secure.
Tips
Use the correct diagonal
A tension cable goes from upper hinge corner to lower latch corner. A rigid wooden compression brace normally runs the opposite way; do not copy its direction for the cable.
Leave room for later adjustment
Keep adequate thread engagement at both ends of the turnbuckle. If it reaches the end of its useful travel, reset cable length according to the kit instead of unthreading it farther.
Recheck after weather changes
Seasonal movement may change clearances. Inspect hardware and wood before adding tension; repeated sagging can mean the underlying structure needs repair.