A gate that will not latch is usually a gate that sags. The hinge side drops, so the latch no longer meets the catch. Tighten the hinge screws, check that the post has not moved, then reposition the catch or add a diagonal cable and turnbuckle. A rotten post, a cracked frame or a powered gate that drags needs a technician.
Why a gate sags and stops latching
Most sagging starts at the hinges. A handyman guide explains that the top hinge pulls away from the post as screws loosen from daily use and weather, or when the screws are too short, and that over time the frame can shift into a parallelogram. Once the gate drops, its latch arm no longer lines up with the catch plate.
The post is the other usual cause. The Money Pit notes that the gate's weight and constant motion loosen the gatepost over time, and that a gatepost needs concrete to carry a gate. Freeze-thaw cycles can move wooden posts too, according to the Handyman Connection guide, and rust or swollen wood can add to the problem.
Fix it in this order
Look before you tighten
Open and close the gate slowly. Watch whether the post leans, the hinges pull out, the frame has gone out of square or only the latch is off.
Tighten every hinge and latch screw
Loose hardware is the simplest cause, and tightening may be enough.
Replace short or stripped screws
Handyman Connection suggests 2 to 3 inch exterior-grade screws when the old ones are too short to hold.
Reset the height
Prop the gate at the right height so the latch lines up, then tighten the hinges. Mark the hinge positions on the post first so you can compare.
Move the catch plate
Loosen its screws, slide it up, down or sideways to meet the latch arm, and tighten it again.
Clean and lubricate the latch
Use a silicone-based lubricant on moving parts. Replace a rusted or broken latch with a rust-resistant one.
Square a racked frame
Run a cable with a turnbuckle diagonally from the top corner on the hinge side to the bottom corner on the latch side. Tighten the turnbuckle a little at a time until the gate is square.
Test and repeat
Swing the gate several times and check the latch after each change.
Make a small adjustment, then test the latch. Moving the catch, the hinges and the cable at once makes it hard to tell what worked.
What to avoid
- Do not bend or force a latch to catch a sagging gate. Fix the sag instead.
- Do not over-tighten the turnbuckle. Small increments are the advice from the guides, and a gate pulled too far binds.
- Do not keep patching a rotten post. Replace it and set it in concrete.
- Do not remove the self-closing hardware from a pool gate.
Pool gates are a safety device
If your gate is part of a pool enclosure, California's pool safety law (Health and Safety Code section 115922) treats a self-closing, self-latching gate as part of the pool barrier. Your city building department sets the rules for your pool, so check with it before you change the hardware.
If the gate has an opener
A sagging gate that drags makes a motor work harder and can trip the obstruction alarm. A Viking operator manual says the gate must be installed properly and work freely in both directions, and that you should not over-tighten the operator clutch or pressure relief valve to make up for a damaged gate. A Mighty Mule manual lists the gate being level and plumb as one thing to check when its board sounds a continuous alarm.
So fix the sag first, then test the opener. If the gate still stops, see swing gate opener not working or sliding gate off track.
When to call a technician
- The post is rotten, leaning or loose in the ground
- The frame is cracked or the gate has sagged and slammed for years
- The gate is heavy iron or has an opener that drags or stalls
- The hinges are bent, rusted or broken
Emil Garage Doors repairs and rehangs gates in Southern California, for example in Buena Park, Poway and Simi Valley. Call (213) 340-4232 or send the estimate form with a photo of the hinge side. See gate repair; we confirm the price after we see the gate.
Questions people ask
How do I fix a sagging gate?
Check the post and hinges first. Tighten or replace the hinge screws, reset the gate height, then add a diagonal cable and turnbuckle if the frame is out of square. A rotten or loose post must be replaced.
My gate won't latch. What can I do to fix it?
See whether the gate has dropped. If it has, fix the hinges or post. If the gate hangs right, loosen the catch plate screws, slide the plate to meet the latch and tighten it. Lubricate the latch.
Where does the cable of an anti-sag kit go?
It runs diagonally from the top corner on the hinge side to the bottom corner on the latch side, and the turnbuckle is tightened gradually.
Can I fix a sagging gate with an automatic opener myself?
You can do the basic hinge and latch checks. Do not turn up the operator's clutch or force to push a dragging gate. Have a technician look at the gate and the operator.
Read next
Sources
- Handyman Connection: gate hinge and latch repairs (causes of sag and latch misalignment, fixes)
- Hunker: how to install a cable and turnbuckle on a wooden gate
- The Money Pit: how to fix a sagging fence gate (gatepost, concrete, anti-sag kit)
- Viking H-10 gate operator manual: safety instructions, installation notes and LED references (hosted by a dealer)
- Mighty Mule MM600ET-PRO manual: audible feedback and troubleshooting guide
- California Health and Safety Code section 115922 (pool safety features, including self-closing and self-latching gates)