How to fix a sagging metal gate
A gate that drags at the latch end has one of three problems: a leaning post, worn hinges or a frame that has gone out of square. Find which one before you buy anything, because the fix for one does nothing for the others.
Find the cause in ten minutes
You need a level, a tape measure and a helper to lift the latch end.
- Check the hinge post. Hold a level against the side of the post the gate hangs from. If the top leans toward the latch, the post has moved in the ground and the gate is only following it.
- Check the hinges. Lift the latch end while someone watches the hinges. If the pin has play, a hinge has pulled away from the post, or the bolts are loose, the hinges are your problem.
- Check the frame. Measure the gate corner to corner both ways. On a square frame the two diagonals match. If one is longer, the frame has racked and the leaf itself has dropped.
It can be more than one. A post that leans a little often wears the hinges faster, so fix from the ground up: post first, then hinges, then frame.
Fixes, from easy to hard
Most sagging gates need only the first two. The last two are real work.
What each repair costs
IllustrationTighten or replace the hinges
Tighten every bolt first. If a pin is worn or a hinge has cracked, replace it with a heavier one rated for the gate's weight. On a steel post, welded hinges hold better than bolted ones.
Square the frame with a brace
A diagonal brace running from the bottom hinge corner up to the top latch corner pushes the latch end back up and holds it there. Lift the gate square before fixing the brace.
Add a hinge or a wheel
A long, heavy leaf can outgrow its hinges. A third hinge spreads the load, and a gate wheel at the latch end carries it, as long as the ground under it is level and firm.
Reset or replace the post
A leaning post has to come out and go back in plumb, in a deeper, wider concrete footing. The USDA soil survey maps most of Lancaster as loamy sand and sandy loam, which gives a small footing little grip.
Before you dig a post
Resetting a post is digging, and California has a rule for that.
Under Government Code 4216.2, anyone planning to dig, homeowners included, must notify the regional notification center at least two working days before starting, not counting the day of the call. The law counts augering a post hole as excavation. In Los Angeles County that center is DigAlert, reached by calling 811, and it has the utilities mark their lines before you dig.
A buried gas, power or water line can sit anywhere in a yard, so the call matters even for a single post.
When to call a contractor
Hinges and a brace are a weekend job. Some sags go well past that.
- It's a wide driveway gate. Lifting one that heavy and holding it square takes two people and the right equipment.
- Hinges need welding, or a weld on the frame has cracked.
- The post needs resetting in concrete, especially next to a masonry pier or a wall.
- There's an opener on it. A sagging leaf strains the operator, which should be re-set once the gate is fixed.
Wind makes every sag worse here. NOAA's Fox Field records show 51 days with gusts of 40 mph or more in 2024, and an unlatched gate slamming in those gusts loads its hinges every time. If the gate is past saving, price a new gate installation in Lancaster instead.
Rather have it fixed for you?
Tell us what the gate is doing. A licensed contractor follows up with a free written repair quote, with no commitment.