How to Fix a Sagging Fence Gate: Simple Carpentry Fixes.

Wood gates naturally sag over time. As the gate is opened and closed, gravity pulls on the latch side, warping the rectangular gate frame into a trapezoid. Here are the three most common ways to fix gate sag.

1. Inspecting and Tightening Hinges

Before adjusting the gate frame, check the hinges. Often, the screws securing the hinges to the post have rusted, loosened, or stripped, causing the gate to lean.

Method: Prop up the latch side of the gate with wood blocks to relieve pressure. Back out the loose screws. If the wood holes are stripped, pack them with wood glue and toothpicks or install longer wood screws (at least 3 inches) that sink deep into the post's structural center.

2. Squaring the Gate Frame with Corner Brackets

If the hinges are tight but the gate is out of square, the wood joints at the corners have loosened.

Method: Secure heavy-duty metal L-plates or corner braces to the four inner corners of the gate frame. Use a level to ensure the gate is square before screwing the plates in place. This reinforces the joints and holds the gate at a perfect 90-degree angle.

3. Installing a Turnbuckle Cable (Anti-Sag Gate Kit)

This is the most reliable, adjustable long-term fix. It uses a steel cable and turnbuckle tensioner to pull the gate's lower outer corner back up towards the upper hinge corner.

Method: Mount one corner bracket at the top corner of the hinge side, and another at the bottom corner of the latch side. Thread the steel cable through the turnbuckle and secure both ends to the brackets. Turn the center turnbuckle barrel to tighten the cable, which lifts the latch side of the gate off the ground.

4. Checking the Gate Post

Sometimes, it is not the gate that is sagging — it is the post. If the hinge post is leaning due to soil erosion, frost heave, or rot at ground level, no amount of gate adjustments will fix it.

Method: Check the post with a level. If the post is leaning, it must be dug out, braced plumb, and reset with new concrete, or replaced entirely if rot has compromised the below-ground wood fiber.