How to Fix a Sagging Wood Gate

After a few seasons of wind, rain, and sun, most wood gates begin to droop. The latch stops lining up, the bottom edge scrapes the walkway, and the gate starts to look tired even when the rest of the yard is tidy. A sagging gate is more than an eyesore. A gate that will not close properly leaves children and pets an open path out of the yard, which turns a cosmetic problem into a safety hazard.

The repair is simple and inexpensive. Expect to spend 1 to 2 hours and $15 to $25 in hardware, with intermediate-level skills. The work happens in two stages: tighten or replace the hinges first, then force the gate frame back to square with an anti-sag kit if it still droops. The same diagnostic habit used when leveling sagging cabinets applies here: find out whether the support hardware failed or the frame moved, then fix the actual cause instead of the symptom.

Diagnose the Sag Before You Pick Up a Screwdriver

Wood gates sag for two reasons, and the right fix depends on which one you are dealing with. The first is loose hinge screws. Every swing works the screws against the wood grain, and after thousands of cycles the holes strip and the screws lose their grip. The second is a frame that has gone out of square. The gate’s own weight pulls the unsupported corner down, the diagonal measurement changes, and the gate no longer fits its opening.

Gate frames are not the only part of a house that droops with age. The process for fixing squeaky, gapped, and sagging wood floors follows the same diagnostic pattern: locate the failing support, repair it, then reinforce it so the problem does not return.

The Two-Minute Diagnostic Test

Run through three checks before you buy anything.

• Open the gate fully and look at the hinge side. If the gap between gate and post is wider at the top than at the bottom, the hinges are carrying the blame.
• Close the gate and check the latch side. If the latch gap is even but the bottom corner drags on the ground, the frame has gone out of square.
• Push down on the latch-side corner. If the gate flexes more than about a centimeter, the frame joints have loosened.

Tools and Materials Checklist

Most repairs need nothing more than the following items, most of which you may already own.

• Cordless drill with driver bits
• Exterior-rated screws, 3 inches or longer
• Wood glue and toothpicks or dowels for stripped holes
• Anti-sag kit with steel cable and turnbuckle
• Shims, a level, and a tape measure
• Paint or sealer for touch-up

Tighten or Replace the Gate Hinges

Start with the hinges because loose hardware is the most common cause and the cheapest to fix. Pull the screws one at a time, dip the tip in wood glue, and drive them back in. If the holes are stripped, push glue-coated toothpicks or a small dowel into the hole, let it set, then re-drive the screw into solid wood.

If the gate still hangs low, upgrade to longer screws. A 3-inch exterior screw reaches past the damaged zone into the solid core of the post, and one long screw per hinge often fixes what a dozen short ones cannot. The same principle shows up all over the house: a sagging roof rarely fails all at once, it starts when a single support point lets go, and catching it early prevents a much larger repair.

Swap In Longer Screws

Work through these steps in order:

1. Open the gate and prop the latch side with a shim so the hinge screws are not carrying the full weight.
2. Remove one hinge screw at a time, starting at the top hinge.
3. Drive in a longer exterior-rated screw of the same head type.
4. Repeat for every screw on every hinge, then lower the gate and test the swing.

When to Replace the Hinges

Hinges can bend, rust, or wear out. If the hinge leaves are warped, the pin is loose, or rust has pitted the metal, replacement beats repair. A pair of galvanized or stainless steel hinges costs $10 to $15 and lines up with the screw pattern on most gates. Match the hinge size to the gate: a heavy solid-wood gate needs 4-inch hinges at minimum, while a light picket gate works fine with 3-inch hardware.

Force the Gate Back to Square

If the hinges are solid and the gate still sags, the frame itself has moved. A gate is a rectangle, and a rectangle stays rigid only while its corners stay true. Once the unsupported corner drops, the shape becomes a parallelogram and the diagonal distance grows. The fix is a diagonal brace or an anti-sag kit that pulls the frame back into square.

A sagging door suffers from the same geometry problem: the frame shifts, the hardware misaligns, and the repair means restoring the frame to square rather than adjusting the latch again and again.

Install an Anti-Sag Kit

Anti-sag kits cost $10 to $20 and include a steel cable, a turnbuckle, and mounting brackets. The cable runs from the lower hinge-side corner to the upper latch-side corner, the tension diagonal that resists droop.

1. Mount the cable brackets at the two opposite corners.
2. Run the cable across the diagonal between them.
3. Turn the turnbuckle a quarter turn at a time until the gap closes.
4. Recheck the latch alignment and tighten the lock nut.

Build a Permanent Diagonal Brace

For a longer-lasting result, cut a piece of pressure-treated lumber to fit diagonally from the bottom hinge corner to the top latch corner, notch it into the rails, and fasten it with exterior screws. A wood brace costs $5 to $10 and never needs adjustment the way a cable does, which makes it the better choice for gates that get heavy daily use.

Check the Post and the Ground Below

A gate is only as straight as the post it hangs from. If the post has leaned, no amount of hinge work will level the gate. Hold a level against the post on two faces. A lean of more than about 1 degree across the height of the gate will show up as a visible droop at the latch.

Posts lean when the concrete footing settles, when soil washes out around the base, or when the post was set too shallow for its height. The same evaluation logic that engineers apply to a bouncy or sagging floor applies to a gate post: measure the movement, identify the failing support, and decide whether reinforcement or replacement is the cheaper path.

Signs the Post Has Moved

• The lean is visible from across the yard before you reach the gate.
• A gap has opened between the post and the fence panels on one side.
• The concrete collar is cracked or tilted.
• The gate rubs harder on one side of the opening than on the other.

Stabilize a Leaning Post

For a minor lean, dig out the soil around the base, jack the post back to plumb, and pour a fresh concrete collar around it. For a post whose base has rotted, cut it off below the rot, splice a new section with a steel post anchor, and set the anchor in concrete. Both jobs take 1 to 2 hours plus curing time for the concrete, and they solve the problem at the source instead of at the latch.

Stop the Sag From Coming Back

The repairs above will fix the gate, but the sag will return if the causes stay in place. Moisture is the biggest one. Wood swells when wet and shrinks when dry, and every cycle loosens joints and widens screw holes. A gate left unsealed will pull its own screws out within a season or two.

Reinforcement matters as much as repair. The same way identifying the causes of bouncy or sagging floors leads to reinforcement that prevents a repeat, a gate stays straight when you remove the conditions that made it sag in the first place.

Seasonal Maintenance Routine

1. In spring, retighten every hinge screw after the winter freeze-thaw cycle.
2. In fall, reapply sealer or paint to the end grain and joints.
3. After each storm, check that the latch still lines up.
4. Once a year, re-tension the turnbuckle and recheck the diagonal.

Hardware Upgrades That Help

• Stainless steel hinges and screws resist rust far longer than galvanized hardware.
• A gate wheel or caster on the latch side carries part of the weight and takes strain off the hinges.
• A drop rod that seats into the ground holds the gate steady and stops wind from working the hinges loose.

Budget, Timeline, and When to Hire a Pro

Most sagging gates are a weekend-morning project. The table below shows what each repair level costs and how long it takes.

A new post with concrete runs $40 to $80 in materials, and a professional gate repair typically lands between $150 and $400. Hand the job to a contractor when the post has rot below the soil line, when the footing is cracked and shifting, or when the gate is too heavy for one person to lift safely.

Homeowners facing a bigger structural problem can apply the same evaluation and reinforcement methods used for sagging floors, where the decision always comes down to measured condition, repair cost, and remaining service life. A gate that still sags after a correct hinge and brace repair is telling you something about the ground underneath, so trust the measurement and plan the bigger fix.

When to Call a Contractor

Call in a professional when the post base is rotten below grade, when the footing has failed, or when the gate is a heavy custom piece that a single person cannot safely handle. A quick inspection costs little, while redoing a failed DIY repair costs more than doing the job right the first time.