If your wooden fence gate sags, it can be an inconvenience, but you don't usually need to replace it. Gates are the first part of the fence to sag from normal wear and tear plus the weather. A gate commonly doesn't have many parts, so the issue is simple to trace and fix with an anti-sag kit. Correct your sagging gate by following these tips.

Fix the Fence Hardware

To fix the sagging fence, gather:

• work gloves 
• pencil
• wrench, ratchet, and screwdrivers
• galvanized screws or bolts
• hinges (optional)
• bricks or wood blocks
• narrow spade (optional)
• concrete mix 
• packed dirt
• drill
• anti-sag kit

Examine the hardware to ensure it is tight. If the hole has become hollowed, remove the screw or bolt and replace it with a larger, stronger one.Use the screwdriver to tighten the screws, and the wrench or ratchet to tighten the bolts.

Inspect the hinges( flat fasteners) for damage if tightening the hardware didn't work. To replace the hinges, detach the lag bolts on the bottom hinge first, and remove the bottom bolt on the top hinge. Support the bottom of the gate with wood blocks or bricks, then reattach the bolts and hinges after you get the gate level. 

You may have to raise the hinges by drilling new holes slightly over the old hinge position. Use a drill bit slightly smaller than the bolt or screw.

Reset Posts

Wiggle your hinge side post to check for looseness, and reset loose posts. Before you dig, contact your utility service for a map of your home to avoid hitting pipes. Detach the gate, and dig a hole about six inches wide on all sides and ten inches deep around the posts.

Mix concrete according to directions, and fill the post holes to a three-inch depth. Let the concrete dry, and pack it with the dirt.

Adjust the Frame

Fix a loose frame with a fence anti-sag kit from department stores or hardware stores, which includes a turnbuckle, eye bolts, brackets, and a cable. Set the bracket in the position recommended by the manufacturer, and mark the holes. Most brackets are placed at opposite angles on the hinge and latch side.

Drill the bolt holes, and secure the brackets and eye bolts in the holes. Attach the turnbuckle to the middle of the top bracket eye between the bolts with clamps or hooks, Pull or rotate the cable until the sag disappears, and attach a clip. Use a wrench to tighten the turnbuckle to raise the latch side.   

For more help, check with a company like City Wide Fence Co.