Fence Gate Installation: Hinges, Latches, and Sizing

A gate that sags or won't latch is frustrating. Proper sizing, hinges, and latches make the difference. Here's how to install a gate that works.

Gate Sizing Basics

Measure the opening between the two gate posts. The gate width should be 1–2 inches less than the opening to allow clearance for hinges and latch, and to prevent binding. For a 36-inch opening, build a gate 34–35 inches wide. For driveways or equipment, 12–16 feet is common; use double gates or a larger single gate.

Gate posts must be sturdy—they carry the gate's weight and the stress of opening and closing. Use 6x6 posts or double 4x4s for wide gates. Set them in concrete and ensure they're below the frost line. See concrete vs gravel for foundation options.

Hinges: Types and Placement

Place the top hinge 2–3 inches from the top of the gate, the bottom hinge 2–3 inches from the bottom. For gates over 4 feet, add a third hinge in the middle. Use galvanized or stainless hardware to avoid rust.

Latches and Hardware

• Latch. Thumb latch, slide bolt, or padlock hasp—choose based on security needs.
• Strike plate. Receives the latch; mount on the latch post.
• Gate stop. Prevents the gate from swinging past 90 degrees.
• Wheel (optional). For very wide gates to reduce sag and drag.

Building a Wood Gate

Use a frame: 2x4s for the perimeter, with a diagonal brace from the hinge corner to the latch corner (bottom to top) to prevent sag. The brace should point up from the hinge side. Cover with pickets or panels to match your fence. For a wood fence, match the gate style to the rest of the run.

Installing the Gate

1. Ensure gate posts are plumb and properly set.
2. Hold gate in place with 2x4 prop; check clearance at top and bottom.
3. Mark hinge positions on gate and post.
4. Attach hinges to gate first, then hang gate and attach to post.
5. Install latch and strike plate.
6. Add gate stop if needed.

Preventing Sag

Sag is the most common gate problem. Use a diagonal brace in the frame, strong hinges, and sturdy posts. For gates over 4 feet, consider a gate wheel at the latch corner. Adjustable hinges can correct minor sag over time.

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