Plan a gate that won't sag.
The Gate Builder sizes the frame, picks the right hardware, and writes a step-by-step build guide — same rigor as our fence tool, tuned for gates.
- Automatic sag-proof diagonal brace direction
- Single or double leaf sizing with hinge/latch gaps
- Heavy-duty hardware sized for your gate weight
- Cut list, shopping list, and cost estimate
- Permit checklist with corner-visibility rules
Why gates fail
Every sagging gate has the same root cause: a diagonal brace pointing the wrong way, hinges screwed into a picket instead of the frame, or posts that are undersized. The Gate Builder handles all three by default.
Plan it in 5 steps
- 1Measure the finished opening
Measure post face to post face at the top and bottom. Use the smaller number — posts rarely stand perfectly parallel.
- 2Choose leaf count
Past roughly four feet of opening, a double leaf usually swings and holds better than one wide leaf.
- 3Set your gaps
The calculator subtracts a hinge-side and latch-side gap so the leaf swings free instead of binding on the post.
- 4Brace it in the right direction
A wood diagonal runs in compression from the bottom hinge corner up toward the latch side. A cable kit does the opposite. Do not install both.
- 5Match hardware to weight
Use hinges rated above your estimated leaf weight, and confirm the post can carry it before you hang the gate.
Planning guidance only. Every quantity and price is an estimate — confirm dimensions and local requirements before you buy or build.
Frequently asked questions
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