How to Build a Garden Fence | DIY That Actually Works

For the full breakdown, see our best Fence For Keeping Rabbits Out Of Garden guide.

Whether you’re keeping deer out of your tomatoes or just marking off a flower bed, a garden fence is a weekend project once you understand the order of operations. The mistake most first-timers make is skipping the planning phase and digging holes before they’ve squared the corners. That one shortcut causes every other step to go wrong, and it’s a pain to fix after the concrete is set. Here’s the sequence that works: lay out the perimeter, set the posts, then attach the fence material. This guide walks through each step with the exact measurements you need.

Planning the Perimeter and Squaring Corners

Before you dig a single hole, mark the fence line. Use stakes and string to outline the area, and leave a gap where the gate will go. This layout step is what separates a straight fence from one that wanders.

Square corners are non-negotiable for a professional-looking result. Use the 3-4-5 method: measure 3 feet along one string, 4 feet along the adjacent string, and adjust until the diagonal between those two points measures exactly 5 feet. That triangle guarantees a 90-degree corner. Popular Mechanics and This Old House both emphasize this step, and skipping it is the most common DIY mistake.

Confirm property boundaries and check local zoning before you commit to a layout. Home Depot’s fence guide notes that setbacks, HOA rules, and permit triggers vary by location in the US. A fence on the wrong side of a property line can end up costing more to move than it did to build.

Setting Posts Deep Enough to Last

Post placement and depth are what make a fence survive wind, frost heave, and the weight of the material you hang on it. Most guides put posts 6 to 8 feet apart, with gate posts set closer together and framed more heavily.

Dig holes with a post-hole digger or auger, about 8 inches in diameter for a standard 4×4 post. The rule on depth: bury at least one-third of the post’s length, and extend below the frost line where winters get cold. This Old House’s critter-proof fence guide uses 8-foot posts buried 3 feet deep, and 10-foot posts buried 4 feet. A 4-foot-high picket fence typically starts with 6-foot posts sunk 2 feet into the ground.

Add a few inches of gravel at the bottom of each hole for drainage, then set the post and check it with a level — plumb on two adjacent sides before you pour anything. Fill with concrete and let it cure for at least 24 hours, or overnight, before attaching any weight. That waiting period is where impatient builders create sagging fences.

Attaching the Fence Material

Once the concrete has cured, you can attach whatever material fits your goal. The choice matters as much as the building method: wire mesh keeps animals out, pickets define a boundary, and decorative metal panels add ornament without blocking the view.

Wire mesh is the standard for critter exclusion. Staple it to the posts or to horizontal rails, keeping it taut from end to end. If the goal is specifically rabbit control rather than general garden defense, our roundup of the best fence for keeping rabbits out of the garden covers the product options that actually work.

Wood pickets and panels go on with deck screws or nails, driven through the face of the board into the rails. Space pickets evenly, and use a string line to keep the tops level across the whole run. Decorative metal garden panels, like the 23.5″ x 23″ or 21in x 10ft sections available at home centers, link section to section with their built-in connectors — no post digging required for short borders.

Gates are the last piece, and they need sturdier posts than the field posts. Use larger-diameter or deeper-set posts on both sides of the opening, and add diagonal bracing to keep the gate from sagging over time.

Common Mistakes Worth Avoiding

Every fencing guide repeats the same handful of errors because they’re all avoidable with patience. The big ones: digging before squaring the corners, setting posts without checking plumb, burying posts too shallow for the frost line, and attaching panels before the concrete has cured.

Spacing also matters. Posts too far apart for the chosen material will sag under the weight of wet wood or snow. Posts too close together waste materials and make the fence feel cramped. Stick with 6 to 8 feet for standard wood and wire builds, and adjust only for shorter decorative sections.