Installing a backyard fence means checking property lines and codes, marking and squaring a straight line, then setting posts at proper depth with gravel and concrete before attaching anything.
Here’s the build in working order, from utility call to gate latch.
Before You Dig: Property Lines and Local Rules
Skipping paperwork is the project’s most expensive mistake — fences get torn out when they don’t match the rules.
- Pull your plat or survey to confirm the property line — don’t guess from where the grass changes.
- Check city or county setback rules and permits; many jurisdictions cap fence height without one.
- Read HOA covenants, which often restrict height, material, and finish color.
- Call 811 before digging so utilities are marked. It’s free and the law in most states.
Measure the full run, gate openings included. Gate width is the measurement people forget — and the one that decides whether a riding mower reaches the yard.
How Do You Lay Out and Square the Fence Line?
Set the line with stakes and string, not eyeballs. Run string between corner stakes, then use the 3-4-5 triangle method to confirm true 90-degree corners before digging.
Mark post locations along the string. Most styles call for posts every 6 to 8 feet, and that spacing must stay consistent — one short or long gap throws off every prefabricated panel that follows.
Setting Posts: Depth, Gravel, and Concrete
Bury at least one-third of the post’s length — around 2 feet for many backyard posts — and deeper than the local frost line in cold climates.
- Dig each hole with a post-hole digger or auger, wider at the top for adjustment.
- Add 3 to 6 inches of gravel or crushed stone so water never sits against the wood.
- Set the post, check it plumb on two faces, and brace it.
- Pour concrete, slope the top to shed water, stop short of the hole’s top, and backfill the last few inches with soil once set.
- Let the concrete cure fully before hanging anything.
For brands and materials worth comparing, browse our tested back yard fencing breakdown.
Rails, Panels, and Gates
Structural parts go on after the concrete cures, never before — attaching early pulls posts out of plumb.
Wood rail and picket fences get rails fastened to posts, then spaced pickets screwed or nailed in place. Prefabricated panels are lifted in and locked with brackets or screws once posts stand. Wire and mesh fences get tensioned between posts rather than screwed to them. Gates go in last, with hinges on the post side and a latch that closes cleanly — hang a gate too tight and seasonal swelling jams it.
The Home Depot’s fence build guide and This Old House’s critter-proof fence walkthrough stress the same two things: square the layout before digging and set posts deep enough for your climate. The Home Depot’s how-to-build-a-fence guide lays out the same order used above.
What Decides Whether the Fence Lasts
Four things separate a fence that stands straight for a decade from one that racks and leans: post depth below the frost line, gravel drainage at the base, squared corners, and consistent post spacing. Rusting hardware and skipped permits are the two quiet costs people don’t plan for.
| Mistake | What It Causes | The Fix |
|---|---|---|
| No property or code check | Forced removal, fines, disputes | Survey plus permit before digging |
| Posts set too shallow | Heaving and lean after frost | One-third of post length, below frost line |
| No gravel at post base | Rot at ground level | 3–6 inches of drainage stone |
| Unsquared corners | Panels that won’t fit | 3-4-5 method before digging |
| Panels hung early | Posts pulled out of plumb | Wait for full concrete cure |
| Uneven post spacing | Gaps and short panels | Mark every post along the string |
Set the posts, wait for the cure, and the rest is assembly.
FAQs
How deep should backyard fence posts be set?
Bury at least one-third of the post’s length — roughly 2 feet for a standard 6-foot post. In cold regions, dig deeper than the local frost line so the ground can’t heave the post upward. Confirm local depth expectations with the county before digging.
Do I really need concrete around fence posts?
Concrete is common because it locks posts plumb and resists frost movement, but it isn’t mandatory everywhere. Drainage matters more: add gravel below the post either way. Skipping the stone traps water against the wood and shortens the post’s life.
How long before I can hang rails and panels?
Wait until the concrete has fully cured; guides generally suggest a day or more. Setting structural parts on wet concrete pulls posts out of plumb. Also backfill the top of the hole with soil, not concrete to the rim.
References & Sources
- The Home Depot. “How to Build a Fence.” Step order, post spacing, and drainage-layer guidance for backyard fence builds.
- This Old House. “Install a Critter-Proof Garden Fence.” Post depth, gravel base, and mesh fence tensioning notes.
