Measure the boundary first, the fence second
Most fence measuring guides start with a tape and a post count. The step before that matters more: knowing where your property actually begins and ends. A fence built a few inches over the line can lead to a neighbor’s complaint, a removal order or a costly rebuild. So this article is about the property side of measuring. Counting posts, panels and openings once the line is settled comes afterward, using the corner and post measuring method.
Step 1: Gather the documents you already have
Start with paper before you go outside:
- Your deed and plat map. These describe the lot and its dimensions. They are usually available from your county or local land records office, and sometimes from your closing documents.
- A property survey. If you received a survey when you bought the home, it is the best single document. It shows boundaries, corners, easements and often structures. Learn how to read it in the guidance on reading a property survey.
- Local rules. Zoning and fence rules may require the fence to sit a set distance back from the line or street. Check setback and height limits for your area.
- HOA documents, if any, which may add their own placement rules.
Do not rely on a verbal “the fence is about here” or on an old fence, hedge or driveway edge. Those often drift from the real line over the years.
Step 2: Find the physical markers
Surveyors typically place markers at lot corners: metal rods, pipes, caps or concrete monuments, often buried a little below the surface. A metal detector can help locate them, and a survey drawing shows where to look. Be careful: markers are easy to knock out of position or cover with soil, and moving one can cause legal problems. If you cannot find a marker, or the ones you find do not match the survey, do not guess.
Step 3: Decide whether you need a new survey
A fresh survey by a licensed surveyor is worth considering when:
- the existing survey is missing, old or unclear
- the corners cannot be found
- you are building close to the line
- there is already a dispute or doubt about the boundary
- the lot is irregular or the land is sloped or wooded
It costs money, but it is usually small compared with the cost of moving a fence. Prices vary by place and by lot, so ask for quotes if you need one. Also see the coverage of neighbor fence disputes and shared boundary fences if a neighbor is involved. When the fence will sit exactly on the line, talk with the neighbor first, in writing if you can.
Step 4: Note easements and restrictions
Even if the lot lines are certain, you may not be allowed to build on all of the land inside them. Easements allow utility companies or others to access strips of land, and fences or gates may be restricted there. Check the plat or survey, and read about easements before you finalize the line. Also account for drainage paths, septic fields, wells and underground utilities, which may call for utility locating before you dig.
Step 5: Measure from the markers
With corners confirmed, measure along each side with a long tape, a measuring wheel or a laser distance tool. Practical tips:
- Measure twice and write the numbers down, labeled by side.
- On sloped ground, measure along the horizontal, or note slope separately, because a tape laid along the surface reads longer than the horizontal distance.
- Check the dimensions against the survey. A mismatch of more than a small amount is a sign to find out why.
- Measure setback distances from the markers, not from the house, unless the rules specifically say otherwise.
Step 6: Decide where the fence sits relative to the line
The fence does not have to be exactly on the boundary. Many people place it slightly inside, to leave room for footings, posts and maintenance without crossing the line. Building on the line may make it a shared boundary fence in some places, with legal and cost implications. Building inside leaves a strip of land between the fence and the line that you must still maintain. Whichever you choose, record the decision and keep documents.
Step 7: Stake and string the whole line
Before ordering anything, mark the full line:
- Drive stakes at each corner, offset to the intended fence position.
- Run string tight between them at about the planned fence height, using a line level or a laser to check.
- Mark gate openings with extra stakes or paint.
- Mark post positions along the string if you can.
- Walk the whole line. Look for trees, roots, slopes, utility covers, hose bibs, air conditioners and other things in the path, and think about whether the line can be moved to avoid them. Obstacles are explored under installation obstacles.
Walking the string line often reveals things a plan cannot: a gate that would hit a step, a view you hadn’t considered or a branch that blocks the run.
Step 8: Check again before you order
Review rules, permit needs and HOA approval. Walk the line with your brief or sketch and ask whether the fence will do the job you designed it for. Only then convert the numbers to a materials list. If anything is uncertain, such as the boundary, ask a surveyor or local authority before spending money.
Keep records
Photograph the stakes and string, and keep your measurements, survey and any permits together. If a question about the fence ever arises, you will have a record of what you did and why.