How to Measure for a Fence
Bad measurements = bad estimates = lost money. Whether you're a homeowner getting ready for quotes or a contractor on a site visit, here's how to measure a fence job correctly.
Before You Measure: Find the Property Line
This step saves lawsuits. Seriously.
Option 1: Survey Pins
Most properties have metal survey pins at each corner, driven into the ground and often marked with a small flag or cap. Use a metal detector if they're buried.
Option 2: Property Survey
If you can't find pins, check your deed or plat map. Your county recorder's office has these on file (often online). If all else fails, hire a surveyor ($300-800) — cheaper than moving a fence after a neighbor dispute.
Option 3: County GIS Maps
Many counties offer free online GIS (Geographic Information System) maps that show property boundaries overlaid on aerial photos. Not survey-accurate, but good for planning.
Rule of thumb: Install the fence 2-6 inches inside your property line. This avoids boundary disputes and gives you room to maintain the "neighbor side" without trespassing.
Measuring Tools
| Tool | Best For | Cost |
|---|---|---|
| Measuring wheel | Walking long runs quickly | $25-50 |
| 100ft tape measure | Precise measurement on straight runs | $15-30 |
| 25ft tape measure | Gates, obstacles, detail work | $10-20 |
| Satellite measurement (FenceCalc, Google Earth) | Pre-qualifying leads remotely | $0-79/mo |
| Laser distance measurer | Hard-to-reach areas, working alone | $30-100 |
| Stakes + string line | Marking the fence path before measuring | $5-10 |
Pro contractor setup: Measuring wheel for the main runs + 25ft tape for gates and obstacles + phone for satellite confirmation.
Step-by-Step Measurement
Step 1: Walk the Full Perimeter
Before measuring anything, walk the entire fence line. Note:
- Where the fence starts and ends
- Location of gates (how many, how wide)
- Obstacles (trees, rocks, sheds, AC units, utility boxes)
- Grade changes (slopes, hills, retaining walls)
- Existing fences to remove
- Utility easements (don't fence over these)
Step 2: Mark the Path
Drive stakes at every corner and change of direction. Run string line between them. This is your fence line.
Step 3: Measure Each Run
Measure the straight-line distance between each stake. Record each segment separately:
| Run | From | To | Distance |
|---|---|---|---|
| 1 | Back-left corner | Back-right corner | 85 ft |
| 2 | Back-right corner | Side gate | 42 ft |
| 3 | Side gate (4ft wide) | — | 4 ft |
| 4 | Side gate to house | House corner | 18 ft |
| Total fence | 145 ft | ||
| Total gates | 4 ft |
Step 4: Measure for Gates
For each gate opening, record:
- Width of opening (standard walk gate: 36-48 inches, drive gate: 10-16 feet)
- Height (should match fence height)
- Swing direction (usually outward, code-required for pool gates)
- Hardware needs (self-closing for pool, standard latch, keyed lock, etc.)
Step 5: Note Terrain and Obstacles
For each section, write down:
- Slope grade (flat, gentle, steep)
- Soil type if known (sandy, clay, rocky)
- Trees within 3 feet of fence line (roots affect post holes)
- Utility boxes or meters (maintain required clearance — usually 3-5 feet)
- Sprinkler heads near the fence line
Satellite Measurement (Pre-Site Visit)
For contractors, satellite measurement lets you get a rough estimate before driving to the property:
- Pull up the address in FenceCalc or Google Earth
- Trace the proposed fence line on the aerial image
- Get total linear footage and rough layout
- Use this to pre-qualify the lead and give a ballpark range
Accuracy: Satellite measurement is typically within 5-10% of ground truth. Good enough for a ballpark quote, not accurate enough for final pricing.
Always ground-truth satellite measurements with a site visit before committing to a price. The satellite can't see slopes, obstacles, or soil conditions.
Common Measurement Mistakes
1. Measuring the Neighbor's Fence (Not the Property Line)
The existing fence might be 2 feet inside the property line — or 2 feet over it. Don't assume the old fence is on the right line.
2. Forgetting the Gates
Every gate needs posts on both sides. A 4ft gate opening actually requires 4ft of gate + 2 extra posts. Three gates on a job means 6 extra posts you need to account for.
3. Not Measuring for Corners
Every corner requires an extra post. A rectangular yard with 4 corners needs 4 corner posts in addition to the line posts. An irregular lot might have 6-8 direction changes.
4. Ignoring Slopes
On a slope, the fence line is longer than the horizontal distance (because you're measuring along the grade, not flat). A 10° slope adds about 1.5% to your measurement. A 20° slope adds about 6%. Significant on long runs.
5. Measuring Once
Measure twice. Or three times. A 5-foot error over a 200-foot fence = 12 extra pickets, 1 extra post, and materials you'll have to buy mid-job at retail instead of wholesale.
Turn Measurements Into Estimates in 60 Seconds
Once you have your measurements, FenceCalc converts them into a complete material takeoff — posts, rails, pickets, concrete, hardware, gates — with pricing and a professional PDF proposal. No spreadsheets, no calculator, no guessing.
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