Question 1

How accurate are your fencing calculators?

Accepted Answer

Our calculators use industry-standard formulas and national average pricing. They produce estimates within 10–15% of typical contractor quotes for most regions, but local pricing varies.

Question 2

Do I need to add a waste factor?

Accepted Answer

Yes — most calculators automatically include a 5–10% waste factor for cuts, mistakes, and damaged materials. You can adjust this where applicable.

Question 3

What's the standard fence post spacing?

Accepted Answer

Most residential fences use 6–8 feet between posts. Wood typically uses 8 ft, vinyl panels are usually 6 or 8 ft, and chain link can stretch to 10 ft.

Question 4

How deep should fence posts be set?

Accepted Answer

A general rule is 1/3 of the post's above-ground height plus 6 inches of gravel. In freeze zones, dig below the frost line — often 36–48 inches.

Question 5

How much concrete do I need per post?

Accepted Answer

Typical 4×4 wood posts in a 10" diameter hole 30" deep need about 1.4 cubic feet of concrete per post — roughly two 60 lb bags.

Question 6

Wood vs vinyl: which is cheaper?

Accepted Answer

Wood has a lower upfront cost ($15–$30/ft installed) but requires staining every 2–3 years. Vinyl ($25–$40/ft) costs more upfront but has near-zero maintenance over 25+ years.

Question 7

Do I need a permit to build a fence?

Accepted Answer

Most jurisdictions require permits for fences over 6 ft tall, fences in front yards, or pool fences. Always check with your local building department.

Question 8

How long does a wood fence last?

Accepted Answer

A pressure-treated wood fence lasts 15–20 years with regular staining. Cedar lasts 20–30 years. Untreated pine may only last 5–10 years.

Question 9

Are your calculators free?

Accepted Answer

Yes — every calculator on Smart Fencing Calculator is 100% free with no signup required.

Question 10

Can I use these calculators for commercial projects?

Accepted Answer

Yes, but always verify with a licensed estimator for commercial work due to scale and code complexity.

Question 11

How do I measure a fence line on a sloped yard?

Accepted Answer

Measure the ground distance, not the diagonal along the slope, because posts are always set plumb. Walk the line with a tape held level and a plumb bob, or step the measurement in 10 ft sections. On slopes steeper than about 15 degrees you will step the panels rather than rack them, which adds a triangular gap at the bottom of each section that you can close with a kickboard.

Question 12

How many pickets do I need per foot of fence?

Accepted Answer

With standard 5.5 inch wide pickets butted tight, you need about 2.2 pickets per linear foot. With a 1 inch gap between pickets, roughly 1.85 per foot. Our picket calculator handles any picket width and gap combination, including the waste factor for cuts.

Question 13

Should I set posts in concrete or gravel?

Accepted Answer

Corner, end and gate posts should always be set in concrete because they carry the tension of the run. Line posts can be set in well-compacted gravel in soils that drain, and many installers prefer it for wood because the post stays drier and rots more slowly. In clay or high-water-table soils, concrete with a gravel base is the safer choice.

Question 14

How long should I wait before staining a new fence?

Accepted Answer

For pressure-treated lumber, wait until the wood is dry enough that a few drops of water soak in rather than bead up. That is typically 4 to 12 weeks depending on climate. Kiln-dried cedar can usually be stained within a couple of weeks. Staining wet lumber traps moisture and the finish peels within a season.

Question 15

What is the difference between a picket fence and a privacy fence?

Accepted Answer

A picket fence has deliberate gaps between the boards and is usually 3 to 4 feet tall, meant to define a boundary rather than block sight lines. A privacy fence uses boards butted together or overlapped, typically at 6 to 8 feet, to block views and reduce noise. Privacy fences need heavier posts because they catch far more wind.

Question 16

How much does it cost to install a fence per foot?

Accepted Answer

In 2026 a 6 ft pressure-treated wood privacy fence installs for roughly $22 to $35 per linear foot nationally, cedar $30 to $45, vinyl $30 to $60 and chain link $12 to $25. Costs vary widely by state — see our fence cost by state page for local ranges.

Question 17

Who owns the fence between two properties?

Accepted Answer

It depends on where the fence sits relative to the property line and on your state's fence law. A fence built entirely on your side of the line is yours. A fence on the line is usually a shared boundary fence, and many states require both neighbours to share maintenance costs. Always confirm the line with a survey before building.

Question 18

Can I build a fence right on the property line?

Accepted Answer

Sometimes, but many municipalities require a setback of a few inches to a few feet, and building on the line usually requires your neighbour's agreement. The safest approach is to set the fence just inside your own line so you can maintain both sides without trespassing.

Question 19

How do I keep a gate from sagging?

Accepted Answer

Use an anti-sag cable kit running from the top hinge side down to the bottom latch side, set the hinge post deeper and larger than a line post, and keep the gate opening under 4 feet for a single leaf. Wider openings should be split into a double gate rather than one heavy leaf.

Question 20

How often should a wood fence be re-stained?

Accepted Answer

Every two to three years for semi-transparent stain, three to five years for a solid-body stain, and annually for clear sealers, which is one reason we do not recommend them. South- and west-facing runs weather fastest and often need attention a year before the rest of the fence.

Question 21

Do your calculators save my results?

Accepted Answer

No. Everything runs in your browser and nothing you type is stored or sent anywhere. You can screenshot your results or write them down before leaving the page. Our Android app keeps the same calculators available offline.

Question 22

Why does my quote differ from your estimate?

Accepted Answer

Contractor quotes reflect local labor rates, access, soil conditions, disposal fees and their current schedule. Our estimates use national averages, so treat them as a sanity check rather than a bid. If a quote is more than about 30% above our range, it is worth getting a second opinion.

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