Landscaping services
Fence installation: the survey line, the exemption and the frost line
Where a fence may go, how tall it may be, how deep the posts should be set, and what to get in writing before the first hole.
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Written by HyreYard Research Desk Primary-source research and fact checking
The short answer
Three things decide a fence, and you can see only one. Height: the model code exempts fences up to 7 feet from a building permit, except pool barriers.
The property line: a survey sets it, and the fence marks it for years. Post depth: your county’s frost line, which is set locally, not in the model code, decides it.
What should you know before you build a fence?
The model exemption reads: “Fences, other than swimming pool barriers, not over 7 feet (2134 mm) high.” A pool barrier has its own life-safety rules.
No building permit does not mean the fence meets zoning, an easement or an HOA covenant.
Your building department publishes it for your county, and it sets how deep posts go in cold climates.
A fence on the wrong side of a boundary gets moved, which costs more than a survey.
Find a landscaping company for a fence
Free, with no obligation: a person at HyreYard replies by email. Matching is not live yet, so this is not a quote. If a tree or limb is on a power line, stay away and call the utility.
What does a failing fence look like?
A leaning or sagging fence points first to the posts. The pattern tells you whether it is depth, soil, water or wood.
The fence acts as a sail and the posts rotate in the ground: too shallow for the height, or soil too soft.
A local problem: a shallow hole, a hole dug in fill, or water collecting at that spot.
Frost heave. The post bottom sits above the frost line and freezing soil pushes it up.
Wood decays where moisture and air meet, so posts fail at ground level, not at the bottom.
Concrete poured so it holds water against the post. The collar survives and the post does not.
An undersized or moving gate post, or a gate with no diagonal brace.
Which fence rules apply to yours?
Fence types get discussed as if the material were the only difference. The rules are not the same, and one set is life-safety law.
| Fence type | Which rules apply |
|---|---|
| Boundary or privacy fence | The case the 7-foot model exemption describes. Zoning governs it as much as the building code: front and rear yard heights can differ, and corner lots can have sightline rules. |
| Swimming pool barrier | Named as excluded from the exemption. Barriers have their own rules for height, gaps, climbability and self-closing, self-latching gates. Check yours against the local barrier rules. |
| Fence on a retaining wall | Two structures, two rulebooks. The wall has its own permit measurement and the fence adds load to it; see retaining walls. |
| Deer fence, screen or trellis | Light and low-risk, and still covered by height and setback rules in many places even without a building permit. |
What should a contractor check before quoting a fence?
A fence priced from a length and a style sheet has skipped the two questions that decide whether it stands and whether it stays.
And what evidence sets it. A hedge, an old fence and “it has always been there” are not evidence.
On the line, inside it or straddling it, and what was agreed with the neighbor.
Published by your building department for your county. It sets the minimum post depth.
The free USDA Web Soil Survey shows soft, wet or swelling ground, which changes how posts are set.
Front, side and rear can differ, and corner lots can have a sightline triangle.
A fence across a utility or drainage easement can be removed for access, and putting it back can fall to you.
On height, material, color and which side faces out. See HOA landscaping rules by state.
Whether panels step down the grade or rack to follow it, which changes the look and the panel count.
How is a fence built?
The fence is decided in the first three steps. Once the posts are in, the rest is carpentry.
From a survey, found corner pins, or a new survey where neither is reliable. This is the only step whose failure means moving the whole fence.
Permit, zoning height by yard, setbacks, corner sightlines, easements and covenants. The building department and the zoning office answer different halves.
Tied to the local frost line in cold climates. A post set above it gets pushed up by freezing soil, and concrete at the top does not stop that.
Utility lines are marked, then the line is strung and every post marked so the run ends on a full panel, not a sliver.
To the design depth and diameter, straight-sided and cleaned out. The model minimum for exterior footings is 12 inches below undisturbed ground, with frost rules on top where they apply.
Plumb, on line and to depth, by a named method: concrete, compacted gravel or a maker’s system. “Footings shall not bear on frozen soil unless the frozen condition is permanent.”
The visible part, stepped or racked down any slope. Gate posts are sized for the gate, and each gate is braced.
Stain or treatment where the material needs it, hole spoil hauled away, and the line checked for straightness and height.
What do the model code figures say?
Model text, read as Texas Windstorm Insurance Association Building Code, 2024, section 105.2 for the exemption and as reproduced in the Indiana Administrative Code, 675 IAC 14-4.4-43 for frost. Neither is your law; your jurisdiction’s adopted version binds.
| Provision | What it means |
|---|---|
| The fence exemption | “Fences, other than swimming pool barriers, not over 7 feet (2134 mm) high.” |
| Height: 7 feet | The building-permit threshold only. Zoning height limits are separate and can be lower, especially in front yards. |
| What exempt does not mean | “Exemptions from permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction.” |
| Minimum depth: 12 inches | IRC R403.1.4, minimum depth: exterior footings at least 12 inches below undisturbed ground, plus frost provisions where they apply. Recorded as consistently published, not quoted verbatim. |
| Frost protection | IRC R403.1.4.1, frost protection: supports must be protected from frost, for example by extending below the frost line in the local Table R301.2(1). |
| Where the frost line comes from | It is not in the model code. The adopting jurisdiction sets it, from nothing in the warm south to several feet in the north. Ask your building department for your county’s figure. |
What belongs in the written scope for a fence?
The part of a fence you cannot inspect is underground. Once posts are set, nobody sees their depth, hole size or setting method again, and those three decide whether the fence stands in ten years.
In inches, and the local frost line it is based on. If no frost figure is named, ask which one was used.
And how the bottom is cleaned out.
Concrete, compacted gravel or a maker’s system, and how water is kept away from the post.
Material, size and spacing, with gate posts sized separately from line posts.
Survey, corner pins or new survey, and who is responsible if it turns out wrong.
On the line, inside it or straddling it, stated rather than assumed.
Measured from where, and whether it steps or racks down a slope.
Whether a permit is needed, who pulls it, and whether the height meets zoning.
Covenants and some ordinances specify it.
Bracing, hinges, latch, and how each is hung.
Who removes them, and whether that is in the price.
And the date, so digging waits for the marks.
A quote that names a style, a length and a price has priced the visible half. The same buried-work argument for patios and walls is on the hardscape base specification.
Call 811 before anyone digs
A fence line is dozens of holes along a boundary, where utility lines can run.
811 is the free national before-you-dig service. Request marks, and the utilities flag or paint their lines.
If there is a pool, have the barrier checked against the local barrier rules, not priced as a length of fence.
What moves the price of a fence?
Fences are priced per linear foot, which hides three things: how deep the posts go, how hard the ground is to dig, and how many corners, gates and slopes there are.
| Factor | Why it changes the number |
|---|---|
| Length | The headline figure. Measure the run yourself, then count posts and panels with the fence cost calculator. |
| Height | More material, and past a point larger, deeper posts, because a taller fence catches more wind. |
| Post depth | A deep northern frost line means deeper holes and more concrete or gravel per post than a southern one. |
| Ground | Rock, roots, clay and buried debris turn a quick augered hole into a slow hand-dug one, many times over. |
| Material | The line you can shop, and the one with the least to do with whether the fence stays upright. |
| Corners and gates | Corner and end posts are braced differently, and each gate is its own small structure. |
| Slope | Stepping or racking a fence down a slope takes more cutting and fitting than a flat run. |
| Removal and survey | Pulling old concrete-set posts and hauling them away, and a survey where the line is uncertain. |
HyreYard publishes no national average price for this work. Regional labor, material and disposal rates, access and soil move it far enough that a single figure would mislead.
Survey before you build, not after the neighbor objects.
A fence is a lasting, visible claim about where a boundary is. Built to a hedge, a tree line or the old fence, that claim is an assumption.
A survey is paid for once. Rebuilding on the correct side costs the fence, the removal and the relationship, and it can surface years later when the house sells.
What to ask before you sign
Survey, corner pins, or something else?
On the line, inside it or straddling it, in writing.
And how deep are the posts as a result?
And how does water get away from the post?
And how is each gate braced?
And does the height meet zoning in this yard?
What happens if a utility needs access?
Old fence removal and hauling the spoil?
What to have ready before you call
Look for the boundary and any easements.
Walk the line looking for them. If none turn up, price a survey as part of the job.
Before the quote, not after the posts are in.
Ask the building department whether a permit is needed and what the frost depth is; ask zoning the height limit in that yard.
Count the corners, gates and slope changes; they move a per-foot price.
Height, material, color and which side faces out.
Where do fences go wrong?
It may have been in the wrong place for decades. Replacing it in the same spot repeats the error.
Freezing soil lifts them, and the lift adds up season by season.
A 7-foot fence can need no building permit and still break a front-yard zoning limit, a covenant or a sightline rule.
Barriers have their own gap, climbability and gate rules. A privacy fence can pass the height rule and fail all of them.
A collar that collects water keeps the wood wet at the soil line. The post rots while the concrete looks perfect.
A gate is a lever. On a post sized for a panel it drops, and hinge adjustment will not fix a moving post.
Your inquiry
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Free, with no obligation: a person at HyreYard reads your request and replies by email. Matching is not live yet, so this is not a quote, and nothing goes to a landscaping company unless you agree. If a tree or limb is on a power line, stay away and call the utility.
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Questions
Do I need a permit to build a fence?
How deep should fence posts go?
Whose fence is it, and who pays?
Does the good side have to face the neighbor?
Why is my fence leaning?
Should posts be set in concrete?
Is a fence around my pool the same as a privacy fence?
Do I need a survey?
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HyreYard Research Desk
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