Fence laws in Aliso Viejo, California
What the Aliso Viejo municipal code says about fences, one topic at a time, with the section number and a link to the document behind every line. Where Aliso Viejo sets no rule of its own, the California rule is shown in its place and marked as such.
Fence laws in Aliso Viejo, California, question by question
The short version
- Who pays on the line
- Two neighbors split the cost of a fence on the line in California.
- How tall
- Aliso Viejo allows six feet in a side or rear yard and forty two inches in a front yard setback, and the answer turns on whether the fence is in a side or rear yard or in the front yard setback. The figure is 6 feet, for fence height in a side or rear yard.
- Permits
- A masonry fence under seventy two inches needs no permit in Aliso Viejo, and a retaining wall escapes one up to forty eight inches from the bottom of the footing, and the answer turns on whether the barrier is a masonry fence or a retaining wall, its height, and whether the wall carries a surcharge or sits on a slope. The figure is 72 inches, for masonry fence height exempt from a permit.
- Pool barriers
- Every exemption in the Aliso Viejo handout stops at a pool.
- Spite fences
- A fence over ten feet tall in California is a private nuisance when it was put up or kept there to annoy the neighbor and the extra height serves no purpose. The figure is 10 feet, for spite fence threshold, with malice required.
- Measured from what
- Two fences standing less than thirty inches apart are one fence in Aliso Viejo, measured from the base of the lower to the top of the higher. The figure is 30 inches, for gap below which two fences count as one structure.
- Corner lots
- California writes no clear view triangle into state law. It reaches the right of way of a state highway, whether or not the whole width is paved only.
- Retaining walls
- Aliso Viejo leaves retaining walls to Title 24 of the California Code of Regulations, the California Building Standards Code, which tracks the International Building Code and the International Residential Code.
- Materials
- California sets a wire standard for a lawful fence in grazing counties. The figure is 3 strands, for barbed wires in a lawful wire fence. It reaches lawful fences in grazing counties only.
- Livestock
- California calls a fence lawful when it is strong enough to keep livestock from getting in or out. The figure is 4 feet, for height of the top wire on a lawful wire fence.
Who owns the fence between two properties in Aliso Viejo?
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California answers this in its own law. The words that do it are quoted below.
Two neighbors split the cost of a fence on the line in California. The law starts from the idea that both get the same benefit from it, so both owe the same share of building it, keeping it up and replacing it. A neighbor about to spend that money gives the other one thirty days written notice first. Either neighbor can show the even split is wrong, and a court can then order less than half or nothing at all.
This one is California law, not Aliso Viejo law. All California findings
Adjoining landowners are presumed to share an equal benefit from any fence dividing their properties and, unless otherwise agreed to by the parties in a written agreement, shall be presumed to be equally responsible for the reasonable costs of construction, maintenance, or necessary replacement of the fence.
Also on fences on the property line in Aliso Viejo
- set in state lawThe notice has to say six things: that the law starts from an even split, what is wrong with the fence now, what is planned instead, what it is expected to cost, how the cost gets shared, and when the work happens. Civ. Code 841(b)(1)California · Statute
How tall can a fence be in Aliso Viejo?
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Aliso Viejo answers this, but the answer changes depending on whether the fence is in a side or rear yard or in the front yard setback.
Aliso Viejo allows six feet in a side or rear yard and forty two inches in a front yard setback. The handout says what the number is measured from in the same sentence, which many cities leave out: finish grade at the base of the fence, up to the highest point of the fence or wall. So the low side of a slope is not the reference and neither is an average.
Fences are limited to 6’ in height (measured from finish grade at the base to the highest point of the fence/wall) within side and rear yards. Within front yard setbacks, fences are limited to 42” in height.
The answer turns on whether the fence is in a side or rear yard or in the front yard setback.
- in a side or rear yard
- Six feet. 6 ft
- in a front yard setback
- Forty two inches. 42 in
Also on fence height in Aliso Viejo
- no rule, documents checkedCalifornia sets no limit on how tall a fence at a house can be. Cities and counties write that in their zoning codes and the answer changes a lot from one town to the next. The one height in state law is the ten feet in the spite fence rule, and that only matters when the fence was put up to annoy a neighbor. It is not a building limit. Civ. Code 841California · Statute
Do I need a permit for a fence in Aliso Viejo?
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Aliso Viejo answers this, but the answer changes depending on whether the barrier is a masonry fence or a retaining wall, its height, and whether the wall carries a surcharge or sits on a slope.
A masonry fence under seventy two inches needs no permit in Aliso Viejo, and a retaining wall escapes one up to forty eight inches from the bottom of the footing. The retaining wall exemption then has a second condition beyond height: it is gone if the wall carries a surcharge or sits at the top or the toe of a slope. Either way the handout says the construction still has to meet the building code.
Construction of masonry fences under 72” in height do not require a permit. Retaining walls not over 48” high, measured from the bottom of the footing, and not supporting a surcharge or top or toe of slope do not require a building permit.
The answer turns on whether the barrier is a masonry fence or a retaining wall, its height, and whether the wall carries a surcharge or sits on a slope.
- a masonry fence under seventy two inches
- No permit. 72 in
- a retaining wall up to forty eight inches from the bottom of the footing, no surcharge, clear of a slope
- No building permit. 48 in
- a retaining wall carrying a surcharge, or at the top or toe of a slope
- A building permit, whatever the height.
Also on permits in Aliso Viejo
- set in state lawCalifornia does not write its own building code from scratch. Section 17922 adopts Title 24 of the California Code of Regulations and requires it to ask for much the same things as the International Building Code and the International Residential Code, with state additions and cuts. So the permit rule for a fence starts out as outside code text that California then edits. Health & Saf. Code 17922California · Statute
- set in state lawA California city or county can make the statewide building code stricter, but not quietly. Section 17958.7 makes the city council say in writing why each change is needed because of local weather, ground or land shape. That finding goes to the California Building Standards Commission, and the change does nothing until it is filed. The finding is a public record, which is why a local permit line can sit well below the statewide one. Health & Saf. Code 17958.7California · Statute
Pool fence requirements in Aliso Viejo
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Aliso Viejo answers this in its own law. The words that do it are quoted below.
Every exemption in the Aliso Viejo handout stops at a pool. A fence that forms part of a pool enclosure needs a permit, with no height figure attached, so a four foot section of the same fence that would be free standing elsewhere on the lot becomes a permit job because of what is behind it. The rule turns on the function of the fence rather than its size.
Pool-related fences: A permit is required for any fence that forms part of a pool enclosure.
Also on pool barriers in Aliso Viejo
- set in state lawA pool fence in California stands at least sixty inches high. No more than two inches may be left between the ground and the bottom of it, and no gap in it may pass a four inch ball. The outside face has no handholds or footholds a child under five could climb. Gates open away from the pool and close and latch by themselves, with the latch set no lower than sixty inches above the ground. Health & Saf. Code 115923California · Statute
Spite fence laws in Aliso Viejo
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California answers this in its own law. The words that do it are quoted below.
A fence over ten feet tall in California is a private nuisance when it was put up or kept there to annoy the neighbor and the extra height serves no purpose. Height on its own is not enough. The case turns on proving why the fence is there. The rule covers anything built like a fence, not only a fence.
This one is California law, not Aliso Viejo law. All California findings
Any fence or other structure in the nature of a fence unnecessarily exceeding 10 feet in height maliciously erected or maintained for the purpose of annoying the owner or occupant of adjoining property is a private nuisance.
10 ftspite fence threshold, with malice required
How fence height is measured in Aliso Viejo
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Aliso Viejo answers this in its own law. The words that do it are quoted below.
Two fences standing less than thirty inches apart are one fence in Aliso Viejo, measured from the base of the lower to the top of the higher. The gap is measured between the facing sides rather than center to center. A pair of legal fences stepped up a bank would otherwise read as two short fences and stand as one tall one, and this rule is what stops that.
If fences are less than 30” apart (measured between adjoining faces), they are considered one structure and they are measured from the base of the lower fence to the top of the higher fence.
30 ingap below which two fences count as one structure
Also on how height is measured in Aliso Viejo
- left to the townCalifornia gives a fence height and never says what it is measured from. Civil Code section 841.4 makes a fence over ten feet a private nuisance when it is kept up to annoy a neighbor. It does not say whether the ten feet starts at bare dirt, at the finished yard, or at the high side of a slope. Government Code section 65850 is why the state stops there: it lets any county or city set the place, height and size of structures. So the number and the surface it starts from are both written into local zoning. Cal. Gov. Code 65850(c)(1)California · Zoning code
Fence rules for corner lots in Aliso Viejo
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California answers this in its own law. The words that do it are quoted below.
California writes no clear view triangle into state law. The Streets and Highways Code counts a fence as an encroachment once it stands in, under or over any part of a state highway right of way. Section 670 then makes putting one there without a written permit from the department a misdemeanor. That covers the public strip, not the corner of a private yard. Government Code section 65850 gives every city and county the power to set the height and place of structures, and that is where a corner triangle gets written in California.
This one is California law, not Aliso Viejo law. All California findings
“Encroachment” includes any tower, pole, pole line, pipe, pipe line, fence, billboard, stand or building, or any structure, object of any kind or character not particularly mentioned in this section, or special event, which is in, under, or over any portion of the highway.
Retaining wall rules in Aliso Viejo
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Aliso Viejo does not set this. It leaves it to Title 24 of the California Code of Regulations, the California Building Standards Code, which tracks the International Building Code and the International Residential Code.
California has no rule of its own in statute for a wall that holds back earth. The rule is in Title 24 of the California Code of Regulations, which section 17922 adopts by reference and requires to match the newest editions of a named list of outside codes, the International Building Code and the International Residential Code among them. The same section leaves setbacks, side yards, rear yards and property line rules entirely to cities and counties.
This one is California law, not Aliso Viejo law. All California findings
The building standards and rules and regulations shall impose substantially the same requirements as are contained in the most recent editions of the following international or uniform industry codes as adopted by the organizations specified:
The code hands this to Title 24 of the California Code of Regulations, the California Building Standards Code, which tracks the International Building Code and the International Residential Code, which is not published in the code itself.
Fence materials allowed in Aliso Viejo
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California answers this in its own law. The words that do it are quoted below.
California sets a wire standard for a lawful fence in grazing counties. A wire fence takes three tight barbed wires on solid posts set no more than a rod apart, with one wire at least four feet up. Any fence as strong and as tall as that one counts too.
This one is California law, not Aliso Viejo law. All California findings
No wire fence is a good and substantial fence within the meaning of this article unless it has three tightly stretched barbed wires securely fastened to posts of reasonable strength, firmly set in the ground not more than one rod apart, one of which wires shall be at least four feet above the surface of the ground.
3 strandsbarbed wires in a lawful wire fence
Livestock and boundary fence law in Aliso Viejo
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California answers this in its own law. The words that do it are quoted below.
California calls a fence lawful when it is strong enough to keep livestock from getting in or out. A wire fence gets real numbers: three tight barbed wires on posts set no more than one rod apart, with one of those wires at least four feet off the ground. Any other fence as tall, as strong and as good at holding animals counts too, and so does a cattle guard wide and deep enough to turn them.
This one is California law, not Aliso Viejo law. All California findings
No wire fence is a good and substantial fence within the meaning of this article unless it has three tightly stretched barbed wires securely fastened to posts of reasonable strength, firmly set in the ground not more than one rod apart, one of which wires shall be at least four feet above the surface of the ground.
4 ftheight of the top wire on a lawful wire fence
Also on agricultural fencing in Aliso Viejo
- depends, see the pageCalifornia answers this one county by county. Section 17123 names Siskiyou, Lassen and Modoc, plus parts of Trinity and Shasta, as land used mainly for grazing. Section 17124 lets the board of supervisors of any county put the same label on the county or part of it. Where the label applies, the land has to be fully fenced before the person on it may take in a stray animal or hold it for payment. Cal. Food & Agric. Code 17122California · Statute
Documents behind this page
10 documents, of which 1 was published by Aliso Viejo itself. Each was read on the date shown.
- California LegislatureCalifornia Civil Code Section 841, Good Neighbor Fence Act of 2013
- California LegislatureCalifornia Civil Code Section 841.4, spite fences
- City of Aliso Viejo, Building DepartmentFences and Walls handout, 08/27/2026
- California LegislatureCalifornia Health and Safety Code Section 17922, adoption of building standards
- California LegislatureCalifornia Health and Safety Code Section 17958.7, local modification of building standards
- California LegislatureCalifornia Health and Safety Code Section 115923, enclosure requirements
- California LegislatureCalifornia Government Code, Title 7, Division 1, Chapter 4, Article 2, Section 65850
- California LegislatureCalifornia Streets and Highways Code, Division 1, Chapter 3, Section 660
- California LegislatureCalifornia Food and Agricultural Code, Division 9, Part 2, Chapter 3, Article 5
- California LegislatureCalifornia Food and Agricultural Code, Division 9, Part 2, Chapter 3, Article 5
What this page does not cover
A city ordinance is not the only rule that reaches a fence. The zoning district a parcel sits in can change the height allowed on it, and so can an overlay district, a recorded easement, a fire hazard severity zone or a coastal zone. A homeowner association can be stricter than the city and nothing in the municipal code will say so. None of those appear here.
The rules above are the ones Aliso Viejo publishes, plus the California rules that apply where the city sets none. Fence laws in California has the state layer in full.
This is general information drawn from published government documents. It is not legal advice, ordinances are amended, and the date beside each finding is the date the document was read. How findings are made · What the terms mean