Splitting a Fence With Your Neighbor: California’s Good Neighbor Fence Act, Explained for Sacramento Homeowners

If the fence between your yard and your neighbor’s is leaning, rotting at the posts, or missing pickets, the first question most Sacramento homeowners ask is not how to build it — it is who pays for it.

California has a specific answer for shared boundary fences. It is in California Civil Code §841, known as the Good Neighbor Fence Act of 2013. This guide explains, in plain language, what that law presumes, what written notice it requires before work starts, and where the equal split does — and does not — apply.

This article is general information only, not legal advice. For a dispute or a specific legal question, talk to a qualified California real estate attorney.

The basic rule: a boundary fence is presumed to be shared

Section 841(a) says adjoining landowners share equally in the responsibility for maintaining the boundaries and monuments between them.

Section 841(b)(1) goes one step further for fences. Adjoining landowners are presumed to share an equal benefit from any fence dividing their properties and, unless they have agreed otherwise in a written agreement, they are presumed to be equally responsible for the reasonable costs of construction, maintenance, or necessary replacement of the fence.

Three words in that sentence do most of the work:

• Presumed — equal responsibility is the starting point, not an absolute rule. As explained below, it can be overcome with evidence that an equal split would be unjust.
• Reasonable — the law covers reasonable costs, not any cost one side chooses to spend.
• Boundary fence — the fence dividing the two properties. A fence built entirely inside one yard for that owner’s own purpose is a different situation.

“Adjoining” under §841(c)(2) simply means contiguous to or in contact with. And “landowner” under §841(c)(1) means a private person or entity that lawfully holds a possessory interest in the property — it does not include a city, county, district, or other public agency. If the property on the other side of your fence is owned by a public agency, §841’s shared-cost presumption does not apply to that agency in the same way.

The 30-day written notice — required before you incur costs

This is the step homeowners most often miss, and it matters. Under §841(b)(2), where a landowner intends to incur costs for a shared fence, that landowner shall give 30 days’ prior written notice to each affected adjoining landowner.

The notice is not just “we are replacing the fence.” The statute lists what it shall include:

1. Notification of the presumption of equal responsibility for the reasonable costs of construction, maintenance, or necessary replacement of the fence.
2. A description of the nature of the problem facing the shared fence — for example, posts rotted at the ground line, a lean that is getting worse, or sections that have failed.
3. The proposed solution for addressing the problem — repair, partial rebuild, or full replacement, and in general terms what will be built.
4. The estimated construction or maintenance costs involved to address the problem.
5. The proposed cost-sharing approach and the proposed timeline for getting the problem addressed.

Practical takeaways from that list:

• Put it in writing and keep a copy with the date you delivered it. An undocumented conversation is hard to prove later.
• Send it before work starts and before costs are incurred — the statute describes 30 days’ prior notice.
• If you share a fence line with more than one neighbor — a corner lot, for example — notice goes to each affected adjoining landowner.
• Use the notice period to talk. In our experience across Sacramento, Fair Oaks, Citrus Heights, Carmichael, Roseville, Folsom, and El Dorado Hills, most shared-fence projects go smoothly when both sides see the same problem description, the same proposal, and the same timeline before anyone signs anything.

Who pays when one side wants an upgrade?

The presumption covers the reasonable cost of a necessary fence — not one neighbor’s upgrade. Section 841(b)(3)(D) makes the reasonableness of a project an explicit factor a court considers, including:

• The extent to which the costs appear to be unnecessary or excessive, and
• The extent to which the costs appear to be the result of the landowner’s personal aesthetic, architectural, or other preferences.

In plain terms: if a sound, standard replacement would solve the problem, but one owner wants a taller, more decorative, or premium-material design beyond that, expect the extra cost driven by that preference to fall on the owner who wants it — unless you both agree otherwise in writing. That written-agreement option in §841(b)(1) is the cleanest tool here: if you agree on a design and a different split, write it down and both sign it before work begins.

The same logic works in reverse. A basic, well-built fence is easier for both sides to agree is reasonable. When we build a shared fence, the build itself is straightforward and defensible as a standard, durable replacement: posts set 2 to 3 feet deep in concrete, a waterproof membrane wrap below ground, pressure-treated posts and rails, redwood pickets, and Simpson steel connectors fastened with screws — never nails. That is not a luxury specification; it is how a fence avoids the shallow-post rot and lean that created the problem in the first place.

When an equal split can be challenged

Equal responsibility is a presumption, and §841(b)(3) says it may be overcome by a preponderance of the evidence demonstrating that imposing equal responsibility would be unjust. If that happens, §841(b)(4) gives a court discretion to order a contribution of less than an equal share, or no contribution at all.

The statute lists the factors a court shall consider:

• (A) Whether the financial burden to one landowner is substantially disproportionate to the benefit that landowner gets from the fence.
• (B) Whether the cost of the fence would exceed the difference in the value of the real property before and after its installation.
• (C) Whether the financial burden would impose an undue financial hardship given that party’s financial circumstances, as demonstrated by reasonable proof.
• (D) The reasonableness of the particular construction or maintenance project, including unnecessary or excessive costs and costs driven by personal preferences (see above).
• (E) Any other equitable factors appropriate under the circumstances.

You do not need to be planning a court case for this section to be useful. Those five factors are a good checklist for a fair conversation with your neighbor before there is a disagreement at all: Is the benefit roughly equal? Is the project reasonable in scope and cost? Is anyone being asked to carry a burden out of proportion to what they get?

Permits, city rules, and HOAs still apply

The Good Neighbor Fence Act answers the cost-sharing question. It does not replace your city’s fence rules or your HOA’s design review. Height limits, front-yard rules, and permit requirements still come from your city or county — we covered Sacramento’s own rules, verified from official City sources, in our guide to Sacramento fence rules: heights, permits and front-yard limits. If you live in an HOA community, check the association’s fence specifications and get any required approval before the 30-day notice timeline runs out, so the proposed solution in your notice matches what the HOA will actually allow.

A workable order of operations

1. Walk the fence line together if you can, and agree on what is actually failing.
2. Get a written proposal that describes the problem and the fix clearly enough to attach to, or summarize in, your notice.
3. Send the 30-day written notice with all five elements from §841(b)(2), to each affected neighbor.
4. Agree the split in writing — equal, or a different arrangement you both choose — especially if either side wants an upgrade.
5. Build once, to a reasonable standard, and keep the invoice and the agreement with your house records.

With more than 30 years of hands-on experience in this trade, we have seen the pattern from both sides: shared fences rarely cause trouble because of the building. They cause trouble when the conversation and the paperwork happened after the bill. The Act is built to prevent exactly that — notice first, agreement in writing, then work.

Frequently asked questions

Do we always have to split a shared fence 50/50?

That is the presumption in Civil Code §841(b)(1) for the reasonable costs of construction, maintenance, or necessary replacement — unless you have a different written agreement, or a court finds, under the §841(b)(3) factors, that an equal split would be unjust and orders a smaller contribution or none.

What if my neighbor never replies to my notice?

The statute requires you to give the 30-day prior written notice with the listed contents; it does not describe silence as agreement. Keep proof of delivery, keep the notice complete, and if a neighbor will not engage and the fence genuinely needs work, get legal advice about your specific situation before proceeding — this article is general information, not legal advice.

Can I be charged for my neighbor’s decorative upgrade?

The shared presumption covers reasonable costs. Under §841(b)(3)(D), a court specifically considers whether costs are unnecessary or excessive, or result from one landowner’s personal aesthetic or architectural preferences. Practically: agree any upgrade and who pays for the extra in writing, before work starts.

Do you warranty a shared fence you build?

Yes. Every fence we build carries a 12-month workmanship warranty on work we performed completely.

Planning a shared fence in the Sacramento area?

American Gardens Landscaping builds custom wood and metal fences across Sacramento and the surrounding area — and we are glad to provide the clear, written proposal your Good Neighbor notice needs: the problem, the proposed fix, and a timeline, in one document both neighbors can review. See our fencing services or call (916) 579-3063 for a free estimate.

Licensed • Bonded • Insured — CSLB Lic. #1105341

Regulations change. For the latest updates, please contact your city to confirm before building.