New York · Livingston County
ADU rules in Livingston County, town by town
New York has no statewide ADU law, so each town, village and city writes its own rules. We’ve checked 14 municipal codes in Livingston County so far. 5 of them describe a current way to approve an ADU or accessory apartment.
Don’t see your town? We haven’t checked its code yet. Start with the guide to checking local rules, or send us a question.
A village has its own zoning, separate from the town around it, and a ZIP code can cover both. Check which government is on your property tax bill. This table is a screening guide, not a permit answer: your zoning district and your lot decide. Codes change, so confirm with the code office before you spend money.
| Municipality | What the code says | Detached unit? | Size limit | Owner on site? | Checked |
|---|---|---|---|---|---|
| Town of Avon | No ADU rules yet Not confirmed yet | Likely not: one principal building per residential lot (§130-24A) | Code doesn’t say | Code doesn’t say | October 3, 2026 |
| Village of Avon | Allowed; permit type not confirmed | Yes, in an accessory structure that meets all accessory-structure rules; not in a… | No ADU-specific cap found; accessory-structure size, setback, coverage and height rules… | Yes. An owner lives on site at least nine months a year; rent may be collected on only… | October 3, 2026 |
| Town of Caledonia | Allowed with a permit | Yes: in an existing accessory building or a new detached accessory building that meets… | At least 300 sq ft of living space; no more than 50% of the main house's living space | Yes. The owner's primary residence is one of the units; affidavit at application and… | October 3, 2026 |
| Village of Caledonia | No ADU rules yet Not confirmed yet | Not addressed | Code doesn’t say | Code doesn’t say | October 3, 2026 |
| Town of Conesus | No ADU rules yet Not confirmed yet | Not addressed | Code doesn’t say | Code doesn’t say | October 3, 2026 |
| Village of Dansville | No ADU rules yet Not confirmed yet | Likely not: one principal building per lot (§702A) | Code doesn’t say | Code doesn’t say | October 3, 2026 |
| Town of Geneseo | ADU defined, rules not found yet Not confirmed yet | The definition includes reuse of an existing detached barn, carriage house or garage | Code doesn’t say | Code doesn’t say | October 3, 2026 |
| Village of Geneseo | Allowed; permit type not confirmed | No. Only inside an existing main building | No more than 40% of the main unit or 600 sq ft, whichever is smaller | Yes. The owner lives in the main unit | October 3, 2026 |
| Town of Lima | No ADU rules yet Not confirmed yet | Not addressed | Code doesn’t say | Code doesn’t say | October 3, 2026 |
| Village of Lima | No ADU rules yet Not confirmed yet | Not addressed | Code doesn’t say | Code doesn’t say | October 3, 2026 |
| Town of Livonia | Allowed with a special use permit | Yes, in an accessory building | No more than 40% of the main dwelling unit's area | Yes. The owner lives in either unit | October 3, 2026 |
| Village of Livonia | Allowed; permit type not confirmed | Yes, in an accessory building | No more than 40% of the main dwelling unit's area | Yes. The owner lives in either unit | October 3, 2026 |
| Town of Mount Morris | No ADU rules yet Not confirmed yet | Not addressed | Code doesn’t say | Code doesn’t say | October 3, 2026 |
| Village of Mount Morris | No ADU rules yet Not confirmed yet | Not addressed | Code doesn’t say | Code doesn’t say | October 3, 2026 |
Dates link to the code we read. “No ADU rules yet” means we found no ADU rules in the code. That isn’t permission, and some codes allow only one home or one main building on a lot: here’s what to do.
Room for what comes next
Planning an ADU in Livingston County?
Understand the rules, compare your options and make a list of questions for your municipality.