Not the same as the Village of Webster. The Village of Webster has no ADU rule; some older houses can be split into two units with zoning board approval. See Monroe County. Check which one is on your property tax bill.
Webster allows an accessory apartment inside the house or in a qualifying outbuilding on a large lot, with size caps and a recorded agreement.
The code describes a way to approve an ADU with a permit, without a special public hearing for the ADU itself.
Whether any of this applies to your lot depends on your zoning district and your property.
The rules we found
| What the code says | Allowed with a permit |
|---|---|
| Detached (backyard) unit | Yes, in a qualifying accessory building on a lot at least twice the district minimum |
| Inside or attached | Yes, in R1, R2, R3 and LL |
| Size limit | Internal: 750 sq ft or 35% of the house, whichever is smaller. Detached: 500 sq ft or 35% of the accessory building, whichever is smaller |
| Bedrooms | Not stated in the code we read |
| Owner must live on site | Owner-occupancy clause applies; how it applies to detached units needs confirmation |
| How approval works | Building permit and certificate of occupancy; Planning Board can waive some standards |
| Other rules | One apartment per home. It shares utility services with the house, and you sign an agreement that is recorded in the property records. |
Code section: §350-50B-E (Town of Webster accessory apartments)
What we’re still confirming
- This comes from our review of the code on September 16, 2026. Confirm with the town before you rely on it.
Before you spend money on drawings
- Confirm the Town of Webster governs your lot: it should be the municipality on your property tax bill.
- Find your zoning district on the municipal zoning map; the rules above can differ by district.
- Call or write the code office with your address and what you’re picturing, and ask for the answer and the code section in writing.
- On septic or a well? Ask the Monroe County health department whether the system can serve an extra bedroom. On public sewer? Ask your sewer district.
Our guides explain the approval process, site and utility checks and what an ADU costs.
Sources
General information, not legal advice. The Town of Webster decides what can be built on your property.