| Max size | 1,500 sq ftconfirmed with the town |
|---|---|
| Min size | not specified |
| Bedrooms | not specified |
| Type | Not statednot addressed in the ordinance |
| Parking | 1 spot for each ADUconfirmed with the town |
| Owner-occupancy | not specified |
| Short-term rental | Not statednot addressed in the ordinance |
| Utility connection | Tie into the existing electrical connection or choose a separate metersame statewide |
CONFIRMED WITH THE TOWN (July 20, 2026) — ADUs allowed: 2 by-right; maximum size 1,500 sq ft; impact fees: None specified in zoning; parking: 1 spot for each ADU; detached-unit distance rule: no; setbacks: 30' front, 20' side and rear. Town contact: antrimnh.org - voicemails can take two days to return - Darby Wilson, planning assistant planning@antrimnh.gov 603-547-0494 Inspector is Dario (also for Concord, NH)- nhbuildinginspector@gmail.com.
Although 1500sqft is max size, ADU can't be more than 50% of the gross living area of primary dwelling. If ADU is attached, it needs to have a separate exterior entrance. Allowed in every zone except institutional. In residential zones, lot coverage max for dwellings is 35%
Max size is now 1,500sqft - and TWO ADUs are allowed by right - one attached one detached! Even if you build two, they can both be 1500sqft OR no more than 50% of primary dwelling unit. No distance regulations for detached. No new curb cuts - one parking spot per ADU - If attached, needs to have separate entrances. In new construction, alarms must be interconnected so all sound when one is triggered. No minimum square footage specified in zoning. Permitted in every zoning district except for institutional. Setbacks are 30' front, 20' side and rear. Residential is typically no more than 35% lot coverage. Maximum bedroom count is not specified. "Planning board is very progressive". No Impact fees. General building permit, no specific ADU permit. Short Term rental not specified but would fall under the town's short term zoning regs - no owner occupancy requirement stated in zoning reg.
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Get My Free Antrim ADU Report →House Bill 577 (2025) amended RSA 674:72, effective July 1, 2025. Wherever Antrim's ordinance is stricter than this floor, the state law controls. Read the full NH ADU law explainer →
Yes — Antrim allows 2 by-right ADUs (verified with the town), up to 1,500 sq ft. Under RSA 674:72 (as amended effective July 1, 2025), one accessory dwelling unit — attached or detached — is allowed by right on single-family lots statewide.
1,500 sq ft — confirmed with the town. State law doesn't let any town cap ADU size below 750 sq ft.
Since July 1, 2025, state law allows detached ADUs by right statewide — town provisions that prohibited them are superseded.
1 spot for each ADU — confirmed with the town. State law caps what any town can require at one additional space, located on- or off-site at the owner's choice.
not specified. Where owner-occupancy is required, state law lets the owner choose which unit to live in.