| Max size | 1,000 sq ftconfirmed with the town |
|---|---|
| Min size | 300 sq ftconfirmed with the town |
| Bedrooms | No Regulationsconfirmed with the town |
| Type | Attached or detachedeither one, by right under state law |
| Parking | 1 Spot for ADUconfirmed with the town |
| Owner-occupancy | Requiredin either the ADU or the primary home |
| Short-term rental | Not capturedpending verification |
| Utility connection | Tie into the existing electrical connection or choose a separate metersame statewide |
CONFIRMED WITH THE TOWN (9/16/26) — ADUs allowed: 1; maximum size 1,000 sq ft; minimum size 300 sq ft; up to No Regulations bedrooms; impact fees: No; parking: 1 Spot for ADU; detached-unit distance rule: no; setbacks: Rural - 35’ Front 20’ Side/Rear. 75’ from water body, 50’ wetlands. Town contact: Bri - Community Development.
None at this time. Extremely responsive
Pat called and verified on 9/16/26
Start with the state-law floor, because in Gilmanton it's currently the most reliable rule available: under RSA 674:71-73 (as amended by HB 577, effective July 1, 2025), every homeowner in a district that permits single-family homes is entitled to one accessory dwelling unit by right — attached or detached — with no special exception or conditional-use permit allowed for that one by-right unit. Gilmanton's own ADU zoning text could not be obtained for this record, so town-specific rules (districts, size limits, permit type, parking, owner-occupancy, setbacks) are pending verification and no town-vs-state conflicts could be assessed. What IS confirmed from town documents: the building permit application form lists 'ADU' as its own checkbox under 'Construction Category' — confirming Gilmanton's building department processes ADU permit applications; setback figures for any structure are governed by 'Zoning Article IV Table 2' (referenced in the permit form, not yet reviewed); the Building Inspector/Code Enforcement Officer is Bob Garside (603-267-6700 ext 123, building@gilmantonnh.org); building applications are reviewed in 3-5 business days; fees for electrical/mechanical/plumbing permits are $50 each, with other permit fees calculated at approval per a fee schedule published on gilmantonnh.org; and ADU projects, like all building projects, need a scaled site plan showing distances from all four lot lines. If Gilmanton's zoning is in fact silent on ADUs, the state-law entitlement still applies, subject only to standard building-permit review — but the town's actual ordinance (likely Article IV or a dedicated ADU article) should be confirmed before relying on any specific local detail.
Get a free personalized report for your address in Gilmanton — including where the 2025 law works in your favor.
Get My Free Gilmanton ADU Report →House Bill 577 (2025) amended RSA 674:72, effective July 1, 2025. Wherever Gilmanton's ordinance is stricter than this floor, the state law controls. Read the full NH ADU law explainer →
State law guarantees Gilmanton homeowners at least one ADU by right — attached or detached — wherever single-family homes are permitted (RSA 674:71-73 as amended by HB 577, effective July 1, 2025). Gilmanton's own ADU zoning text could not be confirmed for this record, so local districts, size caps, and permit details are pending verification. 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.
1,000 sq ft — confirmed with the town. State law doesn't let any town cap ADU size below 750 sq ft.
Attached or detached (either one, by right under state law). Since July 1, 2025, state law allows detached ADUs by right statewide — town provisions that prohibited them are superseded.
1 Spot for 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.
Required — in either the ADU or the primary home. Where owner-occupancy is required, state law lets the owner choose which unit to live in.