Accessory Apartment (ADU) Permit Consultant in Westchester County
N3 is an accessory apartment permit consultant in Westchester County for homeowners adding an ADU — a legal second living unit. ADU rules change from town to town: owner-occupancy conditions, size caps, parking, and setbacks all vary. We check whether your property qualifies, coordinate the plans, and manage the approval through the town’s boards
N3 is a coordinator and advocate, not an architect or builder; we bring in the licensed professionals and keep the filing on track.
ADU rules vary by town
Westchester does not have one ADU rule — each town and village sets its own. Before drawings or budgets, an ADU zoning feasibility check in Westchester tells you whether the unit is even allowed on your lot and under what conditions. That single step saves the most time and money.
The approval path
A typical ADU moves through zoning feasibility, then plans, then the town’s review — which can include the Planning Board, the Zoning Board of Appeals for any variance, and Architectural Review. N3 coordinates each hand-off so the project does not stall between them.
1. Feasibility
We confirm whether an ADU is allowed on your property.
2. Plans
Plans are prepared with the required details and studies.
3. Boards
The project goes through Planning Board, ZBA (if needed), and ARB.
4. Permit
Once approvals are in place, the building permit can be issued.
Architectural Review Board approval
Many Westchester villages route exterior changes through a design board. Architectural review board approval in Westchester County NY looks at materials, massing, and how the addition reads from the street. N3 prepares the submission to match what the board expects to see, which is what clears review the first time.
Programs worth knowing
Some Westchester municipalities and county programs support accessory apartments as a housing tool. We flag any relevant program so you have the full picture — helpful context, not something N3 competes with.
Programs worth knowing
Some Westchester municipalities and county programs support accessory apartments as a housing tool. We flag any relevant program so you have the full picture — helpful context, not something N3 competes with.
frequently asked questions
Q: Is an ADU allowed on my property?
A: Only a town-specific zoning feasibility check answers that. Rules vary widely across Westchester — we run that check first.
Q: Will I need architectural review?
A: In many villages, yes, for anything visible from the street. We prepare the ARB submission.
Q: Do I need an architect?
A: Usually yes for the plans. N3 coordinates the architect and manages the town filing.
