ADU · Dutchess County

Can you build an ADU in Dover, NY?

Town of Dover has 8 districts. 7 districts allow ADUs with occupancy restrictions, 1 does not. Check your address to confirm the district that applies to your parcel:

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What the Dover code says

An accessory apartment needs a Planning Board special permit in RU, RC, HM, HR, SR, HC and CO, and is prohibited in M. It must be inside an owner-occupied structure or in an accessory structure on an owner-occupied property.

Conditions the code attaches:

One accessory apartment per single-family dwelling, in the principal building or an accessory structure as the Use Table provides (§ 145-12C).
The lot must carry the minimum acreage required by the Dimensional Table.
In mixed-use and commercial districts, each lot may have one apartment of up to 1,000 sq ft above a nonresidential use by right as an accessory apartment (§ 145-12B(5)); owner occupancy still applies.
Building Department: (845) 832-6111.

What the Dover code indicates by district

The table below shows how each district treats ADUs, alongside the lot and setback standards that govern a second unit. District boundaries and conditions vary, so treat this as a starting point and confirm the district that applies to your parcel.

District	Min lot	Setbacks F / S / R	Max height	ADU
Rural District	2 ac	40 / 30 / 50 ft	35 ft	Occupancy restricted
Resource Conservation District	5 ac	40 / 30 / 50 ft	35 ft	Occupancy restricted
Hamlet Mixed-Use District	1 ac	25 / 10 / 25 ft	45 ft	Occupancy restricted
Hamlet Residential District	1 ac	25 / 15 / 25 ft	40 ft	Occupancy restricted
Suburban Residential	1 ac	50 / 30 / 50 ft	35 ft	Occupancy restricted
Highway Commercial District	1 ac	25 / 30 / 50 ft	45 ft	Occupancy restricted
Commercial/Industry/Office Mixed-Use District	1 ac	50 / 30 / 50 ft	35 ft	Occupancy restricted
Industrial/Manufacturing District	5 ac	100 / 50 / 75 ft	35 ft	No

Rural District - Front yards and road frontage are measured from the center line of the road, not the property line, and the front yard is 60 ft on a county or state road. Coverage caps all impermeable surface at 10%, not just building footprint (§ 145-73).

Minimum road frontage is 100 ft on a private road, 250 ft on a Town road and 300 ft on a county or state road; conservation density subdivision lots and rear lots may have less (§§ 145-21, 145-22).
The coverage cap applies to each lot and to a whole subdivision including its new roads and public areas; in a flexible subdivision it applies to the subdivision as a whole only.
A nonresidential structure may not exceed 6,000 sq ft of footprint, excluding agricultural structures and anything legally completed or permitted before this chapter was adopted.
A flexible subdivision is the alternative to the conventional lot minimum, with its density, lot dimensions and setbacks set by §§ 145-19C and 145-19D instead.
The front yard may also be adjusted to the prevailing setbacks of the immediate neighbourhood on any road.
Height is measured above average grade, with exceptions in § 145-30D.

Resource Conservation District - Front yards and road frontage are measured from the center line of the road, not the property line, and the front yard is 60 ft on a county or state road. Coverage caps all impermeable surface at 10%, not just building footprint (§ 145-73).

Minimum road frontage is 100 ft on a private road, 250 ft on a Town road and 400 ft on a county or state road; conservation density subdivision lots and rear lots may have less (§§ 145-21, 145-22).
The coverage cap applies to each lot and to a whole subdivision including its new roads and public areas; in a flexible subdivision it applies to the subdivision as a whole only.
A nonresidential structure may not exceed 4,000 sq ft of footprint, excluding agricultural structures and anything legally completed or permitted before this chapter was adopted.
A flexible subdivision is the alternative to the conventional lot minimum, with its density, lot dimensions and setbacks set by §§ 145-19C and 145-19D instead.
The front yard may also be adjusted to the prevailing setbacks of the immediate neighbourhood on any road.
Height is measured above average grade, with exceptions in § 145-30D.

Hamlet Mixed-Use District - Lot area is set by infrastructure under § 145-11D, and the one-acre minimum shown is the unserviced case. Front yards and road frontage are measured from the center line of the road, and the front yard is 30 ft on a county or state road.

A maximum setback or build-to line may be established in the HM and HR districts to maintain the street wall.
The side yard may be zero for a party-wall or zero-lot-line building.
Minimum road frontage is 50 ft on a private road, 80 ft on a Town road and 100 ft on a county or state road; conservation density subdivision lots and rear lots may have less (§§ 145-21, 145-22).
Coverage caps all impermeable surface at 50%, not just footprint (§ 145-73), on each lot and across a subdivision with its new roads and public areas; a flexible subdivision counts only as a whole.
A nonresidential structure may not exceed 10,000 sq ft of footprint, excluding agricultural structures and anything legally completed or permitted before this chapter was adopted.
That footprint may be enlarged to 50,000 sq ft for a supermarket or another use deemed essential to the economic viability of the hamlet.

Hamlet Residential District - Lot area is set by infrastructure under § 145-11D, and the one-acre minimum shown is the unserviced case. Front yards and road frontage are measured from the center line of the road, and the front yard is 40 ft on a county or state road.

A maximum setback or build-to line may be established in the HM and HR districts to maintain the street wall.
The side yard may be zero for a party-wall or zero-lot-line building.
Minimum road frontage is 50 ft on a private road, 70 ft on a Town road and 100 ft on a county or state road; conservation density subdivision lots and rear lots may have less (§§ 145-21, 145-22).
Coverage caps all impermeable surface at 30%, not just footprint (§ 145-73), on each lot and across a subdivision with its new roads and public areas; a flexible subdivision counts only as a whole.
A nonresidential structure may not exceed 1,000 sq ft of footprint, excluding agricultural structures and anything legally completed or permitted before this chapter was adopted.
The front yard may also be adjusted to the prevailing setbacks of the immediate neighbourhood on any road.

Suburban Residential - Front yards and road frontage are measured from the center line of the road, not the property line, and the front yard is 75 ft on a county or state road. Coverage caps all impermeable surface at 20%, not just building footprint (§ 145-73).

Minimum road frontage is 100 ft on a private road and 200 ft on a Town, county or state road; conservation density subdivision lots and rear lots may have less (§§ 145-21, 145-22).
The coverage cap applies to each lot and to a whole subdivision including its new roads and public areas; in a flexible subdivision it applies to the subdivision as a whole only.
A flexible subdivision is the alternative to the conventional lot minimum, with its density, lot dimensions and setbacks set by §§ 145-19C and 145-19D instead.
The front yard may also be adjusted to the prevailing setbacks of the immediate neighbourhood on any road.
Height is measured above average grade, with exceptions in § 145-30D.

Highway Commercial District - Where the lot abuts a residential district the setback rises to 100 ft with a wooded buffer. Front yards and road frontage are measured from the center line of the road, and the front yard is 35 ft on a county or state road.

Coverage caps all impermeable surface at 60%, not just footprint (§ 145-73), on each lot and across a subdivision with its new roads and public areas; a flexible subdivision counts only as a whole.
The side yard may be zero for a party-wall or zero-lot-line building.
Minimum road frontage is 200 ft on a Town road and 300 ft on a county or state road; conservation density subdivision lots and rear lots may have less (§§ 145-21, 145-22).
A nonresidential structure may not exceed 40,000 sq ft of footprint, excluding agricultural structures and anything legally completed or permitted before this chapter was adopted.
The front yard may also be adjusted to the prevailing setbacks of the immediate neighbourhood on any road.
Height is measured above average grade, with exceptions in § 145-30D.

Commercial/Industry/Office Mixed-Use District - Where the lot abuts a residential district the setback rises to 100 ft with a wooded buffer. Front yards and road frontage are measured from the center line of the road, and the front yard is 150 ft on a county or state road.

Coverage caps all impermeable surface at 40%, not just footprint (§ 145-73), on each lot and across a subdivision with its new roads and public areas; a flexible subdivision counts only as a whole.
The side yard may be zero for a party-wall or zero-lot-line building.
Minimum road frontage is 100 ft on a private road and 200 ft on a Town, county or state road; conservation density subdivision lots and rear lots may have less (§§ 145-21, 145-22).
A nonresidential structure may not exceed 200,000 sq ft of footprint, excluding agricultural structures and anything legally completed or permitted before this chapter was adopted.
The front yard may also be adjusted to the prevailing setbacks of the immediate neighbourhood on any road.
Height is measured above average grade, with exceptions in § 145-30D.

Industrial/Manufacturing District - Where the lot abuts a residential district the setback rises to 100 ft with a wooded buffer. Front yards and road frontage are measured from the center line of the road, and the front yard is 200 ft on a county or state road.

Coverage caps all impermeable surface at 30%, not just footprint (§ 145-73), on each lot and across a subdivision with its new roads and public areas; a flexible subdivision counts only as a whole.
Minimum road frontage is 100 ft on a private road and 200 ft on a Town, county or state road; conservation density subdivision lots and rear lots may have less (§§ 145-21, 145-22).
The front yard may also be adjusted to the prevailing setbacks of the immediate neighbourhood on any road.
Height is measured above average grade, with exceptions in § 145-30D.

ADUs vs. short-term rentals in Dover

No local short-term-rental law on record - which is not the same as permission for Town of Dover. As of June 2026 the Town of Dover has no local short-term rental law, and that is not the same as permission. Confirm with the Town of Dover Building Department before counting on short-term rental income. These are separate questions from whether you can build an ADU — a unit you're allowed to add isn't automatically one you're allowed to rent nightly, so check both.

Good to know

Residential lot minimum1–2 ac — an ADU still has to fit the district's lot and setback envelope.
UtilityCentral Hudson territory.
Zoning codeecode360.com/11750852
Building dept(845) 832-6111

ADU FAQ — Dover, NY

Are ADUs allowed in Dover, NY?

Town of Dover has 8 districts. 7 districts allow ADUs with occupancy restrictions, 1 does not. Check your address with the free ADU checker, or confirm with the building department at (845) 832-6111.

Do I need a special permit for an ADU in Dover?

No district in Town of Dover requires a special-use permit for an ADU - 7 districts allow ADUs with occupancy restrictions, 1 does not. Site-plan review or a building permit may still apply.

Can I use an ADU as a short-term rental in Dover?

No local short-term-rental law on record - which is not the same as permission for Town of Dover. ADU occupancy and short-term-rental rules are separate: an ADU you can build isn't automatically one you can rent nightly. Confirm both before you count on STR income.

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What an ADU costs to build in Dover

Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $210k–275k at a standard finish, and the per-square-foot rate comes in above a full house because the kitchen, bath, panel and heating plant cost the same either way. See the full cost to build an ADU in Dover, priced by size.

How we know this

Sections analyzed: Ch. 145 § 145-10B Use Table (amended 11-23-2009 by L.L. No. 2-2009); § 145-12C; § 145-12B(5); § 145-74 definition; § 145-8A districts
Districts confirmed: 8 of 8 — every mapped district.
Last reviewed: 2026-08-16
Not covered here: Overlay districts, the zoning map, and any conditions attached to an individual parcel. Size limits and owner-occupancy terms sit in the code section above, not in this summary.

More on Dover: Full zoning for new construction · ADU build cost · House build cost · ADU rules across Dutchess County · All Dutchess County towns

ADU information for Town of Dover is compiled from the municipal code (last reviewed 2026-08-16) and provided for decision-support only — not legal or architectural advice. ADU eligibility, size, owner-occupancy and permit conditions vary by district and often carry exceptions; verify with the building department at (845) 832-6111 before relying on any answer. Source: the Offsite / Aldo zoning dataset.