ADU · Albany County
Can you build an ADU in Cohoes, NY?
City of Cohoes has 16 districts. 7 districts allow ADUs with occupancy restrictions, 5 do not. 4 districts have incomplete data - verify with the building department at (518) 233-2127. Check your address to confirm the district that applies to your parcel:
What the Cohoes code says
An accessory unit is allowed in MU-CC, MU-DC, MU-TC, MU-NC and MFR, and in R-1 and R-2 with a Planning Board special use permit. The owner must live in one of the two units. MU-1, MU-2, C-1, I-1 and LC take no accessory unit.
Conditions the code attaches:
- The accessory unit may not exceed 40% of the area of the main house.
- It may be inside the house or in an accessory building, one per single-family home.
- An in-law apartment inside an existing house, with its own kitchen and a family member living in it, is allowed in MU-CC, MU-DC, MU-TC, MU-NC, R-1, R-2 and MFR.
- A new single-family house is not a listed use in MU-CC or MU-DC.
- MU-1 allows a two-family house by special use permit instead.
- The building department can be reached at (518) 233-2127.
How big an ADU can be in Cohoes
Size limits are set per district, and a unit inside the house is a different standard from a detached one. These are the figures the code publishes.
40% of the principal dwelling
What the Cohoes 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 |
|---|---|---|---|---|
| Office/Retail Commercial | 0.23 ac | 0 / 10 / 20 ft | 35 ft | No |
| Form-Based Code Boundary | — | — | — | — |
| Floodplain District (FD) | — | — | — | — |
| Historic Overlay District (HD) | — | — | — | — |
| Industrial | 0.23 ac | 20 / 20 / 20 ft | 45 ft | No |
| Land Conservation | 1 ac | 75 / 50 / 50 ft | 35 ft | No |
| Residential-Multi-Family | 0.23 ac | 5 / 10 / 20 ft | 35 ft | Occupancy restricted |
| Mixed-Use | 0.046 ac | 0 / 0 / 0 ft | 55 ft | No |
| Waterfront Mixed-Use | 0.12 ac | 0 / 0 / 0 ft | 45 ft | No |
| Mixed Use Civic Core | — | - / 0 / 5 ft | 45 ft | Occupancy restricted |
| Mixed Use Downtown Core | — | - / 0 / 5 ft | 45 ft | Occupancy restricted |
| Mixed-Use Neighborhood Corridor (MU-NC) | — | 0 / 0 / 10 ft | 36 ft | Occupancy restricted |
| Mixed-Use Transit Corridor (MU-TC) | — | - / 0 / 0 ft | 35 ft | Occupancy restricted |
| Planned Unit Development District (PDD) | — | — | — | — |
| Residential - 1 | 0.23 ac | 30 / 12 / 20 ft | 35 ft | Occupancy restricted |
| Residential - 2 | 0.17 ac | 5 / 10 / 20 ft | 35 ft | Occupancy restricted |
Office/Retail Commercial - The front setback is a range of 0 to 10 ft rather than the single figure shown. Schedule B publishes no residential row for this district: office, retail, cultural, indoor recreation and mixed-use structures all share these figures.
- Consult Schedule B, the schedule of area and bulk regulations at 285 Attachment 2, directly for any other use.
Form-Based Code Boundary - Chapter 285 names four form-based districts, and this is not one of them. No dimensional standard is published for it.
- It appears to mark the outer boundary the Regulating Plan Map (§ 285-167) draws around those four districts, rather than a district regulated on its own.
- The four form-based districts are named and defined at § 285-166 through § 285-171.
Floodplain District (FD) - In the FEMA-mapped flood hazard area this district controls how a structure is built rather than where it sits: elevation, floodproofing, anchoring and utility placement. It carries no lot size, setback, coverage or height standard of its own.
- The flood hazard construction standards are set out at § 285-45.
Historic Overlay District (HD) - This overlay adds design and appearance review of designated historic sites and districts. It carries no lot size, setback, coverage or height standard of its own and layers on top of whatever base district underlies the parcel.
- The review requirement is set out at § 285-44.
Industrial - The figures shown are the general industrial row, shared by a contractor's yard, light industry, a machine shop, manufacturing and a warehouse. Schedule B varies standards use by use, so another use here can carry different figures.
- A single-family dwelling is reachable only by special use permit, on 70 ft of width with a 30 ft front yard and 12 ft side yards.
- Consult Schedule B, the schedule of area and bulk regulations at 285 Attachment 2, directly for any use outside that group.
Land Conservation - The figures shown are the base row for a farm, greenhouse, hydroponics or municipal utility. A natural preserve or a commercial stable needs 10 acres against this 1 acre, with the same setbacks, and takes a special use permit.
- At least 80% of the lot must be left as green space, a floor that sits alongside the building coverage cap shown.
- Consult Schedule B, the schedule of area and bulk regulations at 285 Attachment 2, directly for any other use.
Residential-Multi-Family - These figures are the multifamily case. A single-family house needs less land here, not more: 0.115 acre on a 50 ft wide lot, with 5 ft side yards and up to 60% coverage.
- A two-family needs 0.138 acre on 60 ft of width, with 5 ft side yards and up to 70% coverage.
- An attached or row house needs 0.172 acre on 50 ft of width, with 5 ft side yards and up to 80% coverage.
- The front setback is a range, 5 to 15 ft.
- Many other uses carry their own rows in the area and bulk schedule, so standards for anything other than a home are worth checking there.
Mixed-Use - The 0 ft front, side and rear setbacks, the 100% coverage and the 55 ft height are the commercial and office case. A two-family drops out of that form: 0.172 acre, 50 ft of width, 10 ft side and 20 ft rear yards, and 35 ft of height.
- The front setback is a range, 0 to 5 ft.
- A single-family house needs 0.115 acre on 25 ft of width.
- An attached or row house, or a multifamily building, needs 0.057 acre on 25 ft of width.
- Many other uses carry their own rows in the area and bulk schedule, so standards for anything other than a home are worth checking there.
Waterfront Mixed-Use - The 0 ft front, side and rear setbacks, the 100% coverage and the 45 ft height are the retail, office and restaurant case. A single-family house takes its own standards: 0.184 acre, 80 ft of width and 10 ft front, side and rear yards.
- The front setback is a range, 0 to 10 ft.
- A multifamily building needs 0.23 acre on 90 ft of width.
- Many other uses carry their own rows in the area and bulk schedule, so standards for anything other than a home are worth checking there.
Mixed Use Civic Core - Front and side-street placement works as a build-to zone, 0 ft minimum and 5 ft maximum, so a building has to sit close to the street rather than merely behind a line. Height carries a 22 ft minimum as well as the 45 ft cap.
- The interior side property line takes a 0 ft minimum with no maximum.
- The 45 ft height cap is 4 stories.
- The ground floor must be in office or retail use.
- The district standards are set out at § 285-168.
Mixed Use Downtown Core - Front and side-street placement works as a build-to zone, 0 ft minimum and 5 ft maximum, so a building has to sit close to the street rather than merely behind a line. Height carries a 35 ft minimum as well as the 45 ft cap.
- The interior side property line takes a 0 ft minimum.
- The 45 ft height cap is 4 stories.
- The district standards are set out at § 285-169.
Mixed-Use Neighborhood Corridor (MU-NC) - Front and interior side placement works as a build-to zone, 0 ft minimum and 20 ft maximum, and the side-street build-to zone runs from 0 to 10 ft. Height carries a 15 ft minimum as well as the 36 ft cap.
- The 36 ft height cap is 3 stories.
- The district standards are set out at § 285-171.
Mixed-Use Transit Corridor (MU-TC) - Front, side-street and interior side placement all work as a build-to zone, 0 ft minimum and 10 ft maximum, so a building has to sit close to the line rather than merely behind it. Height carries a 15 ft minimum as well as the 35 ft cap.
- The 35 ft height cap is 3 stories.
- The district standards are set out at § 285-170.
Planned Unit Development District (PDD) - The Common Council approves a planned unit development case by case against a comprehensive development plan, largely independent of the land use regulations otherwise applicable to the property. The approved plan for the tract is the only source of dimensions.
- The district is set out at § 285-43.
Residential - 1 - At least 50% of the lot must be left as green space, a separate floor from the building coverage cap shown. Congregate housing takes the same figures as a single-family house.
- The 35 ft height cap applies to by-right uses; a public use is capped at 10 ft.
- Consult Schedule B, the schedule of area and bulk regulations at 285 Attachment 2, directly for any other use.
Residential - 2 - The front setback is published as a range of 5 to 10 ft, and at least 50% of the lot must be left as green space on top of the building coverage cap.
- Single-family, two-family and attached or row houses all take the same 7,500 sq ft lot and 50 ft width.
- Consult Schedule B, the schedule of area and bulk regulations at 285 Attachment 2, directly for any other use.
ADUs vs. short-term rentals in Cohoes
Short-term rentals allowed with local rules for City of Cohoes. Renting a home short term in Cohoes requires an annual permit from Code Enforcement, and short term rental operation is restricted to the mixed-use districts. The permit is $150 a year. 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 minimum0.17–0.23 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityNational Grid territory.
- Zoning codeecode360.com/CO0376
- Building dept(518) 233-2127
ADU FAQ — Cohoes, NY
Are ADUs allowed in Cohoes, NY?
City of Cohoes has 16 districts. 7 districts allow ADUs with occupancy restrictions, 5 do not. 4 districts have incomplete data - verify with the building department at (518) 233-2127. Check your address with the free ADU checker.
Do I need a special permit for an ADU in Cohoes?
No district in City of Cohoes requires a special-use permit for an ADU - 7 districts allow ADUs with occupancy restrictions, 5 do not. Site-plan review or a building permit may still apply.
Can I use an ADU as a short-term rental in Cohoes?
Short-term rentals allowed with local rules for City of Cohoes. 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.
What an ADU costs to build in Cohoes
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $195k–260k 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 Cohoes, priced by size.
How we know this
- Districts confirmed
- 12 of 16 — 4 not yet analyzed, so this page does not answer for them.
- Last reviewed
- 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 Cohoes: Full zoning for new construction · ADU build cost · House build cost · ADU rules across Albany County · All Albany County towns
ADU information for City of Cohoes is compiled from the municipal code (last reviewed 2026-09-19) 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 (518) 233-2127 before relying on any answer. Source: the Offsite / Aldo zoning dataset.