Rochester does not yet allow accessory dwelling units: the 2003 Zoning Code (Chapter 120) has no ADU use, and §120-163.A(1)(g) permits only a rear-yard guesthouse or servants' quarters with no kitchen that may not be rented. The Zoning Alignment Project's final draft code (April 2026) would legalise one ADU per single-family lot - up to 800 sq ft, one bedroom, 15 ft tall if newly built, owner-occupied (Sec. 3.7.A) - by right in the MDR and HDR districts and by City Planning Commission special permit in LDR. The Planning Commission took its recommendation vote on July 13, 2026; City Council had not adopted the code as of September 20, 2026. Until it does, the only legal second unit is a two-family dwelling in R-2 or R-3, and converting a house needs a 6,000 sq ft lot under §120-166.
Zoning & Size Requirements [1][2][3][4][5][6][7]
Not yet — Rochester does not currently allow ADUs in most residential areas. Rochester's current Zoning Code (Chapter 120, 2003) has no ADU use: §120-163.A(1)(g) allows only a rear-yard guesthouse or servants' quarters with no kitchen and no rental, and §120-10 bars adding a unit in R-1. The Zoning Alignment Project code (final draft April 2026) would add ADUs - 800 sq ft, one bedroom, owner-occupied; by right in MDR/HDR and mixed-use districts, by City Planning Commission special permit in LDR - but City Council had not adopted it as of September 20, 2026.
| Allowed Zones | None today: Chapter 120 (2003) lists no ADU use in any district; R-1 permits only single-family homes (§120-8) and bars adding units (§120-10); the only accessory living space is a rear-yard guesthouse/servants' quarters with no kitchen and no rental (§120-163.A(1)(g)). The April 2026 ZAP final draft (Table 3-1) would allow ADUs by right in MDR, HDR, BMU, NMU, FMU, DMU, RC, PMV and HV and by special permit in LDR - not adopted as of Sept 20, 2026. |
| Max Size (Detached) | Not applicable today. Proposed (ZAP final draft Sec. 3.7.A.7): 800 sq ft maximum, not exceeding the gross floor area of the main house; one bedroom at most (3.7.A.6); a detached unit must sit in the rear yard (3.7.A.5) and district lot-coverage limits still apply. |
| Max Size (Attached) | Not applicable today. Proposed: the same 800 sq ft, one-bedroom cap; an attached ADU must share at least 25% of its wall, floor or ceiling area with the main house (Sec. 3.7.A.4) and may not extend past the existing front building line (3.7.A.10). |
| Max Size (JADU) | No JADU category in Rochester's code or in the proposed ZAP code. |
| Max Height | Not applicable today (a detached accessory structure in R-1 is capped at 15 ft, §120-12.A). Proposed: a newly built ADU is limited to 15 ft or the height of the main house, whichever is less (Sec. 3.7.A.8); a converted existing garage is not 'newly constructed' (FGEIS p. 26). |
| Max Units | None today. Proposed: one ADU per lot, only with a single-family detached house (Sec. 3.7.A.1); the ADU cannot be sold separately from the lot (3.7.A.2) and gets no separate City water or sewer service (3.7.A.3). |
Setback Requirements [1][2][3][4][5][6][7]
Because Rochester does not yet permit ADUs, there are no ADU-specific setback or parking standards; the accessory-structure rules below are what a future unit would start from. Owner-occupancy is set by local rules (confirm with the city).
| Rear Setback | Not applicable today. Proposed: the draft sets no zoning setback for ADUs - 'all setbacks for the ADU shall be governed by the NYS Building and Uniform Fire Prevention Code' (Sec. 3.7.A.9); a detached ADU must be in the rear yard (3.7.A.5). |
| Side Setback | Not applicable today. Proposed: governed by the NYS Uniform Code, not by a zoning distance (Sec. 3.7.A.9); the generic 3 ft accessory-structure setback in Sec. 14.1.F applies only to structures the Building Code does not regulate. |
| Front Setback | Not applicable today. Proposed: an attached ADU may not extend past the existing front building line (Sec. 3.7.A.10); a detached ADU is confined to the rear yard (3.7.A.5). |
| Parking Required | Not applicable today (§120-173 requires 1 space per dwelling unit for single- and two-family homes). Proposed: Table 15-1 lists no ADU parking requirement - spaces are calculated on the principal use, 1 space for a single-family house (Sec. 15.3) - and an ADU may not have its own driveway (Sec. 3.7.A.12). |
| Owner Occupancy | Not applicable today. Proposed: required - the ADU definition (Sec. 3.9) says the owner must live in either the main house or the ADU, and because it sits in the definition it cannot be waived by special permit or use variance; proof is a utility bill or account statement at permit or C of O (FGEIS p. 26). |
| Min Lot Size | None proposed for ADUs. Today an R-1 detached house needs a 5,000 sq ft lot (§120-11.B) and a two-family conversion needs a 6,000 sq ft lot (§120-166.A(3)). |
Permit Process & Fees [8]
Rochester cannot issue an ADU permit under current zoning. The fees and timelines below are the general building-permit terms that would apply if the rules change.
| Approval Process | No ADU permit exists today; a two-family conversion in R-2/R-3 goes through the Bureau of Zoning and Permitting (certificate of zoning compliance, §120-189, plus a building permit), with Zoning Board of Appeals relief for any §120-166 shortfall. Under the proposed code an ADU needs a certificate of zoning compliance and a building permit; a detached ADU also needs site plan review (Sec. 20.5) and any ADU in LDR a City Planning Commission special permit with a public hearing (Sec. 20.11). |
| Review Timeline | Not published. Under the proposed code a special permit decision is due within 62 days after the Planning Commission closes its public hearing (Sec. 20.11.D.3); building-permit review times are not posted. |
| Permit Fees | Building-permit fees: the schedule was not retrievable (cityofrochester.gov is bot-walled) - confirm with the Bureau of Zoning and Permitting. Zoning fees in §120-206.1 (as amended 2010): special permit $250, use/area variance $250, certificate of zoning compliance $50. |
| Impact Fees | None - Chapter 120 and the proposed code contain no development impact fee, and New York has no impact-fee enabling statute. Water and sewer connection charges are billed separately. |
| Plan Check | Not published; part of the building-permit review by the Bureau of Zoning and Permitting. |
| Pre-Approved Plans | None - Rochester publishes no pre-approved ADU plan set (Sept 2026). |
Get Free ADU Quotes in Rochester
Tell us about your project and we'll pass it to ADU builders serving Rochester. Free, no obligation — you choose who to work with. We don't have builders in every area yet; if nobody covers yours, we'll email you to say so.
Takes about a minute.
Up to 5 independent local ADU builders — never more, and we tell them nothing you don't submit here.
Compare quotes, verify license & insurance, hire (or don't). No spam either way.
🔒 Your info is secure. We share it only with contractors quoting your project. No spam, no obligation.
Just browsing? Search ADU builders near you by ZIP code.
Construction Costs [9][10]
If ADUs become legal in Rochester, building one would run roughly $105,000-$210,000 ($125-$250 per sq ft) at today's regional rates; a garage conversion about $50,000-$120,000.
See what this means for your lot — ask Rochester ADU builders for a quote →
| Average Build Cost | $105,000-$210,000 |
| Cost per Sq Ft | $125-$250 |
| Garage Conversion | $50,000-$120,000 |
| Prefab ADU (Installed) | $75,000-$170,000 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more
Rental Income Potential [11][12]
A 2-bedroom unit in Rochester would rent for around $1,250-$1,600/mo at current market rates — a hypothetical figure while ADUs are not yet permitted.
| Avg Rent (1 Bedroom) | $1,000-$1,300/mo |
| Avg Rent (2 Bedroom) | $1,250-$1,600/mo |
| Short-Term Rental | Not addressed for ADUs; a separate ZAP short-term rental amendment (April 2026 draft, not adopted) would regulate STRs by district and owner-occupancy |
| Est. Annual ROI | Not estimated - no ADU can be permitted today; HUD FY2026 FMR $1,256/mo (1-BR) for the Rochester MSA against a $105,000-$210,000 build |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more
Recent Law Changes
What's Changed Recently
- 2026-09-20 re-verification: the current Zoning Code (Chapter 120, eCode360 copy archived February 2026) still contains no ADU use; §120-163.A(1)(g) allows only a rear-yard guesthouse or servants' quarters with no kitchen and no rental. The old 35 ft height, 15/5/20 ft setbacks, 50-70 day timeline, $1,900-$3,300 fee and $400-$900 impact-fee figures were removed as unsourced; rents re-based on HUD FY2026 Fair Market Rents
- Zoning Alignment Project: final draft Zoning Code, Zoning Map and FGEIS released April 20, 2026 (ADU cap raised from 400 to 800 sq ft; LDR changed from prohibited to special permit; new-build height cut from 24 ft to 15 ft). City Planning Commission informational meetings June 8 and 10, comment deadline June 18, recommendation vote July 13, 2026. City Council adoption still pending as of September 20, 2026
- New York State: A6778/S10217, the 'ADU Incentive Act' (a forgivable-loan program, not a mandate), was re-referred to the Assembly Housing Committee on January 7, 2026; New York still has no statewide ADU law and ADUs remain a municipal home-rule matter
- New York State's Plus One ADU grant program funds units only through local administrators in participating municipalities; check NYS Homes and Community Renewal's program page for a Rochester-area administrator before counting on it
Tips for Building an ADU in Rochester
- Cost basis: the four cost ranges carry over from the February 2026 industry citations (Angi) and were not refreshed in September 2026 (source bot-walled); rents are re-based on HUD FY2026 Fair Market Rents for the Rochester, NY MSA ($1,256 1-BR, $1,573 2-BR), and city-of-Rochester rents usually sit below the metro figure.
- Today's legal route to a second unit is a two-family dwelling in R-2 or R-3 (§120-17, §120-26); converting an existing house needs a 6,000 sq ft lot, 1,500 sq ft of habitable floor area, at least 650 sq ft for a one-bedroom unit and one parking space per unit (§120-166, §120-173), or an area variance from the Zoning Board of Appeals.
- A garage apartment is not a loophole: the guesthouse or servants' quarters allowed in the rear yard under §120-163.A(1)(g) may have no kitchen and may not be rented or used as a permanent dwelling.
- If the ZAP code is adopted as drafted, look up your proposed district on the City's draft zoning map: LDR lots need a City Planning Commission special permit with a public hearing; MDR and HDR lots get an ADU by right, subject to district lot-coverage limits and the 800 sq ft, one-bedroom cap.
- Owner-occupancy under the proposed code is written into the ADU definition, not the standards, so it cannot be waived; if the house is sold to an owner who will not live on site, an attached ADU must be absorbed into the house and a detached one demolished or legalised as another use (FGEIS p. 26).
- Follow adoption at rochesterzap.com (the City's project site) and cityofrochester.gov/ZAP; the proposed code keys several rules to 'the effective date of this Code' (e.g. Sec. 15.3.B.2), which City Council sets when it adopts.
ADU Builders in Rochester
Looking for an ADU builder in Rochester? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Rochester homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- City of Rochester Code, Chapter 120 Zoning (2003 code, in force) - eCode360 Municipal Code — Accessed 2026-09-20
- Chapter 120, Article III R-1 Low-Density Residential District (§§120-7 to 120-15) - eCode360 Municipal Code — Accessed 2026-09-20
- Chapter 120, Article XX Requirements Applying to All Districts (§120-163 accessory uses; §120-166 dwelling unit conversions; §120-173 parking) - eCode360 Municipal Code — Accessed 2026-09-20
- Zoning Alignment Project - Final Draft Zoning Code, April 2026 (Table 3-1; Sec. 3.7.A ADU standards; Sec. 3.9 definition; Art. 14; Sec. 15.3; Sec. 20.11) Planning Department — Accessed 2026-09-20
- Zoning Alignment Project - Final Generic Environmental Impact Statement, April 2026 (ADU section pp. 25-27) Planning Department — Accessed 2026-09-20
- Rochester Zoning Alignment Project - Updates (City project site) Planning Department — Accessed 2026-09-20
- Bureau of Zoning and Permitting - City of Rochester Planning Department — Accessed 2026-06-28
- Chapter 120, §120-206.1 Fee schedule (zoning application fees) - eCode360 fee_schedule — Accessed 2026-09-20
- Angi - ADU Construction Cost Data industry — Accessed 2026-02-24
- Angi - Local ADU Contractor Costs industry — Accessed 2026-02-24
- HUD FY2026 Fair Market Rents - Rochester, NY MSA Government Data — Accessed 2026-09-20
- Zoning Alignment Project - Final Draft Short-Term Rental Code Amendment, April 2026 Planning Department — Accessed 2026-09-20
- Zoning Alignment Project (ZAP) - City of Rochester Planning Department — Accessed 2026-09-20
- NY Assembly Bill A06778 (2025-26) - Accessory Dwelling Unit Incentive Act - summary and actions Government Data — Accessed 2026-09-20
Frequently Asked Questions
Can I build an ADU in Rochester?
How much does an ADU cost in Rochester?
How much can I rent an ADU for in Rochester?
Do I need parking for an ADU in Rochester?
How long does it take to get an ADU permit in Rochester?
Ready to Build in Rochester?
Get free, no-obligation quotes from top-rated ADU contractors in Rochester.
Get Free Quotes →Build ADUs in Rochester?
Homeowners read this page while planning, then ask us to connect them with a local builder. We pass those requests to builders who cover Rochester — a flat fee only on the leads you accept, no subscription, and you contract directly with the homeowner.
See who's waiting in New York →