Since April 1, 2026, a Chicago building with one to four legal units can add a conversion unit and a coach house, without a zoning change, on lots where the program applies. On paper, a Ukrainian Village two-flat could become a four-unit property. The building stock fits the idea well. The city's report on one extension of the Ukrainian Village Landmark District counted 188 two- or three-flats among its 232 buildings.
The ordinance's own rules, though, push most owners toward a smaller plan. Construction costs, an affordability trigger on the second unit, and the landmark district's design review all favor adding one garden-level unit. A buyer underwriting a two-flat here should price the first ADU and treat the second as a separate decision with different economics.
The first gate is the legal unit count
Everything depends on what the city recognizes as already there. The ADU allowance is calculated from existing legal dwelling units. To add a conversion unit, the principal building must be at least 20 years old. Most of the neighborhood's prewar masonry stock clears that easily. The unit count is the harder question. A developer who presented at a Chicago Association of REALTORS® session, covered in a September 1, 2026 recap, described checking historical maps and filing records requests with the city's water department to confirm a building's true unit count. In one case the research showed a property was legally a four-unit building, though the seller had believed for 35 years that it was not.
That matters because the allowance steps up with unit count. One to four legal units allows one conversion unit and one coach house. Five to seven allows two conversion units and one coach house. After the unit count, the eligibility checks run in this order:
- Zoning on the specific lot. ADUs are allowed by right in RT and RM districts and in certain business and commercial districts. An RS-zoned lot qualifies only inside a mapped ADU-allowed RS area.
- Pilot history. Ukrainian Village was outside the 2021 West pilot zone, whose boundaries ran along the Eisenhower Expressway, Homan, Cermak, the South Branch of the Chicago River and 4600 West. RS-zoned lots here have no pilot status to fall back on.
- Ward opt-ins and block caps. The December 2025 RS-area legislation lists 1st Ward Ald. Daniel La Spata and 26th Ward Ald. Jessica Fuentes as co-sponsors. Where RS areas are opted in, the city caps annual pre-certifications at one per block in RS-1, two in RS-2 and three in RS-3, and some areas carry a $500 administrative adjustment.
- Pre-certification, then permits. The Department of Housing's pre-certification does not authorize construction. Department of Buildings permits and inspections still follow.
The city points every applicant to its address-level eligibility map. Two buildings on the same Ukrainian Village street can get different answers.
The cost gap between the two allowed units
Once a lot qualifies, the two allowed ADU types cost very different amounts. The figures below come from that same summer 2026 presentation. They are one practitioner's project estimates, not citywide averages.
| ADU type | Estimated cost | Main cost drivers |
|---|---|---|
| Garden-level conversion | $145,000 to $170,000 | Excavation and foundation, $50,000 to $60,000; new water, sewer and electrical service, $40,000 to $50,000; interior build-out, $50,000 to $60,000 |
| Attic or top-floor conversion | $80,000 to $100,000 or more | Roof and utility work |
| Coach house | $400,000 to $600,000, with one recent project above $700,000 | New detached structure |
The coach house also has a labor rule the conversion unit does not. The owner must commit the general contractor and every subcontractor to Registered Apprenticeship Programs approved by the U.S. Department of Labor. The developer said every coach house in his presentation was built to house a family member rather than a tenant. "They're not financially viable as investments," he said. He also said only about 10% of the properties he evaluates still make sense once he tests them against higher costs, lower rent and higher vacancy. He plans for 9 to 12 months from permit submission to a finished unit.
Neither unit type can be used for short-term rental. Short-term leases are barred in conversion units and in coach houses built after 2021, and neither type requires added parking. Both units are long-term rentals, and the coach house costs roughly three times as much to build.
The second unit comes with a 30-year rent cap
The affordability rule is what most changes the math on the second unit. Adding one ADU carries no affordability requirement. Once an owner adds two or more, in any mix of conversion units and coach houses, half of the new units, rounded down, must be restricted for 30 years to tenants at or below 60% of Area Median Income. The owner chooses which unit is restricted. The restricted unit must be registered with the Department of Housing for a $500 fee. The owner files an annual compliance affidavit and records a covenant with the Cook County Clerk.
On a two-flat, rounding down means the first ADU is unrestricted and the second triggers the covenant. The city's 2026 tables put the caps in dollars. The comparison figures below are citywide. No current one- or two-bedroom rent figure specific to Ukrainian Village turned up in the sources reviewed.
| Unit size | City's 60% AMI gross rent cap, 2026 | Apartment List citywide median rent, Sept. 29, 2026 | RentCafe citywide average, Sept. 30, 2026 |
|---|---|---|---|
| One-bedroom | $1,367 | $1,759 | $2,457 |
| Two-bedroom | $1,641 | $1,915 | $3,329 |
The city's caps are gross rents, which assume the landlord pays all utilities. Even against Apartment List's citywide median as of September 29, 2026, the one-bedroom cap sits $392 a month lower and the two-bedroom cap $274 lower. RentCafe's figures, updated September 30, 2026, come from Yardi Matrix data on buildings with 50 or more apartments. That is a different product from a garden unit in a two-flat, so its larger gaps don't transfer directly.
Put the pieces together. An owner adding both units would spend a coach-house budget of $400,000 or more on top of a garden conversion, and one of the two units would then rent under a cap for three decades. A capped two-bedroom grosses at most $1,641 a month, or $19,692 a year, before the landlord pays its utilities, at 2026 limits. The owner can choose which unit carries the cap, but one of them must. A single unrestricted garden unit avoids the covenant entirely.
Landmark review shapes what can be seen from the street
The Ukrainian Village District was designated December 4, 2002, and the city's listing singles out its stock of two- and three-flats. Permit applications for work in designated districts go through landmark review. Reviewers assess whether the proposal would harm the district's significant historic or architectural features. No source found for this post exempts ADU work from that review.
The September 10, 2026 agenda of the Commission on Chicago Landmarks' Permit Review Committee shows how this works on an ADU. At 1530 N. Hoyne in the neighboring Wicker Park District, an owner proposed adding a second-floor ADU to an existing coach house, with a new visible dormer and entrance door. Staff recommended approval with conditions, including this one:
The proposed fiber cement siding to be installed on the new dormer should be painted the color of the roofing material to further minimize visibility.
The same agenda included a rehabilitation in the Old Town Triangle District with a new below-grade entrance door and access stair. That is the kind of exterior change a garden unit often needs. Attic units face their own fixed rules here. The city's dormer policy for 1½-story masonry cottages in the Ukrainian Village District and Extension, adopted January 5, 2005, sets these requirements:
- a setback of at least one-third of the building's length
- a ridge at least one foot below the main ridge
- compatible materials
- a maximum length of six feet
- no more than two dormers per side
Review doesn't mean refusal. The Hoyne recommendation approved the dormer's size, massing and location as drawn. Review does add time, drawings and conditions, and a visible new structure in a rear yard draws more of all three than a garden unit tucked mostly below grade.
One more data point runs the other way. The Permit Review Committee's March 6, 2025 agenda listed 2019 W. Cortez in the Ukrainian Village District, where an owner proposed turning a four-unit building into a two-unit building, with side additions and a new rear garage. Since the ADU allowance is calculated from legal units, a deconversion lowers the count that any future ADU application would start from.
Common questions
Can I add a coach house and a garden unit to the same two-flat? Yes, if the lot is eligible. A building with one to four legal units may add one of each. Adding both triggers the affordability covenant on one of them.
How much demand has the program seen? Before the expansion, the Department of Housing had pre-certified 816 ADUs as of March 18, about 85% of them on the North or Northwest Side. Chicago Cityscape reported 188 applications within two days of the April 2026 launch. That is an application count, not permits issued.
Does a pre-certification mean my landmark approval is handled? No. Pre-certification comes before the Department of Buildings permit, and landmark permit review applies to work in designated districts.
If you're weighing a Ukrainian Village two-flat partly on its ADU potential, Joe Kotoch Group will check the legal unit count, the lot's eligibility and the cost of a garden unit before you write an offer. Start a Strategic Conversation with our team.
