What is the 2026 cost range for a junior adu (jadu) scope adu in Chicago?

$72,450-$152,950, with the median landing near $112,700. The range reflects finish tier and layout complexity within the junior adu (jadu) scope; the Chicago labor multiplier of 1.15× vs national median is baked in.

How long does a junior adu (jadu) scope adu take in Chicago?

10-18 weeks of on-site construction for the junior adu (jadu) scope, plus 6-14 weeks of permit review in Chicago if the scope requires a permit. Cosmetic-only refreshes often skip permits; anything touching plumbing, electrical, or structural does not.

What is the single biggest budget-overrun risk for this scope?

Owner-occupancy covenants in some jurisdictions limit resale financing options — buyer must also commit to occupancy, reducing resale pool.

ADU — Junior ADU (JADU) Cost in Chicago, 2026

Low

$72K

$72,450

Median

$113K

$112,700

High

$153K

$152,950

Scope timeline: 10-18 weeksChicago permit window: 6-14 weeksUpdated 2026-04-24

Why junior adu (jadu) × Chicago produces this band

A junior adu (jadu) scope for a adu in Chicago combines two price levers: scope and metro labor rates. JADUs carve a ≤500 SF unit out of the existing primary structure with an efficiency kitchen (no range, induction cooktop allowed) and a shared or private bath. Cheapest ADU class when the jurisdiction recognizes it. Against the national median remodel labor rate, Chicago runs 15% above the national median — so the junior adu (jadu) band comes in 65% below the mid-range, then scales 15% above the national median on top of that. Permit timelines for residential work in Chicago typically run 6-14 weeks, which is the window you plan your design and decision sequence against. This page gives you the actual 2026 Chicago bands for this exact combination, plus the three cost drivers Baily asks about first when scoping the project live.

What drives cost for a junior adu (jadu) scope

·Efficiency kitchen with limited plumbing (no garbage disposal in many jurisdictions)
·Independent entrance cut into an exterior wall
·Owner-occupancy covenant recording
·Shared utility metering (no new service drop)

What makes Chicago different

Labor — Union trades (carpentry, electrical, plumbing) are the majority of licensed remodel labor — premium over national median.
Labor — Winter shuts down most exterior trades Dec-Feb, compressing schedules into a 9-month season.
Labor — Chicago Prevailing Wage Ordinance drives labor costs on any publicly-touching work.
Material — Midwest steel and framing lumber are priced competitively vs coasts.
Material — Masonry restoration (common in pre-war Chicago brick) uses specialty materials with long lead times.

Chicago rules that affect this scope

Chicago DOB self-certification is available for registered architects — compresses permit timelines.
Landmark districts (e.g. Lincoln Park, Old Town Triangle) require Commission on Chicago Landmarks review in addition to DOB permit.
Chicago Energy Conservation Code (IECC 2021) applies to all work changing envelope or HVAC.
Two-flat and greystone conversions frequently trigger zoning variance — timeline extension of 8-14 weeks.

Scope your adu with Baily.

Baily asks the eight questions that determine where your project lands inside the $72K-$153K band for Chicago and hands the scoped brief to one licensed builder.

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Questions LA homeowners actually ask

$72,450-$152,950, with the median landing near $112,700. The range reflects finish tier and layout complexity within the junior adu (jadu) scope; the Chicago labor multiplier of 1.15× vs national median is baked in.