An ADU builder in Minneapolis is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Minneapolis's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in Minnesota.
What ADU Builders Cost in Minneapolis [11][12][13]
Based on our Minneapolis cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.
| New Detached ADU (all-in) | $150,000-$465,000 |
| Cost per Sq Ft | $180-$550 |
| Garage Conversion | $95,000-$185,000 |
| Prefab / Modular ADU (installed) | $150,000-$350,000 |
| City Permit & Plan Review | $325 zoning application, plus a valuation-based building permit: about $3,200-$5,400 on $150,000-$300,000 of work (permit fee + 65% plan-review fee + 0.05% state surcharge, 2026 schedule). Plumbing, mechanical and electrical permits are separate. |
| Impact Fees | No city impact fee: the building permit fee schedule lists only the permit fee, 65% plan review and the 0.05% state surcharge. A Metropolitan Council sewer availability charge (SAC) may apply to a new dwelling unit; confirm the current rate with Development Review. |
For a full line-item breakdown, see our Minneapolis ADU cost guide. To confirm what you're allowed to build before you hire, review the Minneapolis ADU rules (max detached size: 1,300 sq ft gross floor area on all levels (garage space counts) or 16% of lot area, whichever is greater; never more than 1,600 sq ft or larger than the main house. Separately, the combined footprint of the ADU, every other detached accessory building and any attached garage is capped at 800 sq ft or 10% of lot area, whichever is greater (550.1460(2)-(3)).; owner-occupancy: Required only for an internal ADU that is not a separate dwelling unit under the State Building Code: the owner must live in one of the units and record a covenant with Hennepin County before the building permit issues; this cannot be varied (550.1440(5), 525 variance limits). Not required for attached or detached ADUs since March 6, 2021; older covenants stay until released after inspection (550.1450(5), 550.1460(11)).).
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How to Vet an ADU Builder in Minneapolis
- License: Confirm a current contractor's license in Minnesota and that it's in good standing. Ask for the license number and verify it with the state board.
- ADU-specific experience: Ask how many ADUs they've completed in or near Minneapolis and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
- Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
- Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
- Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits ($325 zoning application, plus a valuation-based building permit: about $3,200-$5,400 on $150,000-$300,000 of work (permit fee + 65% plan-review fee + 0.05% state surcharge, 2026 schedule). Plumbing, mechanical and electrical permits are separate.), plan check (15 business days for the initial review, 5 business days for each resubmittal (city permit application process page)), and impact fees (No city impact fee: the building permit fee schedule lists only the permit fee, 65% plan review and the 0.05% state surcharge. A Metropolitan Council sewer availability charge (SAC) may apply to a new dwelling unit; confirm the current rate with Development Review.) are included.
- Permit handling: Confirm they manage Minneapolis's permit process ("Administrative ADU application to Zoning ($325), decided by the zoning administrator without a hearing (appeal to the Board of Adjustment within 10 days), then a building permit through Minneapolis Development Review in ProjectDox; an internal ADU records its owner-occupancy covenant before the permit issues (550.1410; application packet rev. July 2024).", typically City target: 15 business days for the initial building-plan review and 5 business days per resubmittal; zoning staff send any incompleteness letter within 15 business days. No end-to-end time is published.) and who is responsible if revisions are required.
- Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.
Questions to Ask Before You Hire
- How many ADUs have you built in Minneapolis in the last two years?
- Is your bid fixed-price, and what would trigger a change order?
- Are permits, plan check, and utility connection fees included?
- What's a realistic timeline, including permit review (City target: 15 business days for the initial building-plan review and 5 business days per resubmittal; zoning staff send any incompleteness letter within 15 business days. No end-to-end time is published.) and construction?
- Who is my point of contact and how are delays communicated?
- What warranty do you provide on workmanship?
- Can you share three recent Minnesota ADU client references?
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