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2026 Cost Guide · Updated September 2026

ADU Cost in Minnesota — Minneapolis, St. Paul, Rochester & Statewide

Minneapolis ranks among the nation's most ADU-friendly cities, and St. Paul removed its owner-occupancy requirement in 2023. City-by-city cost data across Minneapolis, St. Paul, and Rochester — built from permit records, contractor data, and regional labor rates.

$125K–$300KTwin Cities ADU range
$65K–$160KGarage conversion (lowest cost)
HUD FY2026Adopted rent benchmark
No state lawRules set city-by-city

MINNESOTA
ADU Collection

Beautiful. Functional. Built for Minnesota Living.

🏠Increase Property Value
💲Generate Rental Income
👥Multi-Generational Living
🌿Sustainable Design
Minnesota ADU front elevation
Minnesota Detached ADU
Minnesota Garage Conversion ADU
Minnesota Attached ADU
Minnesota Basement Conversion ADU
Minnesota Modular Prefab ADU
Minnesota ADU kitchen interior
Minnesota ADU living room interior
Minnesota ADU bedroom interior
Minnesota ADU bathroom interior
Minnesota ADU outdoor living and patio space
Planning & Inspiration
Planning Reference
Example 1-bedroom ADU floor plan, illustrative layout
Example Floor Plan

Illustrative 1-bedroom layout. Actual floor plans vary by ADU type, size, local code, and homeowner needs.

Minnesota ADU exterior at twilight, warm interior light glowing
Minnesota ADU and main house evening backyard view
Aerial view of Minnesota property with backyard ADU
Homeowners reviewing ADU permit documents
Permits & Fees

What permitting actually costs.

No statewide ADU siting mandate is in effect. Local ordinances—including Minneapolis and other city rules—control. The detailed figures below are representative planning ranges, not a statewide fee schedule or review-time guarantee.

📄
Building Permit Fee — Minneapolis
$1,800 – $3,000
Review timeline runs 40–60 days.
🏗️
Building Permit Fee — St. Paul
$1,900 – $3,200
Plus impact fees of $400–$800; review runs 45–65 days.
💧
Utility Connection Fees
$10,000 – $30,000
Running new utility lines from the street or main house for a detached unit.
🧾
Rental License (where required)
Separate from construction permit
Most Minnesota cities require a rental license once tenants move in.
⏱️
Permit Review Timeline
6 – 9 weeks
Varies by city.
Verified September 16, 2026 · Local control
Local rules control

No statewide ADU siting mandate is in effect. Local ordinances—including Minneapolis and other city rules—control.

Legal classificationLocal control
Governing frameworkLocal rules control
Representative permit fees$1,900 – $3,200
Representative review time6 – 9 weeks
Local verificationRequired

Source: NationwideADU 51-jurisdiction law directory →

Verify the property before design

These are planning benchmarks, not a permit quote, eligibility ruling, or legal opinion. Confirm zoning, building, utility, site, private-covenant, fee, and timing requirements with the current local authorities. See the 51-jurisdiction law directory and national permit guide.

ADU Types

Which type fits your property?

01 / Most Common
Detached ADU
$140K – $280K

Freestanding backyard structure. Minneapolis allows detached ADUs up to 1,300 sq ft or 16% of lot area (whichever greater), capped at 1,600 sq ft or the primary dwelling's size, whichever is less.

Detached ADU Guide →
02 / Most Affordable
Garage Conversion
$65K – $160K

Uses an existing structure to cut cost significantly versus new detached construction while generating similar rental income in most Minnesota markets.

Garage Conversion Guide →
03 / Fastest Build
Modular / Prefab
$100K – $230K

Factory-built construction offers a faster, more predictable timeline, with less exposure to Minnesota's harsh winter construction season.

Prefab ADU Overview →
04 / No Added Parking
Attached ADU
$120K – $250K

Shares one wall with the primary residence. Minneapolis requires no minimum off-street parking for ADUs, a major site-planning advantage on urban lots.

Attached ADU Guide →
05 / Common Statewide
Basement Conversion
$60K – $150K

Basement apartments are a well-established option across Minnesota, subject to Minnesota State Building Code fire separation and egress requirements.

Basement ADU Guide →
Cost by Region

Every Minnesota market is different.

Minneapolis / Hennepin County
Up to 3 units per lot in many zones
$140K–$280K
$180–$320 per sq ft
Highest cost
St. Paul / Ramsey County
Ordinance 23-43 (2023)
$135K–$270K
$130–$270 per sq ft
Moderate
Rochester / Olmsted County
Mayo Clinic corridor
$120K–$240K
$150–$250 per sq ft
Moderate
Cost Factors

Why Minnesota ADUs cost what they cost.

🏛️
Minneapolis's Progressive Zoning
Minneapolis allows up to three dwelling units per lot in many zones, requires no owner-occupancy and no off-street parking for ADUs — among the most permissive frameworks in the country.
Among most ADU-friendly nationally
🏛️
St. Paul's Ordinance 23-43
St. Paul's 2023 ordinance removed the owner-occupancy requirement and expanded detached size limits to 1,000 sq ft, and allows up to two ADUs per one-family lot.
Owner-occupancy removed in 2023
🏥
Mayo Clinic Rental Demand
Rochester's Mayo Clinic campus concentrates strong, recurring rental demand from medical staff and visiting families, supporting steady ADU occupancy.
Drives Rochester demand
⚖️
Current ADU Legal Framework
No statewide ADU siting mandate is in effect. A 2025 state law gives ADU-friendly cities bonus points on competitive housing grants — an incentive, not a requirement. Local ordinances, including Minneapolis and other city rules, control.
Local control · Local rules control
At a Glance

Minnesota ADU costs — by type.

Detached ADU
$140K – $280K
Minneapolis allows up to 1,600 sq ft
🏡
Attached ADU
$120K – $250K
No parking required in Minneapolis
🔗
Garage Conversion
$65K – $160K
Most affordable; uses existing structure
🚗
Basement Conversion
$60K – $150K
Common statewide; fire separation required
⬇️
Modular / Prefab
$100K – $230K
Fastest new-construction timeline
📦
💡

Local control: Local rules control. No statewide ADU siting mandate is in effect. Local ordinances—including Minneapolis and other city rules—control. Permit fees and review timing remain planning estimates until confirmed for the specific property.

Calculate My ROI →
Return on Investment

Minnesota ROI planning inputs.

$850–$1,300
Adopted statewide 1-bedroom rent range
15%
National property-value planning input
10%–20%
Property-value uncertainty range
30%
Operating-expense planning reserve
Rent source
HUD FY2026 revised
One-bedroom FMR market basket
Exact HUD mappings
ROI-CM-1.4
Home-value source
Statewide Zillow ZHVI
June 30, 2026
One statewide input
Not a valuation
Payback period
Calculated live
Budget, ADU type, size and rent
Open calculator →
No static statewide promise
Full methodology
Transparent sources
HUD, Census PUMS, Zillow and FHFA
Review methodology →
Planning estimate, not a valuation
Save Money

7 ways to cut your
Minnesota ADU cost now.

Minnesota is already one of the more affordable states to build in — these moves push savings further and prevent the most common costly mistakes.

Calculate My ADU ROI →
Compact detached ADU exterior
🏡
Compact Detached ADU
Minnesota — statewide range
Property-Value Planning Input
15%
1
Convert before you build new
If your property has a qualifying garage or basement, start there — conversions cost significantly less than detached new construction while generating similar rental income.
Saves substantially vs. new construction
2
Build in Minneapolis or St. Paul for the most flexibility
Neither city requires owner-occupancy, meaning both the primary home and ADU can be rented independently — a real advantage for investors over more restrictive Minnesota cities.
Enables dual rental income
3
Budget for utility line extensions early
Detached ADUs require their own water and sewer connections per Minnesota State Plumbing Code — running new lines can add $10,000–$30,000 depending on lot depth.
Prevents late-stage budget surprises
4
Get a minimum of three contractor bids
Contractor pricing for ADU projects in Minnesota varies significantly for equivalent scope. Getting three bids from ADU-experienced contractors is the most reliable way to avoid overpaying.
Prevents overpaying for the same scope
5
Ask about pre-approved plans in St. Paul
St. Paul offers pre-approved ADU plans that can save $3,000–$10,000 in design costs and 2–3 months in review time compared to a fully custom design.
Can save $3,000–$10,000 and months of review
6
Build with winter timelines in mind
Minnesota's harsh winters compress the practical construction window. Starting design and permitting in fall positions you to break ground as soon as weather allows in spring.
Avoids weather-driven schedule slippage
7
Secure landlord insurance before placing tenants
Standard homeowner's policies typically exclude landlord liability and rental income coverage once you rent an ADU. Confirming a landlord policy before your first tenant moves in avoids a coverage gap.
Avoids a costly insurance coverage gap
Frequently Asked Questions

Minnesota ADU answers.

How much does an ADU cost in Minnesota?
ADU costs in Minnesota typically range from $125,000 to $300,000 in the Twin Cities, depending on unit type. Garage conversions run lower, often $65,000–$160,000.
Is Minneapolis one of the most ADU-friendly cities in the country?
Yes. Minneapolis allows up to three dwelling units per lot in many zones, imposes no owner-occupancy requirement, and requires no additional off-street parking for ADUs — one of the most permissive frameworks nationally.
Does Minnesota have a statewide ADU law?
NationwideADU's September 16, 2026 review classifies Minnesota as local control; no statewide ADU siting mandate is in effect. Local ordinances — including Minneapolis and other city rules — control. A 2025 state law (Chapter 32 / SF 2298, effective May 24, 2025) gives cities a scoring incentive rather than a mandate: jurisdictions that allow ADUs, duplexes, or townhomes on at least 50% of their single-family-zoned land can earn bonus points on competitive Minnesota Housing Finance Agency capital grants, through December 31, 2029. Local zoning, building, utility, site, and private-covenant requirements may still apply; verify the current rules for the property before design or construction.
What does Minnesota's 2025 housing law (Chapter 32) do for ADUs?
Chapter 32 of 2025 (SF 2298), signed May 23, 2025 and effective the next day, directs the Minnesota Housing Finance Agency to award bonus scoring points — up to 5% of available points — on competitive capital-development programs to jurisdictions that permit duplexes, ADUs, or townhomes on at least 50% of their single-family-zoned land. It is a grant-scoring incentive, not a requirement that any city allow ADUs, and the provision is set to expire December 31, 2029.
How long does it take to get an ADU permit in Minnesota?
The representative ADU permit-review planning timeline for Minnesota is 6 – 9 weeks. This is not a statewide deadline or guarantee. Timing can change with the local authority, project complexity, corrections, utilities, site conditions, and application completeness; confirm the current timeline locally.
What is the cheapest ADU to build in Minnesota?
Garage conversions are generally the least expensive option, typically $65,000–$160,000, using an existing structure to significantly cut cost versus new detached construction.
How much are ADU permit fees in Minnesota?
The representative ADU permit-fee planning range for Minnesota is $1,900 – $3,200. This is not an official statewide fee schedule or quote. Plan review, utility, impact, site, and other local charges may be additional; request a current itemized estimate from the permitting authority.
What is the ROI on an ADU in Minnesota?
The adopted Minnesota one-bedroom planning range is $850–$1,300 per month, derived from the HUD FY2026 revised FMR market basket under ROI-CM-1.4. Payback is calculated from the homeowner's budget, ADU type, size, rent range, and a 30% operating-expense reserve. Property value uses a 15% national planning input with a 10%–20% uncertainty range; it is not a valuation.

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Planning Disclaimer: Cost, fee, and timeline ranges are approximations for education and early planning; actual requirements and costs vary with the property, local authority, utilities, site conditions, design, and contractor. The Minnesota legal classification and framework shown here were verified on September 16, 2026, but they do not determine parcel eligibility and are not legal advice. Confirm current zoning, building, utility, private-covenant, fee, and timing requirements directly with the applicable authorities before design or construction. Obtain at least three contractor bids before committing to a project budget. Last updated September 2026.