2026 Cost Guide · Updated June 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 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

At a Glance

Minnesota ADU costs — by type.

Detached ADU

$140K – $280K

Minneapolis allows up to 1,600 sq ft

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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

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💡

Local control: Local rules control. No broad statewide ADU siting mandate was identified. 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 →

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.

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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

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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

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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

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Current ADU Legal Framework

No broad statewide ADU siting mandate was identified. Local ordinances—including Minneapolis and other city rules—control.

Local control · Local rules control

Homeowners reviewing ADU permit documents

Permits & Fees

What permitting actually costs.

No broad statewide ADU siting mandate was identified. 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.

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Building Permit Fee — Minneapolis

$1,800 – $3,000

Review timeline runs 40–60 days.

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Building Permit Fee — St. Paul

$1,900 – $3,200

Plus impact fees of $400–$800; review runs 45–65 days.

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Utility Connection Fees

$10,000 – $30,000

Running new utility lines from the street or main house for a detached unit.

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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 August 5, 2026 · Local control

Local rules control

No broad statewide ADU siting mandate was identified. 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.

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 →

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Compact Detached ADU

Minnesota — statewide range

Property-Value Planning Input

15%

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

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

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

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

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

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

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. NationwideADU's August 5, 2026 review classifies Minnesota as local control; no broad statewide ADU siting mandate was identified.

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 August 5, 2026 review classifies Minnesota as local control; no broad statewide ADU siting mandate was identified. No broad statewide ADU siting mandate was identified. Local ordinances—including Minneapolis and other city rules—control. Local zoning, building, utility, site, and private-covenant requirements may still apply; verify the current rules for the property before design or construction.

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 August 5, 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 August 2026.