Saint Paul allows ADUs in most residential zones with streamlined approval processes. The city follows Minneapolis's lead on progressive housing policy, creating a favorable ADU development environment.
Zoning & Size Requirements [1]
Yes, you can build an ADU in Saint Paul. A detached ADU can be up to 800 sq ft under current Minnesota and Saint Paul zoning rules.
| Allowed Zones | All residential zones with one-family dwellings (citywide since 2018) |
| Max Size (Detached) | 800 sq ft or 75% of the principal dwelling floor area (whichever is greater) |
| Max Size (Attached) | 800 sq ft or 75% of the principal dwelling floor area (whichever is greater) |
| Max Size (JADU) | 800 sq ft or 75% of principal dwelling (internal ADU) |
| Max Height | 25 ft or height of principal structure (whichever less) for detached; district standard for attached |
| Max Units | 2 ADUs per one-family dwelling (at least 1 must be detached if both built) |
Setback Requirements [1]
Saint Paul requires a rear setback of about 3 ft for a detached ADU, and no additional parking is required. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | 3 ft from interior lot lines |
| Side Setback | 3 ft from interior lot lines |
| Front Setback | Must meet principal building front setback (ADUs placed in rear) |
| Parking Required | No additional parking required |
| Owner Occupancy | Not required (removed in 2022) |
| Min Lot Size | No minimum (lot size requirement removed in 2022) |
Permit Process & Fees [2]
An ADU permit in Saint Paul typically costs $1,900-$3,200 and takes 45-65 days, through a ministerial, by-right review.
| Approval Process | Building permit (by-right; zoning review + building permit) |
| Review Timeline | 45-65 days |
| Permit Fees | $1,900-$3,200 |
| Impact Fees | $400-$800 |
| Plan Check | 2-3 weeks |
| Pre-Approved Plans | Available |
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Construction Costs [3][4]
Building an ADU in Saint Paul typically costs $135,000-$270,000 ($130-$270 per sq ft); a garage conversion runs $65,000-$155,000.
| Average Build Cost | $135,000-$270,000 |
| Cost per Sq Ft | $130-$270 |
| Garage Conversion | $65,000-$155,000 |
| Prefab ADU (Installed) | $95,000-$220,000 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
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Rental Income Potential [5][6]
A 2-bedroom ADU in Saint Paul rents for around $1,650-$2,300/mo, an estimated 7-9% annual return.
| Avg Rent (1 Bedroom) | $1,300-$1,750/mo |
| Avg Rent (2 Bedroom) | $1,650-$2,300/mo |
| Short-Term Rental | Permitted with license |
| Est. Annual ROI | 7-9% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
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Recent Law Changes
What's Changed Recently
- Owner-occupancy requirement removed in 2022 — owner no longer needs to live on site to rent an ADU or the main house
- Up to 2 ADUs permitted per one-family dwelling; if two are built at least one must be detached (or both may be attached if 50%+ of the existing principal structure floor area is retained)
- Each ADU capped at 800 sq ft or 75% of the principal dwelling floor area (whichever is greater); detached ADU buildings limited to 25 ft height
- Lot-area minimum does not apply to ADUs; no additional parking required
- No statewide Minnesota ADU mandate — Saint Paul's rules are local
Tips for Building an ADU in Saint Paul
- Saint Paul follows Minneapolis's progressive policies
- Lower property costs than Minneapolis with similar ROI potential
- Capital city location provides economic stability
- Twin Cities market offers excellent investment fundamentals
ADU Builders in Saint Paul
Looking for an ADU builder in Saint Paul? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Saint Paul homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Accessory Dwelling Units — City of Saint Paul Planning Department — Accessed 2026-06-28
- Building Permits & Inspections — City of Saint Paul Planning Department — Accessed 2026-02-25
- Angi — ADU Construction Cost Data Market Data — Accessed 2026-02-24
- Angi — Local ADU Contractor Costs Market Data — Accessed 2026-02-24
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- Minnesota ADU Legislation (SF 4009) Government Data — Accessed 2026-02-24
Frequently Asked Questions
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How much can I rent an ADU for in Saint Paul?
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