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
| Allowed Zones | Residential zones |
| Max Size (Detached) | 1,000 sq ft |
| Max Size (Attached) | 850 sq ft |
| Max Size (JADU) | 750 sq ft |
| Max Height | 35 feet |
| Max Units | 2 units per lot (duplex + ADU) |
Setback Requirements
| Rear Setback | 12 feet |
| Side Setback | 3 feet |
| Front Setback | 15 feet |
| Parking Required | 1 space (optional) |
| Owner Occupancy | Not required |
| Min Lot Size | 4,000 sq ft |
Permit Process & Fees
| Approval Process | Building permit with streamlined review |
| 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
| 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 (installed) |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders in minutes.
Compare ADU Financing Options →Rental Income Potential
| 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. Compare top prefab manufacturers.
Compare Prefab ADUs →Recent Law Changes
What's Changed Recently
- 2024: Expanded duplex + ADU allowance
- 2023: Streamlined permitting process
- 2024: Eliminated parking requirements
- 2023: Created ADU design guidelines
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
Frequently Asked Questions
Can I build an ADU in Saint Paul?
Yes. ADUs are allowed in Residential zones in Saint Paul. The maximum size for a detached ADU is 1,000 sq ft. No owner-occupancy is required.
How much does an ADU cost in Saint Paul?
ADU construction in Saint Paul typically costs $135,000-$270,000. Garage conversions run $65,000-$155,000, and prefab ADUs cost $95,000-$220,000 (installed).
How much can I rent an ADU for in Saint Paul?
Average ADU rents in Saint Paul are $1,300-$1,750/mo for a 1-bedroom and $1,650-$2,300/mo for a 2-bedroom unit.
Do I need parking for an ADU in Saint Paul?
1 space (optional). Check with Saint Paul planning department for the latest Minnesota ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Saint Paul?
The permit review timeline in Saint Paul is 45-65 days. Fees range from $1,900-$3,200.
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