Published August 16, 2026
Adding one legal bedroom to a Twin Cities rental costs $12,000–$28,000 and returns $700–$1,100 per month in rent-by-the-room markets near the U of M, Dinkytown, Como, and the Midway.
That is a 14–30 month payback. Almost nothing else in real estate does that.
The per-room rent picture
| Submarket | Per-room rent (furnished, utilities included) |
|---|---|
| Dinkytown / Marcy-Holmes | $850–$1,150 |
| Como / Southeast Como | $750–$975 |
| Midway / Hamline | $650–$850 |
| St. Paul east metro | $600–$775 |
| Suburban single-family | $700–$900 |
What a conversion actually costs
| Conversion type | Cost | Notes |
|---|---|---|
| Divide an oversized bedroom | $6,000–$11,000 | Wall, door, egress usually already exists |
| Dining room to bedroom | $9,000–$15,000 | Wall + door + closet + window check |
| Den or office to bedroom | $8,000–$14,000 | Often already has a closet |
| Basement room + egress window | $18,000–$28,000 | Egress cut is the big line |
| Attic room + dormer | $35,000–$60,000 | Ceiling height and stair code drive it |
The rule that decides everything
A room only counts as a bedroom if it has:
- A code-compliant egress opening — 5.7 sq ft clear, sill under 44"
- A closet (market expectation in MN; not strictly code, but tenants and appraisers expect it)
- 7-foot minimum ceiling height
- Two means of escape from the sleeping area
- Interconnected smoke and CO detection
Worked example: a Como duplex
- Purchase: 4-bed / 2-bath duplex
- Convert oversized dining room in each unit: $22,000 total
- Result: 6 bedrooms
- Added rent: 2 rooms × $800 = $1,600/mo = $19,200/yr
- Payback: 13.75 months
- Added property value at a 7% cap: ~$274,000 in gross rent capitalization terms; realistically a $45,000–$70,000 appraised bump
Where investors get burned
- Converting without egress. A room without a legal window is not a bedroom. If a tenant is injured, your insurance carrier will find that out.
- Blocking the only dining space. In a family-rental submarket this can cut your tenant pool more than the extra bedroom gains.
- Occupancy limits. Minneapolis and St. Paul both cap unrelated occupants per dwelling. Check the current limit before you build to a room count you cannot legally fill.
- Rental license inspection. Both cities inspect on license renewal. Unpermitted bedrooms get flagged and ordered removed.
The fastest, cheapest win
If you own a 3-bedroom with a big unfinished basement and no egress, the single highest-return move in the metro right now is: cut one egress window, frame one bedroom, add a closet. Roughly $18,000–$24,000, and it converts a 3-bed into a 4-bed permanently.
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Frequently asked questions
How much does it cost to add a bedroom to a Twin Cities rental?
$6,000-$15,000 for an above-grade conversion using existing space, and $18,000-$28,000 for a basement bedroom that needs an egress window cut.
Does a bedroom conversion need a permit?
Yes. Framing, electrical, and any egress window cut all require permits in Minneapolis and St. Paul, and unpermitted bedrooms get flagged at rental license inspection.
What is the payback period on a bedroom conversion?
Typically 14-30 months in Twin Cities rent-by-the-room submarkets, based on $700-$1,100 per room per month.