Zonloty

Can you build a duplex in St. Paul, MN?

Allowed with site-plan review

RT2 and multifamily districts allow small multifamily forms, but lots under 9,000 square feet cannot host new three-plus-unit multifamily under the provided dimensional summary, and site plan review may apply depending on unit count and project type.

Confidence: medium · Last researched May 2026

Dimensional standards in St. Paul, MN

RL — minimum lot area21,780 square feet — Larger lot may be required depending on sewage treatment system needs.
RL — minimum front setback30 feet — May be adjusted by blockface averaging rule where at least 50 percent of front footage is built up with principal structures.
RL — minimum side setback10 feet
RL — minimum rear setback25 feet
R1 — minimum lot area9,600 square feet — Where over half of the lot has slopes of twelve percent or greater, minimum lot size shall be 15,000 square feet.
R1 — minimum front setback30 feet — May be adjusted by blockface averaging rule.
R1 — minimum side setback10 feet
R1 — minimum rear setback25 feet
R2 — minimum lot area7,200 square feet
R2 — minimum front setback25 feet — May be adjusted by blockface averaging rule.
R2 — minimum side setback8 feet
R2 — minimum rear setback25 feet
R3 — minimum lot area6,000 square feet
R3 — minimum front setback25 feet — May be adjusted by blockface averaging rule.
R3 — minimum side setback6 feet
R3 — minimum rear setback25 feet
R4 — minimum lot area5,000 square feet — These standards apply when one-family dwellings are erected in less restrictive residential districts.
R4 — minimum front setback25 feet — May be adjusted by blockface averaging rule.
R4 — minimum side setback4 feet
R4 — minimum rear setback25 feet
RT1 — minimum lot area3,000 square feet — RT1 standards apply when two-family dwellings are erected in less restrictive residential districts.
RT1 — minimum front setback25 feet — May be adjusted by blockface averaging rule.
RT1 — minimum side setback9 feet
RT1 — minimum rear setback25 feet
RT2 — minimum lot area2,500 square feet — Applies to entire parcel where townhouse lots are individually described with common land.
RT2 — minimum front setback25 feet — May be adjusted by blockface averaging rule.
RT2 — minimum side setback9 feet
RT2 — minimum rear setback25 feet
RM1 — minimum lot area per unit2,000 square feet — No multifamily dwelling with three or more units on a lot less than 9,000 square feet.
RM1 — minimum front setback25 feet — May be adjusted by blockface averaging rule.

Related questions

Are ADUs allowed in St. Paul, MN?

ADUs are secondary dwelling units associated with a principal one-family dwelling and may be within, attached to, or detached from that dwelling on the same zoning lot.

What are the setback requirements in St. Paul, MN?

Setbacks vary by district. Examples — RL minimum front setback: 30 feet (conditions apply); RL minimum side setback: 10 feet; RL minimum rear setback: 25 feet; R1 minimum front setback: 30 feet (conditions apply). Always confirm the exact yard requirements for your district with St. Paul, MN.

What is the minimum lot size in St. Paul, MN?

Minimum lot size depends on the zoning district — RL minimum lot area: 21,780 square feet (conditions apply); R1 minimum lot area: 9,600 square feet (conditions apply); R2 minimum lot area: 7,200 square feet; R3 minimum lot area: 6,000 square feet.

Full investor analysis

The full St. Paul, MN report breaks down duplex and 2–4 unit feasibility by district, the approval path, and the density/dimensional limits that decide whether the numbers work. First town report is free.

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More about St. Paul, MN zoning

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This summary is AI-generated from public municipal sources and is not legal, engineering, or land-use advice. Always verify zoning with St. Paul, MN officials before making decisions.

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