Building permits, zoning and septic rules in Austin, Minnesota

At a glance

Building permit

New-home application and approval through the city¹

Zoning

City zoning districts apply inside Austin²

Sewer and septic

Required sewer connection where applicable; county septic approval for private systems³⁴

Minimum lot size

R-1: 6,000 square feet; A-1: 200,000 square feet⁶⁷

Tiny homes

State residential code and Austin zoning both apply⁸

Owner-builder

Conditional state contractor-license exemption; building approvals still apply⁹

Who to call

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Do you need a building permit in Austin, MN?

For a new home in Austin, apply through the City Building Department and obtain the Building Official’s approval before starting work.¹ Minnesota’s State Building Code applies statewide to buildings of the types governed by the code, including construction, alterations and repairs.¹⁰ Austin’s new-home instructions require a site drainage plan for Engineering Department review and ask applicants to allow 15 working days for review of site drawings, plans and code compliance.¹ Ask the city building counter to identify the application and inspections for your particular addition, remodel or outbuilding.¹¹

Who handles building permits and zoning in Austin?

The City of Austin Building Department lists 507-437-9950 for building-permit information and questions.¹¹ For official verification of an Austin parcel’s zoning, call City Planning & Zoning at 507-437-9952.¹² Austin’s zoning districts are city-administered, so begin with the city when assessing a building site inside city limits.² Private sewage-system permitting remains a separate question for Mower County Environmental Services.⁴⁵ For land outside Austin city limits, use the Mower County guide for the county’s construction-or-placement zoning-permit requirement.¹³

Does Austin have zoning, lot-size rules and setbacks?

Austin has its own zoning districts, and dimensional requirements depend on the district rather than a single citywide lot standard.²¹⁴ In Austin’s R-1 Single-Family Residence District, the minimum lot area is 6,000 square feet and minimum lot width is 60 feet.⁶ In Austin’s A-1 Agricultural District, the minimum lot area is 200,000 square feet and minimum width is 200 feet.⁷ Austin’s R-1 district limits lot coverage to 40% and building height to 30 feet.¹⁵¹⁶ Before choosing a house footprint, ask City Planning & Zoning to verify the district and explain the parcel’s setback and overlay requirements.¹²¹⁴

How do sewer connections and septic permits work in Austin?

Austin requires buildings used for human occupancy and other covered purposes to connect to public sanitary sewer when the property abuts a street, alley or right-of-way where that sewer is located or may be located; installation is due within 90 days after official notice.³ Where public sewer is unavailable, Austin requires a private wastewater system complying with the City/County Sanitation Code.³ Mower County requires a septic construction permit before covered installation, alteration, repair or extension, subject to the ordinance’s exceptions.⁴ Contact Mower County Environmental Services for that process.⁵ The published construction fee is $550 for Type I, II and III residential systems within the stated flow limit; ask the county for the full fee schedule for your design.¹⁷

Can you live in an RV or tiny home on land in Austin?

We could not confirm Austin’s rules for living in an RV or camping temporarily on a private residential parcel; ask City Planning & Zoning about the proposed use before relying on it during construction.¹² Minnesota requires tiny houses used as dwellings to comply with the applicable residential code, while municipal zoning controls location, dimensions and other land-use details.⁸ We could not confirm Austin’s tiny-home occupancy or accessory-dwelling approval rules; take the proposed design and intended use to City Planning & Zoning.¹² Austin does allow manufactured homes outside licensed manufactured-home parks conditionally, including required approvals, area regulations and foundation footings at least 42 inches below finished grade.¹⁸

Building a home in Austin: what are the steps, in order?

1. Ask Austin Planning & Zoning to verify the parcel’s zoning and compare the proposed building with district requirements.¹²¹⁴ 2. Establish whether Austin’s sewer-connection requirement applies; if sewer is unavailable, resolve private wastewater-system approval with Mower County Environmental Services.³⁴⁵ 3. Prepare the new-home application materials, including the site drainage plan, and allow the city’s stated 15 working days for review.¹ 4. Obtain Building Official approval before starting construction and arrange the required final inspection before moving in.¹ An Austin owner-builder may qualify for Minnesota’s contractor-license exemption when occupying the home or retaining it for rental, but the exemption does not waive building approvals or inspections.⁹

What should you check before buying land in Austin?

Ask Austin Planning & Zoning to verify the parcel’s zoning before committing to a site or intended use.¹² Austin can disapprove subdivision development that violates the City Flood Plain Chapter.¹⁹ Minnesota also requires floodplain approval for covered construction or fill in regulated floodplain areas, and mapped floodways generally prohibit dwellings and enclosed structures.²⁰²¹ A private well generally requires state notification and a filing fee before construction, subject to statutory exceptions; we could not confirm an Austin-specific well provision.²² A direct driveway connection to a Minnesota state highway requires MnDOT approval before construction or modification.²³

Watch-outs

• Austin’s manufactured-home allowance has foundation and approval conditions; we could not confirm permission to occupy an RV on a private lot.¹⁸¹²
• Austin’s new-home final inspection must occur before the owner moves in.¹
• A sewer-served Austin parcel may be subject to mandatory connection rather than an elective private septic system.³

Sources

1. City of Austin Building Department — New Home Applications (ci.austin.mn.us)
2. § 11.020 Districts (Austin), quoted and re-checked
3. § 3.30 Rules and Regulations Relating to Sewer Use and Service Charge (Austin), quoted and re-checked
4. Mower County SSTS Ordinance, quoted and re-checked
5. Mower County Environmental Services (co.mower.mn.us)
6. § 11.023 District Regulations (Austin), quoted and re-checked
7. § 11.023 District Regulations (Austin), quoted and re-checked
8. Tiny Houses and the 2020 Minnesota Residential Code (Minnesota statewide rule), quoted and re-checked
9. revisor.mn.gov (Minnesota statewide rule), quoted and re-checked
10. 2025 Minnesota Statutes, section 326B.121 (Minnesota statewide rule), quoted and re-checked
11. City of Austin Building Department (ci.austin.mn.us)
12. City of Austin Planning & Zoning (ci.austin.mn.us)
13. Zoning and Land Use Permits (2026 county census)
14. § 11.020 Districts (Austin), quoted and re-checked
15. § 11.023 District Regulations (Austin), quoted and re-checked
16. § 11.023 District Regulations (Austin), quoted and re-checked
17. Septic Systems (Austin), quoted and re-checked
18. § 4.71 Manufactured (Mobile) Homes (Austin), quoted and re-checked
19. codelibrary.amlegal.com (Austin), quoted and re-checked
20. Floodplain Regulations (Minnesota statewide rule), quoted and re-checked
21. Floodplain Regulations (Minnesota statewide rule), quoted and re-checked
22. 2025 Minnesota Statutes, section 103I.205: Well Construction (Minnesota statewide rule), quoted and re-checked
23. MnDOT Access Management Manual, Chapter 4 (Minnesota statewide rule), quoted and re-checked

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.