Accessory Dwelling Unit Permit - Des Moines Guide

Housing and Building Standards Iowa 3 Minutes Read ยท published February 10, 2026 Flag of Iowa

Des Moines, Iowa homeowners who want to add an Accessory Dwelling Unit (ADU) must follow local zoning and building permit rules before construction or rental. This guide explains the typical permit path in Des Moines, identifies the enforcing departments, summarizes application steps, and points to official municipal resources so you can prepare drawings, pay fees, and schedule inspections.

Start early: preliminary zoning review can prevent costly redesigns.

Overview

An ADU is a secondary dwelling on a single-family lot. Local rules cover where ADUs are allowed, size limits, parking, owner-occupancy requirements, and construction standards. Confirm zoning allowances and required permits with the City of Des Moines Planning and Permits & Inspections offices [1][2].

How to Apply

  1. Confirm zoning and ADU eligibility with Planning; request a zoning verification or pre-application meeting.
  2. Prepare site plan, floor plans, and elevations consistent with local code and submit a building permit application.
  3. Pay application and permit fees as required by the Building Permits office.
  4. Schedule inspections during construction through Permits & Inspections; obtain final approval and certificate of occupancy before renting.

Penalties & Enforcement

Enforcement is managed by the City of Des Moines Permits & Inspections and Code Enforcement divisions; complaints and inspection requests go through their official contact pages [2]. Specific monetary fines, escalation amounts, and per-day penalties for constructing or occupying an ADU without required permits are not specified on the cited pages.

  • Fines: not specified on the cited page; consult the enforcement contact for current penalty schedules.
  • Escalation: first offence, repeat and continuing violations are handled per administrative citation procedures and may include increased fines or court action; amounts not specified on the cited page.
  • Non-monetary sanctions: stop-work orders, required mitigation or removal, withholding of certificate of occupancy, and possible court enforcement.
  • Enforcer: Permits & Inspections / Code Enforcement; submit complaints or request inspections via the official city contacts [2].
  • Appeals: administrative review or appeal to the appropriate city board or hearing officer; specific time limits for appeals are not specified on the cited pages.
You must stop work if a stop-work order is issued until the issue is resolved with Permits & Inspections.

Applications & Forms

The usual forms include a building permit application, required plan sets, and any zoning/variance requests. The city publishes permit application instructions and submission methods on the Permits & Inspections page; fee schedules and form names or numbers are available there or by contacting the office directly [2]. If a specialized ADU application form exists, it will be listed on the Planning or Permits page.

Common Violations

  • Construction without a building permit.
  • Occupancy or rental of ADU without final certificate of occupancy.
  • Failure to meet required setbacks, maximum unit size, or parking requirements.
Keep permit documents on-site until final inspection is complete.

FAQ

Do I need a permit to build an ADU in Des Moines?
Yes. A building permit and zoning confirmation are normally required before construction or conversion.
How long does permitting usually take?
Timing varies with project complexity and review queues; contact Planning and Permits & Inspections for current processing times [2].
Are there size or parking limits for ADUs?
Size, parking, and owner-occupancy rules depend on zoning; consult the Planning office for parcel-specific rules [1].

How-To

  1. Verify zoning and ADU eligibility with Planning and request a pre-application review.
  2. Assemble plans: site plan, floor plans, elevations, and utilities information for submission.
  3. Submit the building permit application with required documents and pay fees.
  4. Complete required inspections and obtain final approval and certificate of occupancy before renting.

Key Takeaways

  • Start with a zoning check to avoid redesigns.
  • Permit review and inspections are mandatory before occupancy.
  • Contact Permits & Inspections or Planning early for application details.

Help and Support / Resources

  1. [1] City of Des Moines Planning Division - ADU and zoning information
  2. [2] City of Des Moines Permits & Inspections - building permits, inspections and enforcement

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