Can I Build Second Story Addition in Des Moines, IA? (2026)
Find out if you can build a second story addition in Des Moines, IA. Rules, permit requirements, costs, and next steps.
Adding a second story in Des Moines, IA is possible in most zones, subject to height limits and structural permit requirements.
A second story addition is one of the most complex home improvement projects in Des Moines, IA. It requires a full building permit, structural engineering review, and must comply with the height limits for your zoning district. Unlike a ground-floor addition, a second story changes the roofline and structural load path of your entire home, triggering stricter engineering requirements. In Des Moines, zone height limits range from varies feet in R1-60 zones — verify your zone before planning.
Second Story Addition Rules in Des Moines
Second Story Addition Rules in Des Moines: Building permit required: Yes — all second story additions require a permit. Example height limit (R1-60): varies feet. Structural engineering drawings required. Setbacks apply to the full structure height.
Costs & Fees
Contact the local building department for current permit fees. Budget separately for structural engineering.
Next Steps
Next steps for adding a second story in Des Moines: 1. Hire a structural engineer to assess your existing foundation and framing capacity. 2. Confirm your zone height limit and verify the addition meets all setback requirements. 3. Submit full structural plans and permit application to the local building department. 4. Inspections required at foundation reinforcement, framing, shear panels, and final.
Des Moines Permit and Development Center
Phone: (515) 283-4200 · Verified July 6, 2026 · Source
Website: https://www.dsm.city/departments/development_services/permit_development_center/
Online Permits: https://www.dsm.city/departments/development_services/permit_development_center/
Frequently Asked Questions
Can I build an ADU (garage apartment or in-law suite) in Des Moines?
Yes. Des Moines's Zoning Ordinance (Chapter 134) allows ADUs in residential zones. Detached ADUs up to 900 sqft are permitted in rear yards. No owner-occupancy is required. One parking space is required per ADU. Des Moines has some of the lowest ADU permitting costs among major US cities — no impact fees and affordable plan review fees. Contact the Permit and Development Center at (515) 283-4200.
What is the Sherman Hill Historic District and how does it affect permits?
Sherman Hill is a Victorian-era residential neighborhood immediately west of the Iowa State Capitol — one of the best-preserved late 19th-century neighborhoods in Iowa. If your home is in the Sherman Hill Historic District, exterior changes (including additions, siding replacements, window changes, and ADU construction visible from the street) require a Certificate of Appropriateness from the Des Moines Historic Preservation Commission before you can obtain a building permit. Interior changes do not require historic review. Contact the Des Moines Community Development Department at (515) 283-4182.
Does MidAmerican Energy offer incentives for residential solar in Des Moines?
MidAmerican Energy (a Berkshire Hathaway Energy company) provides net metering for residential solar systems. Iowa does not have a state solar mandate, but MidAmerican has committed to 100% renewable energy for its customers — making them generally cooperative with solar interconnection. A Des Moines building permit and MidAmerican interconnection agreement are required before installing grid-tied solar. Contact MidAmerican Energy's Renewable Energy department or a licensed Iowa solar contractor.
What are the flood risks for Des Moines properties?
Des Moines has significant flood history — the 1993 and 2008 floods were catastrophic, covering portions of downtown and west Des Moines. Properties along the Des Moines River and Raccoon River corridors may be in FEMA-designated Special Flood Hazard Areas (SFHA) requiring flood insurance and elevated construction standards. Use FEMA's Flood Map Service Center (msc.fema.gov) to check your property's flood zone. Des Moines Water Works manages the water supply, and the city has invested in flood control infrastructure since 1993.
What permits do I need for a deck or fence in Des Moines?
Fences under 6 ft in side and rear yards do not require a permit. Fences in front yards or over 6 ft require a permit from the Des Moines Permit Center ($40-$150). All elevated decks (30+ inches from grade) require a building permit. Deck permits cost $75-$400 depending on size. Both can be applied for online at dsm.city. Inspections are required for deck construction.
Source: Des Moines Permit and Development Center — Building Regulations. Last verified April 6, 2026. View source