Do I need a permit for a small shed in my backyard?

It depends on size and duration. A shed under 200 square feet that's not a dwelling unit is typically exempt in Des Moines if it sits on a concrete pad or gravel — no footings below frost. If you're building a shed with a permanent foundation, framing, and electrical service, or if it's over 200 square feet, you need a permit. If it's a temporary structure (under 180 days), exemption may apply — call the Building Department to confirm your specific scenario.

I'm replacing my water heater. Do I need a permit?

No, as long as you're reusing the same location, fuel type (gas or electric), and venting method. If you're moving the unit to a new location, changing fuel type, or installing a new gas line, you need a plumbing subpermit. Don't just assume — if you're unsure about the venting or gas line, one 5-minute phone call to the Building Department will save you a callback.

What's the frost depth in Des Moines and why does it matter?

42 inches. That's the depth below which soil doesn't freeze in a typical winter. Any footing — deck post, shed foundation, fence post, pool wall — must extend below 42 inches, or frost heave will lift it and crack it. It's not a guideline; it's an inspection point. Helical footings, concrete piers, and frost-protected shallow footings (FPSF) all work if you follow the manufacturer specs and get them inspected.

Can I pull a permit myself as a homeowner, or do I need a contractor?

You can pull a permit yourself for owner-occupied residential work. Iowa allows owner-builders. However, certain subpermits (electrical, plumbing) may require a licensed professional to sign off, depending on the scope. If you're hiring a licensed electrician, they typically file the electrical subpermit. If you're doing electrical work yourself, you pull the electrical subpermit, but the inspector will verify your work meets NEC 2017. Call the Building Department and describe your specific project — they'll tell you what you can do yourself and what requires a licensed trade.

How long does permit approval take in Des Moines?

Over-the-counter permits (fences, decks under 600 sq ft with simple plans) can be approved same-day or within 1–2 days. Plan review for larger projects runs 1–3 weeks, depending on complexity and whether the department requests revisions. Inspection scheduling usually happens within 3 business days of the department notifying you it's ready. Expect 4–6 weeks from application to occupancy for a typical addition or major renovation.

What happens if I build without a permit?

The city can issue a stop-work order and require you to tear out the unpermitted work or bring it into compliance retroactively. Fines for unpermitted work typically run $500–$1,500 per violation. When you sell the house, the title search may flag unpermitted work, scaring off buyers or tanking the sale price. Getting a retroactive permit is possible but expensive and time-consuming. The math almost always favors getting the permit upfront.

Do I need a permit to add a bathroom to my basement?

Yes. Adding a bathroom triggers a full building permit (not just a plumbing subpermit) because you're creating a new habitable space. You'll need egress windows if it's a bedroom, proper ventilation, electrical work, and plumbing. Budget 2–4 weeks for plan review. Fees run 1.5–2% of project valuation, typically $300–$800 for a modest bathroom.

What's the difference between a permit and an inspection?

A permit is the city's approval to do the work, issued after plan review. An inspection is the city's verification that the completed work meets code. You get a permit, you do the work, then you call for an inspection. The inspector either approves it or requires you to fix something. Most projects have 2–3 inspection points: footings/framing, rough-in (electrical/plumbing/HVAC), and final. Don't cover up or finish work before calling for the inspection — inspectors need to see the rough work.

I want to finish my basement with drywall and flooring but no new rooms. Do I need a permit?

If you're just adding drywall and flooring to existing walls and there are no new electrical circuits, HVAC ducts, or plumbing, you're likely exempt. However, if the basement is below grade and you're creating a bedroom, you'll need egress windows per IRC R310.1, which requires a permit. Safest move: take a photo of your basement layout and email the Building Department or call with the details. They'll tell you yes or no in 5 minutes.

Building Permits in Des Moines, IA (2026)

Do I need a permit in Des Moines, Iowa?

Des Moines sits in IECC Climate Zone 5A with a 42-inch frost depth — that matters for decks, foundations, and any work that goes into the ground. The City of Des Moines Building Department enforces the 2015 International Building Code (IBC) and the 2017 National Electrical Code (NEC), with Iowa state amendments layered on top. Most homeowners think permits are optional for small projects. They're wrong. Decks, fences, electrical upgrades, basement finishes, HVAC replacements — a lot of work that feels small actually requires a permit or at least a conversation with the city before you swing a hammer. The good news: Des Moines' permit office is straightforward. There's no byzantine approval process. Get in early, ask the right question, and you'll know exactly what you need in one call. The bad news: skipping a permit can tank a future sale, cost you in fines, and trigger a costly tear-out and redo. This page walks you through the landscape so you know which projects are genuinely exempt and which ones need a permit before you commit time and money.

What's specific to Des Moines permits

Des Moines adopted the 2015 International Building Code (IBC) with Iowa amendments. That's important because it sets the baseline for everything — setbacks, egress widths, frost depth, electrical clearances. The 42-inch frost depth is non-negotiable for any footing work: deck posts, sheds, detached garages, pools. IRC R403.1 requires footings to extend below the frost line, period. In Des Moines that means 42 inches minimum from grade. Most homeowners use helical or Powderfast frost-protected footings to save digging; the city accepts both if you follow the manufacturer specs and get them inspected.

Decks are the #1 permit question in Des Moines, and the rule is straightforward: any deck larger than 200 square feet or over 30 inches high requires a permit. That 30-inch threshold is the IRC R301.3 standard — it's the point where a platform becomes a deck and needs guardrails, footings below frost, and structural engineering. A 12x16 ground-level deck on pressure-treated joists that sits on blocks instead of proper footings? That's a common rejection. The city will require helical footings or concrete piers that go to 42 inches. Plan for that in your estimate.

Electrical work in Des Moines follows NEC 2017. Any new circuit, panel work, hardwired appliance, or anything above 15 amps typically needs a subpermit and an electrical inspection. Owner-builders can pull permits for owner-occupied residential work, but if you're hiring a licensed electrician, they usually file the subpermit — not you. Don't assume your general contractor will handle it. Call the Building Department and confirm who files before you start.

Fences in Des Moines require a permit if they're over 6 feet in height or if they're masonry/retaining walls over 4 feet. Corner-lot sight-triangle rules apply: setback restrictions limit fence height to 3 feet within 25 feet of the corner, per local zoning. Pool barriers always require a permit, even at 4 feet, because they're life-safety components. The permit is usually $100–$150 and includes one inspection. Plan check averages 1–2 weeks.

The Building Department does not offer full online filing as of this writing, but you can request permit information by phone or in person at Des Moines City Hall. Monday through Friday, 8 AM to 5 PM. Hours vary seasonally (spring/summer see longer hours for inspection scheduling), so call ahead to confirm. The department processes routine permits (fences, decks, small electrical) over-the-counter if your application is complete. Bring a legible site plan with property lines, dimensions, and setback information. That alone cuts approval time in half.

Most common Des Moines permit projects

These five projects account for the majority of permit applications in Des Moines. Each has specific local triggers and typical cost ranges.

Do I need a building permit
in Des Moines, IA?

Do I need a permit in Des Moines, Iowa?

What's specific to Des Moines permits

Most common Des Moines permit projects

Decks

Fences

Electrical work

HVAC

Room additions

Do I need a building permit in Des Moines, IA?

Do I need a permit in Des Moines, Iowa?

What's specific to Des Moines permits

Most common Des Moines permit projects

Decks

Fences

Electrical work

HVAC

Room additions

Do I need a building permit
in Des Moines, IA?