Deck Building Grimes, Iowa
Grimes charges a flat $75 for a deck permit, and it wants one before anyone builds or alters a deck. The city publishes its own deck guidelines, from footing depth to stair handrails. This page walks through those rules and the zoning limits that decide where a Grimes deck can sit.
- Grimes at a glance
The Grimes numbers behind a deck plan
Grimes had 834 residents in 1970 and 15,392 at the 2020 Census. Seven in ten homes are lived in by their owners. The last four tiles come straight from the city’s deck guidelines and zoning code.
17,405
2025 Census Bureau estimate
834 to 15,392
Residents, 1970 to 2020
$304,700
Median owner-occupied home value
2024 IRC
Code in force since Dec. 2025
$75
Flat Grimes deck permit fee
42 inches
Minimum footing depth below grade
5 feet
Side and rear setback
50%
Rear yard impervious cap
Sources: U.S. Census Bureau QuickFacts (2020 Census, July 2025 estimate, ACS 2020 to 2024); State Data Center of Iowa (1970); Grimes Code, Title 11 building regulations; Grimes deck permit guidelines; Grimes zoning regulations.
- Permits and rules
What Grimes checks before and after a deck goes up
Yes, you need one. Grimes requires a permit before anyone builds or alters a deck. Its guidelines define a deck as an unroofed platform attached to the ground beside the house. Development Services reviews a sketch plan, then inspects twice. Here is what the city spells out.
Permit and plan sketch
Apply through Development Services at 410 SE Main St, Suite 102, or by email. The city’s checklist wants the deck drawn with dimensions and stairs, distances to the side and rear lot lines, and height above average grade. It also asks for footing spots and diameters, post, beam and joist sizes, joist span and spacing, the decking type and the guard design.
Two inspections, a day's notice
Grimes inspects the footings, then the finished deck. Call Development Services at 515-986-4050 at least 24 hours ahead. Have the contractor name, a contact and phone number, the address and the inspection type ready. The fee schedule charges $100 an hour for inspections outside normal business hours.
Holes, posts and the ledger
Footing holes reach at least 42 inches below grade, and posts sit in the concrete or on approved connectors. Grimes wants a ledger board no smaller than 2×8 fastened straight to the band joist, with the wall cladding removed behind it. Flash and seal that joint. Half-inch lags or bolts with washers go in as a pair at every 16 inches on center.
Guards, stairs and handrails
A guard is required once any point within 36 inches of the deck edge stands 30 inches or more above grade. It must reach 36 inches, with gaps a 4-inch ball cannot pass. Stair risers top out at 7 3/4 inches, including the last step to grade, and treads run at least 10 inches. Four or more risers call for a handrail set 34 to 38 inches high.
Where the deck can sit
Decks count as accessory structures in the Grimes zoning code, so they keep at least 5 feet from side and rear lot lines. In a front yard the setback grows to 15 feet, and the deck may reach no more than 8 feet out from the house. Put a permanent roof on it, and it must meet the house’s own setbacks instead.
Easements and yard coverage
A Grimes deck may not sit over or block an easement recorded with the county. The zoning code also counts decks as impervious surface, and a rear yard can be no more than half impervious. Patios, sheds and pools count toward that limit too, so measure everything already in the yard before you size the deck.
- Our process
How Busy Builders builds your Grimes deck
We draw the plan sheet Grimes asks for, with every footing, span and setback marked, and submit it to Development Services. Before we dig, we check the plat for easements and add up the rear yard’s hard surfaces against the 50 percent cap. Footings go to 42 inches and wait for the city’s first inspection.
Busy Builders is a registered Iowa contractor, DIAL C140184, and has finished more than 1,285 projects across Central Iowa since 2020. We build in composite and in pressure-treated wood. A homeowner whose composite deck we built in spring 2026 singled out our communication in a review.
- Plan sheet drawn to the city checklist
- Easement and yard coverage checked first
- Footing and final inspections booked for you
From sketch plan to final
- Achievement
Trusted Deck Builders in Grimes
Since 2020, Busy Builders has completed more than 1,285 construction and remodeling projects across Central Iowa.
- Frequently Asked Questions
FAQs About Deck Building in Grimes
How much does a deck cost in Grimes?
We do not publish a deck price range, because size, height, stairs, guard style and decking material move the number more than anything else. A raised deck needs more posts and longer stairs than one near grade. We measure, check your lot’s setbacks and easements, and give you a written estimate. The Grimes permit itself is a flat $75.
Is a small, low deck exempt from a permit in Grimes?
No. The city’s deck guidelines say a permit is required before the construction or alteration of any deck, and they list no size or height cutoff. The zoning code repeats it: no deck may be built without a deck permit from the Building Official. The fee is the same $75 either way.
How far from the property line can my deck be in Grimes?
At least 5 feet from side and rear lot lines, because Grimes treats decks as accessory structures. A deck in the front yard needs 15 feet and can project no more than 8 feet from the house. A secondary front yard on a corner lot takes 10 feet. A roofed deck must meet the house setbacks instead.
Does my deck count against the Grimes yard coverage limit?
Yes. Grimes lists decks in its definition of impervious surface, alongside concrete, pavers, pools and buildings. No more than 50 percent of a rear yard, and no more than 30 percent of front and side yards, can be impervious. If your backyard already has a large patio, we run the math before sizing the deck.
When does a Grimes deck need a guard or handrail?
A guard is required when any point within 36 inches of the edge sits 30 inches or more above grade. Stairs with four or more risers need a handrail, set 34 to 38 inches above the nosing line. On a deck 30 inches or more above grade, handrail openings must stop a 4 3/8 inch ball.
How long does a Grimes deck permit stay valid?
Under the city’s 2024 code amendments, a permit becomes invalid if work does not start within 90 days of issuance. It also lapses if work stops for 90 days once started. Reissuing or transferring a permit costs $250, so we set the build date before we apply.
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