Johnston, Iowa Building Permit Guide

The Johnston Building Department, at City Hall, 6221 Merle Hay Road (515-727-7778), issues building, electrical, plumbing and mechanical permits within Johnston. Completed applications go in by email, by mail or at the counter, and a typical review takes up to seven working days. Permits submitted from February 1, 2026 are built to the 2024 International codes with Johnston’s amendments, and the building fee follows a valuation table that starts at $30.

What requires a building permit in Johnston?

The Building Department’s list covers accessory buildings and structures, new and altered homes and commercial buildings, excavation, grading and demolition, monument, building and temporary signs, outdoor and seasonal sales events and other temporary uses, and all plumbing, mechanical and electrical work. The department notes that the list is not all-inclusive, so a project outside it is not automatically exempt.

What Johnston decides and what the state holds

Johnston writes its construction rules into its Code of Ordinances. From February 1, 2026 the city enforces the 2024 International Building, Residential, Mechanical, Fuel Gas, Existing Building and Fire Codes, the 2024 State of Iowa plumbing code and the 2023 State of Iowa electrical code, along with the 2015 International Property Maintenance Code and 2015 International Swimming Pool and Spa Code, all with local amendments. The building code is Chapter 155; plumbing amendments sit in Chapter 156 (Ordinance 1069), electrical in Chapter 157 (Ordinance 1067), mechanical in Chapter 158 (Ordinance 1070), fuel gas in Chapter 154 (Ordinance 1068), pools in Chapter 148 and property maintenance in Chapter 161. Zoning and subdivision rules were rewritten to match the Thrive 2040 comprehensive plan and took effect on May 1, 2023, together with new post-construction stormwater and erosion control requirements.

Johnston building department: who handles permitting

The Building Department, part of the city’s Community Development operation, issues permits, enforces the building codes and the city and state requirements behind them, and runs the rental inspection program. Adam Ostert is the Building Official. Floodplain questions also go to Community Development through the same main line.

The department is busy: its 2025 annual report counts 608 building permits and $108.6 million in new construction value, including 98 single-family homes, 47 townhome and twin home units, six new commercial buildings and 24 commercial additions or remodels.

Johnston permit types

Johnston uses a short set of forms. One building application covers decks, fences, basements, new homes, additions and other building work; there is a separate deck and pergola application, a single trade application for plumbing, mechanical and electrical work, a packet for new homes and a grinder tank permit. Guideline sheets explain what to submit for accessory buildings, basements, decks, fences, pools and hot tubs, and a generic wall section form helps homeowners show framing.

Residential permits

Every building permit needs a site plan showing adjacent street names, documented property lines and the dimensioned footprint of existing and proposed structures; the city does not locate lot lines or pins, but it can supply a plat map. Plans that use engineered wood must show the layout, spans and the stamped truss or joist details with blocking and bracing. An accessory building also needs its construction materials and a color scheme consistent with the house, cannot be started before the house itself, and cannot be used if the house has been empty for six months; accessory structures housing animals must be detached. Fences may be 6 feet tall in side and rear yards and 4 feet in the front yard, with a clear vision triangle on corner lots, and barbed or electrified fencing is banned in residential districts.

Building or remodeling a home here? Alliance handles residential permit applications, so the crew isn't waiting on the counter.

Commercial permits

Commercial work is reviewed under the 2024 International Building Code and Existing Building Code, and its plan review fee is 30% of the building permit fee. The zoning and occupancy certificate issued with the permit costs $50 for commercial and industrial buildings, against $25 for a dwelling. Signs, outdoor and seasonal sales and other temporary site uses need their own permits.

For tenant improvements and new commercial builds, Alliance handles commercial building permits through issuance. More on this: commercial building permits explained.

What comes before the building permit

• Zoning. The Board of Adjustment, seven members serving five-year terms, meets on the third Thursday of each month at 6:30 pm at City Hall to hear variances and appeals of administrative interpretations, and it also sits as the Board of Appeals. A pre-application meeting with staff (515-727-7775) is mandatory before an application is accepted.
• Floodplain. Chapter 174 of the zoning ordinance creates general floodplain, floodway fringe and floodway overlay districts; a city floodplain development permit is required, and the Iowa Department of Natural Resources may require one too.
• Stormwater. Grading permits and stormwater calculations follow the city’s stormwater management development standards.
• Site permits. Permits tied to a site can be looked up on Polk County’s GIS site, which the city links from its permit page.

Johnston permit costs and fees

Fees for most permits are figured from the value added to the property or the construction cost, run through the fee tables, and calculated by the Building Official after review. The fee table the city posts with its permit forms is section 155.09 from Ordinance 1083 (the 2021 building code), posted in January 2023.

Example: a project valued at $30,000 built under the residential code costs $309 plus five $7.50 steps, or $346.50, plus a $40 plan review fee, for $386.50 before any energy code, certificate or trade permit fees. Larger decks, screened porches, sunrooms and permanent pools are all priced on valuation.

Starting work without a permit can cost up to twice the building fee. A permit can be renewed once for another year for up to half the original fee (at least $45), and changes after fees are paid, such as finishing more space than shown, bring a $75 recalculation fee plus up to twice the fee for the added area. The 2024 code adoption may restate section 155.09, so confirm the fee with the Building Official on a large job.

Trade permits and who may pull them

Trade permits in Johnston are city permits, reviewed and inspected locally under the state-adopted codes with local amendments in chapters 154 to 158, using one trade application for all three trades. Before a contractor can receive a trade permit, it must register with the Building Department: the registration form plus a copy of the State of Iowa license, with no fee, renewed whenever the state license is renewed or a new license issued.

• Electrical: 2023 State of Iowa electrical code (NEC 2023) with Chapter 157 amendments.
• Plumbing: 2024 State of Iowa plumbing code with Chapter 156 amendments; the plumber installs an angle locking meter valve at rough-in, and construction water is included with a single-family building permit.
• Mechanical and fuel gas: 2024 International Mechanical Code (Chapter 158) and 2024 International Fuel Gas Code with Chapter 154 amendments.
• Grinder tanks: a separate city permit application.

Johnston’s registration rule is written for licensed contractors; an owner hoping to do their own wiring or plumbing should raise it with the Building Official first.

How to apply for a Johnston building permit

Review, corrections and what causes delay

Incomplete applications are not accepted at all, so missing drawings, site plans or forms send the file back before review begins. A typical review takes up to seven working days; the fence and shed guides quote five to ten and up to five working days. Projects that turn out larger than the approved plans, for example extra finished space found at inspection, are charged a recalculation fee. Sites must keep debris in a dumpster or fenced enclosure and loads must be covered, and the department checks site maintenance at every inspection and at random.

Inspections in Johnston

Call the Building Department at 515-727-7778 at least 48 hours before the inspection you need, and leave a message with the inspection type, contact name and phone number if no one answers. Inspections run first come, first served between 8:30 am and 3:30 pm on weekdays. The department’s required list for a house includes perimeter erosion controls, plumbing under the slab and the service, framing with the mechanical rough-in, and the final for the certificate of occupancy, which takes at least two business days to issue. Sidewalk, approach and curb cut inspections are booked through Public Works.

Cold-weather rules are strict: flatwork needs protection below 32 degrees and walls below 25, concrete may not be placed if the forecast drops below 10 degrees within 24 hours, and fresh concrete must be protected from freezing for 48 hours. Soil reports or engineering may be requested, and the contractor must have them before the footing inspection. Fences need a final inspection with the property pins visible.

Iowa building code

Johnston enforces the 2024 International codes adopted by city ordinance for permits submitted from February 1, 2026, with the state’s plumbing and electrical codes carried into its own chapters. The City of Johnston is listed in the participating section of FEMA’s Iowa Community Status Book for the National Flood Insurance Program; its effective flood rate map is dated February 1, 2019, and paper copies can be viewed at City Hall.

Iowa lets most cities and counties adopt the state building code, another code or none (a city of more than 15,000 must enforce at least the state code), but the energy, accessibility, fire, plumbing, mechanical and electrical rules apply statewide. Iowa rules

Johnston permit search and official resources

Johnston has no public online permit search; to find out whether work at an address was permitted or passed final inspection, contact the Building Department, which also publishes building reports. Iowa Code chapter 22, the state public records law, gives anyone the right to ask the city for copies of permit files and plans.

• Johnston Building Department
• Building permits, forms and fees
• Adopted building codes (effective February 1, 2026)
• Building inspections
• Trade contractor registration
• Building permit fee table (section 155.09)
• Fence requirements
• Accessory building requirements
• Floodplain development
• Zoning and subdivision code update
• Board of Adjustment
• 2025 Community Development annual report
• Chapter 155, Johnston Building Code (enCode Plus)
• Iowa Code chapter 22, public records
• FEMA Community Status Book, Iowa

Johnston building permit FAQs

How do I submit a building permit in Johnston?

Email the completed application and drawings to the Building Department, mail them, or drop them off at City Hall, 6221 Merle Hay Road. If an emailed application is not confirmed within 24 hours, follow up.

How long does plan review take?

The city says a typical review may last up to seven working days once a complete application is in.

Do I need a permit for a fence in Johnston?

Yes. Fences need a permit ($50 under the posted table) and a final inspection; they are limited to 6 feet in side and rear yards and 4 feet in front.

Do contractors have to register with the city?

Electrical, plumbing and mechanical contractors must register their state license with the Building Department before a trade permit is issued. There is no fee.

How far ahead should I call for an inspection?

At least 48 hours. Inspections are done between 8:30 am and 3:30 pm, Monday to Friday.

How long does a certificate of occupancy take?

At least two business days after the final inspection, so plan the move-in date around it.

Is my lot in the floodplain?

Check the FEMA flood maps at City Hall or call Community Development at 515-727-7778; building in the floodplain overlays needs a floodplain development permit.

Simplify Johnston permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in Iowa. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.

This guide is provided by Alliance Permitting for general information about Johnston permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.