Home Building
Johnston, IA
Building a new home in Johnston starts at about $150 per square foot with Busy Builders. The city asks for more paperwork on a new house than on any other permit, including grading and water service applications. Here is what that set includes and what else to plan for.
- Johnston at a glance
A fast-growing Johnston
Johnston grew from 8,649 residents in 2000 to an estimated 25,065 in 2025. Seven of every ten homes are owner-occupied. Census Bureau and State Data Center figures.
25,065
Residents, 2025 estimate
$369,100
Median value, owner-occupied
70.8%
Share of owner-occupied homes
40 sq miles
Johnston school district area
$150 per sq ft
New homes start about here
4 city forms
New-house application set
Water service
Separate city application
July 1, 2026
HF 2297 effective date
Sources: U.S. Census Bureau QuickFacts (2025 estimate, ACS 2020 to 2024); State Data Center of Iowa (2000); Johnston Community School District maps and boundaries.
- Permits and rules
New home permits in Johnston, step by step
A new house in Johnston needs a building permit and more. The city links a New Residential Home Application Packet, a New House Building Permit Checklist, a Grading Permit Application and a Water Service Application. Fees follow the value of construction.
The new-home packet
Johnston’s New Residential Home Application Packet is the core of the submittal. The New House Building Permit Checklist lists what the city wants to see with it. Both are linked from the city’s Permits and Fees page. Every permit also needs a site plan with measured property lines.
Grading and water service
A new house goes beyond the building permit. Johnston has a separate Grading Permit Application for site work and a Water Service Application for the connection. Connection or impact fee amounts are not posted on the city’s permit pages, so ask before you set a budget.
Plan review time
The city’s permits page says a typical review may last up to 7 working days, if not more. A new home has the most pieces to check of any permit. Sending the full packet and checklist items together keeps the review in one pass.
Fees based on value
Johnston sets most permit fees from the value added to the property or the cost of construction. It uses the fee tables from the codes it has adopted. Flat fees apply only to a short list of items, such as fences and small uncovered decks.
Radon and the new state law
Iowa’s HF 2297 was signed and took effect July 1, 2026. Its passive radon requirement for new homes starts once the State Building Code Commissioner adopts it. About 5 in 7 Iowa homes test above the EPA action level of 4 pCi/L.
Lots and the zoning code update
Johnston’s zoning and subdivision code update lists older districts such as R-1(90), R-1(A) and R-1(150) for elimination and rezoning. If you are buying a lot, ask Community Development which district applies today and what the new code will change.
Sources: Johnston Permits and Fees (new home packet, checklist, grading, water service, fees); Johnston building permit application; Johnston Zoning and Subdivision Code Update.
- Our process
How Busy Builders builds your Johnston new home
We start with the lot: its current zoning district, the grading, and the water service route. Then we assemble the new-home packet, the checklist items, the grading application and the water service application, and file them together. Licensed trades we coordinate handle electrical, plumbing and HVAC.
We put the cost and the timeline in a written estimate and schedule. Busy Builders is registered with DIAL as C140184.
- Lot and zoning checked first
- Full new-home packet filed at once
- Grading and water service applications included
Lot check to move-in
- Achievement
Trusted Home Building Contractors in Johnston, IA
- Frequently Asked Questions
FAQs About Home Building in Johnston
What does it cost to build a house in Johnston?
New homes with Busy Builders start at about $150 per square foot. Final costs vary by scope, materials, complexity and location within our service area. Size, finishes, the lot, grading and the water service connection all affect the total. We price your plan in a written estimate.
What forms does Johnston need for a new house?
The city links four: a New Residential Home Application Packet, a New House Building Permit Checklist, a Grading Permit Application and a Water Service Application. The building permit also needs a site plan with measured property lines and the footprint of the house.
How are new home permit fees set in Johnston?
By value. Johnston figures the fee from the value added to the property or the construction cost, using its code fee tables. The city does not post dollar amounts on its permits page, so ask the Building Department at 515-727-7778 for a figure.
Does a new home in Johnston need radon protection?
Iowa’s HF 2297 took effect July 1, 2026. Its passive radon requirement for new homes applies once the State Building Code Commissioner adopts it. Radon is common across Iowa, so planning for it during design makes sense either way.
Which schools serve a new home in Johnston?
Much of Johnston is served by Johnston Community School District, which spans 40 square miles and about 7,250 K-12 students. Middle and high schools have no attendance boundaries. Elementary assignment comes from the district’s school locator, so check a lot’s address before you buy.
How long before I can break ground in Johnston?
Plan on at least 7 working days of city review after a complete submittal. A new house needs the application packet, checklist, grading and water service forms, and a site plan. We build that review time into the schedule we give you.
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