Do I Need a Permit to Replace a Water Heater in Overland Park?
By FlowRight Plumbing of Overland Park · · Sources linked in each section
Short answer: yes. Overland Park’s plumbing code exempts only a short list of minor work from permits, and replacing a water heater isn’t on it. Here’s what the code actually says, who is allowed to pull the permit, how emergencies are handled, and what the inspection checks.
What the code says
Overland Park adopted the 2024 International Plumbing Code with local amendments, effective July 1, 2026 (Ordinance BC-3499). The plumbing work that doesn’t need a permit is narrow: stopping leaks, clearing stoppages, and repairs that don’t replace or rearrange valves, pipes or fixtures. Once defective concealed pipe has to be removed and replaced, the code treats it as new work that needs a permit and inspection.
A water heater replacement swaps out a piece of equipment along with its water, gas and vent connections, so it falls outside the exemptions. Third-party permit guides that track Overland Park’s rules also list water heaters as permitted work.
Source: Overland Park Ordinance BC-3499 (2024 International Codes, effective July 1, 2026). Checked October 2026.
Why a “simple swap” needs a permit
A water heater combines water under pressure, high temperatures, and, for gas units, combustion and exhaust. The permit and inspection exist to catch the things that make a heater dangerous rather than just inconvenient: a relief valve that can’t discharge safely, a vent that spills exhaust back into the house, or a gas connection that leaks.
Replacement is also the moment when an older installation gets brought up to current requirements. Items that may have been fine when the old heater went in can be required now.
Who can pull the permit?
The same ordinance requires anyone pulling a permit to hold a current Johnson County contractor’s license. The one exception is a homeowner who lives in (or will live in) a single-family home and does the work personally. You can check any contractor on the county’s licensed contractor search.
Johnson County issues plumbing contractor licenses by class; a Class DP license covers plumbing work only (license types). When we replace a water heater, the permit is part of the job.
Sources: Overland Park Ordinance BC-3499 (2024 International Codes, effective July 1, 2026); Johnson County Contractor Licensing: license types; Johnson County: search for licensed contractors. Checked October 2026.
What if the old heater fails on a Saturday?
You don’t have to go without hot water until City Hall opens. For true emergencies, Overland Park’s code lets the repair happen first: the permit application is due within the next working business day. The work still gets inspected.
Source: Overland Park Ordinance BC-3499 (2024 International Codes, effective July 1, 2026). Checked October 2026.
What an inspector typically looks at
- Temperature-and-pressure relief valve, and a discharge line that runs to an approved location
- Venting: correct size, slope, connections and clearances (gas units)
- Gas connection, shutoff and sediment trap (gas units)
- Thermal expansion control where the water system is closed. The 2024 IPC also requires a pressure-reducing valve where static pressure exceeds 80 psi
- Drain pan where the heater’s location requires one
Olathe, Lenexa and unincorporated Johnson County
- Olathe: the city’s residential code amendments use the same permit-exemption list, and emergency repairs need a permit application by the next business day (OMC 15.04.080).
- Lenexa: the city lists water heater replacement as requiring a building permit, applied for through its online portal; residential reviews take about 5 business days, and contractors need a Lenexa business license plus a Johnson County contractor’s license (City of Lenexa).
- Stilwell and other unincorporated areas: permits come from Johnson County Building Codes. See our Stilwell guide.
Sources: Olathe Municipal Code 15.04.080 (residential code amendments, R105.2); City of Lenexa: Remodeling Projects (permits); Johnson County Building Codes. Checked October 2026.
What happens if a heater is replaced without a permit?
Unpermitted work can surface later, often at a home sale when an inspector notices a new heater with no permit record, or after an insurance claim. It can also mean nobody checked the venting or the relief valve. In Lenexa, the city charges an investigation fee equal to the permit fee when work starts without one.
Source: City of Lenexa: Remodeling Projects (permits). Checked October 2026.
Tank vs tankless: the permit picture
Switching from a tank to a tankless heater involves the gas line, venting, and the water connections, and sometimes electrical work for the unit’s controls, so expect a permit and possibly more than one trade. See tankless water heaters.
Frequently asked questions
Does a like-for-like replacement still need a permit?
Yes. Overland Park’s code only exempts stopping leaks, clearing stoppages and repairs that don’t replace or rearrange valves, pipes or fixtures. Replacing the heater is outside that.
Can I pull the permit myself?
In Overland Park, only if you own and live in (or will live in) the single-family home and do the work yourself. Otherwise the permit is pulled by a contractor with a current Johnson County license.
What if my water heater fails on a weekend?
Overland Park lets emergency replacements proceed, with the permit application submitted within the next working business day.
Related pages
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