Eureka, Missouri Building Permit Guide

The City of Eureka runs its own Building Department, which issues building permits and the plumbing, electrical and mechanical permits for one- and two-family houses; applications are accepted only through the City’s iWorQ portal. A permit costs $50 for work valued at $500 to $25,000 plus $3 for each additional $1,000, and the City enforces the 2018 International Building, Residential and Swimming Pool and Spa Codes.

What needs a building permit in Eureka?

The Building Department requires a permit whenever new construction, remodeling or enlargement is planned. Its pages and code name these projects:

Many subdivisions have indentures that regulate fences, decks, pools, satellite dishes and freestanding structures more strictly than the City does, so the City suggests getting subdivision approval before applying.

Eureka building department: who handles permitting

Permits inside city limits are issued by the City of Eureka Building Department, headed by John Boggs, Building Commissioner and Public Works Director. The City has adopted St. Louis County’s existing-building, mechanical, plumbing and electrical codes alongside its own 2018 building, residential and pool codes. St. Louis County’s municipality contract list (revised August 3, 2026) shows the County enforcing Eureka’s mechanical, electrical and plumbing codes, fire suppression systems and elevators for commercial, multi-family and townhouse buildings only, excluding one- and two-family dwellings; the City’s own commercial permit form also sends commercial plumbing, electrical and mechanical permits to the County. The City therefore issues the trade permits for one- and two-family houses. The City’s Electrical Permits page describes its role more broadly, as issuing permits for “all residential electric work”, so ask the Building Department before filing trade permits for an apartment or townhouse. Fire permits come from the Eureka Fire Protection District. The city’s small Jefferson County portion (81 residents in the 2025 Census estimate) is still inside city limits.

Applying through the iWorQ portal

Eureka no longer accepts paper permit applications. The iWorQ portal offers a Residential Application (which includes fences) and a Commercial Application, plus a permit search for existing permits and inspection requests. Online submission does not replace the signed paper form: download the residential or commercial permit application from the City’s Applications & Forms page, have the property owner and every contractor sign it, and upload it with the rest of the package. All documents must be PDFs; photos are not accepted.

Eureka permit fees

Building permit fees are set in Section 5-3.15 of the City Code, as amended by Ordinance 2475 in February 2019; no fee or code ordinance appears in Board of Aldermen minutes for 2026. The Building Commissioner sets the value of construction from the applicant’s estimate, ICC valuation tables adjusted for the St. Louis area, similar projects or a component estimate.

For example, an addition valued at $100,000 pays a building permit fee of $275: $50 for the first $25,000 and $3 for each of the 75 additional thousands. The code also charges a per-inspection fee on building permits and sets the plumbing inspection schedule; both are adjusted each January 1 by the St. Louis consumer price index, so the current amounts appear on the City’s invoice. Costs the City pays to outside plan reviewers or testing firms are passed on to the applicant, and all reinspection fees must be paid before the final inspection.

The City’s August 2025 permit forms also carry lines for water and sewer connection and impact fees. The code sets water and sewer impact fees of $1,000 and $250 per single-family house in new developments (single-lot owner-built houses are exempt), although water and sewer service itself is now provided by Missouri American Water.

Electrical, plumbing and mechanical work in Eureka

Electrical: the City issues electrical permits for one- and two-family houses, which must be applied for by a licensed St. Louis County electrician. A homeowner may pull a permit for branch-circuit work on a single-family home or its accessory buildings if he or she owns and lives (or will live) there, does all the work personally and passes the City’s homeowner electrical exam.

Plumbing: plumbing permits come from the City and follow the St. Louis County plumbing rules, with a City rule on water service sizing (1-inch line up to 4½ baths, 1½-inch above). For a residential water heater, the owner may apply for the City permit on the contractor’s behalf within 72 hours of installation.

Mechanical: installing or repairing mechanical equipment needs a $50 City permit, and the installer must hold a licence from the St. Louis County Board of Mechanical Examiners.

Commercial, multi-family and townhouse trades, and fire: plumbing, electrical and mechanical permits for these buildings are obtained from St. Louis County. The Eureka Fire Protection District permits commercial construction and remodels, fire suppression and detection systems, storage tanks (most often propane), sprinkler and kitchen hood systems and air curtain burn pits.

Alliance handles electrical permit expediting for contractors here. More on this: who pulls the electrical permit.

How to get a Eureka building permit

Eureka inspection schedule

Building inspections are made in a morning window (8:00 to 11:30 a.m.) on Mondays, Wednesdays and Fridays and an afternoon window (12:30 to 3:00 p.m.) on Tuesdays and Thursdays. Request them through the iWorQ portal or the Building Department inspection hotline at 636-938-5233, extension 180, with the permit number; the City’s permit forms ask for 24 hours’ notice. A failed building or mechanical inspection carries a $20 reinspection charge, payable within 30 days and before the final inspection is requested.

A permit stays valid for 180 days from issue or from the last approved inspection. On roofs, the City’s residential code amendments require a drip edge but not an ice-and-water shield.

Selling a property, floodplain rules and other Eureka details

Change of ownership: a building may not be occupied after a change of ownership until the Building Department has issued a Certificate of Exterior Appearance Compliance. The seller or seller’s agent applies, pays a $10 inspection fee and includes a copy of a valid state ID; the certificate is valid for six months. Newly built homes are exempt if their occupancy permit was issued within 30 days before the sale.

Floodplain: the Building Commissioner is Eureka’s floodplain administrator. Development in the A and AE zones shown on the St. Louis County flood maps dated February 4, 2015 needs a floodplain development permit, and new or substantially improved homes must have the lowest floor, including any basement, at least one foot above the base flood elevation.

Driveways: with slight exceptions, no driveway or driveway extension may be built or used without City approval, using the City’s driveway application.

Missouri building code

Missouri has no mandatory statewide building code for private construction: a county, fire protection district or municipality may adopt one (usually by reference under RSMo 67.280), and in parts of the state none has. Building codes in Missouri

Eureka permit FAQ

Who issues building permits in Eureka, Missouri?

The City of Eureka Building Department at 120 City Hall Drive (636-938-5233). Plumbing, electrical and mechanical permits for commercial, multi-family and townhouse buildings come from St. Louis County.

How much is a building permit in Eureka?

$50 for work valued at $500 to $25,000, plus $3 for each additional $1,000 or part of $1,000. A $100,000 project pays $275, plus inspection charges.

Do I need a permit for a fence or water heater?

Yes. Eureka requires permits for fences and for water heater installations; a homeowner can apply for the water heater permit within 72 hours of installation.

Can a homeowner do electrical work?

Yes, for branch circuits in a single-family home the owner lives in, after passing the City’s homeowner electrical exam. Other electrical permits for houses must be pulled by a St. Louis County licensed electrician.

What is needed to sell a house in Eureka?

A Certificate of Exterior Appearance Compliance from the Building Department; the seller applies and pays a $10 inspection fee.

When are inspections done?

Mornings (8:00 to 11:30) on Monday, Wednesday and Friday and afternoons (12:30 to 3:00) on Tuesday and Thursday.

Eureka permit search and official resources

• Eureka Building Department
• Eureka residential permits
• Eureka iWorQ permit portal
• Eureka residential building, plumbing and electrical permit application
• Eureka commercial permit application
• Eureka electrical permits and homeowner test
• Eureka Municipal Code
• Eureka City Code Chapter 5, building codes and permit fees
• Eureka City Code Chapter 10A, floodplain management
• St. Louis County municipality contract list (codes the County enforces in each city)

Simplify Eureka permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in Missouri. 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 Eureka permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.