Mexico, Missouri Building Permit Guide

In Mexico, Missouri, the City’s Building Inspections office at City Hall, 300 N. Coal Street, issues construction permits and inspects work inside city limits. Under the fee schedule that took effect on October 1, 2026, a new one- or two-family home costs $0.20 per square foot of finished area, trade permits included, and most other permits cost $5 per $1,000 of project cost with a $10 minimum.

What needs a permit in Mexico?

The Building Inspections office lists the work it permits inside the city limits:

An electrical permit is needed for wiring a structure not wired before, for rewiring that adds circuits or replaces the service panel, and for extending wiring to supply any device, equipment or appliance; replacing individual outlets, switches, receptacles or light fixtures is excluded. Electrical permits expire one year after issue.

Mexico building department: who handles permitting

Building Inspections, part of the City’s Community Development department, has two building officials who interpret and enforce the adopted codes, review and issue building permits and inspect construction on industrial, commercial and residential buildings within the city limits. Dennis Houchins is the Building Official. The City Manager or a designee is the floodplain administrator.

The Mexico permit application

Mexico uses one Construction Permit and Plan Review Application for building and sign permits. It asks for the total project value including electrical, plumbing and mechanical work, the value of each subcontractor’s work, the present and proposed use, lot and building areas, number of dwelling units, use group and construction type, the property’s zoning and whether it is in a flood zone. By signing, the applicant accepts that a certificate of occupancy must be issued before the building is occupied.

The City encourages a pre-construction meeting to settle zoning, code and plan review questions, and the Building Official will do a brief preliminary review of drawings by appointment, checking seals and signatures, the code summary, the soils report, structural calculations and the statement of special inspections. Plans can also go to the City’s landscape reviewer, the City Engineer (stormwater and road easements), Public Works (water, sewer, curb and gutter, grease traps), the Fire Department (sprinklers, hydrants, fire lanes) and the Health Department (food service).

Mexico permit fees

On September 14, 2026 the City Council passed Ordinance 4603, repealing the fee schedule adopted in February 2018 and adopting a new municipal fee schedule effective October 1, 2026. Its building and construction fees are:

For example, a new 2,000 sq ft house (finished area) pays $400 for its building permit, with no separate trade permit fees; a $40,000 commercial remodel pays $200. No sidewalk or driveway fee is charged when the work goes with a building permit, unless City engineering is needed.

Trade permits and contractor licences

Electrical, plumbing and mechanical permits are required on new construction and remodels. For a new one- or two-family home they are included in the square-foot building fee; other trade work pays $5 per $1,000 of project cost. Electrical permits are issued by the building official on a written application giving the work, the panel amperage and the number of circuits.

Contractors, electricians and plumbers are licensed through the City Clerk. A contractor’s licence carries a $25 licence tax and proof of general liability insurance of at least $100,000 per person and $300,000 per accident for bodily injury and $50,000 per accident and $300,000 aggregate for property damage; electricians and plumbers pay a $30 licence tax for the calendar year, due by January 1, and must show the same liability insurance (Sections 6-191 and 6-231). An owner may do contracting work on their own property if it is not being built for sale, and may do their own wiring or plumbing in a single-family home that is not being built for sale and will not be sold for at least a year after the work, provided they do all the work themselves under a permit and have it inspected.

How to get a Mexico building permit

Plans, inspections and occupancy

Plans are required to build or alter a structure, build an addition, demolish or move a structure, or change a building’s occupancy. The City’s plan review packet asks for at least two complete, bound sets of construction documents, with each sheet sealed, signed and dated by an architect or engineer registered in Missouri and the design professional in responsible charge named on the application.

Signs need a site plan, footing details and wiring details; pools need a site plan, a section, electrical and plumbing plans and enclosure details; fences need a site plan and the fence type, height and location. The building officials inspect construction for compliance with the adopted codes, and the building may not be occupied until a certificate of occupancy is issued.

Local Mexico rules

Codes: the City enforces the 2015 International Building, Residential, Mechanical, Fire, Fuel Gas, Plumbing and Property Maintenance Codes and the 2014 National Electrical Code (Ordinance 4410, March 25, 2019). The 2015 International Existing Building Code applies in the C-3 business districts to buildings built before March 25, 2019. Local amendments set a 30-inch frost depth and a 20 psf ground snow load and require gas piping to be tested at 30 psig.

Floodplain: Mexico takes part in the National Flood Insurance Program, using the Audrain County flood maps dated April 5, 2010. Development in mapped flood areas needs a floodplain development permit, and new or substantially improved homes must have the lowest floor, including any basement, 1 ft above the base flood elevation.

Appeals: a decision of the building official can be appealed to the Building Code Board of Appeals within 30 days, with a $150 fee.

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

Mexico building permit FAQ

Who issues building permits in Mexico, Missouri?

The City’s Building Inspections office at City Hall, 300 N. Coal Street (573-581-2100).

How much is a building permit for a new house?

$0.20 per square foot of finished area, which includes the plumbing, electrical and mechanical permits: $400 for a 2,000 sq ft house.

How much do other permits cost?

$5 per $1,000 of total project cost, with a $10 minimum, under the fee schedule effective October 1, 2026.

Do I need a permit for a fence or a pool?

Yes. Fences need a permit in residential, commercial and industrial districts, and pools that hold water 24 inches deep or more need a pool permit.

Can I do my own electrical or plumbing work?

In a single-family home you own that is not being built for sale and will not be sold for at least a year, yes, if you do all the work yourself under a permit and have it inspected.

Which codes does Mexico use?

The 2015 International Building, Residential, Mechanical, Fire, Fuel Gas, Plumbing and Property Maintenance Codes (plus the Existing Building Code in C-3 districts) and the 2014 National Electrical Code, with local amendments.

Mexico permit search and official resources

• Mexico Building Inspections
• Mexico building permit forms and applications
• Construction Permit and Plan Review Application
• Mexico plan review process packet
• Mexico city fee schedule (effective October 1, 2026)
• Mexico City Code Chapter 6, buildings and construction
• Mexico City Code Chapter 16, floodplain management
• Mexico City Council agendas and minutes

Simplify Mexico 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 Mexico permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.