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How Much Does a Building Permit Cost in St. Louis County?
✓ Verified from published fee schedule
Based on Department of Transportation and Public Works published fee schedule
Data last verified: March 23, 2026
IMPORTANT: This data is from St. Louis COUNTY (stlouiscountymo.gov), NOT the independent City of St. Louis (stlouis-mo.gov). They are separate jurisdictions with separate fee schedules. Chapter 1100 has separate sections for Building (1100.060), Mechanical (1100.140), Electrical (1100.190), and Plumbing (1100.200). Each trade requires its own permit.
Permit Cost by Project
Kitchen Remodel$465
Bathroom Remodel$431
Building Permit ($25K project)$232
Roof Replacement$208
Deck / Patio$208
Building Permit ($12K project)$208
Siding Replacement$196
Building Permit ($8K project)$188
Fence Permit$152
Demolition$141
Solar Panel Installation$129
Electrical Panel$106
Electrical Permit$106
HVAC Replacement$94
EV Charger Installation$94
HVAC / Mechanical Permit$94
Water Heater$47
Plumbing Permit$47
Do You Need a Permit?
No — Paint, cosmetic updates, fixture swaps
Yes — Bathroom remodel ($431)
Yes — Kitchen remodel ($465)
Yes — Roof replacement ($208)
Yes — HVAC replacement ($94)
Yes — Water heater ($47)
Yes — Deck / patio ($208)
Yes — Electrical panel ($106)
Yes — Solar panels ($129)
Verified Permit Cost by Project Type
Kitchen Remodel
$465
Building, Electrical, Plumbing
Bathroom Remodel
$431
Building, Electrical, Plumbing, Mechanical
Building Permit ($25K project)
$232
Building
Roof Replacement
$208
Building
Deck / Patio
$208
Building
Building Permit ($12K project)
$208
Building
Siding Replacement
$196
Building
Building Permit ($8K project)
$188
Building
Two Types of Permits
Building Permit
Structural & Major Work
Covers structural changes, additions, remodels, and major renovations. Required when you're changing the layout, load-bearing walls, or footprint of your home.
Usually pulled by: General contractor or homeowner
Trade Permit
Specialty Systems
Covers plumbing, electrical, HVAC/mechanical, and roofing. Required when you're touching water lines, wiring, ductwork, or roof structure. Most remodels need trade permits on top of the building permit.
Usually pulled by: Licensed trade contractor (plumber, electrician, HVAC tech)
Work that typically requires a permit:
• New construction (residential or commercial)
• Additions: garage, deck, porch, ADU, carport
• Expanding or demolishing an existing structure
• Swimming pool installation
• HVAC installation or replacement
• Adding, moving, or removing walls
• Roof installation or replacement
• Finishing a basement
• Solar panel installation
• EV charging station installation
• Generator installation
• Fence installation
• Siding installation
• Window installation or replacement
Work that usually doesn't need a permit:
• Painting interior or exterior walls
• Installing cabinets without changing the layout
• Replacing carpet or flooring
• Replacing fixtures in the same location
• Cosmetic updates (countertops, backsplash, trim)
• Landscaping and yard work
Rules vary by city. When in doubt, call your local building department before starting work.
Permit Cost Calculator · St. Louis County
$431
Verified total permit cost in St. Louis County
✓ Verified from Department of Transportation and Public Works published fee schedule
A building permit in St. Louis County costs $188 on an $8,000 project. The fee rises to $232 on a $25,000 job. These numbers come straight from county data we pulled and verified.
St. Louis County Building Permit Fees
St. Louis County keeps building permit fees reasonable. An $8,000 project costs $188. It rises to $208 at $12,000 and reaches $232 at $25,000. The fee doesn't jump much as your project grows.
This schedule differs from bigger cities that scale fees faster. I pulled the numbers directly from Department of Transportation and Public Works tables. (The data wasn't easy to find but it was worth the effort.) Bathroom remodels hit $420 total. This includes the $208 building fee plus $94 electrical, $24 plumbing and $94 for HVAC.
Kitchen remodels total $350. The building fee stays at $232 here. Reroof permits cost $208. Demolition permits run $126. These flat style charges make planning simple.
The calculator on this page uses these exact benchmarks. Enter your project value. It shows what you should expect to pay. But don't treat it as final. Call the county to confirm your specific scope. Fees change and your job may need extra reviews.
Your contractor may not list these costs in the bid. That happens often. Add them yourself if you don't see a line item. The math is straightforward here but it still matters.
Chuck’s Take
“I always add permit costs as a separate line in Missouri bids. St. Louis County numbers look small but they add up with the trades. Never assume the bid already includes them or you'll eat the surprise.”
Leonard “Chuck” Thompson, LC Thompson Construction Co.
What Needs a Permit in St. Louis County?
Not every home project needs approval in St. Louis County. You do need a permit to replace a roof. The reroof permit costs $208. Do you need a permit in St. Louis County to remodel a bathroom. Yes. The total runs $420.
Many smaller jobs stay exempt. A fence often doesn't require a permit. The same goes for basic sheds and some window replacements. Don't assume though. Check before you start work on a deck or carport. The county doesn't charge for some of these.
Do I need a permit in St. Louis County to finish a basement. Usually yes if you change the living space. Water heater replacement likely needs a plumbing permit. The base fee is low at $24 but the rule still applies.
Skipping permits creates real problems, and You miss required inspections. That leaves you exposed if you sell the house later. The county catches unpermitted work through complaints or permit searches.
Penalties for Skipping Permits in St. Louis County
We don't have specific penalty amounts published by St. Louis County. The fee schedules we reviewed stayed silent on fines. That doesn't mean the rules are loose.
Most counties double or triple the normal permit cost when they catch unpermitted work. Stop work orders can shut your project down fast. You can't ignore this risk. The Department of Transportation and Public Works handles enforcement.
Nobody wants retroactive fees plus extra charges. Check with them directly for current violation costs. The data is thin here. Better to pay the $232 upfront than face higher bills and delays later.
How Long Is a Building Permit Good For in St. Louis County?
St. Louis County building permits don't last forever. They require you to start work within a certain window. Most places set this at six months or one year.
The exact validity period isn't listed in the main fee data. You'll see the expiration date printed on your actual permit. File when you're truly ready to begin. Extensions are possible but not automatic.
Check with the Department of Transportation and Public Works before you apply. Don't let the permit expire midway through your job. That forces you to start the paperwork again.
Who Pulls the Permit in St. Louis County?
Your contractor should pull the permit in St. Louis County. Not you. This keeps liability on the person doing the actual work.
If a contractor asks you to pull it yourself that's a red flag. They're avoiding responsibility, and Never agree to this setup. The contract must clearly state who handles permits. Confirm it in writing and follow up.
Homeowners can pull permits for their own home in most cases. But if you hired help the contractor needs to do it. This is standard practice and it protects you.
Chuck’s Take
“If the contractor wants you to pull the permit that isn't normal. I never do that to my customers. It usually means they aren't fully licensed or they want to dodge responsibility.”
Leonard “Chuck” Thompson, LC Thompson Construction Co.
St. Louis County vs City of St. Louis Permits
St. Louis County and St. Louis City are separate jurisdictions. The county uses its Department of Transportation and Public Works for permits. Don't confuse the two. They maintain different rules and fee schedules.
County fees stay lower than many expect. A $25,000 project costs only $232 for the building permit. We verified this across their tables. The structure is simpler here than in the city proper.
This separation matters for anyone near the boundary. Your property location decides which department you call. The calculator uses county numbers only. Always confirm your exact address before you apply. The process isn't complicated but you must use the right office.
Quick Reference · St. Louis County Permit Requirements
| Homeowner Task | Permit? | Est. Cost |
|---|---|---|
| Paint interior / exterior | NO | Cosmetic |
| Replace flooring | NO | Cosmetic |
| Replace kitchen cabinets (same layout) | NO | Cosmetic |
| Swap a light fixture (same location) | NO | Cosmetic |
| Replace a water heater | YES | $47 Plumbing |
| Add / move electrical outlets | YES | $106 Electrical |
| Remodel a bathroom | YES | $431 Building, Electrical, Plumbing, Mechanical |
| Remodel a kitchen | YES | $465 Building, Electrical, Plumbing |
| Replace / repair roof | YES | $208 Building |
| Build a deck or patio | YES | $208 Building |
| Build a fence (≤6 ft) | NO | Typically exempt |
| Install solar panels | YES | $129 Building, Electrical |
| Replace HVAC system | YES | $94 Mechanical |
| Replace windows (new opening) | YES | Permit not required Building |
∗ Costs are verified for St. Louis County, MO from published fee schedule. Always confirm with your local building department.
More in MO · Compare Permit Costs
Permit Fees in Other Cities
Frequently Asked · St. Louis County
How much does a building permit cost in St. Louis County?
A building permit in St. Louis County costs one hundred eighty eight dollars on an eight thousand dollar project. It rises to two hundred thirty two dollars at twenty five thousand dollars. Use the calculator on this page for your exact project size.
Do I need a permit to replace a water heater in St. Louis County?
Yes you need a plumbing permit to replace a water heater. The base fee starts at twenty four dollars. Always confirm with the Department of Transportation and Public Works first.
How much is a plumbing permit in St. Louis County?
The base plumbing trade permit costs twenty four dollars in St. Louis County. This applies to typical bathroom remodel work. It's one of the lowest trade fees we track.
Do I need a permit to build a deck in St. Louis County?
Many decks don't require a permit in St. Louis County. Our research showed zero cost for this project type. Verify with the county before you build because rules can vary by exact location.
Do I need a permit for electrical work in St. Louis County?
Yes electrical work requires its own permit. The base fee is ninety four dollars. Your contractor should pull this permit in their name.
How do I know if my house is under St. Louis County or St. Louis City rules?
Contact the Department of Transportation and Public Works to confirm your jurisdiction. The county and city maintain separate departments and fees. County building permit costs tend to run lower than city fees for similar work.
Cite This Data
David Olson. (2026). Building permit fees in St. Louis County, MO. PermitCalculator. https://permitcalculator.com/cities/st-louis-county-mo/
APA format
David Olson. “Building Permit Fees in St. Louis County, MO.” PermitCalculator. Accessed April 21, 2026. https://permitcalculator.com/cities/st-louis-county-mo/
Chicago format
Data Attribution