Do I need a permit in St. Matthews, Kentucky?
St. Matthews is a built-out suburban municipality in Jefferson County with its own building department and code enforcement. Like most Kentucky jurisdictions, St. Matthews has adopted the International Building Code (with state amendments) and enforces it through the City of St. Matthews Building Department. Because St. Matthews is a small city surrounded by Louisville and its unincorporated county areas, its permit rules are tighter than surrounding unincorporated Jefferson County — and faster to navigate if you know where to go. The city sits in IECC climate zone 4A with a 24-inch frost depth, which affects deck footings, foundation work, and any exterior project that breaks ground. St. Matthews allows owner-builder permits for owner-occupied residential projects, but you'll need a licensed contractor for most commercial work and for any project involving mechanical, electrical, or plumbing systems. The permit process is straightforward: submit your application and plan set to the Building Department, pay the fee (based on project valuation), and wait for plan review. Most routine residential permits issue within 2-3 weeks. Electrical and mechanical work often requires a separate subpermit and inspection by the state or a licensed contractor.
What's specific to St. Matthews permits
St. Matthews adopted the 2021 International Building Code (with Kentucky amendments) as of the most recent code cycle. This means your project must meet the 2021 IBC plus any state-level Kentucky Building Code amendments — not the 2012 or 2018 editions. The 24-inch frost depth is shallower than some neighboring areas; decks, porches, and foundation elements must bottom out at 24 inches below final grade to avoid frost heave. The city sits on karst limestone with bluegrass clay soils, which means drainage and foundation settlement are common concerns — inspectors pay close attention to footing depth, backfill, and grading around buildings.
Owner-builders can pull permits for owner-occupied residential work (single-family homes, duplexes they own and occupy), but the city requires proof of ownership and occupancy. Most commercial projects, additions with mechanical/electrical systems, and any work by contractors require a licensed Kentucky contractor license. Electrical work almost always requires a separate electrical permit issued by the state or a licensed electrician. Plumbing and HVAC work similarly require licensed trades. Do not assume you can skip this — the city and state coordinate inspections and will flag unpermitted MEP work during final inspection.
The St. Matthews Building Department processes permits in-person and (in many cases) online. As of this writing, the city offers online filing through a permit portal — search 'St. Matthews KY building permit portal' to confirm current access and to check portal status before you file. Over-the-counter same-day permits are issued for certain small projects (minor repairs, roofing replacements, simple sheds) if plans are minimal and the project is straightforward. Plan review times run 2-3 weeks for standard residential projects and 3-4 weeks for commercial or complex work. Resubmissions after comments add another 1-2 weeks.
Common rejection reasons in St. Matthews: missing or incomplete site plans (property lines, setbacks, existing structures not shown); no proof of owner occupancy for owner-builder permits; electrical or plumbing work by unlicensed persons; decks or foundation work that doesn't show footing depth (24 inches minimum); roof pitch or overhang dimensions missing; and no certification of contractor licensure for commercial projects. The single fastest way to avoid delays is to submit a complete site plan with the application — show your lot lines, the location of your project on the lot, setbacks, and any existing structures. Include a section view or detail for any work that goes into the ground.
St. Matthews inspections are scheduled by the homeowner or contractor through the Building Department. Most inspections happen within 24-48 hours of a request, though during peak construction season (spring and early summer) waits can stretch to 3-5 days. Electrical and plumbing inspections may be performed by state inspectors or third-party agencies under contract, not city staff — coordination is the building department's job, but allow extra time if the work crosses into state-regulated trades. Final inspection must be passed before you occupy the building or close out a commercial project.
Most common St. Matthews permit projects
St. Matthews sees the typical range of residential and small commercial work: decks, sheds, roof replacements, electrical upgrades, HVAC replacements, basement finishes, additions, and small commercial tenant improvements. Each has its own thresholds and requirements. Use the checklist below to determine what you likely need a permit for and what the application process looks like.
St. Matthews Building Department contact
City of St. Matthews Building Department
Contact St. Matthews City Hall for the Building Department address and mailing address
Search 'St. Matthews KY building permit phone' or call St. Matthews City Hall to confirm the Building Department direct line
Mon-Fri, 8 AM - 5 PM (verify locally — hours may vary seasonally or by department)
Online permit portal →
Kentucky context for St. Matthews permits
Kentucky is a home-rule state, which means cities like St. Matthews can set their own building code (within state guidelines) and enforce it locally. St. Matthews has adopted the 2021 International Building Code plus Kentucky state amendments. The state of Kentucky regulates electrical contractors (via the Kentucky Department of Occupations and Professions), plumbing contractors (similar oversight), and HVAC contractors — so any work in these trades must be performed by licensed persons even if the city doesn't explicitly require the subpermit. Residential electrical work in a single-family home can sometimes be done by the homeowner (owner-builder exemption), but the best practice is to verify with the building department before you wire anything. Kentucky does not have a statewide residential energy code addendum that is stricter than the 2021 IECC, so the building code as adopted by St. Matthews is your governing standard. Flood plain, wetland, and environmental review rules are handled jointly by St. Matthews and Jefferson County — if your project sits in or near a flood plain (particularly along local creeks), the city will require additional documentation and state review. The city is part of the Louisville metro area and may coordinate on regional utility and drainage matters.
Common questions
Does a small shed need a permit in St. Matthews?
Accessory structures (sheds, playhouses, storage buildings) under 200 square feet typically do not require a permit if they have no electrical, plumbing, or HVAC systems and are set back from property lines per local zoning. Anything larger, or anything with utilities, requires a full permit. Call the Building Department before you order materials to confirm the size threshold and setback rules for your specific lot.
Can I reroof my house without a permit?
No. Reroofing always requires a permit in St. Matthews. Roofing permits are inexpensive (usually $75–$150) and often issued over-the-counter if the plan is simple. You'll need to submit the roof pitch, material type (shingles, metal, etc.), and confirm the home's age. If the home was built before 1988, asbestos testing may be required before removal. The permit also triggers a final inspection to confirm the roof meets current code (e.g., ventilation, flashing, wind ratings in case of code changes).
I want to finish my basement. Do I need a permit?
Yes. Basement finishing always requires a permit because it involves work that affects egress, ventilation, electrical, and potentially plumbing. The building code requires at least one egress window (per IRC R310.1) — a bedroom in a basement must have a compliant egress window or door. The permit also covers drywall, framing, electrical circuits, and HVAC ductwork. Plan to submit a basement plan showing wall locations, the egress window location and size, and electrical layout. Plan review is typically 2-3 weeks.
What's the frost depth in St. Matthews and why does it matter?
St. Matthews has a 24-inch frost depth. This means any structural element that touches the ground (deck posts, foundation footings, fence posts) must be set at least 24 inches below the final grade line. If you don't go deep enough, frost heave in winter will lift the structure and cause damage. Deck permits always require a footing detail showing 24-inch depth. Frozen ground is most common November through March — most footing inspections happen May through September when the ground is accessible.
Do I need a licensed contractor to add a deck?
For an owner-occupied single-family home, you can pull an owner-builder permit and build the deck yourself. You must own and occupy the home. For a rental property, investment property, or multi-unit building, you need a licensed general contractor or carpenter. The permit application will require you to state whether you're the owner-builder or naming a licensed contractor. If you're hiring someone, get a copy of their Kentucky license before signing a contract. All deck work requires a footing inspection (at 24 inches) and a final inspection before use.
How much do St. Matthews permits cost?
St. Matthews uses a valuation-based fee schedule. Most residential permits run 1–2% of the project's estimated cost. A $5,000 deck might be $75–$150; a $50,000 addition might be $500–$1,000. Electrical subpermits are often flat fees ($40–$100). Roofing and siding permits are usually in the $75–$200 range. The city does not charge separate plan-check fees — they're bundled into the permit fee. Call the Building Department with your project scope and cost estimate for an exact quote before you file.
Can I pull a permit online?
St. Matthews offers online filing through its permit portal. Search 'St. Matthews KY building permit portal' to access the system. Not all project types are available online — complex commercial projects or anything requiring detailed plan review may need to be filed in person. Check the portal to see if your project type is supported. Even if you file online, you'll receive inspections and final sign-off through the city's normal schedule.
What if I skip the permit?
Unpermitted work is cited by the city during routine inspections, when a neighbor complains, or when you try to sell the house (title companies and lenders often require a permit history). St. Matthews will issue a violation notice requiring you to either demolish the work or submit a retroactive permit and pay a penalty fee (typically 1.5× the original permit fee). Unpermitted electrical or plumbing work can be cited by state inspectors, resulting in fines and orders to hire a licensed contractor to bring the work up to code. If the work is structural (deck, addition, foundation) and fails inspection after the fact, removal costs can run many times the original permit fee. The 3-4 week wait for a permit is worth it.
Ready to file for your St. Matthews permit?
Start by calling or visiting the St. Matthews Building Department to confirm the current address, phone number, and online portal status. Have your project details ready: the scope of work, estimated cost, lot size, and property address. Ask about the fee estimate and whether your project qualifies for over-the-counter same-day approval or requires full plan review. Most routine residential permits move through in 2-3 weeks if the application is complete. Bring or submit a site plan showing property lines, setbacks, and the location of your project, plus any relevant detail drawings (footing depth for decks, roof pitch for roofing, egress window dimensions for basements). If you're hiring a contractor, verify their Kentucky license before you file.