Corridor Notes · Permits & Plan Review
Two projects can involve the same drawings, the same contractor and the same 1,200 square feet of work, and be billed on two completely different numbers. The difference is one word on the application: alteration, or change of occupancy. Kentucky prices an alteration on the part you touch. It prices a change of occupancy on the entire building.
That single classification is the largest swing in the plan review line of a Lexington commercial budget, and the buyer almost never chooses it. The published rates behind both paths are in 815 KAR 7:120, the regulation that adopts and prices the Kentucky Building Code, last amended effective December 3, 2024 under the authority of KRS 198B.040(7), 198B.050 and 198B.260.
What is the difference between an alteration and a change of occupancy?
An alteration changes a building without changing what it is used for. A change of occupancy changes the use group the building is classified under, which re-opens the code for the whole structure.
The practical consequence shows up in the fee base, not in the fee rate. For alterations and repairs not otherwise covered by the schedule, 815 KAR 7:120 says the plan review fee “shall be calculated by using the lower result” of two calculations — the cost of the alterations or repairs multiplied by 0.0030, or the area actually being altered priced at the per-square-foot figure the schedule lists for that occupancy type. Either way, the number you multiply is small and local to the work.
For a change of use the regulation reads differently: “Plan review fees for existing buildings in which the use group or occupancy type is changed shall be calculated in accordance with the schedule listed in Table 121.3.1” — and that calculation runs on the total square footage of the entire building or structure under the new occupancy type, measured by outside dimensions. The regulation also sets a floor: the minimum fee for review of plans is $285. The published per-occupancy rates are broken out in our note on Kentucky state plan review fees for Lexington commercial buildings.
| Classification | What gets multiplied | 1,200 sq ft of work inside a 40,000 sq ft building |
|---|---|---|
| Alteration / repair | Lower of: cost of work × 0.0030, or altered area × schedule rate | Priced on 1,200 sq ft (or on the cost of the work) |
| Change of use group or occupancy type | Total square footage of the entire building under the new occupancy | Priced on 40,000 sq ft |
Nothing in that table is a cost estimate. It is the same project, priced against two different denominators — and the denominator is what the classification decides.
You do not negotiate the classification. You discover it — and on a building you have not closed on yet, you can discover it before you are the one paying for it.
Who decides whether your Lexington project is a change of occupancy?
The code official with jurisdiction does. In Fayette County that is Lexington’s building inspection authority, not the owner, the architect or the contractor, and not the seller.
Lexington’s own description of the office is short and worth reading literally. Building Inspection states that its “goal is to ensure safe construction of projects by enforcing the Kentucky Building Code” — enforcing, not interpreting alongside you. The edition in force locally is published on LFUCG’s current building codes page, and the statewide licensing and code apparatus behind it sits with the Kentucky Department of Housing, Buildings and Construction, which describes its role as enforcing “statewide standards for building construction.”
This is why the question belongs in diligence rather than in the permit queue. The classification is a call someone else makes about the building you are buying, using facts that already exist — what the space was legally occupied as, and what you intend to do in it. Both halves are knowable before an offer is firm.
Which existing uses turn a simple build-out into a change of occupancy?
The risk concentrates where a building’s last legal use is not the use everyone assumes it had. Warehouse space converted to offices, retail turned into assembly or food service, and anything becoming daycare or medical are the recurring ones.
- Storage or warehouse space being finished out as offices — the use group changes even if the shell does not.
- Retail space becoming a restaurant, bar, event room or church — occupant load and assembly classification are the trigger, not the kitchen.
- Any space becoming daycare, medical or residential — these carry their own occupancy groups and the most consequential code deltas.
- A building whose last permitted use ended years ago, where nobody in the transaction can produce a document naming it.
What should a buyer collect before the classification is someone else’s call?
Three documents settle most of it: the last certificate of occupancy or permit naming the use, the intended use in writing, and the square footage of the entire structure by outside dimensions.
A note on how this plays out in practice, as a matter of craft rather than any one deal. Buyers tend to price the work and leave the permit line as a rounding error, because on a lease build-out it usually is. On a change of use it is not a rounding error, and it is the only line in the budget that gets bigger when the building gets bigger — which inverts the instinct that a larger building is the safer buy. The cheapest moment to ask the question is while the seller still has an interest in answering it. Once you own the building, the same question costs the same money and you are asking it alone.
It also travels with the other things that attach to a building rather than to a transaction. A property carrying an open municipal problem is a separate diligence lane worth reading alongside this one — see our note on a code enforcement lien on Lexington commercial property.
Does a change of occupancy always mean the whole building has to be brought up to current code?
Not automatically, and the scope question is separate from the fee question. The fee base for a change of use is the whole building under 815 KAR 7:120; what physical work is required is determined by the code official applying the adopted code to your specific change. Treat them as two answers from the same office, and get both in writing.
Can the seller tell me what the building is classified as?
A seller can tell you what it was used as, which is useful but is not the same thing. The document that matters is the one the jurisdiction issued — a certificate of occupancy or the permit record naming the use. Ask for the document, not the recollection.
Is the plan review fee the same whether the state or the local jurisdiction reviews it?
The fee schedule in 815 KAR 7:120 is the state schedule. Which projects go to state review and which stay local is a separate determination, and local permit and review charges are set locally. Confirm the review path first, then the schedule that applies to it.
Last updated: September 28, 2026. Fee-base wording, the $285 minimum and the December 3, 2024 effective date are quoted from 815 KAR 7:120 as published by the Kentucky Legislative Research Commission, read 28 September 2026. The Building Inspection and Department of Housing, Buildings and Construction descriptions are quoted from those offices’ own pages, read 28 September 2026. This is general information about published Kentucky regulations, not a code determination, a fee quote or legal advice.
By Marcos Gil, REALTOR® — Keller Williams Commonwealth · KY Real Estate License No. 296259 · Call or text (859) 310-1209.
Marcos Gil also owns Central Property Services and publishes investinthegorge.com and marcosgilrealty.com.
