Do I need a plumbing permit in Kentucky?

In Kentucky it depends on the size of the job. Permits are issued locally, so the answer comes from your Kentucky city or county rather than a single statewide rule. Of the 2 Kentucky jurisdictions we have verified for plumbing work, 1 requires a permit outright, 1 depends on the size or scope of the job, and 0 require none.

Is there a plumbing permit exemption in Kentucky?

1 of the 2 Kentucky jurisdictions we cover sets a threshold rather than a flat rule, so the same job can be exempt in one Kentucky county and permitted in the next. The table above lists each Kentucky jurisdiction's published threshold in its own words, with the source and the date we verified it.

Kentucky

Do you need a plumbing permit in Kentucky?

By Mario Bailey Last checked 3 Oct 2026

Always required: 1; of 2 jurisdictions
Conditional: 1; depends on size or scope
Not required: 0; exempt outright

Plumbing Permit rules nationwide, beyond Kentucky.

A plumber tightens a fitting on water supply pipes

Requirements and size thresholds for plumbing permits vary by locality. The table below compares what each Kentucky county or city requires. Always confirm with the local office before starting.

Comparing states? See plumbing permit rules across every locality we cover.

The application steps and inspection sequence for plumbing permits come from the model code rather than from Kentucky law, so they read the same wherever you build. We keep that walkthrough in one place: how a plumbing permit application and its inspections work, start to finish. What changes between Kentucky jurisdictions is below: who requires a permit, what they charge, and which office you file with.

Swipe sideways to see thresholds and confidence.

Locality	Permit required?	Typical threshold	Confidence
Lexington	Conditional	Before new plumbing, moving or relocating a fixture or waste opening, replacing a house...	Confirmed on official page
Louisville	Yes	Any size	From an official source
No localities match your filter.

Common questions about plumbing permits in Kentucky

Do I need a plumbing permit in Kentucky?: In Kentucky it depends on the size of the job. Permits are issued locally, so the answer comes from your Kentucky city or county rather than a single statewide rule. Of the 2 Kentucky jurisdictions we have verified for plumbing work, 1 requires a permit outright, 1 depends on the size or scope of the job, and 0 require none.
Is there a plumbing permit exemption in Kentucky?: 1 of the 2 Kentucky jurisdictions we cover sets a threshold rather than a flat rule, so the same job can be exempt in one Kentucky county and permitted in the next. The table above lists each Kentucky jurisdiction's published threshold in its own words, with the source and the date we verified it.

Do you need a plumbing permit in Kentucky?

Common questions about plumbing permits in Kentucky

Ready to move on your plumbing permit?

Apply yourself

Hire it out