Smithtown, NY Building Safety: Plumbing Permits (2026)

Section 112-10(E) requires anyone obtaining a building permit to simultaneously submit, in writing, a detailed drawing showing the exact number and location of each plumbing fixture and heating unit to be installed, and to obtain a separate permit from the Chief Building Inspector for this purpose. 20%, a health-based cap the Town enforces at the permit stage. Fees for the plumbing permit are set out in § 112-11: residential work is billed at $55 for the first two fixtures and $29 for each additional fixture, while commercial plumbing permits cost $290 for the first two fixtures and $35 for each fixture beyond two.

A related gas-pressure test, often required when new fixtures tie into a gas line, costs $115 per meter per test residentially and $290 per meter commercially. All fees are due to the Building Department at the time of application, and § 112-11(A) specifies that no permit or certificate will be issued until every applicable fee has been paid in full. Because the plumbing permit is tied to the underlying building permit application under § 112-10, the same general application requirements, land description, valuation, owner and applicant information, apply before the Chief Building Inspector will process either permit.