Building permits, zoning and septic rules in Lehigh County, Pennsylvania

Yes. An owner or authorized agent in Lehigh County must obtain a permit before constructing, enlarging, altering, repairing, moving or demolishing a residential building, changing its occupancy, or doing regulated electrical, gas, mechanical or plumbing work¹⁰. Ordinary repairs and several listed projects are exceptions, and emergency work may begin if the application follows within 3 business days¹⁰.

The statewide Uniform Construction Code applies in Lehigh County, with enforcement by the municipality, a certified third-party agency or, in opt-out situations, the Department of Labor & Industry^1,2. The 2018 I-Code regulations took effect February 14, 2022, and the 2025 triennial update has an effective date of January 1, 2026, so ask the building code official which edition applies to your project².

Inspections cover residential building construction and changes, electrical, gas, mechanical and plumbing work, and pools and hot tubs¹. The permit holder must tell the code official when work is ready for stage and final inspections¹⁰. A residential building cannot be occupied without a certificate of occupancy issued after a compliant final inspection^1,10.

Qualifying agricultural buildings with no habitable space are excluded from the Construction Code Act, though other local and state rules may still apply¹¹.

Start with the township, borough or city governing the Lehigh County parcel to identify the UCC building-permit issuer; municipal, certified third-party and Department jurisdiction depend on local enforcement arrangements^1,7. Of the places we checked, Heidelberg Township handles its own building permits, while on-lot sewage questions go to the township's Sewage Enforcement Officer^12,13. Use the county municipality directory to identify the local government¹⁴. Request the administering municipality or third-party agency's public fee schedule for plan review and inspections¹⁵. Where the Department of Labor & Industry issues the UCC permit, its published standard fee for new buildings and additions is $414.49 plus $0.84 per square foot or fraction; local fees may differ¹⁶. Department fees cover plan review and inspections, with additional charges for expedited review or inspections outside normal hours¹. The state UCC office answers code-administration questions at 717-787-3806 or uccbois@pa.gov¹.

Lehigh County has no authority over zoning laws; zoning requirements are administered by the township, borough or city where the parcel lies^3,7. The city of Allentown has its own zoning chapter in its code of ordinances⁴. Heidelberg Township administers its own zoning; on-lot sewage matters remain with its Sewage Enforcement Officer^5,13. In unincorporated Lehigh County, we could not confirm county zoning minimum lot sizes, setbacks or minimum dwelling sizes; municipal zoning, subdivision and land-development rules may impose those requirements³. Ask the parcel's municipality about permitted uses, setbacks, minimum dwelling size, lot coverage, building height, RV occupancy and tiny-home siting⁷. Septic stays separate from municipal zoning: on-lot sewage permits come from the local sewage agency, which may serve several municipalities⁶. Subdivision rules require a separate check: a municipal subdivision and land-development ordinance controls where one exists, while a county ordinance may apply where the municipality has none¹⁷. Use the county municipality directory to identify the correct government before relying on a listing description or designing a project¹⁴.

The applicable local agency handles on-lot septic permitting and enforcement in Lehigh County through Sewage Enforcement Officers^6,18. Local agencies issue permits for retaining tanks and individual or community on-lot systems, subject to exceptions such as large-volume systems⁶. A limited exemption can apply to an individual system serving an owner or immediate-family residence on a contiguous tract of at least 10 acres, but only under specific ownership-date, siting and notification conditions¹⁹. After installation, the system cannot be covered until the permit issuer approves it, or until 72 hours pass after notice that the work is complete, whichever comes first²⁰. Only 17.8% of Lehigh County's mapped soil is rated free of severe limits for a conventional septic drain field, so arrange a site and soil evaluation before committing to a parcel⁹. Use the state's directory to find the active Sewage Enforcement Officer serving the municipality²¹.

In unincorporated Lehigh County, we could not confirm a county zoning rule for RV or tiny-home occupancy, but that does not mean municipalities allow either: township, borough and city zoning, building-code, sewage and floodplain rules may still restrict occupancy³. We could not confirm one Lehigh County rule that authorizes living in an RV or tiny home on private land, so ask the township, borough or city zoning officer about the exact parcel and proposed use⁷. A tiny home used as a dwelling must follow the UCC permit, inspection and occupancy process when the work is regulated, while local zoning may control siting, minimum size and setbacks^1,7,10. Manufactured housing has specialized UCC treatment, but the state rule does not resolve local siting or utility approval²². Before buying, get the municipality's answer on occupancy and placement and ask the applicable local or joint local agency about wastewater service^7,18.

1. Identify the municipality governing the parcel through the county's boroughs and townships directory¹⁴.
2. Ask that municipality about zoning, setbacks, proposed use and the appropriate UCC building-permit issuer^1,7.
3. Arrange the site evaluation and required on-lot sewage permit through the applicable local sewage agency⁶.
4. Obtain the issuer's fee schedule, submit required plans and specifications, and receive the building permit before regulated work begins^1,15,23.
5. Obtain the municipality's floodplain development permit before work in a Special Flood Hazard Area; a driveway connecting to a state highway also needs a PennDOT Highway Occupancy Permit^24,25.
6. Notify the code official when work is ready for inspections and obtain the certificate of occupancy before using the home^1,10.

Soils: 17.8% of Lehigh County's mapped soil is rated free of severe limits for a conventional septic drain field, so have the local Sewage Enforcement Officer evaluate the specific lot before purchase^6,9. Flood: a Pennsylvania municipality must issue its own floodplain development permit before work can begin in a designated Special Flood Hazard Area, so check your parcel against your township or borough's floodplain ordinance before you buy²⁴. Access: a driveway or road connecting to a state highway needs a PennDOT Highway Occupancy Permit from District 5, usually issued within about 30 days when the application is complete^25,26. Water: a homeowner or farmer can drill their own well without the commercial driller's license Pennsylvania requires for well-drilling companies, though the state sets construction standards only for public water-supply wells, not private ones²⁷. Taxes: Lehigh County's typical effective property tax rate is 1.7% of value, with a median annual property tax bill of about $4,591⁹.