Before You Build in Philadelphia, PA: Permit & Rule Checklist (2026)

No zoning permit is needed for a fence at or below the Zoning Code limits; exceeding them requires a permit and a ZBA appeal. A building permit is required for non-masonry fences over 6 feet and masonry fences over 2 feet, and is always required on historic-register or floodplain properties.

Philadelphia Property Maintenance Code §PM-303 requires all pools, hot tubs, and spas with water deeper than 24 inches to be enclosed by a barrier at least 48 inches high. Gates must be self-closing and self-latching. The Philadelphia Residential Code Appendix G provides additional barrier design specifications.

Where a fence sits on top of a retaining wall in Philadelphia, the combined height of the exposed retaining wall plus the fence may not exceed the maximum height permitted for a fence in that location.

On residentially zoned Philadelphia property, a fence between the street and the building may be no more than 4 feet tall and no more than 50% opaque; elsewhere on the lot it may reach 6 feet. Commercial lots allow up to 8 feet behind the building line.

A Philadelphia building permit is required to install most in-ground and above-ground pools and spas; small prefabricated pools under 24 inches deep and under 5,000 gallons are exempt, and accessory one-family pools can use a no-plans EZ permit if they meet the L&I conditions.

Every Philadelphia pool, spa, or hot tub must be restricted by one of three approved barrier options, the standard being a 48-inch-high enclosure with a self-closing, self-latching gate that swings away from the pool.

Above-ground pools in Philadelphia are subject to the same barrier and safety requirements as in-ground pools under §PM-303. Pools with water deeper than 24 inches require a 48-inch barrier. The zoning code does not permit pools in front or side yards, and pools must be at least 2 feet from any property line.

Hot tubs and spas in Philadelphia must comply with §PM-303 safety requirements. Units with water deeper than 24 inches need a 48-inch barrier with self-closing, self-latching gates. Hot tubs with an ASTM F 1346 compliant safety cover are exempt from the barrier requirement. Electrical work requires an L&I permit.

Philadelphia permits accessory dwelling units (ADUs) only on lots in the RSA-5 or CMX-1 base zoning districts (and certain overlay districts), under Zoning Code Section 14-604(11). The ADU must be inside the principal building or inside a detached accessory building (such as a detached garage) that already existed as of the Code's effective date, be no larger than 800 square feet, be limited to one per lot, and the owner must occupy either the principal or accessory unit.

Philadelphia does not have a standalone garage-conversion ordinance, but a detached garage is the prime candidate for an accessory dwelling unit under Zoning Code Section 14-604(11): an ADU may be located inside a detached accessory building such as a detached garage that already existed as of the Code's effective date, in the RSA-5 or CMX-1 districts, up to 800 sq. ft., owner-occupied. Converting a garage to any new use is a change of use requiring a use registration permit.

Philadelphia exempts a small shed from permits only when it is 120 sq. ft. or less, no taller than 15 ft. (one story), located in the rear yard, and accessory to a one- or two-family dwelling - per L&I Permit Guide PG_011 and the Zoning Code. A shed in a front or side yard, or larger than 120 sq. ft., requires a zoning permit, and a shed over 200 sq. ft. requires both a zoning and a building permit.

Philadelphia does not have specific tiny home regulations. Accessory dwelling units (ADUs) are permitted under §14-604(11) but must be within an existing principal building or existing detached accessory building. New freestanding ADU construction is not permitted by right. Tiny homes on wheels may be classified as RVs under §12-919.

Carports in Philadelphia are regulated as accessory structures under Phila. Code §14-604. They must be constructed in conjunction with or after the principal structure, comply with setback and height limits for the applicable zoning district, and obtain a zoning and building permit from L&I. In residential districts, they are typically permitted in side and rear yards.

Philadelphia permits portable outdoor fireplaces (patio fireplaces, chimeneas) only when they meet the safety conditions set out in Department of Licenses and Inspections (L&I) Code Bulletin F-0602 R1. They must be fully enclosed with a spark-arresting screen, kept at least 15 feet from any structure, used only with clean wood/charcoal/propane fuel, and constantly attended until extinguished.

Open burning is broadly prohibited in Philadelphia. The Air Management Code (Section 3-202) bans open fires except for outdoor home cooking (barbecue cooking), and the Fire Code (Section 307) prohibits open burning unless specifically approved by the fire code official. Pennsylvania air-quality regulation 25 Pa. Code Section 129.14 independently restricts open burning statewide.

Philadelphia Parks & Recreation has exclusive control of all street trees under Philadelphia Code Section 15-203. A private owner may trim, prune, or remove the street tree abutting their property only after obtaining a permit from the Department, and any contractor doing tree work must hold a Department permit, sign an indemnification agreement, and carry liability insurance. Violations carry a minimum fine of $300 per day.

Philadelphia has no permanent calendar or odd/even lawn-watering schedule. Outdoor irrigation is generally unrestricted, but during a Commonwealth drought emergency the Governor of Pennsylvania may prohibit watering lawns, gardens, shrubs, washing vehicles, and filling pools, as the City's Office of Emergency Management explains.

Under Philadelphia Code Section 14-705(1)(e), heritage trees on a development lot may not be removed unless the applicant replaces them per the tree-replacement standards or obtains a Zoning Board special exception. Healthy trees 2.5-inch DBH or larger removed during development generally must be replaced so the total caliper of replacements equals the total caliper removed.