Window Replacement Philadelphia: $300 to $1,650 + L&I Rules

National figures; we found no Philadelphia-specific window price. L&I adds a $3 city and $4.50 state surcharge to any permit.

Do you need a permit to replace windows in Philadelphia?

Not for most houses: Philadelphia says exterior window replacement with no change in size needs no permit in a one- or two-family dwelling, unless the property is historic. Other buildings, and historic houses, use an EZ permit (no plans). Every L&I permit carries a $3 city surcharge and a $4.50 state surcharge on top of the permit fee. Changing a window's size is not covered by that exemption; HomeGuide puts reframing an opening at $50 to $200 extra.

Who can do the work

Philadelphia says a licensed Philadelphia contractor must do permitted work. In an existing one- or two-family home, the work can also be done by an owner who lives there, or by a registered Pennsylvania Home Improvement Contractor who holds a Philadelphia Commercial Activity License. Ask for both numbers before you sign. Questions about permits go to 311, or 215-686-8686 from outside the city.

Historic houses and old rowhouses

Philadelphia's exemption ends at historic properties, so a house on the historic register needs a permit even for a same-size swap. Check before you order windows, since custom units are rarely returnable. The housing is far older than the U.S. median year built of 1980: the Census Bureau puts the median year built at 1949, with 83.3% of units built before 1980 and 39.9% built in 1939 or earlier.

Lead-safe work on a Philadelphia house built before 1978

With 83.3% of homes built before 1980, most Philadelphia window jobs fall under EPA's lead rule. Any company paid to disturb paint in a pre-1978 home must be lead-safe certified, and the RRP rule's small-job exemption (20 square feet or less outside) does not cover window replacement. EPA says about three-quarters of U.S. homes built before 1978 still contain some lead-based paint. Ask for the firm's RRP certificate and how it will contain dust from the old sashes and trim.

Window rules and local conditions for Philadelphia, from official city, county, state, Census and NOAA pages.

Getting the most from new windows in Philadelphia's winters

Philadelphia International averages 77.3 nights a year at or below 32 F (NOAA 1991 to 2020 normals). ENERGY STAR says certified windows lower energy bills by up to 13% on average when they replace single-pane windows; look for its label for your climate zone. If only the glass has fogged, HomeGuide prices double-pane glass replacement at $300 to $800, which can beat a new window. The federal window tax credit ended with 2025 installs, per the IRS.

More Philadelphia home repair guides

Prices by frame and type: window replacement cost. Drafts and heating: furnace repair in Philadelphia and boiler repair in Philadelphia. Leaks around a window: roof repair in Philadelphia and water damage restoration in Philadelphia. Compare window replacement in Boston and window replacement in Washington DC. Calls go to an independent company that serves your area and takes window jobs (how calls work).