Accessory dwelling unit services — Philadelphia, PA
Last updated: September 24, 2026
What affects the price
Building an ADU involves variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.
About this service
Frequently asked in Philadelphia
How much does it cost to build an ADU in Philadelphia?
What permits are needed for an ADU in Philadelphia?
What's the most expensive part of building an ADU?
Can I get a modular ADU in Philadelphia?
Who are the best ADU contractors in Philadelphia?
What's the difference between an ADU and an in-law suite?
Also serving nearby: Trenton · Allentown · Reading · Elizabeth · Newark
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Philadelphia — population 1,550,542; about 11,540 residents per square mile across 134.4 sq mi. ZIP codes covered include 19019, 19092, 19093, 19099, 19101, 19102, 19103, 19104.
Neighborhoods served in Philadelphia: Center City, West Philadelphia, South Philadelphia, Fishtown, Germantown, Mount Airy — and every surrounding area.
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