Backyard accessory dwelling unit

Looking for backyard accessory dwelling unit in Philadelphia, PA? Call AccessoryDwellingUnit Direct for a contact a provider — no obligation. Licensed adu builders serve Philadelphia and the surrounding area, and you'll get straight answers on timing and what affects the price.

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

This is a detached living space built on your property, separate from your main home. People typically choose this option when they need a private office, a guest suite, or a separate place for family members to stay while maintaining distance from the primary house. These units use existing yard space to add square footage to your property without an addition to the main structure. Exact pricing confirmed free on the call.

Frequently asked in Philadelphia

How much does it generally cost to build an accessory dwelling unit in Philadelphia?

What permits are usually needed for an ADU in Philadelphia?

What are some local ADU options for Philadelphia residents?

What's the general cost of an accessory dwelling unit in Philly?

The cost of an accessory dwelling unit in Philly is influenced by design and materials. Factors like foundation work, utilities, and finishes matter. It's important to get a personalized quote. This will reflect the specifics of your property in the city. We can help you get that quote. Call us today.

Are there any grants for accessory dwelling units in Philadelphia?

What kind of housing is an ADU?

An accessory dwelling unit (ADU) is a second, smaller living unit on a single-family residential lot. It's a separate dwelling with its own kitchen, bathroom, and sleeping area. ADUs can be attached to or detached from the main house. They offer flexible housing solutions for families or as rental income. We can help you find pros to build one.

What is the approximate cost of an accessory dwelling unit?

Also serving nearby: Trenton · Allentown · Reading · Elizabeth · Newark

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

1,550,542residents

11,540per sq mile

8ZIP codes served

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: Fishtown, Old City, Rittenhouse Square, Germantown, West Philly, South Philly — and every surrounding area.