Modular accessory dwelling unit

Looking for modular 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

A modular ADU is built in a climate-controlled factory and then transported to your property for assembly. You would choose this route if you want a faster build time and less construction mess in your yard compared to traditional on-site building. Prices fluctuate based on customization options, transportation distance, and site preparation needs. These units are efficient, but the foundation must be ready before delivery. Exact pricing confirmed free on the call.

Frequently asked in Philadelphia

What's the deal with ADU permits in Philly?

How much does an ADU cost in Philadelphia?

What exactly is an accessory dwelling unit?

An accessory dwelling unit, or ADU, is a second living space on a single-family home lot. Think of it as a small, separate apartment. It can be attached to the main house or detached. ADUs are great for extra income or family.

Can I get an ADU built quickly in Philadelphia?

While some ADU projects can move quickly, timelines vary. The pros aim to be efficient. Factors like permit approvals and material availability affect speed. Discuss your desired timeline when you call for an estimate.

Who are good accessory dwelling unit contractors?

Are homes with in-law suites common?

Homes with in-law suites are becoming more popular. An ADU is essentially a modern in-law suite. They offer independence for elderly parents or adult children. They can also be rented out for income. Adding one can be a smart investment.

What makes a 'best' accessory dwelling unit?

The 'best' ADU is one that fits your needs and budget. It's well-built, functional, and adds value. The pros focus on quality construction. They ensure your ADU is a great addition to your Philadelphia home.

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, South Philly, West Philly, Germantown, Northern Liberties, Old City — and every surrounding area.