Modular accessory dwelling unit

Looking for modular accessory dwelling unit in Washington, DC? Call AccessoryDwellingUnit Experts for a contact a provider — no obligation. Licensed adu builders serve Washington 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 is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.

About this service

These units are built in a factory setting and then transported to your property for final assembly. This option is often chosen to reduce construction time and minimize disruption to your neighborhood. The final price is influenced by transport logistics, site preparation, and the level of customization. Exact pricing confirmed free on the call.

Frequently asked in Washington

How can I get an ADU quote in Washington D.C.?

To get an ADU quote in Washington D.C., call us directly. We will arrange for a professional to visit your property. They will assess the site and discuss your needs. Based on this, we provide a comprehensive quote. This quote covers design, permitting, and construction.

What kind of ADU housing options are there?

ADU housing options include detached backyard units, attached additions to the main house, and garage conversions. Each offers different advantages in terms of space, privacy, and cost. We can help you determine the best ADU housing option for your Washington D.C. property.

Are prefab ADUs a good option for D.C. residents?

Prefab ADUs, built off-site, can be a viable option in Washington D.C. They can sometimes offer faster construction times. Site access and delivery logistics are key considerations. We can assess your property to see if a prefab ADU is a practical choice for you.

What are the requirements for ADU financing?

ADU financing requirements vary by lender. Many homeowners use home equity loans, personal loans, or construction loans. Some specific ADU grants might be available. We can discuss the potential costs involved. This helps you explore your financing options.

What is an ADU unit?

An ADU unit is a secondary, independent living space on a residential property. It can be attached to or detached from the main house. ADUs are designed to provide complete living accommodations. They are a practical solution for adding rental income or family housing.

What are accessory dwelling unit grants?

Accessory dwelling unit grants are sometimes available to help offset construction costs. These are typically offered by local or state governments. Eligibility and availability vary. We can provide information on potential grant programs if they are relevant to your project.

Where can I find accessory dwelling unit builders near me?

Also serving nearby: Alexandria · Baltimore · Richmond · Reading · Philadelphia

All cities in District of Columbia →

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

Service area details

678,972residents

11,107per sq mile

8ZIP codes served

Serving all of Washington — population 678,972; about 11,107 residents per square mile across 61.1 sq mi. ZIP codes covered include 20001, 20002, 20003, 20004, 20005, 20006, 20007, 20008.

Neighborhoods served in Washington: Capitol Hill, Georgetown, Adams Morgan, U Street Corridor, Dupont Circle, Alexandria — and every surrounding area.