Maryland ADU Builder Directory

Maryland ADU Builders Directory

Find professionals for your Maryland ADU project. Browse builders, design-build firms, architects, modular providers and other ADU professionals by county, project type and service. Review what each company says it does, what we independently checked, and where the information came from.

Browse by county Filter by project & service Evidence-labeled profiles

Project examples

See ADU work before opening a profile

These profiles include project photos or company-provided visuals, so you can quickly understand the type of work each firm handles before filtering by county and service.

Makara ADU project in Bethesda, Maryland Makara ADUProject gallery available PurBilt Modular ADU project in Maryland PurBiltCompany-provided project photos Capital ADU completed 900-square-foot detached backyard ADU in Washington, DC Capital ADUCompleted and in-progress project imagery

Start with your project location. Choose a county, then narrow the directory by professional type, ADU type and service. A listing is not an endorsement; use the profile evidence to build your shortlist.

Get project help

LOCAL KNOWLEDGE. A MORE INFORMED CHOICE.

Select your county or Baltimore City to find ADU professionals who report serving that area. Listings distinguish verified information from self-reported information.

EXPLORE MARYLAND23 counties + Baltimore City
Allegany CountyAnne Arundel CountyBaltimore CityBaltimore CountyCalvert CountyCaroline CountyCarroll CountyCecil CountyCharles CountyDorchester CountyFrederick CountyGarrett CountyHarford CountyHoward CountyKent CountyMontgomery CountyPrince George’s CountyQueen Anne’s CountySomerset CountySt. Mary’s CountyTalbot CountyWashington CountyWicomico CountyWorcester County

Choose an area on the map or use the selector above.

County outlines: Maryland iMAP, SHA & DoIT. Service areas are not zoning boundaries.

YOUR LOCAL DIRECTORY

Start with your area

Public listings · Alphabetical order · Inclusion is not an endorsement

Refine your search

Choose a county to see who serves it.

How the Maryland ADU Builder Map works

Choose the county where your project is located, narrow by professional or ADU type, then open a profile to review service claims and their sources. A company's office location alone does not establish its service area.

What “verified” means

Verification describes information checked against evidence, not workmanship. Self-reported and company-published claims are labeled separately. Expired checks no longer display as currently verified. Confirm current licensing before hiring.

Choosing an ADU professional

Compare relevant project experience, scope, references, insurance and current credentials. Compare builders, prefab and delivery methods, then confirm your zoning and permit authorities.

Independent directory disclosure

A listing is not an endorsement, warranty or guarantee of performance, and is not architectural or legal advice. Verify licensing, insurance, references and qualifications for your project before hiring.

Homeowner or ADU professional?

Homeowners can share a project for help building a shortlist. Maryland professionals can ask us to review their business for possible inclusion in the independent directory.

Get project help Request a listing review

YOUR NEXT PRACTICAL STEP

What to do next

Start by finding the office that reviews your property. A mailing city or a county guide does not establish your parcel’s authority.

  1. Find Who Reviews My Property.
  2. Obtain your parcel identifier, survey, floor plans and utility records.
  3. Ask the reviewing office which current rules, supporting documents and approvals apply.
  4. Continue to your planning workspace.

Enable JavaScript to prepare a downloadable next-step brief. Planning guidance is not permit approval.