ADU Builder & Accessory Dwelling Unit Contractor in Maryland
Expert ADU builder in Maryland. Coalition Construction designs and builds accessory dwelling units in Anne Arundel County. Call (410) 431-1892 for a free estimate.
ADU Builder & Accessory Dwelling Unit Contractor in Maryland
Accessory dwelling units — commonly called ADUs, guest houses, carriage houses, or in-law suites — are among the most financially rewarding investments a Maryland property owner can make. Coalition Construction is an experienced ADU builder serving Anne Arundel County and surrounding Maryland communities. We design and construct high-quality secondary living spaces that generate rental income, accommodate multigenerational families, and increase your property’s long-term value.
The demand for ADUs in Maryland has grown significantly in recent years, driven by rising housing costs, shifting family structures, and increasing interest in passive income through property. Coalition Construction helps homeowners navigate the regulatory landscape, design a unit that maximizes their property’s potential, and build an ADU that is safe, code-compliant, and genuinely valuable.
What Is an Accessory Dwelling Unit (ADU)?
An accessory dwelling unit is a self-contained living space located on the same property as a primary residence. ADUs include their own kitchen or kitchenette, bathroom, sleeping area, and typically their own entrance. In Maryland, ADUs can take several forms:
- Detached ADUs — freestanding cottages, guest houses, or carriage houses on the same lot
- Attached ADUs — additions to the primary home with a separate, private entrance
- Garage conversions — transforming an attached or detached garage into a livable unit
- Basement apartments — converting a finished basement into an independent dwelling
- Above-garage units — constructing a second-story apartment above a detached or attached garage
Our ADU Construction Process
We evaluate your lot's ADU eligibility under Anne Arundel County or applicable local zoning regulations
We develop a floor plan optimized for your property layout, goals, and budget
Full permit acquisition and county approval management
Foundation work, utility connections, and access preparation
Expert build from framing to final finishes, using quality materials throughout
All required county inspections and a thorough final walkthrough
Why Build an ADU in Maryland?
- Generate passive monthly rental income to offset your mortgage or supplement your income.
- Create comfortable, private living space for aging parents or adult children.
- Add a dedicated space for a home business, studio, or office.
- Increase your property’s overall market value and appeal.
- Provide private guest accommodations without a hotel.
- Benefit from Maryland’s growing demand for accessory housing.
ADU Construction Cost in Maryland
- Garage conversion ADU: $60,000 – $120,000
- Basement apartment ADU: $50,000 – $100,000
- Attached ADU addition: $90,000 – $160,000
- Detached ADU / guest house: $100,000 – $230,000+
Costs vary by size, type, and finishes. Contact Coalition Construction for a free, site-specific estimate.
FAQs
Yes. Anne Arundel County permits ADUs in most residential zones, subject to specific requirements regarding lot size, setbacks, parking, and unit size. Coalition Construction is well-versed in local ADU regulations and will assess your property's eligibility during the initial consultation.
Yes. ADUs in Maryland can be legally rented as long-term residences when properly permitted. Short-term rental regulations vary by jurisdiction. We build every ADU to meet residential rental standards, and we recommend consulting your local authority for current short-term rental policies.
ADU projects in Maryland typically take 4 to 9 months from permit approval to completion. Garage conversions and basement ADUs may be completed faster. Detached new-construction ADUs typically take longer. We establish a clear timeline at the project start.
Ready to Get Started? Contact Coalition Construction Today!
- Phone: (410) 431-1892
- Email: coalitionllcmd@gmail.com
- www.coalitionconstruction.com
Call now for a FREE estimate — no obligation, no pressure!
ADU Service Areas in Maryland
- ADU Builder in Pasadena, MD
- ADU Builder in Severna Park, MD
- ADU Builder in Arnold, MD
- ADU Builder in Annapolis, MD
- ADU Builder in Davidsonville, MD