Custom ADU Builders In Maryland

Create extra living space for family, guests, or rental income with a custom-built ADU, in-law suite, or carriage house anywhere in Maryland.

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Your Maryland Specialists for Custom ADU's & In-Law Suites

If you’re looking to expand your living space, an Accessory Dwelling Unit (ADU) — also known as an in-law suite, carriage house, or even a tiny home — offers a versatile solution that blends comfort, function, and long-term value. At Clarksville Construction, we design and build fully equipped secondary living spaces tailored to your property and needs.

Whether you want a private apartment for family, a charming rental cottage for extra income, a compact tiny home for downsizing, or a detached guesthouse for visitors, we provide expert craftsmanship and a seamless design-build process. Our team manages everything from permits and zoning to construction and finishing, ensuring your project meets Maryland’s building codes and enhances your property’s appeal.

We proudly serve homeowners throughout Maryland, delivering custom home additions that maximize your space while complementing your home’s style.

Maximize Your Space and Investment

Custom Design & Flexible Layouts

From spacious in-law suites to compact tiny homes, we create floor plans that fit your property, style, and lifestyle. Every detail is tailored to your vision.

Turnkey Design-Build Service

We manage the entire process — design, permits, construction, and finishing — so you can enjoy a stress-free experience from concept to completion.

High-Quality, Energy-Efficient Materials

Built to last with durable construction and modern energy-saving features, your ADU will stand the test of time while keeping utility costs low.

Maryland Building Code Expertise

Our team knows local zoning laws, HOA guidelines, and state regulations, ensuring your project is compliant and approved without costly delays.

Our 4-Step Process for Building Your ADU or In-Law Suite

Consultation

We start with a free on-site consultation to discuss your vision, budget, and property layout. Whether it’s an ADU, carriage house, tiny home, or in-law suite, we’ll explore the best approach for your space.

Design

Our design team creates a detailed plan that matches your needs and meets Maryland building codes. From modern layouts to traditional styles, every element is customized to fit your goals.

Construction

We handle all permitting and approval processes with local authorities, then move seamlessly into construction. Our team delivers quality craftsmanship, energy-efficient materials, and precise execution

Quality Assurance

Once your new space is complete, we review every detail with you, address any questions, and make sure you’re 100% satisfied with your new ADU. Our work is backed by warranties for lasting peace of mind.

Ready to Add an ADU to Your Property?

Areas We Serve

Mainland Maryland

Clarksville
Baltimore
Hyattsville
Pasadena
Laurel
Glen Burnie
Annapolis
Jessup
Highland
Ellicott City
Elkridge
Fulton
West Friendship
Hanover
Columbia
Silver Spring
And Many More, Contact Us To See If We Serve Your Area

Eastern Shore / Delaware

Bishopville
Ocean City
Newark
Cedartown
Salisbury
Bethany Beach
Dewey/ Rehoboth Beach
Millsboro
Selbyville
And Many More, Contact Us To See If We Serve Your Area

See What Our Maryland Clients Have To Say

      EXCELLENT  
   Based on 238 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Linda B 
 
 
 
 Trustindex verifies that the original source of the review is Google. Can't say enough about Clarksville Construction and their whole team who replaced all our windows and redid our bathroom and powder room.  Working with Jack (sales), Mark (project manager), and Mikel (project coordinator) was a joy.  They were in constant communication and were so responsive.  All the workers were so professional, kind, and their attention to detail was spot on.  They even moved the schedule up to accommodate us hosting a large party at the house!  Let's face it...living in a home that is undergoing construction is not easy but they did a fantastic job cleaning up every single day and did everything possible to mitigate the dust and disruption to our lives. We are so grateful to each person who worked with us on this project and highly recommend them to anyone looking for a contractor.
  
 
      Posted on Google  
   
   Zach Decker 
 
 
 
 Trustindex verifies that the original source of the review is Google. Clarksville Construction recently completed a remodel of our master bathroom. We were impressed by Clarksville Construction’s foreman Marco and his team. They were knowledgeable, professional and respectful of our home. They were dedicated to making sure that everything was done to our satisfaction. Our bathroom is beautiful now.
  
 
      Posted on Google  
   
   Kathleen T 
 
 
 
 Trustindex verifies that the original source of the review is Google. Storm and Jose did a marvelous job repairing the steps to my front porch. They also repaired my storm door and the framing around it. Finally, they replaced my mailbox that had been damaged by a winter storm. They investigated the stairwell problem to my deck and recommended the concrete slab be replaced. Throughout the entire process, they kept me informed of everything they were doing and made suggestions along the way. They are such great representatives of Clarksville Construction. Thank you!
  
 
      Posted on Google  
   
   Mark Shearer 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had a great experience with Clarksville Construction. Matt Thompson was a fantastic representative to work with and he stood by every step of the way and ensured communication through the whole project. His team came in and replaced an external door and frame and every step from beginning to end was completed.
  
 
      Posted on Google  
   
   Carole Reb 
 
 
 
 Trustindex verifies that the original source of the review is Google. had the storm door installed. they came back and had the door close completely when leaving my home. the only thing they couldn't fix was the bottom of the door. My neighbor's niece's boyfriend was installing her storm door when I told him about the bottom of my storm door. he unscrewed the two screws at the bottom and slid down the panel strip. Worked wonderful. One Happy Camper!!
  
 
      Posted on Google  
   
   Dranna White 
 
 
 
 Trustindex verifies that the original source of the review is Google. Doug came to our home, he called ahead of arriving.  He was friendly and professional.  He educated us on many aspects of upgrading.  I appreciated the fact that he was detailed in his explanation of the process.  He listened to what we had to say then he took measurements, photos, and made diagrams and notes for creating his bid.
  
 
      Posted on Google  
   
   SHEILA Shaw 
 
 
 
 Trustindex verifies that the original source of the review is Google. After almost 30 years it was time for some home upgrades. We contacted Clarkesville construction for a complete remodel of the master bathroom, new siding, new interior railings, and new attic insulation. From our initial meeting with Tom McHale through the final walk through with Randall Rill, everything went very well, and Madelin Sagastume kept everyone coordinated from back in the office. They connected us with Brigid Wethington at B. Chic Interiors who was a great help with the design. During construction they protected other areas of the home such that there was no mess outside the construction area. The crews were friendly, polite and came on schedule. Everthing was left clean and tidy at the end of each day. The quality of the work done was outstanding with great attention to detail. From grout seams to stain and painting there were no shortcuts taken. The tile, counters and vanity were beautifully installed. Any issue we noticed was immediately resolved. The siding and gutters went on just before the bad weather in January which was much appreciated. It made our house look new! It was a big project but was completed in about 4 months and we are very pleased with the outcome.