Cosmo Builders

Home Builders Contractor – Excellent Experience Cosmo Builders did an amazing job on our new home building single family house from start to finish. If anyone ask me who is the best home builders in McLean and Fairfax, I always say Cosmo Builders. They handled design, permits, construction, inspections, and occupancy permit without any stress for us. The team really explain everything in simple words, like what permits are needed, how long construction takes, and what inspections must be pass. Communication was very clear and helpful, even for someone who never build a house before. We loved the open kitchen concept, high ceiling, and the custom large windows from floor to ceiling. The house feels very bright and modern. Materials quality was excellent: quartz countertops, Shaiker style c

We worked with Cosmo Builders for our home addition project in Tyson corner and overall the experience was really good. They are honestly one of the best home builders in Fairfax County we came across. From design and permits to construction and inspections, everything was complete in the right way. I and my partner really liked their details estimates, scope of work and easy process. The new addition has an open layout with a large room and custom large size Andersen windows. The material quality was great, and they matched our existing exterior siding very well. The addition looks modern and also feels like it was built at the same time as the original house, not like something added later. What we appreciated most was the clear pricing. They gave us a realistic base estimate with fai

Cosmo Builders recently completed a second-story addition and bump-out for our home, and overall it was a really good experience. From start to finish, the team was on-site often, very attentive, and always focused on finding solutions when something came up. Throughout the project, they helped us stay close to our budget and shared design ideas when we weren’t fully sure what direction to go. The designer worked closely with us and made sure our ideas were understood. We felt like it was a real collaboration and not rushed. The project stayed on schedule during the major phases, which allowed us to move back into our home when we needed to. That was a big relief. The construction quality is solid, the new spaces feel open and well built, and everything flows nicely with the rest of the

We are very happy with the deck project done by Cosmo Builders. They replace our old deck and build a new composite deck using Trex material with composite railing. The new framing and structure feel very strong and good build. The process was easy, price was fair, and the team listen to what we want. Work area was clean most of the time and the job move smooth. Now the deck look great and we use it all the time. We would recommend Cosmo Builders for Trex decking, composite railing, and deck replacement work.

We had a great experience working with Cosmo Builders on a full basement renovation. Our basement was closed off and broken into small sections, and they completely transformed it into an open recreation space with a bar and gym. From the first meeting to the final walkthrough, everything was organized and handled professionally. During the design and planning phase, the Cosmo Builders team and the designer guided us through the process with regular meetings and vendor visits. The project included demolition, structural changes, and a full rebuild, which was stressful at first, but the team made it feel manageable and smooth. Once construction started, the project moved along well. We received regular updates, and the on-site management did a good job coordinating the different trades an