Costello Construction

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Sam M

Costello Construction has been a strong and reliable partner across the projects we’ve completed and been awarded together — including the Chesapeake Analytic Collaborative Building, the North Laurel Swimming Pool Addition, The Heights Building Phase II Parking Garage, the Patrick Henry Library, and the Dewey Beach Police Department. Their team is smart, professional, and genuinely easy to work with. They take the time to dive into the small details, ensuring every scope item is accurate and well-coordinated before execution. With their years of experience in the industry, they understand the process, communicate clearly, address issues quickly, and treat subcontractors fairly. Most importantly, they are honest and pay on time — consistently. Working with Costello has been a positive and dependable experience, and we look forward to continuing that partnership on future projects.

Howard Chamber

We couldn’t be happier with our new office on the Columbia Lakefront, thanks to Costello Construction! Their team went above and beyond to deliver a space that is modern, upscale, and perfectly tailored to our needs. The finished product has already made a huge impression on our staff and visitors. We are truly grateful for their partnership and proud to have them as members of the Howard County Chamber of Commerce.

Myra Wight

We’ve worked with Costello Construction on several jobs and it’s always been a good experience. Their team is easy to work with, they stay on top of schedules, and the quality of their work speaks for itself. We’d have no problem recommending them to anyone looking for a reliable GC. --The Nexus Company

E “EazyE” D

Great general contractor—professional, dependable, and easy to work with. Projects run smoothly, communication is clear, and the work always gets done the right way. Definitely a reliable team.