KOSL Building Group is a Mamaroneck-based general contractor delivering custom homes and large-scale residential projects. The firm emphasizes transparent communication, detailed execution, and a coordinated build process from preconstruction through closeout.
- Clear, consistent communication from start to finish- Careful budgeting and scheduling coordination- Detail-focused craftsmanship and clean job sites- Experience with high-end materials and complex builds- Local knowledge of municipalities and permitting
Serving Mamaroneck and greater Westchester County, including Rye, Larchmont, Harrison, Scarsdale, and White Plains, with select projects in Greenwich, CT.
Custom homes, luxury new construction, major additions, whole-home renovations, design-build coordination, construction management, site planning, permitting support, energy-code compliant construction, and finish carpentry/detail work.
Reviews frequently mention strong communication, with homeowners noting regular updates and clear expectations. Many point to detailed craftsmanship and thorough project management from planning through completion. Clients also reference professionalism, responsiveness, and a smooth custom home process. Overall ratings suggest consistent satisfaction with both quality and coordination.
The KOSL group is best in class, offering high quality service and full transparency through the whole process. Their attention to detail is second to none. Throughout the process they took care of us as if we were part of their own family. They are one of a kind and the people you want by your side when building your home. We highly recommend them to anyone looking to build their dream home!
KOSL built my custom home in Rye and I couldn’t be happier. They were very professional and worked tirelessly to make my home perfect. Throughout the process, they communicated constantly and clearly every step of the way. Their vision and commitment is unmatched!
Working with this team has been an absolute pleasure. As builders, designers, and architects, they bring an exceptional level of skill and professionalism to every project. Their homes are built to meet energy codes and are impressively strong and well-crafted. The staff is knowledgeable, friendly, and truly dedicated to delivering high-quality results. I highly recommend them to anyone looking for reliable, talented experts in the industry.
After searching for the right builder for years, we are thankful to have chosen KOSL for our recently completed dream home. From start to finish they were there every step of the way and surpassed our expectations. Building a custom home is an intricate process, choosing the right builder is imperative. Highly recommend the KOSL team!
KOSL building group is by far the most prestigious firm I’ve hired for real estate development. They provided the finest quality of detail in their work. I came across KOSL after seeing them on the “Today’s Builder TV Show”, where I felt as though I truly got to know Bobby and Oran.I look forward to working with this company again and continue to recommend it to all of my friends and colleagues!
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