Premier Residential Builders Who Understand Design
Custom Home Building & Renovations in Greater Boston
Streamline Builders is a residential construction firm based in Brookline, Massachusetts, specializing in custom renovations, additions, and new construction throughout the Greater Boston area. Our work is rooted in close collaboration with architects, designers, and homeowners to translate thoughtful design into beautifully built spaces.
With more than 50 years of combined experience in residential construction, our team brings deep technical knowledge and a meticulous approach to every project. From complex renovations in historic homes to new construction tailored to modern living, we focus on delivering exceptional craftsmanship and a seamless building process.
A Builder’s Perspective
Streamline Builders is led by Alex Harwin and Jason Jagentenfl, whose careers are rooted in decades of hands-on construction experience.
Alex, originally trained as an architect, brings a strong design perspective and works closely with architects and designers to ensure each project is executed with precision and intent.
Jason began in the trades over 25 years ago and has led multimillion-dollar custom home projects across California and Boston, and is known for his leadership, coordination, and commitment to quality.
Together, they combine design insight with expert craftsmanship to deliver thoughtful, well-executed homes.
Our Approach
Much of our work comes through referrals from architects and designers who trust us to execute their vision with precision.
We believe the best projects are built through collaboration. From early planning through final construction, we work closely with design teams and clients to ensure every detail is thoughtfully executed.
With a trusted network of skilled tradespeople and a commitment to clear communication, we deliver a seamless building experience—focused on craftsmanship, coordination, and lasting results.
