A Builder Who Speaks Your Language
Formal architectural training and decades of building experience inform every project we undertake. We understand your drawings, your intent, and what it takes to bring a meticulously designed project to life — without compromise.
The Challenge
The wrong builder can undermine everything.
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Builders who don't understand architectural drawings misinterpret details, make substitutions without consultation, and cut corners you'll discover only at closeout.
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When the GC goes silent, you spend hours chasing updates, fielding client calls you can't answer, and managing situations that should never reach you.
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When drawings require clarification or existing conditions reveal new challenges, we don't wait for issues to become delays. We take the initiative to develop solutions, sketch details, and work with the architect to maintain momentum while protecting the overall vision.
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Spectacular drawings deserve equally spectacular execution. Mediocre finishes and shoddy details diminish the work you've put into a project — and your reputation.
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Vague estimates and surprise change orders put you in the middle. Your clients blame the project — and sometimes, they blame the design.
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Too many builders disappear after final payment, leaving your clients — and you — with punchlist items and no one to call.
Why Streamline
Built differently. On purpose.
Streamline Builders was founded on the belief that the best homes emerge from builders and architects working as true partners — not adversaries. Our process is designed around the design. We're proud that much of our work comes directly through referrals from the architects and designers who've trusted us with their most demanding projects.
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Co-founder Alex Harwin holds a master’s degree in architecture and spent five years working in architecture firms. That foundation enables us to navigate the most intricate, large-scale residential designs—partnering with top-tier architects to ensure every detail is executed without compromise.
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Detailed estimates before we break ground. Monthly budget updates and bi-monthly invoices with full documentation and receipts — no surprises and an open book.
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Regular client site meetings with clear agendas. Ongoing dialogue with your design team throughout every phase — we reach out, you don't have to chase us.
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We’re continually learning and engaging with net-zero, Passivhaus, and Pretty Good House principles. We collaborate with building science experts to explore sustainable solutions tailored to each project.
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We remain a resource long after project closeout — ensuring your clients' homes continue to perform and that your relationship with them stays protected.
You're not just hiring a builder. You're gaining a collaborator.
With over 50 years of combined construction experience, our principals bring something rare to every project: the ability to see it from both sides of the table.
Alex Harwin
Co-Founder — Architecturally Trained
With a master’s degree in architecture and years working in respected architectural firms, Alex brings a deep understanding of design and construction. He collaborates seamlessly with design teams, translating complex plans into built reality with precision and respect for intent. And as someone married to an architect, Alex’s life—both professionally and personally—is shaped by a commitment to thoughtful design.
Jason Jagentenfl
Co-Founder — 25+ Years in the Trades
Jason has led multimillion-dollar custom home projects across California and Greater Boston. His deep trades background and leadership on complex builds means scheduling, coordination, and quality control are never an afterthought — they're baked into how he works.
A clear process, built for collaboration.
From the first conversation to long after you've handed over the keys, every phase of our process is designed to keep you informed, involved, and confident in the build.
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Initial consultation to understand the project, your goals, and the full design team. Alignment starts here.
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Detailed estimating, scheduling, early coordination with consultants, and materials planning. Full clarity before we break ground.
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Meticulous site management, regular site meetings, monthly budget updates, and documented invoicing. You're never left wondering.
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Final detailing, walkthrough, thorough closeout and documentation — finished the way it was designed to be.
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We remain a resource after handoff. Your clients are taken care of — and so is your reputation.
Trusted by Leading Boston-Area Design Firms
Ready for a builder who gets it?
Detail • Quality • IntegriTy
Let’s Connect
