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O'Sullivan Architects

O'Sullivan Architects is an architecture firm north of Boston, dedicated to working closely with clients to help them realize their project goals, and we’ve done so for over twenty-five years. OSA prides itself on our versatility, as we are capable of taking on a multitude of project types and locations, ranging from small home additions to large multifamily developments and commercial projects.

Whether it’s designing functional, livable and beautiful spaces, navigating often complex municipal approval processes, designing for LEED certification, or coordinating with a multitude of engineers, consultants and contractors, our breadth of experience helps for a positive result for our clients.

The process of selecting an architect can sometimes be daunting, and we try to maintain a close working relationship with our clients to ensure that client input is understood, appreciated and above all, listened to.  This is essential to making our projects successful for our clients, and why we love what we do.

The Brook - Street view


Riverway Townhomes


Residential - Multifamily

Scituate, Massachusetts

170 West Broadway



Boston, Massachusetts

Michaels Landing


Residential - Multifamily

Lynnfield, Massachusetts

The Postmark


Mixed Use

Reading, Massachusetts

Salem Station - Amenity Building



Salem, Massachusetts

The Brook



Cambridge, Massachusetts

O'Sullivan Architects

O'Sullivan Architects is a full-service architecture firm based in New England. We specialize in residential and commercial projects, from historic restorations to modern designs. Our team is dedicated to providing exceptional service to our clients, while also incorporating sustainable and innovative practices in our work.

OSA Main Office
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