About Us

An Architecture Studio Built on Integrity and Vision

Founded in New York City, William Leggio Architect LLC is a full-service architecture and design practice committed to creating spaces that honor context, enrich daily life, and elevate the built environment. The studio was established with a belief in clarity of purpose, technical rigor, and timeless design language—all guided by a collaborative approach.



William Leggio, Principal Architect, brings decades of experience across private homes, commercial developments, interior renovations, and historic preservation. With a portfolio deeply tied to New York’s architectural diversity, he leads every project with a hands-on, detail-oriented mindset—ensuring each design aligns with the client’s goals and the site’s unique opportunities.

William Leggio – Architect & Founder

William Leggio is a licensed architect in New York, known for his ability to translate a client’s vision into practical, refined architecture. His design philosophy emphasizes material honesty, spatial harmony, and long-term value. He is particularly skilled at navigating New York City’s zoning code, building regulations, and landmark preservation requirements—ensuring projects move efficiently from concept to completion.



His early training involved working on both large-scale developments and small urban dwellings, giving him a broad understanding of architectural scales and user needs. Over the years, his work has spanned Brooklyn brownstones, Upper West Side renovations, retail spaces in downtown Manhattan, and modern interiors for city-based families.

Our Commitment to Clients

The firm’s relationships are built on transparency, responsiveness, and mutual respect for process. William Leggio personally oversees all phases of design and construction administration, ensuring consistent communication and accountability.

Many clients return for additional work—an affirmation of the trust and quality built into every project. From brownstone owners renovating a single level to developers reimagining multi-family units, the firm’s commitment remains the same: deliver spaces that perform, endure, and inspire.

Clients also benefit from detailed project planning, budget-conscious phasing, and strategic consultant coordination. The result is a more predictable and satisfying experience from start to finish.

A Context-Driven Approach to Design

Each project at William Leggio Architect LLC begins with understanding the surrounding context—whether it’s a historic rowhouse in Harlem or a commercial loft in Tribeca. This sensitivity to site, culture, and structure drives the design process forward with authenticity and purpose.



The firm’s work is unified by:

• A consistent pursuit of proportion and scale
• Clean lines that respect both modern and traditional forms
• Responsible material choices
• A commitment to longevity over trend

Clients are involved at every step, from schematic concepts and 3D visualizations to final material selections and coordination with engineers or consultants.

How We Work

Every project begins with a conversation—one that informs the design process and shapes the project's goals. The team believes in setting clear expectations early and maintaining alignment from initial sketches through final inspections.



This process is structured but adaptable, with regular client check-ins, visual studies, and close coordination with all parties involved. William Leggio Architect LLC brings not only technical design but also leadership and problem-solving to every stage.

Awards, Affiliations & Credentials

• Registered Architect – State of New York
• American Institute of Architects (AIA) Member
• NCARB Certified
• LEED-Aware Practices
• Experience in LPC Approvals for Landmark Properties
• Trusted by homeowners and developers across all five boroughs

FAQs About the Firm