01
Steel Fabrication
Custom structural and miscellaneous steel — engineered, welded, and installed to spec.
Commercial Specialists · NYC & Westchester
Built on strength.
Driven by purpose.
Thessa Construction LLC delivers steel, concrete, masonry and structural work for commercial projects across New York City and Westchester County.
Licensed
& Insured
NYC + Westchester
Service Area
Commercial
Focus
Woman
Owned
01 — Who we are
A construction company built around craft, structure, and trust.
Thessa Construction is a Yonkers-based commercial contractor serving developers, property owners, and institutions throughout the five boroughs and Westchester County. From custom steel fabrication to full structural renovations, every project is led with precision, accountability, and a relentless standard for quality.
02 — Capabilities
Full-scope construction, executed in-house.
Seven core disciplines. One accountable team. We self-perform the work that defines a building's strength.
02
Masonry
Brick, block, and stone construction with a craftsman's attention to detail.
03
Concrete
Foundations, slabs, footings, and decorative concrete poured to exacting tolerances.
04
Structural Renovation
Reinforcement, restoration, and adaptive reuse of aging commercial structures.
05
Parking Garages
New builds and full-scale restoration of multi-level parking structures.
06
Commercial Metal Rooms
Purpose-built metal rooms and enclosures for commercial use.
07
Stone & Tile Work
Precision stone and tile installation for lobbies, facades, and high-traffic interiors.
Need something specific?
Yonkers, NY
Headquarters
03 — Leadership
A founder-led firm with skin in every project.
Thessa Construction LLC was founded to bring a higher standard to commercial building in the New York metro area — one rooted in disciplined craftsmanship, transparent communication, and an unwavering commitment to safety.
— Julia Tsesmetzis, Founder & Owner
That hands-on leadership is why our clients keep coming back: structural integrity, schedule integrity, budget integrity. Every time.
Yonkers, NY
Headquarters
NYC + Westchester
Service Area
Commercial
Project Focus
04 — Where we build
Serving all of NYC and Westchester County.
From Manhattan high-rises to commercial sites across Westchester, our crews are mobilized across the metro area — Manhattan, Brooklyn, The Bronx, Yonkers, and every municipality in Westchester County.
Manhattan
Brooklyn
The Bronx
Yonkers
White Plains
New Rochelle
Mount Vernon
Scarsdale
Greenburgh
All Westchester
05 — Start a project
Let's talk about what you're building.
Send project details, drawings, or a quick scope. The Thessa team will get back within one business day.