About Us

Specializing in metal craft for the architectural, design, and fine art trades

Concentric Fabrication LLC is a custom architectural and sculpture metal firm co-founded by Rob Lorenson and Derek Riley in 2012. Specializing in metal fabrication services in the niche market of highly crafted one-of-a-kind architectural metalwork. Lorenson and Riley represent over 38 years of experience in metal working trades and are able to offer a range of design , fabricating, finishing, and installation services to their customers. The 5500 square foot shop was designed around designing, fabricating and finishing sculptures of all sizes. Pieces from 3 inches tall to 35 foot tall have been produced in our humble space. Our goal is to keep as much of the processing in house to ensure the best possible quality. Staffed by professional artist, we take great pride in making sure our clients receive the best possible product.

From specialized interior hardware, to staircases, railings and fine art commissions, Concentric Fabrication provides unparalleled service and insight.

Recently Completed

Platform Stair

Nantucket, MA

Open platform stair fabricated by Concentric Fabrication LLC, with glass railing and LED lit treads. Designed by Chip Webster for a private Nantucket residence. We also constructed and installed a decorative steel ceiling truss, a large #4 stainless fireplace surround, and custom floor compass inlay. Scroll throught the photos to see how they turned out.


Click through the thumbails below to examples of our work.

Wave Rail Rhode Island

Observatory New Hampshire

Black Bronze Wrentham, MA

Wood Wrapped Platform Nantucket, MA

Coming soon

Multi Level Modern Nantucket, MA

Derek Riley Sculpture

Loft Ladder nantucket, MA

Tech Stair Providence, RI

Five Story Boston, MA

Rob Lorenson Sculpture

Platform Stair Nantucket, MA

Give us a call to discuss your project


In Process

A sampling of projects at various stages of completion.

We fabricated several features designed by Workshop/ apd, in this Nantucket home that is showcased in this months issue of INTERIORS magazine.

INTERIORS June + July 2015

"Bronze Inner Gear" a welded bronze piece by Rob Lorenson at the bottom of the stairs. Architecture by Adolfo Perez Architect, Interior Design by Sheldon Tager Associates

Design New England

This model is standing in the middle of "Sarasota Deco", a stainless piece by Rob Lorenson. It measures 192" x 192" x 60".

SCENE Magazine

Exterior painted aluminum sculpture "Red Princess" standing 108" by Rob Lorenson. Priavate residence Wellesley, MA

Design New England

Our Team

Rob Lorenson

Owner/ Operator

Derek Riley

Owner/ Operator

Gabriele Stone


Amy E. Riley

Marketing and Client Relations


Design and More

No Designer? No problem!

From private residential to expansive commercial projects, Concentric Fabrication LLC takes on all scopes. Our in house design team will work with you one on one, to help develop and bring to life your concept through digital renderings, drawings, and constructed samples. We not only work with metal, but have the knowledge and capacity to work with a multitude of materials; glass, wood, carbon fiber, stone, and concrete to name a few. Initial concepts are provided free of charge. If you would like to further develop your project with Concentric a design retainer based on the scope of work will be required. We love problem solving and have often picked up where others have waved the white flag.


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Shop: 179 Riverside Ave, Somerset MA, 02725
Mailing: 7 Coombs St, Middleboro, MA 02346
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