Building community.



Private Residences

Amherst College

Beacon Communities

Boston Community Capital

Colgate University

College of the Atlantic

Crotched Mountain Farm

The Harris Center

Hawthorne Valley Farm

Historic Deerfield

Housing Assistance Corporation

Lawrence Community Works

Mass Audubon Society

Mt. Holyoke College

The Natural Dharma Fellowship

Olson Kundig Architects

Peabody Properties

Quabbin Regional School District

Rocky Hill Cohousing

Smith College

Solidago Foundation

South Mountain Company

The Trustees of Reservations

University of Massachusetts, Amherst

Williams College



Garland Mill Timberframes

Hudson River Design

Kent Hicks Construction

RetroFuture Remodeling

South Mountain Company

Zero Energy Design




Agricola Corporation

AKF Group


B2Q Associates

Barry Engineers & Constructors

Bartlett Design

Berkshire Design Group

Berkshire Photovoltaic Services

Bruss Project Management

BVH Integrated Services

Camroden Associates

Conceptual Lighting

Coplon Associates

CSL Consulting

Hal Cutler, PE

DEAP Energy Group

Energy Balance


Gifford Engineering

GNCB Consulting Engineers

HB Fishman

Hallam, ICS

HLB Lighting

Horsley Whitten Group

Kohler & Lewis Engineering

Landmark Structures

LN Consulting

MacRostie Historic Advisors

Naomi Miller Lighting

New Ecology Inc.

Petersen Engineering

Power House Energy Consulting

PV Squared

Right Environments

Rybak Engineering

Sage Design

Shepherd Engineering

Shepley Bulfinch

Solar Design Associates

Starr Interiors

Structures North

SW Cole

VanZelm Engineers


Whetstone Engineering


Aalanco Service Corporation

Allegrone Construction

Bebee Construction

Celluspray Insulation

Daniel O’Connell’s Sons

Eckman Construction

EL Shea Builders and Engineers

Elm Electric


FCM Smart Build

Harry Grodsky & Co.

Heartwood Group

Holden Builders

Integrity Construction

Kent Hicks Construction

Keiter Builders

Landmark Structures

Milestone Engineering & Construction

MJ Moran

RL Whipple

Sano Rubin Construction

Scapes Builders & Excavation

Teagno Construction

Thayer Street Associates

The MacMillian Company

Two Storey Builders

Waterman Excavation

Western Builders

Whittier Heating and Plumbing

Wright Builders



The value of our collaboration with NESEA is evidenced by the broad network of professional colleagues that bring depth and joy to our practice. In fact, Bruce and Tom met through NESEA and this organization is at least in part responsible for the genesis of Coldham & Hartman Architects

American Institute of Architects (AIA)

Thomas RC Hartman is the New England representative of the AIA Strategic Council 2020, which advises the Board of Directors on the overall goals of the Institute.

New England Chapter of the AIA

The American Institute of Architects is a professional organization that fosters engagement within the building professions and between architects and the wider community. Thomas RC Hartman, principal at C&H is former president of the New England AIA.

Western Massachusetts Chapter of the AIA

The local chapter of the AIA hosts many enrichment and networking events for architects in the Pioneer Valley and surrounding communities. Garth is the chapter Treasurer and a member of the Executive Committee.

Passive House Institute US

Passive House is a rigorous performance standard for energy efficient building. The Passive House Institute US hosts an annual conference, provides certification for buildings and products, and training for professionals to become Certified Passive House Designers and Consultants.

Architecture 2030 & the AIA 2030 Commitment

C&H is a participating firm in the Architecture 2030 Challenge¬†and signatory firm of the AIA’s 2030 Commitment. We submit documentation on the performance of our built projects to assist in the development of a rubric for green building best practices.

Embodied Carbon Network

We have become members of the Embodied Carbon Network with the goal of increasing our capacity and understanding of the importance of embodied carbon in our buildings. As we have decreased operational carbon, and as the clock ticks on atmospheric carbon, the analysis and understanding of design decisions and the resulting carbon impact (or drawdown) becomes critical.