A building community.



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

Williams College

Private Residential Clients



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

DEAP Energy Group

Downing Engineering

Energy Balance


FCM Smart Build

Gifford Engineering

GNCB Consulting Engineers

Hal Cutler, PE

HB Fishman

HLB Lighting

Horsley Whitten Group

Kohler & Lewis Engineering

Landmark Structures

LN Consulting

MacRostie Historic Advisors

Morgan Studio

Naomi Miller Lighting

New Ecology Inc.

Petersen Engineering

PV Squared

Right Environments

Ryan Hellwig, PE

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


Harry Grodsky &amp 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

The MacMillian Company

Waterman Excavation

Western Builders

Whittier Heating and Plumbing

Wright Builders



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

New England Chapter of the AIA

The American Society 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.

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, like our own Andrew Webster.

Architecture 2030

C&H is a participating firm in the Architecture 2030 Challenge. We submit documentation on the performance of our built projects to assist in the development of a rubric for green building best practices.



Garland Mill Timberframes

Hudson River Design

RetroFuture Remodeling

Zero Energy Design