THRESHOLD LANDSCAPE ARCHITECTURE, LLC is a full-service landscape architecture firm.  We design spaces that evolve from careful observation of the natural characteristics of a site, and thoughtful attention to the client’s perceptions of the property, desires for its development, and budget.  We create distinctive landscapes that connect the places where architecture and landscape meet, and bring clarity to spaces throughout the property and the view beyond.

Our work is a balance of creative vision and technical expertise.  Drawing inspiration from landscape attributes and architectural forms inherent to the property, we produce innovative designs founded on a profound respect for the natural environment. 

We encourage collaboration with the client throughout the design process, and strive to create spaces where the elegant combination of all elements contributes to the enjoyment of vibrant and meaningful landscapes.


Regina O’Brien has been designing large and small landscapes for 25 years.  Her interest in the design process was first developed as an undergraduate student, when she studied painting and sculpture at Bard College.  

A Registered Landscape Architect in Connecticut and New York, Regina earned a Masters of Landscape Architecture at the University of Pennsylvania.  She is a member of the American Society of Landscape Architects, and serves on the Planning Commission for the Town of Redding.  She has lived with her family in Redding since 1994, and continues to be inspired by the surrounding landscape.


2018 Connecticut Chapter of the American Society of Landscape Architects Merit Award Landscape for Walking, Gathering, and Listening to Music Redding, CT.

2019 Finalist At Home Magazine “A-List Awards”


Site Selection and Analysis

Master Planning

Schematic Design

Construction Documentation

Construction Observation

Stormwater Management

Plans for Permitting and Regulatory Approval