Meet the Founder
Founded by Spenser McCoy in 2025, OneBuild was born from a lifelong belief that design and construction should work together to make people’s lives better. At a young age, his grandfather introduced him to the world of architecture and he was captivated by buildings - not just how they looked, but how they felt. He saw spaces that didn’t work for the people inside them and dreamed of finding a better way - one that was thoughtful, human, and lasting.
That vision grew into OneBuild - a company built to simplify and reimagine how people add space to their lives. From feasibility and permitting to design and installation, OneBuild handles every step under one roof, delivering clarity, accountability, and care. No hidden costs. No confusion. Just one seamless process that turns ideas into spaces that feel like home always putting the client first.
Rooted in the Hudson Valley, OneBuild helps homeowners build modern prefab ADUs and backyard homes that are sustainable, profitable, and personal. Whether you’re creating a space for multigenerational living, added income, or independence, our mission remains the same - to use design as a tool for change, solving real problems, and creating beauty with purpose.
Spenser McCoy
Founder
One Team. One Process. OneBuild.
ABOUT US
We Build For People
At OneBuild, we make adding space simple. We help homeowners create beautiful, functional spaces that generate value and enhance daily living.
We are not just builders or designers, we are your problem-solvers and partners. Our team manages every step including feasibility, design, permitting, and installation all under one clear process. No hidden fees. No confusion. Just quality results, built to last.
Rooted in the Hudson Valley, we believe great design should be accessible, profitable, and personal. Whether you’re building for family, guests, or income, OneBuild delivers modern prefab solutions that bring clarity, comfort, and confidence home.
One Team. One Process. OneBuild.
OUR SERVICES
We handle everything - from feasibility and permitting to design, delivery, and installation. Our ADU process removes confusion and hidden costs, giving you a single, transparent path from concept to completion.
One team. One process. OneBuild.
EXPERIENCE
Our team brings expertise in architecture and construction, delivering spaces that are beautiful and durable. Every detail is vetted ensuring your ADU is designed to last and built to impress.
Professional design. Real results.
ACCOUNTABILITY
We stand behind every project we build. From permits to final inspection, we take pride in our work, value communication, and follow timelines - so you never have to chase someone on your team again.
Trust earned through clarity and craftsmanship.
OUR MISSION
Redefining the Way People Build
At OneBuild, our mission is to simplify the way people create space. We believe that building should be inspiring, not overwhelming and that everyone deserves access to beautiful, functional, and sustainable homes.
By integrating design, engineering, permitting, and delivery into one seamless process, we remove the barriers of traditional construction and make it easy for homeowners to add meaningful value to their properties. Whether it’s a guest house, rental unit, or personal retreat, our ADUs are crafted to bring comfort, flexibility, and long-term opportunity to every client.
We’re redefining what it means to build by blending architectural design, honest craftsmanship, and modern efficiency through one trusted team, one process, and one build.
Our goal is simple: to make high-quality prefab housing accessible, sustainable, and profitable, empowering homeowners and communities to build smarter, live better, and shape the future of housing - one backyard at a time.
One Team. One Process. OneBuild.
