Your Backyard Has Potential

By Spenser McCoy

Every week, someone in the Hudson Valley has a version of the same conversation.

It starts over dinner. Maybe a parent mentioned their knees aren't great anymore. Maybe the guest cottage idea has been floating around for a few years. Maybe someone did the math on short-term rental income and suddenly the backyard looks a lot more interesting.

The idea lands: What if we built something back there?

Then they Google it. Then they get overwhelmed. Then they do nothing.

This is for those people.

What We're Actually Talking About

An ADU — accessory dwelling unit — is a self-contained residential unit on the same property as your primary home. It goes by a lot of names: backyard home, backyard cottage, in-law suite, carriage house, granny flat. In the Hudson Valley, where properties tend to have the land and the need, ADUs are having a genuine moment.

Modern prefab ADUs have changed the game significantly. Factory-built structures arrive with better construction tolerances than most site-built alternatives, faster timelines, and increasingly, real design quality. We're not talking about a shed with a Murphy bed. We're talking about 600 to 1,200 square feet of thoughtfully designed, energy-efficient living space — often delivered and installed in weeks rather than months.

The economics are real. A well-placed ADU in Ulster, Dutchess, Orange, or Sullivan County can generate $1,500 to $2,800 per month in long-term rental income, or serve as a permanent home for a parent who isn't ready for assisted living — and doesn't need to be.

Why Hudson Valley Homeowners Are Building Them

The two reasons we hear most:

• Family. An aging parent who wants independence but needs proximity. An adult child who moved back and never quite left. A multigenerational household that needs space.

• Income. Hudson Valley rental demand is strong, and it's not going away. A permitted, code-compliant ADU on a residential lot is a long-term asset. One that tends to increase property value, not just monthly cash flow.

The Part Nobody Talks About

Here's where most online content about ADUs fails you.

The prefab brochure shows a beautiful structure in a lush backyard. The price sounds reasonable. You think: I have a backyard. I have a budget. Let's go.

What the brochure doesn't mention:

• Zoning varies dramatically by municipality in New York State. What's allowed in the Town of Woodstock is not necessarily allowed in the Town of Montgomery. Some municipalities have embraced ADU-friendly zoning. Others haven't updated their codes since the 1980s.

• Setback requirements are non-negotiable. Your structure needs to clear your property lines by a specific distance — and that distance varies by zoning district. A lot that looks spacious can have less buildable area than you'd expect.

• Septic is often the deciding factor. In rural counties, municipal sewer is the exception, not the rule. Adding a dwelling unit means adding to your septic load. Your existing system may or may not support it. This is the question that kills more projects than any other — and it's the first one worth answering.

• Utility connections add cost and timeline. Electric, water, potentially gas — each has its own process, its own contractor, and its own waiting period.

None of this means don't build. It means know what you're building into before you start spending money.

What a Feasibility Study Actually Is

A feasibility study isn't a grand architectural document. It's a clear-eyed answer to a simple question: Can we actually do this on your specific property, under your specific local regulations, for a number that makes sense?

At OneBuild, our feasibility study covers zoning and setback analysis, site constraints, utility considerations, septic evaluation guidance, and a preliminary project budget range — before you've committed to a design, a manufacturer, or a contractor.

It takes the guesswork out. And if the answer is yes, it becomes the foundation for everything that comes next.

If the answer is no — or not yet — you've saved yourself from a significantly more expensive mistake.