Why North Shore Homeowners Are Converting Garages Into ADUs

Something is happening on Long Island's North Shore. Homeowners in Huntington, Huntington Station, Dix Hills, Commack, and Smithtown are asking the same question in growing numbers: "Can I turn my garage into living space?" We see it in the calls we get, and the search data backs it up — "renovate garage into living space" is now one of the most-searched home improvement phrases in the Huntington–Smithtown corridor, well ahead of decks, kitchens, and additions.

This isn't a trend chasing a fad. It's basic math meeting a life stage. Here's what's driving it, what a garage conversion actually involves on the North Shore, and why homeowners in the Town of Huntington have a financial head start most of Long Island doesn't.

Who Is Building ADUs on the North Shore — and Why

The typical North Shore homeowner exploring an ADU is 45 to 64 years old, owns their home outright or is deep into the mortgage, and is dealing with at least one of these situations:

• Aging parents who need to be close — but independent. Assisted living on Long Island runs $6,000 to $10,000+ per month. A one-time garage conversion that creates a private, ground-floor in-law suite pays for itself against a single year of facility costs, and keeps Mom or Dad twenty feet away instead of twenty minutes.
• Adult kids who came back. With North Shore starter homes routinely over $600,000, adult children are living at home longer. A separate unit with its own entrance, kitchen, and bath keeps the family close without anyone losing their privacy — or their sanity.
• Retirement income planning. Homeowners heading toward fixed income are converting unused garages into rental units that generate $1,600 to $2,400 per month in the Huntington–Smithtown market. That's a pension-sized supplement built from space that currently stores boxes.
• Property value. A legal, permitted accessory apartment adds 15 to 35 percent to appraised value. An unused two-car garage adds almost nothing.

The Town of Huntington Advantage: Up to $125,000 in Grant Money

If your home is in the Town of Huntington — which includes Huntington village, Huntington Station, Dix Hills, Melville, Greenlawn, Cold Spring Harbor, and the Huntington side of Commack — you have two advantages most Long Island homeowners don't:

• A dedicated Accessory Apartment Bureau. Huntington has processed accessory apartment applications for decades. There's an established path: application, inspection, approvals. You are not the test case.
• Plus One ADU grant participation. Huntington is one of only seven Suffolk County towns in New York State's Plus One ADU Program, which provides forgivable grants of up to $125,000 for creating a new accessory unit. A typical garage conversion costs $50,000 to $100,000 — meaning the grant can cover the entire project. In exchange, you rent the unit at affordable rates to an income-qualified tenant for the forgiveness period. Full Plus One grant guide here.

What about Smithtown and Commack? The Town of Smithtown allows accessory apartments under its own code but is not currently on the Plus One participating list. Commack is split — homes on the Huntington side of the line may qualify for the grant, homes on the Smithtown side won't (for now; the program expands in funding rounds). Either way, the conversion itself is buildable in both towns. We'll confirm which side of the line you're on during a walkthrough.

What a North Shore Garage Conversion Involves

A garage-to-ADU conversion is the fastest, most affordable path to a legal accessory apartment because the structure already exists — foundation, roof, walls. The work is in making it livable and legal:

1. Feasibility and zoning check. Lot size, setbacks, owner-occupancy rules, and parking requirements vary by town. This is a one-visit assessment.
2. Design and permits. Plans covering insulation, egress, ceiling height, plumbing, and electrical. In Huntington, this goes through the Accessory Apartment Bureau; in Smithtown, through the building department.
3. Construction. Framing interior walls, insulating the slab and envelope, running plumbing for a kitchenette and bath, upgrading electrical, HVAC (usually mini-splits), windows, and finishes. Typically 8 to 12 weeks.
4. Certificate of occupancy. Final inspections make it legal — which is what makes it count at appraisal and lets you rent it without risk.

Budget-wise: $50,000–$100,000 for a garage conversion, $80,000–$150,000 for an above-garage apartment, $150,000–$250,000+ for a detached build. Detailed cost breakdown here.

Town-by-Town: Where North Shore Demand Is Strongest

• Huntington & Huntington Station — the highest ADU search demand on the North Shore, and the best-positioned town: established bureau + Plus One grant. Huntington ADU guide.
• Dix Hills — large lots and big garages make it the ideal conversion candidate; part of the Town of Huntington, so grant-eligible.
• Commack — strong demand, split jurisdiction; grant eligibility depends on which town your parcel sits in.
• Smithtown — accessory apartments allowed under town code; no grant currently, but conversions still pencil out on rental income alone.
• Cold Spring Harbor & Greenlawn — smaller volume, but high home values mean an ADU adds outsized appraisal value. Cold Spring Harbor guide.

The Bottom Line

On the North Shore, an unused garage is the most undervalued square footage you own. Converted and permitted, it becomes housing for a parent, independence for an adult kid, or $19,000+ a year in rent — and in the Town of Huntington, the state may pay for most or all of the build. The homeowners moving on this now are the ones who'll have approvals in hand while everyone else is still searching "renovate garage into living space" at midnight.

At Alec's Construction, we build ADUs across Suffolk County and help homeowners navigate both town approvals and the Plus One grant application. Start with our in-law suite guide or Suffolk County ADU laws overview.