Accessory dwelling unit companies

Looking for accessory dwelling unit companies in New York, NY? Call AccessoryDwellingUnit Experts for a contact a provider — no obligation. Licensed adu builders serve New York and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.

About this service

These companies provide end-to-end management for property owners looking to add a secondary unit. They typically offer a mix of design, permitting, and construction management services to streamline the project. You need to hire a company when you want a structured, professional approach to the entire build process rather than managing individual subcontractors yourself. They help ensure your unit is built to code, on time, and aligned with your budget goals.

Frequently asked in New York

What are the disadvantages of ADUs in New York?

Potential disadvantages include increased utility costs and a possible strain on existing infrastructure like water and sewer lines. There can also be neighborhood pushback or concerns about parking. It's wise to discuss these with the pros who understand New York's unique challenges.

How much does an ADU cost in New York?

The cost for an ADU in New York varies widely depending on lot size, construction materials, and specific neighborhood requirements. Factors like foundation work, utility connections, and interior finishes all play a role. Get a personalized quote to understand your specific project's investment.

What are the rules for ADUs in California?

California has specific statewide ADU laws designed to encourage their development, but local ordinances still apply. These rules often address minimum lot sizes, setback requirements, and parking provisions. Consulting with local experts ensures compliance with both state and city regulations.

Is an ADU allowed in Maryland?

Maryland has various regulations regarding ADUs, with rules differing between counties and municipalities. Some areas have specific zoning overlays or requirements for owner-occupancy. It's essential to verify the local zoning laws for your specific Maryland address before proceeding.

What are the rules for ADUs in California?

California's ADU laws aim to streamline the approval process and make ADUs more accessible. Key regulations often involve limiting owner-occupancy requirements and setting maximum unit sizes. Understanding these statewide mandates is the first step to planning your California ADU.

Also serving nearby: Jersey City · Newark · Elizabeth · Clifton · Yonkers

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

8,258,035residents

27,484per sq mile

8ZIP codes served

Serving all of New York — population 8,258,035; about 27,484 residents per square mile across 300.5 sq mi. ZIP codes covered include 10001, 10002, 10003, 10004, 10005, 10006, 10007, 10008.

Neighborhoods served in New York: Upper East Side, Greenwich Village, Harlem, Brooklyn Heights, Staten Island — and every surrounding area.