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Expert guides, zoning updates, and everything you need to know about building an ADU in New York City.

NYC ADU Sprinkler Requirements: What They Cost and How to Avoid Them

Basement and cellar ADUs in NYC require a full NFPA 13D sprinkler system costing $20,000-$60,000. Here's what you need to know — and how a detached backyard ADU avoids this entirely.

By NYCADU TeamMarch 22, 2026

How Much Does It Cost to Build an ADU in NYC? Full 2026 Breakdown

NYC ADU costs range from $85K to $650K depending on type, size, and site conditions. Here's a detailed breakdown of every cost category — construction, permits, design, sprinklers, and financing options.

By NYCADU TeamMarch 22, 2026

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