Builder Directory

Haven ADUs specializes in designing, permitting, and constructing detached backyard accessory dwelling units exclusively for New York City homeowners, offering a full-service model that consolidates design, Department of Buildings filings, and construction management under a single point of contact. The company tailors each project to its specific lot and site conditions rather than relying on standardized plans, and handles the complete process from zoning analysis through certificate of occupancy. Haven offers four product sizes—Studio, Medium, Large, and X-Large—with units positioned to generate rental income, provide family housing, or serve as home office space in a market where backyard ADUs are now permitted.

This second-generation family-owned design/build firm operates across Los Angeles and Orange County, offering ADU conversion and construction alongside broader home remodeling services including kitchen and bathroom renovations, pools, and hardscaping. Katz Design & Builders emphasizes a collaborative approach that balances client input with expert guidance, managing projects from design through completion with on-site oversight and transparency. The company distinguishes itself through its commitment to combining quality materials with cost efficiency while maintaining high construction standards throughout every phase.

Second Key provides comprehensive ADU services to New York City homeowners, offering full-service solutions that span feasibility assessment, design, permitting, and construction from initial planning through Certificate of Occupancy. The company differentiates itself through its end-to-end project management approach, financing assistance with ADU-familiar lenders, and a streamlined workflow featuring pre-designed unit options alongside custom configurations, with typical projects reaching move-in readiness within six months of permit approval. Second Key's free ADU assessments serve as the entry point for NYC property owners seeking to understand their specific site constraints and development potential.

This New York-based modular home manufacturer specializes in fully customizable residential units across multiple architectural styles, from ranches and colonials to townhouses and multi-unit rental properties. The company distinguishes itself through factory-controlled construction that allows simultaneous foundation and home building, significantly accelerating project timelines compared to traditional stick-built methods. Westchester Modular works with builders, developers, and individual homeowners, offering either pre-designed plans or complete custom design services in collaboration with architects.