September 2025 Home of the Month: Custom Sag Harbor Ranch

Manufacturer: Signature Building Systems
Location: Sag Harbor, New York
Square Footage: 1,800 sq. ft.
Stories: 1 
Bedrooms: 3
Bathrooms: 3.5

The Custom Sag Harbor Ranch is a striking example of how modular construction can achieve both efficiency and elegance. Manufactured by Signature Building Systems, this 1,800 sq. ft. ranch-style home was designed in three modules and placed on a 9-foot basement foundation, which adds significant finished living space, including an additional bedroom and bath.

Design & Features

The design is based on Signature’s popular Poppy modular ranch floor plan but was fully customized to meet the homeowner’s unique preferences. A vaulted ceiling with skylights highlights the open-concept kitchen and great room, creating a bright, airy atmosphere that blends functionality with high-end style.

Attention to detail can be seen throughout the home. Hardwood flooring and floor-to-ceiling tile finishes elevate the interiors, while Andersen 400 Series windows and a large patio door provide abundant natural light. A bold fireplace serves as a central focal point in the living room, adding both warmth and modern appeal.

Expanded Living Space

The 9-foot basement foundation nearly doubles the available square footage, offering an additional 1,800 sq. ft. of living space. This finished lower level includes a bedroom, bath, and flexible areas for entertainment or storage.

Outdoor Connections

Exterior features include Hardie board siding and a back deck that flows directly into a pool area. This seamless indoor-outdoor connection makes the Custom Sag Harbor Ranch ideal for both relaxation and entertaining.

Modular Benefits

By combining precision engineering, factory-built efficiency, and onsite customization, the Custom Sag Harbor Ranch demonstrates the possibilities of modern modular construction. The result is a residence that delivers on performance, comfort, and timeless design—all while showcasing the advantages of modular building methods.