About
Foldstone Modular
Foldstone Modular builds factory-made ADUs in Richmond, California, for Bay Area backyards. Every unit is framed, wired, plumbed and finished indoors, inspected under California's factory-built housing program, then trucked and craned onto your foundation in a single day. Pick a floor plan and finish package online, and your local contractor handles the foundation and utility hookups. Factory build time is 10 to 12 weeks.
3 offerings
Prefab & Modular Homes
Factory-Installed Solar Kit
Rooftop solar sized for a Foldstone ADU and installed in the factory, so it arrives ready to connect. A 3.2 kW array with microinverters meets California's solar requirement for new detached ADUs in most cases. Your electrician makes the final utility connection on site. Add a home battery for backup power during outages.
$11,800.00
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Prefab & Modular Homes
One-Bedroom Modular ADU, 640 sq ft
A factory-built one-bedroom home with a separate bedroom, a full bathroom, an open kitchen and living room, and space for a stacked washer and dryer. Built in our Richmond factory in 10 to 12 weeks, state-approved as factory-built housing, then set on your foundation by crane in one day. Price covers the finished unit delivered within 75 miles of Richmond; foundation, utility hookups and permits are separate.
$232,000.00
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Prefab & Modular Homes
Studio Modular ADU, 420 sq ft
A factory-built studio with a full kitchen, a walk-in shower, vaulted ceiling and a wall of glass doors to the garden. Built indoors in our Richmond factory in 10 to 12 weeks, state-approved as factory-built housing, then delivered and set by crane in one day. Price covers the finished unit delivered within 75 miles of Richmond; foundation, utility hookups and permits are separate. Choose your finish package at checkout.
$164,000.00
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FAQs
Q: What is included in the unit price?
The finished unit with kitchen, bathroom, flooring, fixtures, windows, heat pump and water heater, delivered and set by crane within 75 miles of Richmond. Foundation, utility trenching, permits and site work are separate.
Q: Do your units need a separate city plan check?
The unit itself is approved by the state as factory-built housing, so the city reviews only the foundation, site plan and utility connections. That usually shortens plan check by several weeks.