These are the plants that build whole rooms: three-dimensional boxes with floors, walls and ceilings, often shipped with drywall, finishes and plumbing already in. They fit buildings made of repeated, room-sized spaces, like hotels, apartments, dorms and clinics. The schedule case is strong, since the factory builds while the site crew pours the foundation; cost savings are less certain, as we cover in our cost and schedule guide. Call a plant once your design is close to locked, because production slots get booked months ahead.
The list below: 6 companies, described in their own words.
Volumetric Building Companies
Volumetric multifamily, hospitality and student housing manufacturer. vbc.co ↗
FullStack Modular
Steel-frame volumetric modular for high-rise and mid-rise. fullstackmodular.com ↗
A manufacturer that hesitates here is telling you something.From How to vet a modular manufacturer
Guerdon
Multifamily and affordable housing modules from its Idaho plant. guerdonmodular.com ↗
DMD Modular
Commercial and residential volumetric modular builder. dmdmodular.com ↗
Triumph Modular
Permanent modular buildings for education and commercial use. triumphmodular.com ↗
WillScot
Modular space and portable storage leasing at national scale. willscot.com ↗
Is this your company? Correct or upgrade your listing.
Last checked October 2026. Order is editorial. Paid placements are labeled and never change the order. How we list.
Photo: Cheung Yin / Unsplash
Photo: Jan van der Wolf / Pexels
Photo: Cemrecan Yurtman / Pexels
Photo: Pexels contributor / Pexels