At the building conference last month, I spoke with a rep at ParcoHomes, a prefab start-up out of San Francisco. From what I gathered, the company plans to employ mass production techniques currently used for commercial buildings. Parts would be manufactured offshore, packaged, and shipped by sea and truck to your homesite. From the ParcoHomes website:
"We are designing, manufacturing and distributing resource efficient, modern, prefabricated homes employing a 'flat-pack' delivery approach. Our kit of parts is made up of metal-framed floor, roof and wall panels supported on a structural frame. The entire kit of parts is based on a four-foot planning module to allow for an ideal balance between constructability and flexibility."
EcoInfill is currently building the prototype of their Ei1 concept. The concept home's flexibility allows it to "be installed as a single family home, addition, or entire townhome project." I spoke with someone from Sexton + Lawton Architecture, the designers of the homes. He said that the homes will cost them ~$95/sf coming out of the factory; this translates to ~$175/sf installed. While the model home is not yet complete, they are hoping for a 3 month timeline from foundation work to move-in.
SG Blocks repurposes shipping containers for architectural purposes. Many companies building from recycled shipping containers are sourcing their product from SG Blocks. I spoke with a rep who explained that the $200/sf+ cost of building with recycled shipping containers is justified by the added strength and durability.
In addition to these prefab builders, there were a number of SIP manufacturers present. These include Alternative Building Concepts, Shimotsu Architecture and Distribution, and SIP Home Systems. I saw some interesting features, like pre-drilled mechanical chases for electrical connections.