bbb.org - Better Business Bureau: check a builder or producer
byoh.com - Build Your Own House: owner-builder guide (on the old page)
consumerfinance.gov - CFPB: buying or building a home, loans and closing
energystar.gov - ENERGY STAR: certified new homes and efficiency
iccsafe.org - International Code Council: the building codes most U.S. towns adopt
nahb.org - National Association of Home Builders: find a builder, building basics
everlogs.com - Everlogs: concrete log-look homes (on the old page)
superiorwalls.com - Superior Walls: insulated precast concrete foundations and walls (on the old page)
superiorwallsnc.com - Superior Walls of North Carolina: precast home foundations (on the old page)
thermomass.com - Thermomass: insulation systems for precast sandwich walls (on the old page)
coreslab.com - Coreslab Structures: precast plants across North America
dukaneprecast.com - Dukane Precast: prestressed wall panels (Illinois) (on the old page)
fabconprecast.com - Fabcon Precast: insulated wall panels (formerly Kerkstra, on the old page)
hansonsilo.com - Hanson Companies: precast concrete buildings and storage (on the old page)
hausners.com - Hausner's: storm shelters and safe rooms (Oklahoma) (on the old page)
jetprecast.com - Jet Precast (Illinois) (on the old page)nitterhouse.com - Nitterhouse Concrete Products (Pennsylvania) (on the old page)
oldcastleinfrastructure.com - Oldcastle Infrastructure: precast building products (formerly Oldcastle Precast, on the old page)
vaughnconcreteproducts.com - Vaughn Concrete Products: precast storm shelters and safe rooms (on the old page)
cement.org - American Cement Association: concrete homes research
concrete.org - American Concrete Institute (ACI): concrete standards
fema.gov - FEMA: tornado and hurricane safe rooms (P-361 and P-320)
icf-ma.org - Insulating Concrete Forms Manufacturers Association: the cast-in-place alternative
nssa.cc - National Storm Shelter Association: tested shelters
pci.org - Precast/Prestressed Concrete Institute (PCI): certified plants (on the old page)
precast.org - National Precast Concrete Association (NPCA): find a certified producer (on the old page)
ready.gov - Ready.gov: tornado safety
tilt-up.org - Tilt-Up Concrete Association: site-cast concrete walls
buildingscience.com - Building Science Corporation: concrete walls, moisture and insulation
concretenetwork.com - Concrete Network: concrete ideas and contractors
dornob.com - Dornob: modern home and concrete house design ideas (on the old page)
greenbuildingadvisor.com - Green Building Advisor: efficient home design