In my little town, sprayfoam urethane has been a popular option for insulating new homes. Expensive, but four foamers compete for the business, and the going rate is about $0.60/bf.
Used to be we would complete all mechanical rough ins before a foam up, but no more. The building department now has decided no electrical wiring can be buried in foam, so now we can do some of the rough ahead of foam, but not all. Wiring in walls or roofs that are to be foam-insulated must be done afterward, and the sparkies hate chopping that stuff.
How is it where you are?
Gene Davis, Davis Housewrights, Inc., Lake Placid, NY