We already built a barn style home on our property made from glue lam timbers and SIP's. We love almost everything about the building accept the cost and the issue with the roof (another topic I already responded to).

We have been permitted for a 42'x23'6" 3 car garage that is 1-1/2 stories. The building will be 25' tall approx.. The rear of the second story will probably have a long row of windows.

I will use the building for many things including a wood shop on the second story and a myriad of things in the garage space. I will need to insulate the building and heat it.

I like the SIP's for their speed of installation, no need to drywall the interior for a garage and for their sound keeping (exterior noise as well as the keeping machine tool noise in the building)

Am I crazy for wanting this building made from SIP's? Cost is an issue. Where can I find a one stop solution for the design, steel supports and installation?

No one is crazy for wanting and energy efficient structure. We design, engineer, and install structures like the one you plan on building all the time. I know that there has been a lot of talk on this site about how expensive SIP’s are but around here our bids are in line with 2x6 construction for SIP walls and truss roof. SIP roofs are an upgrade and are not a simple decision for owners but this is addressed elsewhere.

A project like yours is a simple “bread and butter” project for a firm similar to ours. An economical and energy efficient design would be nothing out of the ordinary. Unfortunately, most firms like ours do not access this site so you will be lucky to find one in your area that does. Start by calling local architects and builders and asking what they know about SIPs and green building. When you find one, ask if they do the engineering in house. Most outside structural engineers are not comfortable with a building without wood or steel studs, which is why so many SIP buildings get built with 2x splines (expensive, unnecessary, low “R” value, expansion problems, etc.). If they insist on using 2x splines keep looking. Good Luck.

Also, you may need to install type “X” GWB in the garage for fire reasons depending on how your local building department categorizes the building.