Steel SIP panels in New Hampshire.

The panel package costs more than a lumber package. The finished wall usually costs less, because the panel replaces framing, insulation, sheathing and vapour barrier and cuts framing labour by roughly half, then the mechanical system shrinks by about 50%. We will price it both ways so you can see the whole picture rather than one line of it.

Many do. Every panel is numbered to match the drawing, bundles arrive in wall-line order with track and screws included, and the 36-page illustrated assembly manual on our resources page is written to be read before the truck arrives.

It is the best case for it. Cutting the heating and cooling load by up to 75% means a smaller array, a smaller battery bank and a generator you rarely need to start.

No. We have supplied everything from a garden shed to a six-storey building, and the drawings, labelling and delivery work the same way at either end.

A documented R-51 to R-61 envelope and a heating bill a quarter of the neighbours’ is an unusually concrete thing to put in a listing, and buyers in this market have learned to ask.

Yes. Matching an existing structure is a drawing problem, and the addition ends up better insulated than what it attaches to, which is usually the point.

No. Your own framer, in almost every case. Training runs under two hours for a crew that has framed before, and the only power tool required is a screw gun.