What is the anticipated extra cost of implementing the stretch energy code for updating a bathroom?
If we consider a typical bathroom upgrade which will replace plumbing fixtures, remove and replace the shower / bathtub, install new cabinets and countertops, and installing a tile floor, there will be no extra cost for compliance with the stretch energy code. These changes will not trigger any energy related changes to the rest of the home like a new heating system or attic insulation. If you expose existing ceiling, wall or floor cavities during the renovation both the baseline building code and the stretch energy code require that any empty cavities be filled with insulation that meets or exceeds an R value of 3.5 / inch. There is no difference in cost for this renovation under the stretch energy code or the baseline building code.
