The building has no house panel, so installation is going to be expensive any way you look at it.My question here is are the older battery powered detectors "grandfathered", or will I need to upgrade the detectors immediately.

With a few limited add-ins/subtractions for additional features like garage/deck...though, added nothing for my solar panels (whatever!). 

The 3/8 isnt the treads its the toe kick panels. 

If you are adding equipment or remodeling the kitchen, make sure there is space in the elec panel. 

The inside of the wood paneling in the built in cabinets down there were even rotten.

Another 300 sq ft room has wood paneling, but no drywall behind it....is it worth it to add sheetrock and rent?  

Once we started construction, we ran into several major problems including a steam pipe running through a kitchen wall that we were planning to open up, a huge leak inside a couple of walls that required the replacing of a whole exterior wall, damaged subfloors, major termite damage that resulted in a replacement of the sill plate in the master bedroom, needing to upgrade full electrical service (and split it into two separate panels) and a corroded water line that required emergency replacement all the way to the street in the middle of winter during record setting cold temps and a snow storm.

By the way, Kevin will be speaking there and appearing on a panel!  

Breece Veneer & Panel Co., 232 F .2d 319.

without a furnace could be solar, could be wood stove, fireplace, or could be vacant property.