you should seal the house. it is not expensive.walk the perimeter. fill any holes you see along the foundation with mortar, spray foam, steel wool, etc.then go in the basement and do the same along your rim joists and any other holes you findyou have to be thorough. mice only need a dime sized hole to fit thru

Considering this is most certainly built on a slab, adding an additional kitchen may well require busting up the foundation in order to run the second set of plumbing.

It take time to build a solid foundation.

I am still trying to build a foundation for financial literacy and real estate investing.

Build a solid foundation, THEN move forward 

Plan to order a structural engineering study to determine if the house has sufficient foundation to add a couple rooms above the back. 

These cracks appear only on one corner/side of the house,noticed a horizontal detach of the last block across the house sideobviously here is a a foundation settlement, wanted to know what should the fix cost look like

Unless there is a true foundation, it won’t work.

With the latter, you're looking at BIG money in foundation repair, wiring and plumbing upgrades, etc.

. - Carriage House needs a lot of work to convert buuut has a modern foundation meant for a two story house and roughed in plumbing.- Renos will take 3-4 months unless permits hold us up.- Property is in Kitchener, Ontario, Canada