Please let me know if you would like a hand setting it up.

Flooring- for tile or laminate is also cheaper.For doors we bought at Home depot pre drilled for the handset but mounted the hinges ourself - $35 per vs $100+ for pre hung.Feel free to give me a call if you have any questions or I can help in any way.Thanks,BobPS Below are cabinets and granite we bought from BMO.  

After purchasing the handsets, I can change the cylinders in about a minute each.  

I would provide a minimum of one active jack (probably office or kitchen area) and the rest of the rooms can have a cordless extension handset, which don't require a separate jack.

If you're buying new doors, you can get them with no holes drilled for handsets.

I have work number and personal number both ring to handset.

We have done houses and a bare door (Nice 6 panel) drilled for the handset is @ $35 at home Depot, add $15 for a handle and labor to paint it and router the recess for the hinges.Paint the house - we pay less then $1 per sq foot for exterior

Consult a your CPA before hand, set up your entity, and you can likely write off a lot of these "discovery" expenses.  

What kind of handset do you have on the bathroom door?

Of course it makes changing building entrance key more difficult.We've also learned to NOT install keyed handsets for SFR entry doors.