If you would like a cell number for any of the contacts, just pm me.  

So the question you are asking is impossible for anyone in this forum to answer unless we knew exactly what his overhead was (truck costs, tool expenses, auto, worker comp, health insurances, rents, advertising, cell phone, marketing collateral, vacation time, credit card fees, accounting, software, office supplies, computer expenses, etc...) to name a few.

In the condo building were I live there door system works via phone, at the front gate when someone buzzes it just calls the respective cell phone.  

Potential UpsideAnother cell phone provider may rent the cell tower, at approx 2x the current rents.  

I then used closed cell spray foam to ensure that it was encapsulated from the interior.I am not saying this was the best solution, but what I did.  

I can access all info about the project either from my cell, tablet, laptop.

Here is what I would like to see:a set of exterior pictures incl all 4 sides of the house, the front and back yard and the garagea picture of every roomseveral pics of kitchen and bathroomsfurnace, AC, water heater, electric breaker panel and electric service outsidebasement walls, cracks if any, water stains, any puddlesa close up shot of: a sample window (the frame, not the glass), flooring, siding, roof shingles -  if possibleanything else that needs attention or is broken (crumbeling chimney, a huge fallen tree, water stains on the ceiling etc)Better to take the pictures with an actual camera with a real flash, cell phone shots are usually not good enough, because they turn out too dark and don't show details.

Also, no idea why the spacing on this post shows up so ugly but I typed the OP on a cell phone...

The name of a skip tracer who supplies cell phone numbers

I am debating the idea of operating with just my cell phone as my primary contact number, versus having a cell phone and an additional VoIP company.