I recommend reviewing your local laws to understand the requirements involved.

Quote from @Elinore Aguilar: The best way is to have the best firm with a reasonable rate and trust reviews.

Get a quote from them or get the fire marshall and the electrician at to the home together and walkthrough what they want to do and have fire marshall review to see if that appears acceptable to them.

There is a kind of "board" which is assorted family members who meet bi-annually to review, vote, decide on any items they need to. 

In our area, the housing authority does annual inspections to (mostly making sure the landlord is keeping up the units) review the tenant and the landlord. 

Your account with hundreds/thousands of reviews is the biggest asset!  

As others have stated, you'll always encounter issues, problems, and complaints (negative reviews) from all sides tenants, landlords, and vendors.The bottom line?

With Google, Yelp, Facebook reviews as well as what is on their site and what type of content they are posting on their social media pages....

His goal is to diversity his money as he's been very successful in another business.

As a licensed contractor and real estate agent, I can review your estimates, ask the questions you might not know to ask, and help you make an informed decision that balances cost with quality.