How to Measure Buildings & Objects

Please forgive my newb questions.

We need to add to our mobile app the ability to measure building dimensions, measure windows & doors, and then have an option to accept the measurements into the database accordingly.

So not I am trying to find advice on how to do this using Microsoft services, &/or whatever else we will require.  Does anyone know where I should be looking, &/or what I should be looking into, so I can shortlist where to focus?