Something you may not have thought about or budgetted: you say you're decent with Energystar stuff. Nice. What do bought versions of the relevant standards cost you? How much more for all the standards those standards refer to?
It's one thing to scrap bits and pieces of the internet for your own use, but if you present yourself as a lab, you will probably have to buy a stack of standards. And that s**t is expensive.
Hi
Well, if we are adding up overhead costs:
Equipment calibration at least once a year with full traceability and certs from a "real" lab.
ISO certification from a "real" auditor that people recognize (Bob's Finest Audit Service does not count ....)
Standards and updates to standards ..... and referenced standards ... and sub-standards and .... (= the library)
Profesional acreditaron / memberships
Financial audits and all the "tax man" stuff. (Licenses, permits, paper ... paper .... paper)
Building rent and utilities.
Insurance (basic like building and cars, liability to cover the work you do).
.... and on and on.
I'd say that at least what is on the list above is going to be on the questionnaire we would send out. You could easily say that much of that is none of our business. Surprisingly enough, that is a rare response. You may not need to prove all of the above, but you at least need to answer the question "yup, we have that". The one that many people are surprised by is the liability insurance. We want to be able to sue you for our damages if you screw up. If our customer bills us $4.6 M due to a mistake you made, we want to pass that on to you. Before you waffle about customers never doing that sort of charge back, it happens all the time. That doesn't mean we pay it, but there is a discussion.
Lots of fun.
Bob