The energy and emissions report is the one you need upfront. Then, if the potential goes on to buy, you will need the full diagnostics plus a fosse report if your fosse is older than 2 years old.
The point about not paying for the full report is because some of the certificates, like termites, have short time limits. If you can dig out the reports from when you yourself bought, you could ask the same firm to do these things.
It was what I did and it was useful and time-saving. The man just did the electrics and then, when the sale proceeded, he reported on the rest. PLUS he had a lot of the info from the time before so it was a save-save all round.
Also, time- and energy-saving is using the same notaire for buyers and sellers. Saves a lot of toing and froing between notaires and a couple of visits plus some phone calls and emails sort everything. I persuaded our buyers to do this and they also saw the advantage of using the same chap once I explained how it worked to them (they were French so buying and selling houses seemed to have been a totally alien process to them!
Apprendre une langue, c'est faire un voyage différent chaque jour.
from Fle pour les curieux