Beware of cowboys offering to do the Energy Efficiency Cetificate (EEC) cheaply and stating all or many A ratings, for you.
Anyone carrying out this work should belong to an official provincial association (colegio official) and have a member number. So check with them first.
If a scam, it will be impossible to register, get a proper certificate and you will have wasted your money.

Hi Rita. Yes all houses need this now at the notary for a sale to go through. ( don't think almacens need one, as not classed as a dwelling ) Also one is required if a house is rented long term or holiday let. The law is that the rating must be displayed with the property for sale, but I have to say that down here on the Costa Blanca, no agents seem to be taking any notice of that at all. Talking to agents here, they are treating it as a big joke.( even the notaries  are saying its a worthless bit of paper, never the less it is needed. Just another government bit of paper to make money from. Maybe someone getting a hefty fine will show they mean business.