Prices fluctuate a lot, embodied energy and production energy can fluctuate for the same thing too, but trend down until they got the ceiling or whole branch of technology is phased out.

You could take some representative branches of housing to build what is called an energy basket, using similar method used to calculate PPP.

Such rough methods would include communication, transportation, housing, clothing, food, self-expression and a few more mostly timeless needs that haven't changed for many centuries.

The problem is of accurate representative sampling of each category. That gets easier the closer we are to modernity with big data gathering.

The methodology would survive start from before bronze age even, I think.

And economists measure inflation by the prices of goods...