Really? I don't think so , for several reasons reasons

Not the BBC, nor the Telegraph, Sun, Mirror, or Guardian have picked up on it. Not even the Daily Mail, which loves this Goverment so much. Which paper?

It would be something perfectly designed to seriously annoy Mr&Mrs Middle Class, the voters who went over to Labour in 1997, and if the Goverment loses many more, it will lose vast numbers of seats.

And IIRC, they're already taxed. Vat is levied on all building projects, except repairs to listed buildings or the construction of new buildings.