Is there a rough multiplier I can use to update an old building estimate?

Question

I've got a building estimate from 1995 which says a building, which was designed back then, would cost approx. £135k.

What I'm trying to do is guestimate the current cost of this building based on 13 years of inflation, etc.

I did remember someone saying that prices double every 10 years but is this realistic? Does approx. £310k sound reasonable?

Answer 1

not necessarily as the cost of materials fluctuate and the building itself might not meet the current building regs for health, safety and the environment

Answer 2

Can't base it on anything, but I sort of *feel* that's about right.