One possible issue is that the largest component (27% out of 26%) is `OER`, which can be detached from reality.

Unless owners are completely in the loop in terms of the rental market (which they likely are not, they don't rent), they may not come up with good estimates for what an equivalent rent would be.

Yes, it's in there. But also, IMO, oer is a dreadful metric. It's very laggy, and more opinionated that it ought to be. Rent is rent, but oer seems neither fish nor fowl. It's a wild survey guess that's off by 6 months.

Unfortunately, your source is offline, so I couldn't see where it got its data.

It's very much up for me. In any case here's an archived version:

https://web.archive.org/web/20241009171432/https://www.bls.g...

I meant the original source, the inflation calculator site. Anyway, thanks for the figures. House prices more than doubled but I guess other things must have become cheaper to compensate.

House prices aren't part of the CPI, but housing (ie. rent and owners' equivalent rent) is. The former is an investment but the latter is the thing you actually consume.