Have been looking at moving and have seen a house we both quite like but it isn't on the grid and has LPG. Hoping to get some info from the TZ-UK collective :)

The house is new build (although has been finished over a year with no-one living there), and I presume has a tank underground as I saw no sign above ground but a green plastic manhole cover in the front garden.

How much more expensive is it?
Does the equipment running off it need to be specialised like boiler, cooker etc?
Anything to look out for/be wary of?

Basically any information you can give I'd appreciate as we have no idea whatsoever.

Paul.