Woody - you asked "
when is a garden room a caravan or even transportable?"
I said that a transportable/portable building could be installed for use as a garden room and posted a bunch of photos in case your question indicated that you thought that something that qualified under the Caravan Act had to be something which looked like, or was, what is commonly understood to be a "caravan".
You then asked "
And you are saying that every one of those buildings in those pictures you have posted do not, and did not require any planning permission or permitted development rights, but have been installed for perpetuity under the "Caravan Act"?
Now we have two questions to consider.
1) Do the buildings themselves meet the definition in the Caravan Act of a portable building?
and
2) Does the way they are used meet the requirements in the Caravan Act which would allow them to be installed and used without needing PP or PD rights?
Now, I have no idea about (2), which is why I was careful to answer how I did.
Use is important. If you want one to use as a gym, or a recording studio, or a hobby room, or a workshop, or a pool house, or for overnight guest accommodation when family or friends visit, or a myriad of uses incidental to the use of your dwelling, then yes, that qualifies. If you want to rent it out as an independent dwelling to people who are nothing to do with your household then that is definitely not OK.
But as for (1) then yes, absolutely, all of them meet the definition for the building in the Caravan Act.
I can't tell about (2) just from the photographs,
and neither can you.
So no -
Just looking at them it's clear they would either need planning pension or comply with PD criteria.
You cant tell that just by looking at them.
The reference of them being caravans under the Act, is irrelevant ( and I doubt very must that they are) if they need to comply with planning laws when plonked into those situations in the images.
No it is not irrelevant, and yes, subject to how they are used, they are indeed "caravans under the Act" whether you think they are or not.
For some reason you have ignored what I said about how the
use of the buildings may require PP, but the nature of them doesnt necessarily mean that. Only you know what that reason was.
As I see it you have two options.
1. Find out what the Caravan Act actually says
2. Continue to write stuff without knowing that and therefore risk writing things which are wrong.
Its up to you.