@FluffyDiplodocus this sounds a bit like what we want to do, but have a double glazed sliding lockable door that separates the kitchen from the conservatory.
We have one solid all-brick wall to the left of the internal doors, with an actual proper extension room on the other side of it that we use as an office to wfh. That extension was originally used as a playroom by previous owners and was joined to the lounge / dining area.
The other walls in the conservatory are brick from the ground, a few feet high then all double glazed windows above that. It has a upvc back door to the garden and then a very rubbish plastic roof. There a central heating radiator in there too, and for the life is us we can't understand why the previous owners didn't just have a proper extension like the room on the other side of the wall that we use as an office. I guess at the time conservatories were very in. It probably took some time living with it to realise the thin plastic roof made it too hot or cold to use most of the year! We've got the original design plans they left and it was always going to be the cheapy plastic roof. If only they'd had a proper roof instead!
The kitchen the conservatory's joined on to
is a very small galley kitchen and we'd love to remove the sliding doors, and open the kitchen out into the conservatory, have a completely new kitchen that extends into the current conservatory space, and have a space for a sofa, TV etc as well.
Am I right in thinking this would need building regs and be classed as an extension, even though the conservatory space is already there? We'd love to put a proper roof on and patio / bifold doors too, and put the space to use as an extended kitchen in the future