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Alice in Scandiland
I would worry about ground floor temps with this kind of structure with the doors taken out. I've posted in the home-owning thread previously about our kitchen conservatory, which is a similar setup, and does not perform well (we pretty much abandon the kitchen table for winter because it's so cold in there).
NickCJ-
Our whole dining room extension thing (brick built, proper roof, semi glazed walls) has been completely off limits for all of December and the last ten days or so. The floor takes all the heat out of the pipes before they can reach the far radiators. 30sq/m of house, lost. I despise it. Thankfully has a door into the house, so we've airlocked it off to keep the rest of the ground floor (barely) warm.
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conservatory companies certainly play fast and loose with regs etc.
by the by - my wife saw this blog and said she wanted a 'pebbles garden' so I bought 3 tonnes of pebbles and shovelled them in like a mug. It was stupidly uncomfortable to walk on so I had to build decks and paths (with deck boards) to make the garden usable. It was however a reasonably cheap and simple way to fill the space where the concrete patio had been and i think if we'd used smaller pebbles - less agony underfoot.
6pt
Sheppz
Structural engineer required re. The founds and buiding regs - I think tricky to use garden studio type stuff abutting trad concrete strip - mini piles and a ring beam might be an option. Re. Timber frame - look at nimtim - they did a similar extension in wood but you’ll need to clad in brick to match house for pd - if not you need planning perm. The other option is a modern conservatory - which sounds yuck - but look at the blog Alice in Scandiland - made a decent enough space. May get too hot tho. Loos wise - minimum cubicle size needs a clear 450mm turning circle - they can be skinny but you need length to make it work - 800 x 2000 should work.