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No planning considerations then?
No planning needed with those dimensions as long as it's 2 meters away from boundaries (and a few other restrictions).
Agreed on prices....In my case I needed the head space (pitched roof) so I was a little bit more limited.....I had about 6 or 7 quotes from different providers for similar builds. A couple came cheaper but they looked crap and you could tell the quality wasn't there but most came higher with no added benefits...these guys came recommended, quality of materials and experience was bang on. They came across really patient, nice and helpful during site visit. And the fact that they do DIY kit allowed me to save a considerable amount...I looked at building it myself from scratch but decided against it at the end....
There is no straightforward answer to that question as they are all bespoke....But to give you an idea ours is 7x4.25 meters with a pitched roof of 4 meters high, (semi)soundproofing, partition for toilet, 3.5 meters bifolding doors and 2 extra windows and the DIY kit came at just above 20k....Does not include the slab/foundation and electricity though...If you go for a more common 2.5m high flat roof it brings the cost down significantly.