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Hi all. I'm exploring designs and ideas for a self-build garden room at the end of my garden under permitted development but having issues understanding the building regs requirement/process for non-combustible material when building within a metre of the boundary. I want to give part of the build over to a chill out/games room and the rest to a separate workshop. My garden is 6.5 metres wide. I want to maximise the build area and build close to the boundary so I'm thinking 4.5mx4m for room and 1.5mx6m for the workshop/shed, creating an L-shaped building. The right and left boundaries are neighbours' gardens, the rear boundary backs onto a park. The garden is 6.5 metres wide and I was hoping to use most of the full width. Under permitted development I think I'm good but believe under building regs I need to make sure the walls on the 3 boundaries are made of non-combustible material. I've found cement boards from Cedral which are A2-s1, d0 rated which I'd use rather than cedar. So, can I just install the boards and (along with the manufacturers specs/receipt) accept that meets building regs? If that's feasible might my neighbours have reason to complain/raise concerns to the council (I have one neighbour that is certainly pedantic enough to notice building within 1m of the boundary and what that requires)? Or am I being a naive newbie and I'd need to follow some complex building regs application/process with plans, fees, inspections for the entire build etc? The cost and oversight from.what I've seen seems a bit prohibitive when trying to keep the costs of the self-build down - especially as the Cedral seems expensive. And if I did go through building control route would I have to meet any other requirements I'd not considered (other than electrics) such as roof joist spacing, rain water runoff....etc..? Hope that's enough background info and the questions aren't to broad/vague. Any thoughts welcomed!

Just making the panel into which the consumer unit will be fitted along with a 60A switch fused unit and a distribution block. Wondered if I can make this panel out of OSB / plywood or if it needs to be specifically flameproof. Reading the regs it looks like it is just the consumer unit that has to be metal but the 'and similar switchgear' catch all is a worry. Essentially it is a box in one of the internal walls that will house the CU accept the in coming cable and take the outgoing cables away. The switch fused unit is for the in-line water heater. Any insights?