having a go

Thanks. So, I've written to local building control let's see what they say. If they come back negative I see I have two options go for a steel frame or build smaller.

Hi, I'm looking for some advice in relation to building regulation compliance for outbuildings. I'm looking to build a garden office of over 15m2 but less than 30m2 it will be sited within 1m of our boundary on 3 sides. I understand that while this does not need to be compliant with full building regulations the building must be non-combustible due to proximity to the boundaries. I'd like to understand what would need to be done to make the building fire resistant. My plan is to construct the building using a timber frame or SIPs. Are these completely non compliant since they are combustible materials or is it more about the external cladding, which in this case would be sheet steel to the 3 sides facing the boundary and composite / Canadian red cedar to the front. I've seen similar issues posted on this forum but nothing conclusive on what level of fire proofing or is required in this situation. Many thanks in advance