Insulated timber-framed Garden Room

[Bagheera]

Hi Arkie, after a some more research I believe you are right. The back wall is not on the boundary of the property or near it so b regs don't apply but if someone starts a fire it is a concern-I'll probably clad it in a fibre-cement board like Magply or Cemboard and hope no one lights a fire!
On the right, the boundary it a viewer emailed me saying a visit by his b regs department said that you can have 1m2 of combustible material but no more and my soffits and fascias exceed this, even if the window and door is removed.
However, my understanding is that I don't need anything internal to meet fire class 0.

That's lucky reading the fire!

 

[Bagheera]

I'm just going to draw a line under this post. If you've read all the way through you'll see I went from knowing absolutely nothing to building a decent garden room.

Thank you to everyone who gave advice and shared their knowledge!

If anyone wants to see how it turns out, this is the link to the videos: https://www.youtube.com/playlist?list=PLyBa0yFBQO7Mc6sAZOMd-xujGuorZAs--

 

[efunc]

Thank you for the journey Al! Your's was the inspiration behind my build (which I pulled down and started again following your advice). I hope you use the knowledge you gained to take on greater challenges in the future. Or else just kick back and enjoy what you have! All the best.