Conservatory Building Regs for Small Conservatory on Side Return Kitchen

[microkid]

I am considering building a very small (4ft x 11ft) conservatory to fill in the side return on my single storey kitchen.
Due to the pitch of the existing kitchen roof I am going to have to cut into the roof with the conservatory roof to gain enough headroom. For this reason - and also keep the build simple I am planning on a flat roof over the conservatory with insulation and plasterboard. The rest of the structure will be windows on a dwarf wall and a single door. Access will be via from the kitchen existing double opening external door. There will be no fixed plumbing or power.

I know this is a how long is a piece of string type question - but am i Likely to require building regs for this structure? Will it be seen more as an extension than a conservatory? (I ask this because of the roof). I know it does not require planning as it falls well within permitted development anyway.

Thanks!

[lucylincoln]

I'm not an expert on planning permissions but there are a lot of resources on the internet that might help - if you don't want to get in touch with any local authorities etc. Is your building/anything nearby listed?

This one https://www.planningportal.co.uk/info/200234/home_improvement_projects has interactive guides about extensions and conservatories at the bottom.

And this one seems to say that if the conservatory or single storey extension is within a certain space parameter, you wouldn't need planning permission https://www.homebuilding.co.uk/20-things-you-can-do-no-planning-permission-required/

My main area of knowledge is flat roofing, especially EPDM so let me know if you have any technical questions about that whilst working on your conservatory. I'm not sure if it's of any help, but I found a blog post about installing small residential flat roofs http://waterproofsystems.co.uk/news?journal_blog_post_id=16