Sole trader - working out actual expenses

[CAGW]

Hello all,

I recently started a business from home. I am registered as a sole trader. I work less than 25 hours a week, so I understand I will need to use actual expenses, rather than simplified expenses.

I am currently working out the area of my home I can claim expenses on. My question is do I count the kitchen and bathroom in these calculations? I read somewhere that for these purposes they don’t count towards the total area. If anyone could confirm either way I’d be very grateful.

Thanks