LANDLORD CONVERTING SITTING ROOM TO BEDROOM

So my landlord is converting the sitting room into a bedroom. We have only been made aware of this today that he plans to start work Monday. I am unable to contact the RTB now that it’s the weekend. There will be less living space & increased utilities usage as a result. There’s also inadequate kitchen storage space for another occupant as is in terms of fridge and food presses. He plans to keep the rent the same but the rental arrangement would be decreasing in value from when we entered the tenancy. Can anyone please share accurate insight into the legislation on this if there is any.