Permitting for adding more rooms without changing sq ft

[Jaskanwal Preet Singh Chhabra]

Hello, I am an investor in Austin, Tx. I am looking at a 4 bed 2.5 bath property in Pfugerville, TX that I am planning to rent out as a co-living space (rent by the room on Padsplit). I will be converting it into a 8 bed 3 bath property. However, in adding the bedrooms, no new sq.ft will be added. I will split a giant master room into two smaller rooms and will convert the living room to get the additional three rooms. I understand I will need to pull a permit to add shower area in the third bathroom but would a permit be required for the three additional rooms, especially given I will not be adding any new sq ft to the property? I am thinking more from the insurance and future liability stand point. If so, what will be the typical time and cost to pull the permit for such a project. Thank you!