Master Bedroom are larger, so you have more materials, but same principles apply.Kitchens: Determine a Cost for Cabinets, Appliances, Flooring, Lighting, Plumbing Fixtures, electrical plugs, etc.  

For example, depending on condition of kitchen cabinets etc i just stain or paint and put new fixtures.

Take notes of the big ticket items, such as appliances, kitchen cabinets, HVAC, flooring, etc.

It will have engineered wood flooring, tile in baths, granite or quartz on countertops, wood cabinets, stainless steel appliances. 

A dripping P-trap might be a $10 part but the rotted cabinet plus install can end up being several hundred dollars. 

Outdated HVAC.Sub flooring under toilet and kitchen sink is rotted from leaking.All windows (6) are original and need to be replaced.Driveway is crumbled.Kitchen cabinets and counter tops are in really bad shape. 

They make plastic hinges and stuff for kitchen cabinets. 

@Joseph Konney: The upper unit the guy I bought it from had started the work already, so there was little to do  besides paint and finish bathroom floor paint and light fixtures and same with Kitchen and 1 cabinet and I repainted because the color he had was awful.

When we were finally able to start renovations, COVID hit and our cabinets got delayed over a month, so we are still renovating (8 months later).It's been a hassle, but we learned so much and has been a great way to live without a housing payment so that we can save for the next investment.  

@Cj McDougal The tenant occupied an adjoining unit that the plumber needed to enter to access the plumbing to stop a bad leak that was destroying my new kitchen cabinets in the next door unit.