Advice on updating old drain plumbing to current code.
I'm in the process of renovating my small 1946 bungalow.
Its a fairly extensive remodel (all the drywall is off) and since I have the opportunity to access most of the plumbing, I'd like to take the opportunity to bring it up to current code if possible.
I'd appreciate any advice on what should be done to add venting, cleanouts (or anything else) to bring this up to current standards.
I've added a diagram to show the current layout (in black) along with some of my thoughts on updates (in red).
Developed lengths of all horizontal branches are less than 1.5m(4.9ft)
It's originally a single level house that has had a basement suite installed as part of a previous renovation (prior to us buying the house).
The bathrooms are located one on top of the other and use a basic stack vent waste system.
The basement drain plumbing is buried beneath the concrete slab so I'm not sure what's going on there but a separate vent stack was added presumably when the downstairs bathroom was put in.
I'd appreciate any suggestions on additional venting for the lavatories, adding cleanout locations and the use of TY fittings on the main stack.
thanks in advance for your help