[quote=zach347]You are going to spend three times what you think. You will have to rip absolutely everything out including most if not all of the drywall (especially since this will make it easier to re-route all of your wiring).
Cutting the slab to run new plumbing is going to be a really fun adventure especially if your plan takes you through an existing footing.
Moving walls? Better make sure thats even possible first, are they load bearing? If so you’ll have to build temporaries and pour new footings.
Dealing with the city with all of this stuff, just shoot yourself now.
Adding on an entire additional master suite probably wouldn’t cost too much more than all of this, plus, your existing home will be operational.[/quote]

zach347, I agree. But if ryphoenix expands the footprint of the house, after the City signs off on the “remodel,” they will report this info to the Co. Assessor, who will then reassess the property based upon the *new* total square footage. This is something (s)he should take into consideration.

ryphoenix, I would recommend you use the same drains for the toilet and shower and move a wall or two inside a bedroom to expand the size of the existing bathroom instead of move it. Consider buying a one-story property with four small bedrooms and two baths (a common L-shape design circa 1961 in 92111). This would work best for what you’re trying to do. Then, if you should want to sell it in the future, it will still be a 3 br/2 ba house 🙂

I guess this might be a more productive discussion if you had already purchased a particular property you are thinking of making this alteration to.