It probably depends quite a bit on how easy your house is to integrate new plumbing systems into. I'd imagine that would be the most significant cost for adding a bathroom besides the fixtures. I would ask around to general contractors and they might be able to refer to you some plumbers that would do a good job. From there, you should be able to get some accurate bids. http://www.dawaterwerks.com... more
If it's an investment property from which you gain income, assessments are deductible.
If it is a primary residence and the roof/assessment is specific to your unit then the amount for the roof is applicable to apply to lower your capital gains when you sell your unit (Keep your receipts/payment stubs/invoices).
If the assessment is for a roof that is shared by your entire condo association that is much more complex and you will have to talk to your accountant to gauge what amount is applicable against your capital gains.... more