Of course, you'll make your offer contingent on a home inspection. You can, in fact, have many different inspections. You can have a separate roof inspection, foundation inspection, pool inspection, etc. Or, you can hire an inspector who has extra training and certifications in roofing, foundations, pools, etc, all of which are important when buying a detached home. Your agent will be able to send you a list of inspectors, AS WELL AS give you the web site to choose your own inspectors who have this training, and verify that the ones on the list actually do. If you see a problem yourself, you can get some estimates from pool companies too. This goes for anything else you see that may need repairs. Better to know before escrow begins! But I'm sure you've heard most of this from your agent!
One extra thing I do is to ask the seller to pay for a CLUE report. It's an easily obtainable $20 report that shows any homeowner insurance claims in the past five years. You never know what will show up undisclosed!
You don't need an addendum for a pool. If you have an inspection contingency, the pool would be part of the property if it's an in-ground pool, that's what it's for.
Please let me know if you have any more questions.
Cory La Scala