Up to 30% is what a Owner Builder is trying to save, I advise people that when it’s all over and done with the majority of the savings is typically reinvested into the project during the way. You will end up with a superior product depending on how much you’re willing to invest in time and educating yourself.
I'm in the middle of an OB right now. I'd say Aqua-Holics is right on with savings. It's hard to know exactly as trying to get apples to apples comparison is difficult at best. I've thought about asking a pool builder to quote my pool but I'm sure they wouldn't spend the time.
My pool (not including fence, decking, and gas fire pots) will be about $60K (take a look at my build thread in my signature to see what I'm doing). If I'd eliminate the water scuppers, columns, and feature wall, I could save about another $6-7K. I didn't put too much of the savings back in the pool (beyond what I was originally planning). Although I guess that probably isn't entirely true. If I went with a pool builder I expect we would have had a smaller pool and ledge. I did spend about $5K more on plumbing and rebar, and many times I didn't go with the low bidder. It will be a well-built pool, better than any a pool builder has done in our neighborhood.
Can going the Owner Builder route save enough money to risk the potential issues and being my own warranty provider?
You can save quite a bit, and this forum can really help along the way to prevent issues. You have to ask yourself how much you want to be into the details and how much time you have. If you aren't overly concerned with design details and have some time to review bids and coordinate with contractors it can be done without consuming your life.
One of the areas I found more time consuming is to vet contractors. It starts with getting names from folks, looking them up online for reviews and BBB complaints, checking they are licensed and bonded (the
AZ ROC site is great for that). I see you're in Phoenix, I have built a list of over 120 contractors for all the various scopes that I'd be happy to share if you PM me. I have spent a lot of time on mine, but I'm retired, love construction projects, and I am cursed with being an engineer.
Every contractor offers a warranty, most I've dealt with say 2 years, a few I selected said they offer 3 years. If you are curious about variability in pricing, see attached. The attachment shows every scope and contractor in a pivot so you can see the range of quotes from low to high.
I'm no expert, but I'd be happy to answer any questions I can based on my limited experience.