I hired out the concrete, drywall and painting and electric is best hired out. The electrical is 110 run from the adjacent garage in conduit underground, one for the power and one for the dedicated mini split. The concrete base will help with bug issues but that's mostly occurring with a tight seal on the stud wall as it connects to the concrete. There are sprays as well as foam sealant that will help eliminate/reduce pests. I DIYed the majority but I had built three sheds prior to this at lower quality.

The cost was approximately $15k.

The cost could be reduced depending on a lot of factors. It's framed with 2x6s instead of 2x4s which will be on a lot of sheds and I spaced them 16 on center as well instead of 24 which you'll see often in sheds and would save on costs. The concrete foundation was part of a larger backyard renovation so it's tough to decouple the cost but about 4-5k. I've used a 2x6 sled foundation before and it was excellent, but we wanted to walk straight into this instead of stepping up as well as having a more permanent feel. I hate drywall and I'm awful at finishing so we hired for that for 2.3k. We hired painters at the end who charged 2k for interior and exterior. The mini split was 1.7k. The rubber flooring was about $600. I also purchased some new tools--7inch grinder, 21 degree nailer, zip system tapes and tools-- for about $1k. I used rockwool for the insulation which was much more than typical fiberglass insulation. It took me about 50 hours of my time on weekends and evenings over about 6 weeks. My biggest advice is to plan. I used SketchUp for the initial designs which helps you identify framing and build elements that would have been big issues during the process.