I was living in Texas when I started looking for my school bus. Luckily, Texas happens to be one of the best places to find a school bus because of the climate. In South Texas, school buses are not exposed to snow, salt on the roads, or sea air, all the things that cause rust. In addition, they usually come standard with window tint to help with overheating. Many school districts auction off their retired inventory, and you can purchase them directly through from the district. I researched that option, but I found a church that bought school buses from auctions, then they would make minor improvements on the engine and resell them. The bus dealer I found on Craigslist had 15-20 buses, and I got to test drive and inspect a few before I found the one I wanted.
I worked a full-time job throughout my entire build, so I only had about two days a week to work on the bus. I also had difficultly finding a place to work on the bus. Luckily, my family had some property about two hours away from my work and residence. So with all that said, I was able to complete my build in about 19 months. If I just calculated actual working days, it took me about 60 days.
Not at all—the total was $25,000 (USD). The bus was $5,000, and the cost of all the materials for conversion was $20,000. I liked the process; I'd sell mine and build another one!
Currently, my Skoolie is my primary residence, and I have spent the last six months traveling around the West, exploring and doing all the outdoor adventures I love. I've met up with old friends, made new ones, hosted dinners and adventures all over the Southwest, and planning on doing the same through the Pacific Northwest and West. I love my Skoolie—but I would part with it for the right price, then I'd build another one because I loved the building process.
I could tend to be a bit of a perfectionist, so throughout the build, if I didn't like something, I just tore it out and redid it. I did this with my subfloors, cabinet locks (I had three variations before I got it to work), and dining table. I am pleased with the finished product in actual practice, although, in future builds, I might combine the shower bathroom into one dual-purpose room instead of two small areas.
When I started this project, I didn't have any experience with building or remodeling anything, and I didn't even own any tools! So I went out and bought everything new, which was not necessary. There are so many places where you can buy arguably better quality tools for a better price than the most inexpensive brand new products. Since I've purchased my tools, I have found better quality, slightly used tools at garage sales, pawnshops, consignment stores, and online. The same goes for materials; you don't always need brand new things. If you do a little extra digging, some places have leftovers from huge home builds, which is excellent because Skoolies don't need many materials—you need to be a little more flexible.
This is a tricky question to answer, but maybe if you mean sustainable in reference to the environment. Living in a Skoolie makes me more aware of my impact. I generate all my energy through my solar panels. I have to be mindful of what is going into my gray water tanks, so I only use environmentally friendly/biodegradable products. Trash and recycling pile up quickly if I were to live as I did before bus life. Some have even converted their bus engines to run on plant oils and biodiesel to lower their impact even more.