I did 2 gut renovations in 2020 and 2021 and both cost around 11k. But here’s the key- purchase all the materials yourself. In essence, be your own contractor. I used Ardente for my tub and toilet, build.com for the fixtures, kitchen countertop in Pawtucket for the vanity countertop and sink. glass door at Bristol county glass and I bought my vanity and mirror at Lowe’s. Once that was done I went looking around for labor. Plumbing labor was $1000 per bathroom, tile labor was around$3000 per bathroom, carpentry was around $1000 total. Plumbing fixtures cost about$1000. Lighting another $500 per bathroom including vent and vanity lighting. If you do your legwork you can get the price down substantially.