Considering moving to PR in a few years. Building Costs?

Hello
I am a resident of Washington State with a husband that has 25+ years in the Aeronautics/Aviation business, and a son skilled in Manufacturing Technology. Both are what I would consider "skilled" labor.

We as a family are considering moving to PR in 2-3 years as a precursor to full retirement for my husband and I later on.

My biggest concern is trying to build a home or buy one for $220,000 or less.  It does not need to be big by any means, just comfortable.

Does anyone know of the average cost per square foot to build anywhere on the West or Southern side of the Island?

Thanks so much for any advice given and I look forward to using the site often for my research.