We, as well as friends and family have both built and remodeled in RSF, as well as other other locations in San Diego, but that was quite a few years ago.
At that time, because of the deals we were able to make with people we knew, it was very-cost effective, but, at today’s costs, you’ll definitely want to do a lot of research, and try to talk to others who have built within the last 5 years or so to get a feel for the current market.
Also, you might want to look at custom and
semi-custom communities like Santaluz in the 92127 zipcode. In addition, they are currently building some very nice estate homes in Del Sur in the same zip code, near Black Mountain, which people also seem to really like.
Here’s a link (and, no, I’m not affiliated with SP)