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You don’t say where in Guanacaste you want to build, nor did you indicate how big a project you are proposing. FWIW, we are having our retirement cottage built near Lake Arenal, and our experience has been that the architect is NOT the first person to talk to. We have the good fortune to be long-time friends with our builder (about ten years). He showed us some houses that he has built, and we decided that we like one, so he contacted the engineer/architect, who provided the formal plans, and is responsible overall for the construction (btw, the engineer/architect has cost –imho – much too much for the little he has done to date), but the actual building costs are being determined by our requests, and by the builder, rather than the architect. I know that our total cost will be higher than we used to think it should be (for Costa Rica), but still much better than South Florida prices.

I would imagine you can find your builder by looking at construction sites similar to what you want in your general area.