Slightly off topic I know, but if thinking about Hua Hin to live and build your own, is that the price of land here is very expensive, so unless you have bought a few years back, it could be a deal breaker.
It's also still an expanding town and many new build developments I looked at literally 10 years ago are now in very built up areas. One in particular I recall was Hua Hin laguna on Soi102, which seemed so far out of town and the road was only sealed part of the way and in any direction you looked, when over the railway line, all you saw was empty land, it was all very green and wild.
I regularly drive down 102 now when leaving Bluport (shopping mall) the back way as a short cut. It's so developed now, that it took me a while to even spot the entrance to Hua Hin Laguna, which seems to be shared with a couple of other places, including two condo blocks, although they are probably all part of a now much larger development and work still seems to be going on. But the further you go down 102, the greener it gets and towards it's end it's still what someone called, 'a goat track'.
But it's a buyers marker here and even where I live there are various houses for sale, not advertised as such by signs on the gate but on-line, including the one directly opposite me, which continues to be lived in and which I wasn't aware was for sale. By coincidence, yesterday, I bumped into the chap I used to find my place for me, who has lived and worked in HH for about 18 years and is one of the good guy's and first showed me around places here over 10 years ago. He said he has never known business so quiet. Basically, the stronger baht and weaker western currencies has simply killed the market, which was already very much a buyers market. And there are many places for sale. I bought my place at cost price i.e what it cost as a new build and at least with pre-owned houses, generally any faults have long been fixed. However, as my place had only been very lightly used by the then new owner, who moved into a place to my left with her new boyfriend and was then rented out for a about 6-months (at 25k pm, I found the receipts), a few issues did came to light. One was a big problem with built in drainage from an air-con, which was in the wall cavity and was leaking and we diverted the pipe otherwise it was just bashing in the wall until the leak was traced and the 2nd has only just emerged - one hairline crack in an interior wall about 2 foot long from the ceiling. My builder neighbour has told me it's purely cosmetic and he had a few in the first couple of years after he moved in.