Personally I would not buy a house that was designed by a Filipino in a sub division (anywhere)..Not only are they usually poorly designed,they have incredibly bad plumbing and are electrical death traps!! They are also poorly insulated and cost a fortune to keep cool..
Far better to buy a titled lot within a sub division and build your own IMO.. Lots of planning and as much local construction knowledge as possible required.
Construction material`s are going up up up on sometimes a weekly basis and in certain areas...So is land...
Also never forget the fact that we as foreigners cannot own land here in the P.I. and at the end of the build it will NOT be yours!!
Cheers,
Fred.