build a house in the Philippines

I am not quite sure for the 75/75 sqm Floor area, i
need a big space on the Ground Floor.
Let just come out with the design scheme before going
further to the estimated price i think, i'm quite
particular with the design actually.
To discuss it further what sort of requirement do you
need, currently i got the lot plan plotted on CAD. If
you want to discuss it personally i'll be home next
yr. March i'll give you my details back home as soon
as we get this things sort out.
Before we go further are this preliminary architectural design or
sketches are part of your free services including
estimation? just want to clarify.

The exact location of my lot is at Baypoint Residential Estates in Centenial Road, Kawit, Cavite. According to some there are many contractors who are the one financing the said construction of houses are you one of them? it is a two lots with a total of 280sqm what i want to build is a 4BR 4TB maids room & music room/family room and a veranda or trellis with this specifications how much is the budget or the total cost build a house in the Philippines? how much? concrete.