First, consider not only your needs. It's easy to say you want this and not want that, but don't forget those that are outside your control; that is, the environment or the natural landscape of the place. Think if the house would still be marketable to future buyers in case there' a need to move into another place or location. This is seldom taken into consideration by people who buy houses as they please, but it's always nice to leave room for whatever might happen in the future.
Second, tailor fit the Philippines house and lot to the lifestyles of you and your family. Consider their tastes, the stage they are in, whether or not you're harboring a young family, or your parents, or just your partner with you. Consider future spaces for your kids once they're grown or maybe for your elderly parents, as well as how many guest rooms you plan to maintain. Consider whether you want a formal dining room or an entertainment room that's free for all, somewhere that your relatives can relax in for those family get togethers. Lastly, think about where you would be spending most of your quality time in the house. Is it the living room? The kitchen? These places should be very comfortable.
Third, consider your privacy. This seems to be redundant with the act of looking for a place of your own, but it is still important to emphasize. Most people want to have privacy in the masters bedroom and living spaces, but also think if you want the privacy of your own office inside the house or your own library. Do you want your own personal work space to do messy things in or a center point to do meditation or practice your craft? House designs can depend on your taste for privacy. For instance, those that have an L or U shape offer more chances of privacy than those with in an urban or suburban lot. Also, privacy need not confine itself to the inside of your house. Think about the amount of attention you'd want from the neighbors when you're at your backyard, doing gardening or swimming in your pool.
Also consider where you will put your existing furniture's (aside from the ones you plant to acquire for the house). Is there really a space for your favorite triple large couch and the grand piano your daughter has insisted you bring along? Also consider if there's enough walking and breathing space once you're done decorating the whole place up.
Last and definitely not the least, the geographical and natural settings in which you pick your dream Philippines house and lot can have a large effect on your lifestyle. Consider if you want a view, a large lawn for your garden, or a space to put recreational things for your kids, including a pool if you want to.
There are definitely a lot of factors to consider in choosing a place. Be sure to know which of these are extremely non-negotiable so that you and your family will be happy with the purchase. Remember that a house should not be merely a house but a home for everyone in it.