Buying pre-selling means paying for something that does not exist yet. The showroom has a scale model, the brochure has a drawing of a landscaped street, and the site itself is often bare ground behind a fence. One thing is already real and already mapped: the land.

The land is the part you can check today

Everything else about a pre-selling project is a promise. The ground is not. Elevation, slope, distance to the nearest waterway, mapped flood exposure, mapped landslide susceptibility, distance to the nearest mapped active fault: all of it exists now and can be read now, before you pay a single peso.

That is the whole argument for screening early. A reservation fee is usually the cheapest moment to walk away. Once you are three years into amortization on a unit that has not been turned over, walking away costs a lot more.

Get the coordinates, not the marketing name. A project name is not an address. Ask the agent for the exact location of the block and lot, or pin the site on a map and use those coordinates. Screening "Sunrise Grove Phase 2" gets you nothing; screening the actual pin gets you the layers.

What the developer's brochure will not tell you

Marketing material talks about amenities and turnover dates. It does not usually talk about the four things a screening reads:

• Flood. What the mapped flood hazard says at the site. Read how to read a flood hazard map first so you do not misread a level as a forecast.
• Waterways. How far the nearest mapped river or creek is. See the waterways brief.
• Elevation and slope. Whether the site sits low relative to its surroundings, or on ground steep enough that cut-and-fill matters. See elevation and slope.
• Faults. The distance to the nearest mapped active fault, which is a design question for the structural engineer, not a sales question. The active faults brief explains how to read it.

The site will be reshaped, and that cuts both ways

Here is the honest complication with pre-selling. Developers grade, fill, compact, and build drainage. A site that screens as low today can be raised. A slope that screens as steep today can be benched and retained properly.

So the screening is not a verdict on the finished project. It is a list of things the developer must have handled, and it gives you the standing to ask:

1. Is the site being filled? By how much, and where does the fill come from? Fill raises the pad, and it also raises questions about compaction. Our post on filled and reclaimed land covers why.
2. Where does the project's drainage discharge, and who maintains it? Water leaving your subdivision has to go somewhere, usually into the same creek that was already there.
3. Was a geotechnical investigation done, and can you see the summary? Serious developers have one. Asking is normal.
4. What is the design flood level for the roads and the ground floor? If nobody can answer, that is information too.
5. Who owns and maintains the perimeter drainage after turnover? Often the homeowners association, which means you.

Ask these in writing, by email. A vague verbal answer and a written non-answer are different kinds of evidence.

Timing: screen before the reservation, not after

The sequence that saves money is simple:

1. Get the coordinates of the specific block and lot.
2. Run the hazard screening. It takes about a minute.
3. If anything reads high, ask the five questions above before paying.
4. If the answers are solid and in writing, proceed. If they are vague, treat that as part of the price.
5. Keep the report. At turnover, you will want to compare what was promised against what was built.

If you are weighing two projects against each other, the side-by-side method in comparing two lots works the same way for pre-selling units.

The honest limit

A hazard screening reads public national datasets at the coordinates you give it. For a pre-selling project it has one specific blind spot: it describes the land as mapped, not the land as it will be after the developer finishes with it. It cannot certify fill quality, drainage design, or workmanship, and it is not a substitute for a soil investigation on the built site. What it does is turn a glossy brochure into a conversation with specific questions, at the one moment when you can still say no for free.

CheckHazard does not replace a professional geotechnical or engineering survey.