How to read the result

What it means

  • What public records say today about the building and its surroundings.
  • A level in words alongside the facts behind it.

What it does not mean

  • A probability percentage.
  • An in-person check of the building's physical condition.

The steps behind every report

You start with an address or a cadastral reference and confirm the building and, if you wish, the specific flat. With that identity we query each official source at that moment and record what it returned, when, and for which scope: plot, building or municipality.

Then the report is written automatically from fixed texts, without artificial intelligence: the summary and the text of each check come only from that data, so no figures, sources or dates can appear that the queries did not return. Paid reports get an AI summary shortly afterwards that explains the report by priority; fixed rules check that it adds no figures and changes no level.

A traffic-light rating for every check

Each check shows one of three states: ✓ no alert (the source answered and nothing calls for action), ⚠ worth noting (there is a specific fact to look into before you buy, and the report says which) and ○ no data (the source did not answer that day, does not cover the area, or the check is not available yet).

A ○ never turns into a ✓ for lack of information. Where a threshold is set by HOUSINGFAX rather than by a regulation, the report says so.

Levels in words, not percentages

When a check deals with probability, such as the aluminosis check (the deterioration of floor joists made with high-alumina cement, found in some older Spanish buildings), it uses five levels: very low, low, moderate, high or very high. Each level rests on cited facts: the year of construction with its source, and what the building inspection (ITE or IEE) says when the regional register holds one.

We do not publish percentages because there is no independently validated model that could back such a figure honestly. A level in words, with its reasons, says what we know without suggesting precision that is not there.

Separate questions, separate answers

The safety of the building, the risks of the site, the convenience of the area and the economics of the purchase are different questions and are never blended into a single score. A good location does not offset a structural risk or change the aluminosis level.

When two official sources disagree, for instance on the year of construction, the report shows both and uses the older one as the cautious choice; it does not discard the one that does not fit.

Try it on your own home

The sample report shows this method applied to a real building, with anything that identifies the property blurred: traffic lights, sources, dates and points to check.

To see the traffic lights for your own home, the free report shows the cover page, the title and the state of every check at no cost. The Essential report (€11) and the Complete report (€19) unlock the detail and the PDF.

What the report does not do

The report gathers what public records say and tells you what to look into. It does not visit the building, take samples or run tests, and it is not a substitute for an on-site technical inspection of the building, a valuation or advice from a professional.

Nor does it work out a target price or a discount: it shows official reference sale and rental prices so you go into the negotiation with context.

Short answers

Who decides the traffic light for each check?

Fixed thresholds defined for each check and applied to the data from its source. The aluminosis level is calculated by a versioned rules engine from the year of construction and the cited facts. No text, including the AI summary, can change or contradict it.

Do you use artificial intelligence?

Only for the AI summary of paid reports. The report itself, free or paid, is generated automatically without artificial intelligence from official data, with fixed texts and the levels set by the rules. An AI model then writes the AI summary: the priorities in plain language and, if the building inspection is on record, its defects, to read on screen or download as a PDF. It works only with facts from the report, without the address or any details of the person ordering it, and fixed rules check that it adds no figures and changes no levels.

What happens if an official source does not respond?

That check is shown as “no data” with the reason, and the rest of the report is delivered as normal. No data does not mean there is no problem.

Why don't you give a probability percentage?

Because no independently validated model backs such a figure. We use five levels in words, from very low to very high, with the facts that support them.

Does the method change over time?

Yes, when a source is added or a rule is adjusted. Each report keeps the version it was produced with and is never rewritten afterwards.

Official sources you can consult

The links let you review the primary source. Their inclusion does not widen their purpose or turn a piece of context into a diagnosis.