Analyze a house before buying

Analyze a house before buying and decide with data, not hunches

Before buying a house you should analyse five things: the building condition (age, technical inspection, renovation), the real market price vs. the asking price, the physical risks (flooding, radon, seismic hazard, wildfires), the land constraints and the surroundings (industry, power lines, noise). With Hogarfax you analyse any property or plot from the address or the cadastral reference, with 25+ checks on official sources. Start free; the full analysis with PDF costs €24.90 (VAT included).

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What to check before buying a house

These are the points we analyse in every property, grouped by block. Each one relies on an official public source.

Property

  • Complete cadastral profile: use, floor areas, age and units
  • Advertised floor area compared with Cadastre
  • Property age and indicative renovation cost
  • Habitability indicators based on floor area
  • Issues contributed by other users (when available)
  • Estimated ITE/IEE status by type and age
  • Energy performance certificate: rating and date when on record

Price, costs and history

  • Asking price compared with the area's real market
  • Purchase cost summary: transfer tax (ITP), notary, land registry and administration at real legal rates
  • Estimated rent for the property: official and market reference
  • Property history: timeline, observed listings and other users' contributions
  • Price witnesses observed on the street, neighbourhood, district, postcode or municipality (when available)

Natural hazards

  • River, coastal and historical flooding where official event mapping exists
  • Potential exposure to radon gas
  • Local seismic hazard
  • Wildfire risk: forest, recent fires and active fire

Land use and restrictions

  • Planning classification and land class
  • Livestock trails: cañadas and rights of way
  • Coastline and watercourse constraints, including provisional DPH where official mapping exists

Surroundings and nuisances

  • Proximity to power lines, roads, railways, airports or dams
  • Industrial areas in the surroundings (industrial land)
  • Relevant industrial facilities (intensive farms, landfills, incinerators…)
  • Nearby energy facilities: wind, nuclear, thermal and more

Plus

  • Facade photo and aerial views at different heights
  • Printable question sheet for the seller, generated from your own alerts
  • Area services page: proximity radar, schools, healthcare, transport and nearby amenities
  • Historical aerial evolution annex with the official epochs available for the area

Free exploration

0 € · no account

Start with the essentials for free: cadastral record, facade photo, market price, surfaces and habitability.

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Public records + proprietary analysisReal reports from users in the fieldNo subscription — one-time paymentSatisfaction guarantee: refund if the report fails or doesn't match your property

Analyze that house before taking the step

Enter the address or cadastral reference and get the full analysis of the property in seconds.

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Frequently asked questions

What should you check before buying a house?

Five blocks: the building condition (age, mandatory technical inspection, renovation cost, habitability), the real market price vs. the asking price and surface discrepancies, the physical risks (flooding, radon, seismic hazard, wildfires), the land constraints (urban classification, easements, power lines) and the surroundings (industry, noise from roads, trains and airports). Hogarfax checks all of this automatically.

How do I analyse a house before buying it?

Enter the address or the cadastral reference. Hogarfax locates the plot, cross-references official public data and generates an analysis with 25+ checks in seconds. You can start free and without an account; the full analysis, with all risks, surroundings, the plot viewer and the PDF, unlocks for €24.90 (VAT included).

Does analysing a house online replace a technical inspection?

No, it complements it. The online analysis tells you where to look with official data (risks, land, surroundings, price) before investing time and money. An in-person technical inspection, an official valuation and the Land Registry extract are still recommended; the analysis helps you decide whether that property deserves those steps and negotiate with arguments.

Can I analyse a second-hand house from a portal like Idealista?

Yes. With the approximate address or the cadastral reference from the listing you can analyse the property before calling or visiting. It is a fast way to rule out properties with serious problems (flood zones, easements, industrial surroundings) and to detect discrepancies between what the listing says and what the Cadastre records.

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