Off-market due diligence: from the land registry to the energy certificate

Buying an off-market asset means accepting that the information is not exposed on a portal. There are no professional photos, no automatic comparables, no intermediary filtering out risks. The buyer takes control of the process. That is why due diligence is not just another step: it is the process. Below is a 10-step checklist for investing safely in assets that do not trade on the mass market.

1. Cadastral reference and ownership

The cadastral reference is the property's ID. It allows you to check the official description: surface area, use, address, plot and owner. The first check is that the seller appears as the registered owner or has sufficient power to transfer. Mismatches between the cadastre and the land registry are warning signs, not administrative details.

2. Land registry extract (nota simple)

The nota simple informativa from the Property Registry confirms ownership, charges, limitations and the history of transfers. Look for:

• Outstanding mortgages and their amounts.
• Embargoes or preventive annotations.
• Easements, usufructs or sale conditions.
• New-build registrations or partial divisions.

An asset with charges is not unviable; it simply forces you to calculate the true cost of entry.

3. Price/m² vs. area

The asking price only makes sense in comparison. Notarial data is the anchor:

| Property type | Average national price m² | |:-------------------|---------------------------:| | New-build flat | 2.970 € | | Second-hand flat | 2.197 € | | All types | 1.958 € | | House or chalet | 1.443 € |

From there, cross-check with province, municipality, postcode and even street. A flat at 2,000 €/m² can be a bargain in central Madrid or a mistake in a province averaging 1,200 €/m².

4. State of conservation

The state of conservation determines the real cost of entry. Cracks, damp, obsolete installations or a poor roof are not aesthetic issues: they are euros. Ideally, visit with a technician and photograph every critical area. In off-market deals, the seller sometimes prefers not to show defects; the buyer must find them.

5. Age and renovations

The age of the building conditions the applicable regulations, maintenance costs and appeal to future buyers. In Spain, 70% of the housing stock was built before 1990. That is not a flaw, but it is an indicator of installations to review. Check:

• Year of construction and last façade or roof rehabilitation.
• Energy efficiency certificate.
• State of plumbing, electrics and exterior carpentry.
• Building technical inspection (ITE), if applicable.

6. Energy certificate A-G

The energy efficiency certificate (CEE) has become a pricing variable. A poor label not only raises the energy bill; it reduces the sale price and exposes the owner to regulatory obligations.

From 2027, European regulation will require the new A-G label for buildings over 500 kW. In the medium term, the 2029 minimum performance standards will penalise obsolete assets. Buying a property with an E or F label today means buying a regulatory liability.

| Label | Scenario | |:---------|:----------| | A/B | Assets with premium, lower regulatory risk. | | C/D | Current standard; check whether targeted upgrades pay off. | | E/F/G | High hidden cost; energy renovation almost mandatory. |

7. Layout and useful floor area

Built area, useful area and layout define real value. A poor layout can subtract more value than missing metres. Check that the cadastral surface area matches reality and that the layout allows the intended use: residential rental, coworking, tourist use or resale.

8. Orientation and location

The exact location is as important as the postcode. Same street, different orientation, different price. Check:

• Sun exposure and noise.
• Proximity to transport, services and green spaces.
• State of the building and the street.
• Urban planning prospects: special plans, protection or new amenities.

9. Charges and encumbrances

Beyond the mortgage, review pending taxes, communities of owners with debts, building works approved but not paid, and business licences. An imminent special levy can turn a good purchase into a bad investment.

10. Renovation feasibility

The final step is to calculate whether the asset allows the required renovation. This includes:

• Required licences: rehabilitation, change of use, extension.
• Estimated renovation cost per m².
• Post-renovation margin vs. market price.
• Impact on the CEE and on future profitability.

The hidden cost of the CEE

The energy certificate is not a formality. It is a hidden cost that conditions the exit. In off-market deals, where the buyer has more negotiating room, a poor label is a lever to reduce the price. But only if detected before the offer.

Conclusion

Off-market rewards those who do the homework. There is no listing that structures the process, so the investor must structure it themselves. Every point on this checklist reduces uncertainty and protects margin. In singular assets, due diligence is not bureaucracy: it is competitive advantage.