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Guide · Real estate

What gets checked before you buy a home

Before signing a deposit contract it pays to know exactly what you are buying. This is the index of a property due diligence: the nine blocks I review in a full report. It is not the report — it is the map, so you know what to ask and what not to take for granted. Last reviewed: 27 August 2026.

The nine blocks

01

Ownership and registry position

That the seller is the person entitled to sell, and holds full title. Chain of ownership, mortgages, charges, easements, attachments, life interests, resolutory conditions and pre-emption rights.

02

Cadastre and planning

That what stands on the ground matches what the papers say. Registry square metres against the cadastre, land classification, unlicensed works and whether they are time-barred, first occupancy licence, enforcement files and demolition orders.

03

Environmental constraints and risks

Flood risk, coastal public domain, forestry land, drovers' roads, heritage or archaeological protection. This is what limits what you can do with the property, and what almost nobody checks.

04

Tax position

Council tax and charges up to date, registered tax encumbrances, and the comparison between the agreed price and the cadastral reference value — on which your transfer tax and the risk of a valuation review depend.

05

Tenancies and occupation

Whether there are tenants, under what contract, since when, and whether they have pre-emption rights. If it is occupied without title, the exact situation and what it entails.

06

Building association

Outstanding debt owed by the seller, levies already approved but not yet billed, bylaws and minutes from recent years. This is where the expensive surprises show up: a facade refurbishment voted through last month.

07

Technical documentation and utilities

A valid energy performance certificate, occupancy declaration or habitability certificate, building inspection report where applicable, and water, electricity and gas connection contracts.

08

Inventory and condition of the property

What is included in the price and the condition it is handed over in, with a closed inventory and photographs. Structural condition is work for an architect or surveyor, not a lawyer: the two reviews complement each other.

09

Executive summary and risk traffic light

The eight blocks above are worthless without a conclusion: what is a flat no, what gets negotiated on price, what gets made a condition of the deposit contract, and what documentation is still missing before signing.

The three moments when this matters

  • Before signing the deposit contract. It is the only moment when finding a problem is free: you walk away, or you use it to negotiate the price.
  • Between deposit contract and completion. There is a penalty now, but you can still make completion conditional on the seller fixing it. That depends on how the deposit contract is drafted.
  • After completion. Now we are talking about remedies for hidden defects, rescission of the contract or a damages claim. In other words, the courts.

What the notary does not check

This is the most common misunderstanding. The notary verifies title and the charges registered at the Land Registry on the day of signing, and warns you of what appears there. They do not check the planning position, or unlicensed works, or debt to the building association, or approved levies, or environmental constraints, or whether the price is below the reference value. All of that you either review beforehand, or discover afterwards.

What you have just read is the index. The report is something else

A real due diligence runs to fifteen or twenty pages: each block broken down into points verified one by one against the Land Registry, the cadastre, the council and the building association, with the risk traffic light, the alerts found, the documentation still to be provided and the specific clauses to be written into the deposit contract to protect you. It is a service with a lawyer accountable behind it, not a template to fill in.

Ask me for a report

Frequently asked questions

Does the notary or the bank not already do this?+

No. The notary checks registered charges on the day of signing. The bank values the property to decide how much to lend, not to protect you. Neither reviews planning, building-association debt, tenancies or the risk of a tax valuation review.

What if I am buying off-plan or a new build?+

The focus shifts but the review is still needed: building licence, bank guarantee or insurance for the sums paid on account, ten-year structural insurance, the specification schedule as part of the contract, and delivery dates with penalties. Different risks, not smaller ones.

How long does a due diligence take?+

With the basic documentation provided, five to ten working days is normal. Timescales stretch when certificates have to be requested from the council, or when the seller cannot find paperwork for older building works.

I am buying from abroad — is this useful for me?+

That is precisely where it shows most. You add the NIE, opening a bank account, the applicable matrimonial property regime, the 3 % retention if the seller is non-resident, and wealth tax planning. The whole process can be handled by video call and power of attorney.

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If you are about to buy or sell

This guide is general information. Before you sign a deposit contract, see how I can help with real estate.

Your case

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With the land registry extract and the cadastral reference I can already tell you whether I see red flags and whether the full report is worth it.

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