Start with the transaction, not a generic checklist
The document review should answer a commercial question: can you acquire the property described, use it as intended and fund the purchase without taking on unacceptable liabilities? An apartment for permanent residence, a country house with a pool and an off-plan investment require different evidence. Write down the intended use, essential features, financing assumptions and proposed completion date before asking the seller for documents. This gives the review a purpose and prevents a large folder from creating false confidence.
Separate evidence that identifies the asset from evidence that proves its legal condition. A photograph may establish that a pool exists; a cadastral entry may describe it for administrative purposes; a building licence may authorise it. None performs all three functions. The final review should connect each conclusion to the document that actually supports it.
Legal framework and sources: BOE · Real Decreto 515/1989, información sobre viviendas ↗BOE · Ley Hipotecaria ↗BOE · Texto refundido de la Ley de Suelo y Rehabilitación Urbana ↗
Identify every property and every necessary signatory
Obtain the seller’s acquisition deed and current Registry information for every included unit. A garage may be a separate registered property, an inseparable annex or a share carrying an exclusive parking right. These arrangements are not interchangeable. Compare the unit number, floor, boundaries, Registry number and any CRU with what you visited. An address alone can conceal a mismatch, particularly after street renumbering or an internal subdivision.
Check whether the seller owns full title, a share, bare ownership or usufruct. An inheritance, divorce, company sale or power of attorney introduces additional documents and signatories. The conveyancer should determine what evidence of authority or consent is necessary, including applicable matrimonial rules. A seller’s passport and a statement that the family agrees do not establish that every person whose participation is required will validly sign.
Legal framework and sources: BOE · Ley Hipotecaria ↗
Reconcile the three descriptions of the property
Create a short comparison of the Registry description, cadastral information and physical observations. Record plot area separately from built area, useful internal area, terraces, pool and outbuildings. Check the basis of each measurement: a cadastral total may include common elements, whereas a sales brochure may count external space differently. A difference becomes meaningful only after comparing like with like.
Ask a competent technician to investigate unexplained discrepancies and prepare a measured plan where necessary. The legal review then establishes whether the issue concerns an old description, an incorrect boundary, an unrecorded extension or an unauthorised use. Each leads to a different solution. Do not accept a promise to “update the paperwork” without identifying the procedure, required consents, likely costs and whether completion should wait for its successful outcome.
Legal framework and sources: BOE · Ley Hipotecaria ↗BOE · Texto refundido de la Ley de Suelo y Rehabilitación Urbana ↗
Establish what the municipality authorised
Request the relevant planning and building file, not just the most favourable certificate available. Depending on the property, this includes the licence and approved plans, completion documentation, occupancy instrument, later alterations, enforcement proceedings and the planning rules affecting the parcel. Names and procedures differ between autonomous communities. Ask the municipality a precise question identifying the property and proposed use, rather than requesting a general assurance that it is “legal”.
An absence of pending enforcement proceedings does not necessarily prove that everything built was authorised. Likewise, a completed Registry entry does not establish that a future extension or holiday rental will be permitted. Where a certificate is limited to current files or a particular date, preserve that limitation in the report. Buyers need to understand the remaining uncertainty before deciding whether it can be managed contractually.
Legal framework and sources: BOE · Texto refundido de la Ley de Suelo y Rehabilitación Urbana ↗
Separate registered charges from everyday liabilities
Request current mortgage redemption figures, community debt certification and available municipal tax information. Registry mortgage liability is not the amount needed to repay the loan. The completion statement must use the lender’s actual redemption figure for the relevant date and provide for the cancellation process. An attachment requires evidence from the competent creditor or authority and an effective route to its Registry cancellation.
Community debt deserves particular attention because the acquired unit can answer for qualifying arrears attributable to the elapsed part of the acquisition year and the preceding three calendar years under the national Horizontal Property Act. Do not routinely waive the seller’s debt certificate. Read meeting minutes and budgets as well: a certificate showing no overdue instalments may say little about an approved roof replacement or future contributions. Regional civil rules can require separate analysis outside this national framework.
Legal framework and sources: BOE · Ley Hipotecaria ↗BOE · Ley 49/1960, propiedad horizontal ↗BOE · Ley Reguladora de las Haciendas Locales ↗
Check occupation, services and the right to use amenities
Confirm who occupies the property and on what basis. Where there is a tenancy, obtain the complete agreement, amendments, payment information and evidence relevant to any acquisition rights. Vacant possession should be an express completion obligation when that is what you are buying, supported by a practical handover arrangement. A seller’s undertaking cannot safely be treated as proof that an existing occupant will leave.
Ask for utility contracts and recent bills, but distinguish a functioning connection from an authorised supply serving the correct dwelling. In rural properties, examine water rights, wastewater arrangements and legal access. In a development, verify the legal basis for using pools, gardens and parking. Physical access or years of informal use may not establish ownership or an enforceable entitlement that survives a change of neighbour, community policy or service operator.
Legal framework and sources: BOE · Real Decreto 515/1989, información sobre viviendas ↗BOE · Ley Hipotecaria ↗
Use technical documents for the question they answer
The energy certificate, technical inspection, valuation and building survey address different questions. The energy certificate describes modelled energy performance; a lender’s valuation addresses security value under its applicable standards; a condition survey investigates defects within its agreed scope. A favourable result in one document does not validate the others. Check the subject property, inspection date, professional qualifications, exclusions and supporting photographs.
For new or substantially altered buildings, ask about the building book, completion and reception records, insurance and maintenance information. For older buildings, establish whether mandatory inspections are current and whether identified defects have actually been remedied. Cost the unresolved works and distinguish work inside the apartment from collective work to the structure or façade. The relevant purchasing decision is the likely obligation and disruption you will inherit, not simply whether a certificate exists.
Legal framework and sources: BOE · Texto refundido de la Ley de Suelo y Rehabilitación Urbana ↗BOE · Real Decreto 390/2021, certificación energética, texto vigente ↗
Turn unanswered questions into contractual protections
Classify outstanding matters by consequence: identity or title, lawful use, finance, material cost and ordinary administration. A missing document may be easily replaceable, but it may also prevent a reliable answer on a fundamental issue. Set a responsible person, a deadline and the evidence that will count as resolution. Where your decision depends on that evidence, negotiate the deposit and purchase contract before paying.
Possible protections include a condition linked to satisfactory documentation, a seller obligation to complete a specified rectification, an agreed price adjustment or a carefully controlled retention. These mechanisms are not interchangeable. A retention needs a reasoned amount, permitted uses, proof of expenditure and release rules; it cannot legalise a prohibited building. Ensure the contract explains what happens if the necessary authorisation or cancellation is refused, not only if the seller is late producing a document.
Legal framework and sources: BOE · Real Decreto 515/1989, información sobre viviendas ↗BOE · Texto refundido de la Ley de Suelo y Rehabilitación Urbana ↗
An example: the garage that was not included
In this fictional transaction, an apartment is advertised with a numbered underground space. The seller provides a nota simple for the apartment and community receipts mentioning a garage. The buyer initially treats the garage as checked. Examination of the acquisition deed shows that the apartment has no garage annex; the parking right belongs to a separate share acquired by the seller’s former spouse.
The solution is not another apartment certificate. The legal team must identify the parking title, verify who can transfer it and agree its inclusion, price allocation and execution arrangements. If that cannot be achieved, the buyer must decide whether an apartment without parking still meets the agreed bargain. Discovering the problem before paying an unconditional deposit preserves that choice and illustrates why matching documents to each promised asset matters more than collecting a standard list.
Legal framework and sources: BOE · Ley Hipotecaria ↗
Refresh the evidence before completion and retain the audit trail
Documents age at different speeds. Building history may remain relevant for years, whereas Registry charges, occupation and redemption balances can change during the transaction. Agree which searches and certificates must be refreshed for completion and arrange a final physical inspection close to handover. The notarial and Registry steps do not remove the need to resolve issues identified in the buyer’s earlier review.
Keep originals, issue dates, verification details and the written answers that explain discrepancies. The completed file should show what was established, what remains qualified and which obligations continue after purchase. Include responsibility for any post-completion registration, cancellation or document delivery. This becomes useful when selling, refinancing, making an insurance claim or planning alterations. A properly organised acquisition file protects the future ownership of the home as well as the day of purchase.
Legal framework and sources: BOE · Ley Hipotecaria ↗BOE · Ley 49/1960, propiedad horizontal ↗
Sources & further reading
BOE · Real Decreto 515/1989, información sobre viviendas ↗BOE · Ley Hipotecaria ↗BOE · Ley 49/1960, propiedad horizontal ↗BOE · Texto refundido de la Ley de Suelo y Rehabilitación Urbana ↗BOE · Real Decreto 390/2021, certificación energética, texto vigente ↗BOE · Ley Reguladora de las Haciendas Locales ↗Editorial preview: professional legal review is pending. This guide provides general information and does not determine the legal position of a particular property.
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