New Construction 2026: Building Book Mandatory for Registration

Key data

If you are about to execute a new construction and do not have the Building Book ready, the Property Registry can block your registration. It is not a minor procedure: without property registration you cannot sell, mortgage or fully prove ownership of the property.

The Resolution of March 25, 2026 from the General Directorate of Legal Security and Public Faith resolves an appeal filed against the property registrar of Benissa, who suspended the registration of a single-family home for three reasons: lack of the Building Book, absence of the energy efficiency certificate and lack of accreditation of the license conditions. The General Directorate confirms the suspension in all its terms.

What does this regulation establish?

The resolution clearly sets out the documentary requirements for registering a completed new construction in the Property Registry. The three documents whose absence motivated the suspension are:

• Building Book: mandatory in general according to articles 9.a and 202 of the Mortgage Law. It must be deposited in the Registry. In the Comunitat Valenciana, Decree 25/2011 requires that a copy of the book be provided accompanied by a notarial deed.
• Energy efficiency certificate: additional requirement that must be provided together with the new construction documentation.
• Accreditation of license conditions: the developer must demonstrate that the conditions imposed in the construction license have been met.

The resolution clears up a very widespread doubt: self-promoters are not exempt from the obligation to provide the Building Book. The only recognized exception is for old buildings for which such a book was not required at the time of their construction.

Economic and operational impact

The impact is not a direct fine, but its economic consequences are equally real. A suspended registration in the Property Registry blocks:

• The sale of the home: no buyer with a mortgage can close the transaction without property registration.
• The constitution of a mortgage: banks require prior registration to formalize mortgage loans.
• The delivery of keys in developments where the contract conditions delivery on registration.
• The costs of delay: additional notarial fees, possible contractual penalties and the cost of preparing or recovering the Building Book if it was not preserved.

For developers with multiple units in the same development, the suspension can affect all of them simultaneously, multiplying the financial and reputational impact.

Who does it affect?

• Real estate developers who execute completed new constructions in any autonomous community.
• Builders who also act as developers in their own projects.
• Self-promoters (individuals who build their own home): the resolution expressly confirms that they are not exempt.
• Notaries who authorize new construction declaration deeds: they must verify that the documentation is complete before authorizing.
• Developers in the Comunitat Valenciana: they have an additional requirement under Decree 25/2011, which requires a notarial deed together with a copy of the Building Book.

Practical example

A self-promoter builds a single-family home in Benissa (Alicante) and goes to the notary to execute the completed new construction. He provides the final work certificate and the first occupancy license, but does not deliver the Building Book or the energy efficiency certificate.

The property registrar of Benissa suspends the registration. The self-promoter appeals arguing that, being a self-promoter, he should not be obligated to deposit the Building Book. The General Directorate of Legal Security and Public Faith dismisses the appeal and confirms the suspension: articles 9.a and 202 of the Mortgage Law do not establish any exception for self-promoters, and Decree 25/2011 of the Comunitat Valenciana additionally requires that the copy of the book be accompanied by a notarial deed.

Result: the registration is paralyzed until the three defects indicated are remedied, with the costs and delays that this implies for any subsequent transaction on the property.

What should companies do now?

1. Verify that the Building Book is prepared and available before going to the notary to execute the new construction. Do not wait until the last moment: its preparation can take weeks.
2. If you operate in the Comunitat Valenciana, also prepare the notarial deed that must accompany the copy of the Building Book, as required by Decree 25/2011.
3. Obtain the energy efficiency certificate of the completed building with sufficient advance notice before the deed.
4. Accredit compliance with license conditions through the documentation required by the corresponding municipality.
5. Coordinate with the notary the review of all documentation before setting the deed date, to avoid property registry suspensions that paralyze sales or mortgages.
6. If you are a self-promoter, do not assume that you are exempt: the resolution confirms that the Building Book obligation applies to you just as it does to any professional developer.

Official source

Consult complete regulation in official source

Notice: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-14986