The Energy Certificate of Your Home in 2026: What You Need to Know Before Renting

# The Energy Certificate of Your Home in 2026: What You Need to Know Before Renting

If you plan to put a property up for rent in 2026, the energy certificate of the home is not optional: it is a legal requirement without which you cannot sign the contract or advertise the property. Additionally, after the transposition of the European directive on energy efficiency (revised EPBD), this document has become the key to deductions in the IRPF and the ICO Young Guarantee. Ignoring it can cost you between 300 and 6,000 € in fines, depending on the autonomous community.

What is the energy certificate and why is it mandatory for renting in 2026?

The energy efficiency certificate is an official document that evaluates the energy consumption of a building or home and assigns it a rating from A (most efficient) to G (least efficient). It includes data on the estimated consumption of non-renewable primary energy, CO₂ emissions, and recommendations for improvement.

Its obligation in Spain starts from the Royal Decree 235/2013 (BOE-A-2013-3904), which transposed the European directive 2010/31/UE. In 2026, the progressive implementation of the measures derived from the revised EPBD directive (2024/1275/UE) reinforces this obligation and establishes new deadlines for residential buildings to reach minimum efficiency standards, with particular pressure on properties rated F and G.

When is it exactly mandatory?

• When renting a home or commercial space.
• When selling a property.
• When advertising the property on any portal or advertising medium (the energy rating must appear).
• To access rehabilitation subsidies and certain financial products like the ICO Young Guarantee 2026.

The certificate must be registered with the competent autonomous body before signing the contract. Having it on paper alone is insufficient: without an official registration number, it lacks legal validity (Ministry of Housing and Urban Agenda, vivienda.gob.es).

Requirements, documentation, and who can issue the energy efficiency certificate

Only a qualified technician can issue the energy certificate. According to the Royal Decree 235/2013 (BOE-A-2013-3904), qualified technicians are considered:

• Architects and architectural technicians (architects).
• Engineers (industrial, civil, telecommunications, etc.) with authorizations in the field of construction.
• Certification companies accredited that have qualified technicians on staff.

There is no single professional association that centralizes the registry: each autonomous community manages its own registry of technicians and certificates (IDAE, idae.es).

Documentation you must prepare as the owner:

• Cadastral reference of the property.
• Floor plans of the home (if you have them; if not, the technician can draft them).
• Energy supply bills for the last 12 months (gas, electricity).
• Information on installations: boiler, heating/cooling system, type of windows and insulation.

The more complete the documentation, the more accurate and faster the process will be.

How much does the energy certificate cost in 2026: prices by autonomous community and factors that increase them

The price of the energy certificate in 2026 is not regulated by law: each technician sets their fees freely. However, the usual market ranges, according to sector data and references from the IDAE, are as follows:

Estimated ranges based on market references in 2026. Consult updated quotes with technicians in your area.

Factors that increase the price:

• Area over 150 m²: the cost can increase by 30-50%.
• Old homes without documentation: the technician must perform additional measurements.
• Urgency: some technicians apply supplements for deadlines under 5 business days.
• Travel: in rural or hard-to-reach areas, a travel cost may be added.
• Autonomous registration fees: some communities charge between 10 and 30 € for the official registration of the certificate.

Example: A property owner in Valencia with a 90 m² home built in 1985 may pay between 120 and 160 € for the certificate plus the autonomous registration fee. If the home lacks plans and has undocumented installations, the estimate can rise to 200 €.

How to obtain the energy certificate step by step: from the technician to the autonomous registry

The complete process has four distinct phases:

Phase 1 — Hiring the technician

Request at least three quotes from qualified technicians. Verify that the technician is registered with the corresponding professional association or the autonomous registry of certifiers. You can search for technicians in the IDAE database (idae.es) or in the associations of architects and engineers in your community.

Phase 2 — Visit and data collection

The technician visits the home to inspect the insulation condition, heating, cooling, and hot water installations, and the quality of the building envelopes. The visit lasts between 30 minutes and 2 hours depending on the size and complexity of the property.

Phase 3 — Certificate preparation

The technician inputs the data into the homologated software (CE3X, CE3 or CERMA, depending on the autonomous community) and generates the certificate with the energy rating. The usual timeframe is 3 to 7 business days from the visit.

Phase 4 — Autonomous registration

The technician (or the owner, depending on the community) submits the certificate to the competent autonomous body for registration. Once registered, you obtain the official registration number, which must appear in the rental contract and property advertisements.

Main autonomous registries:

• Madrid: Community of Madrid — Council of Environment.
• Catalonia: Catalan Energy Institute (ICAEN).
• Andalusia: Andalusian Energy Agency.
• Valencian Community: IVACE Energy.
• Consult the competent body in your community on vivienda.gob.es.

Estimated total time: between 5 and 15 business days from hiring the technician to obtaining the registration number.

Fines, tax deductions, and subsidies linked to the energy certificate: how to turn a mandatory procedure into real savings

This is the point most property owners are unaware of: the energy certificate is not just a requirement, it is also the mandatory document to access significant fiscal and financial benefits.

Fines for renting without an energy certificate in 2026

Renting without a valid certificate or failing to include the energy rating in the advertisement constitutes an administrative infraction defined in the Royal Decree 235/2013 and developed by each autonomous community. The fines vary:

• Minor infraction: between 300 and 600 € (e.g., not including the label in the advertisement).
• Serious infraction: between 601 and 1,000 € (renting without a registered certificate).
• Very serious infraction: up to 6,000 € in communities like Catalonia or the Basque Country, especially if there is recidivism.

The exact amounts depend on the applicable autonomous legislation in each territory. Consult your community's legislation to know the applicable sanction regime.

Tax deductions in IRPF 2026 linked to the energy certificate

The energy certificate is the mandatory starting point to access deductions for energy efficiency improvement works in homes, regulated by the IRPF Law and developed by the AEAT (agenciatributaria.es). For the 2026 income tax return, the current deductions according to applicable legislation include:

• Deduction for reduced demand for heating and cooling: requires proof of a minimum 7% reduction in the sum of the demand indicators, through two energy certificates (before and after the works).
• Deduction for improved consumption of non-renewable primary energy: requires a minimum 30% reduction or achieving an energy rating of A or B, proven by pre- and post-work certificates.

Example of tax savings: If a property owner invests 8,000 € in improving the insulation of their home and proves with the energy certificates a 35% reduction in non-renewable primary energy consumption, they could apply the corresponding deduction on that investment. Consult the percentages and maximum bases updated on the AEAT (agenciatributaria.es), as they may vary according to the applicable legislation in the 2026 tax year.

The energy certificate as a requirement for the ICO Young Guarantee 2026

The ICO Young Guarantee (ICO, ico.es) that facilitates access to the purchase of a first home includes among its eligibility criteria energy efficiency standards of the property. In 2026, according to the conditions published by the ICO, homes with energy ratings F or G may be excluded from certain guarantee lines or subject to more restrictive conditions. Consult the updated conditions directly on ico.es before starting the application.

This means that, as a property owner selling, having a certificate with a rating of D or higher expands the pool of potential buyers who can access subsidized financing.

Energy rehabilitation subsidies: the certificate as the key to access

The subsidies from the Recovery Plan (Next Generation EU funds) channeled through the IDAE and the autonomous communities for energy rehabilitation — such as the Building Energy Rehabilitation Program (PREE) and its successors in 2026 — require in all cases:

1. An energy certificate before the works that proves the initial condition.
2. An energy certificate after the works that demonstrates the improvement achieved.

Without the pre-work certificate, there is no subsidy. It's that simple. Consult the open calls in your autonomous community and on idae.es to know the deadlines and allocations valid in 2026.

Do you want to know if your home meets the requirements to access these subsidies? Use our energy efficiency calculator to estimate the improvement potential of your property and the associated tax benefits.

Sources and reference legislation

• Ministry of Housing and Urban Agenda — Energy certification of buildings: vivienda.gob.es
• IDAE (Institute for Diversification and Energy Saving) — Energy certificate registry and CE3X software: idae.es
• BOE — Royal Decree 235/2013, of April 5, approving the basic procedure for the energy efficiency certification of buildings (BOE-A-2013-3904): boe.es
• AEAT — Deduction for energy efficiency improvement works in homes (IRPF 2026): agenciatributaria.es
• ICO — Guarantee line for young people and conditions linked to energy efficiency 2026: ico.es
• Revised EPBD Directive — Directive 2024/1275/UE of the European Parliament and of the Council, relating to the energy efficiency of buildings. /think