There is a remarkably widespread — and stubbornly persistent — belief that tax deductions for home renovation are designed only for modestly budgeted projects. That if your bathroom features travertine marble or designer thermostatic tapware, the tax authorities regard you differently. The reality is precisely the opposite: the deduction does not depend on how much you spend, but on what energy efficiency improvements you achieve. And in our experience at Azulia, premium projects are precisely those that most readily meet the requirements.

We have seen clients forgo thousands of euros in deductions simply because they did not know they were entitled to them. Do not let this happen to you: if you are planning to renovate your bathroom in 2026, this guide is for you.

What deductions exist in 2026

The principal deduction currently in force is the income tax (IRPF) deduction for energy efficiency improvement works, originally regulated under Royal Decree-Law 19/2021 and successively extended through the 2026 fiscal year. There are three categories:

  1. 20% deduction for works that reduce heating and cooling demand by at least 7%. Maximum deduction base: 5,000 EUR per year per dwelling.

  2. 40% deduction for works that reduce non-renewable primary energy consumption by at least 30%, or improve the energy rating to class A or B. Maximum base: 7,500 EUR per year.

  3. 60% deduction for works in entire residential buildings (more applicable to owners’ associations). Maximum cumulative base: 15,000 EUR.

For an individual premium bathroom renovation, the first two categories are the relevant ones. And the good news is that many of the design decisions we make in our projects — insulation, LED lighting, efficient water systems — naturally fit these requirements.

The deduction is applied against the gross income tax liability, which means a real, direct saving on your tax return. In a 25,000 EUR project with efficiency improvements that meet the 7% threshold, we are talking about up to 5,000 EUR that you recover.

Premium renovations that qualify

This is where the myth dissolves. The elements that define a contemporary premium bathroom are, in many cases, the same ones that improve energy efficiency. It is no coincidence: good design and sustainability go hand in hand.

Replacement of sanitary ware and tapware with efficient models. Latest-generation dual-flush toilets and thermostatic tapware with flow control not only offer a superior experience — they reduce water consumption by between 30% and 50%. Brands such as Hansgrohe, Grohe and Roca have premium lines certified with water-efficiency labelling.

Improved insulation. In buildings constructed before 2006 in Valencia — which constitute the majority of the housing stock — bathroom walls typically have deficient thermal insulation. A full renovation that includes insulated stud lining contributes directly to reducing climate-control demand. The regulations of the Generalitat Valenciana establish specific thermal transmittance requirements which, when met, validate the deduction.

Designer LED lighting. The integrated lighting systems we use at Azulia — recessed LED profiles, indirect backlighting, mirrors with dimmable lighting — consume 80% less than conventional solutions. And their impact on the aesthetics of the space is incomparable.

Underfloor heating with efficiency improvement. If the project includes electric or hydraulic underfloor heating as part of a system more efficient than its predecessor, the investment is deductible. The sensation of stepping onto a warm floor each morning is, moreover, priceless.

Ventilation with heat recovery. In interior bathrooms or those with forced ventilation, mechanical ventilation systems with heat recovery improve overall efficiency and are a solution we always recommend in our full-scale projects.

How to apply, step by step

The process involves more bureaucracy than actual complexity. There are four steps:

1. Obtain the energy efficiency certificate BEFORE the works. This is essential, and we emphasise it at every first project meeting. You need an EPC (Energy Performance Certificate) issued by a qualified professional reflecting the prior state of the property. Approximate cost: 100-150 EUR in Valencia.

2. Carry out the works and obtain a second certificate AFTER. The subsequent EPC must demonstrate the improvement. The difference between both certificates is what justifies the deduction. Note: the post-works certificate must be issued before the end of the tax period in which you wish to apply the deduction (i.e., before 31 December of the fiscal year).

3. Keep all invoices. Invoices must be issued by professionals or companies, with VAT breakdown, and clearly reflect the energy efficiency improvement items. At Azulia, our estimates detail every line item, which greatly facilitates this step. If you want to see how we structure a project, this is how our process works.

4. Declare on the IRPF Form 100. The deduction is entered in the income tax return, in the section for energy efficiency improvement deductions. The Tax Agency publishes updated instructions annually. Your tax adviser will incorporate it without difficulty if you provide the certificates and invoices.

A detail many people overlook: you do not need the entire works to be energy-efficiency related. If your full renovation includes efficiency elements alongside purely aesthetic ones, only the portion corresponding to the energy improvement is deducted. But that portion can be substantial.

Reduced VAT on full renovations

In addition to the income tax deduction, there is another fiscal benefit that directly affects the budget: the reduced VAT rate of 10% versus the standard 21%.

For the 10% rate to apply, these conditions must be met:

  • The property must be more than 2 years old since its construction or last full rehabilitation.
  • It must be a private dwelling (not commercial premises or office).
  • Materials must not exceed 40% of the total cost of the works (including labour).
  • The works must be carried out by a company or professional, not as an independent materials purchase.

In a 20,000 EUR project, the difference between 10% and 21% is 2,200 EUR. That is a saving that warrants five minutes of attention before signing the estimate. If you wish to explore further, we have dedicated a full article to VAT on full renovations.

Correctly applying the reduced VAT and the income tax deduction in combination can mean savings of between 4,000 EUR and 7,000 EUR on a typical premium project. This is not a discount: it is your money, legitimately recovered.

Our recommendation

Having accompanied dozens of clients through this process, our recommendation is clear: obtain the energy certificate before touching a single tile. It is a one-day, 150 EUR procedure that can save you several thousand.

Even if you are not certain that your renovation will reach the improvement threshold, the prior certificate does not expire and leaves the door open. Without it, there is nothing that can be done after the fact.

We also recommend speaking with your tax adviser before you begin, not after. A good adviser can guide the structure of invoices and payments to maximise the benefit. In our experience, clients who plan their investment from the outset obtain not only a better aesthetic result — but a better fiscal one too.

And a note on what not to do: do not attempt to inflate the energy efficiency line items or present items that do not correspond. The tax authorities cross-reference data with certificates and invoices. Transparency is the best strategy, and when the project is well designed, the numbers speak for themselves.

If you want to see how much your project might cost — and how much you could recover — our budget calculator gives you a first indication in under two minutes.

Frequently asked questions

Does the deduction apply if I don’t change the overall energy rating of the property? Yes, provided you demonstrate a minimum 7% reduction in heating and cooling demand. You do not need to change your energy letter; a quantified improvement reflected in the certificates is sufficient. Many full bathroom renovations comfortably exceed that threshold.

Can I claim the deduction if the property is rented? Yes, but with nuances. If you are the owner and the property is let as the tenant’s main residence, you can apply the deduction. If it is a holiday let or tourist use, the regulations are more restrictive. Consult your specific case with a tax adviser.

What happens if I started the works in 2025 but finish in 2026? The amounts paid in each fiscal year are deducted in that year’s return. That is, what you paid in 2025 goes in the 2025 return, and what you paid in 2026 in the 2026 return. The post-works certificate can be issued upon completion. This has an advantage: distributing payments across two fiscal years allows you to take full advantage of the maximum deduction base in both.

Is it compatible with other grants such as the GVA’s Plan RENHATA? Generally yes, although you must verify that the total investment cost is not exceeded between deduction and subsidy. In our article on accessibility grants we detail how to combine both avenues. The general rule: total aid cannot exceed 100% of the amount invested.

A premium bathroom is not an expense: it is an investment in your daily quality of life. That this investment also offers a direct fiscal return makes it an even more intelligent decision. At Azulia, we ensure that every project is documented so that you do not lose a single euro that is rightfully yours. And if what holds you back is knowing where you should not cut corners in such a project, we have an answer for that too.