Ventanas Fraktal

Window Subsidy Calculator

Calculate how much you can save with tax deductions and subsidies for window replacement in 2026

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How to Claim Window Replacement Subsidies in Spain (2026)

Replacing your old windows with energy-efficient units is one of the few home improvements the Spanish state actively pays you back for. In 2026 there are two independent routes to recover a large share of the cost — a personal income-tax deduction (deducción en el IRPF) and a direct Next Generation EU grant. Understanding the difference is the key to getting the most back, so here is exactly how each one works and how to apply.

1. The IRPF energy-efficiency tax deduction

This is a deduction on your annual income-tax return (declaración de la Renta). You pay the installer in full, then reclaim a percentage of the invoice from Hacienda in the following tax season. The percentage depends on how much your new windows improve the home's energy performance:

  • 40% deduction — if the works improve the property's energy rating (for example by two letters) or substantially cut its non-renewable primary energy use.
  • 20% deduction — if the works reduce the home's heating and cooling demand by at least 7%.

The deduction is calculated on the amount you actually paid (materials, installation and VAT), and it applies to your primary residence — or a home you rent out to a tenant as their main dwelling. Second homes and holiday properties do not qualify for the IRPF deduction, though they may still be eligible for direct aid.

2. Next Generation EU direct grants

Separately from the tax deduction, regional programmes funded by Next Generation EU can cover up to 40% of the cost, capped at around €3,000. Unlike the IRPF route, this is money paid toward the project rather than reclaimed on your tax return. Availability and exact conditions vary by comunidad autónoma, and some regional calls open and close on fixed windows — so timing matters.

Good to know: the two routes are not mutually exclusive. Our specialists routinely combine a direct grant with the IRPF deduction on the remaining balance, which is how the calculator above can show total savings of up to 80%.

3. The energy certificate — the one document you cannot skip

Every route hinges on an Energy Performance Certificate (CEE), and you need it twice: one issued before the works and a second oneafter installation. The two certificates are the official proof that the new windows delivered the required efficiency gain. Without the "before" certificate in particular, the deduction cannot be claimed retroactively — so it must be arranged before the old windows come out. If you don't have one yet, we can organise a certified technician as part of the project.

Step-by-step: from quote to refund

  1. Get a fixed quote for the window replacement so you know the eligible base amount.
  2. Obtain the "before" energy certificate (CEE) while the old windows are still in place.
  3. Complete the installation, keeping every invoice and proof of payment — bank transfers are strongly preferred over cash.
  4. Issue the "after" certificate to document the improved energy rating.
  5. Apply for any regional Next Generation grant if a call is open in your community.
  6. Declare the deduction on your next IRPF return, attaching the invoices and both certificates.

Who qualifies

These incentives are designed for private individuals improving a home. Offices and commercial premises fall under different schemes, and regions with a special tax regime (Hacienda Foral, such as the Basque Country and Navarre) apply their own deduction rules — so the exact figures there should be confirmed case by case.

Rules, percentages and grant windows change from year to year and from region to region. For the full paperwork checklist and the current 2026 conditions, read our complete guide to window renovation grants in Spain, or get in touch for a free assessment — we'll tell you which combination gives you the biggest refund and handle the documentation with you.

The figures above are indicative and do not constitute tax or legal advice. Final amounts depend on your personal situation, your region and the energy improvement actually achieved.

All prices are in euros and include VAT and delivery costs. Crossed-out prices correspond to the original product prices according to the manufacturer's recommended retail price (if available). In case of prepayment, prices and offers will be valid for 7 days from order confirmation; subsequently, they will be subject to change. Delivery zone: Spain.

Colors, glazing, and sizes may differ from images. Image realism is not guaranteed.

Some products and related images in videos may contain discontinued items and information.

1 Production times may be increased under certain circumstances (e.g., special design, company holiday periods, etc.). For technical reasons, we cannot account for these extensions when calculating production times. Due to external circumstances in the procurement of raw materials such as steel, PVC, and wood, the production time of your order may be increased. Please keep this in mind. This does not give you the right to demand changes in contractual prices or the possibility of terminating the sales contract.

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