What will new windows really cost you? Two schemes can stack on the same window project: a regional grant of up to 40% (capped at €7,500 per dwelling) and the IRPF tax deduction of up to 40% (max €3,000). Set your budget, province and property type to see the honest final figure — and remember the deduction for dwellings ends 31 December 2026.
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Get the embed codeThe calculator above uses Spain’s national grant — the same everywhere. This is the detail it can’t show: which specific calls are open or closed where you live, the regional top-ups, and the País Vasco / Navarra tax deductions. Pick your province.
| Program | Level | You get | Status |
|---|---|---|---|
| Deducción IRPF por eficiencia energética — tramo 40% Main home or a rented dwelling. Needs a certified ≥30% cut in non-renewable primary energy (or class A/B). Any grant is netted out of the base. | State tax | 40% · €3,000 /yr | Open · until 31 Dec 2026 |
| Deducción IRPF por eficiencia energética — tramo 20% Lighter tier for a certified ≥7% cut in heating + cooling demand. Base up to €5,000/yr. | State tax | 20% · €1,000 /yr | Open · until 31 Dec 2026 |
| Plan Estatal de Vivienda 2026–2030 (RD 326/2026) Successor state grant for envelope works incl. windows — 40–80% by energy saving (up to ~€20,500). Rolls out through each región’s own call; not yet open everywhere. | National | 40% · €7,500 /dwelling | Coming |
| Plan Renove de Ventanas (FENERCOM) Window-specific regional grant, priced per m². Budget exhausted Aug 2025; no 2026 call yet. | Regional | ~120–180 €/m² · cap €3,000 | Closed |
| PRTR — Programa 3/4 (Comunidad) The national grant delegated to the region. Main home; ≥7% demand or ≥30% primary-energy cut. Application window closed. | Regional | 40% · €3,000 /dwelling | Closed |
| Plan Rehabilita Madrid 2026 (Ayuntamiento) MUNICIPAL — Madrid city only, not the whole región. Open 3 Jun – 30 Sep 2026. | Municipal | 40–90% incl. windows | Open · until 30 Sept 2026 |
Illustrative summary compiled July 2026 from official sources — calls change fast; verify current status with your comunidad before applying. Figures marked “unconfirmed” need re-checking.
Spain runs two separate refunds for energy-efficient window replacement. They can apply to the same project, but each has its own rules — and the grant is netted out of the deduction, so the real saving is smaller than adding the two percentages.
The Plan Estatal de Vivienda 2026–2030 funds envelope works — window replacement included — with up to 40% of the cost, capped at €7,500 per dwelling. It's paid through your region's call, so availability depends on your comunidad autónoma and the energy saving achieved.
Deduct 40% of what you actually paid, on a base of up to €7,500 a year — max €3,000 back. It applies to your main home or a rented dwelling, and requires a certified 30% cut in non-renewable primary energy or reaching class A/B. Works and payments must land by 31 December 2026.
You've seen what the grants leave you to pay. Design your exact windows in the calculator and let verified installers compete for your project.
Yes. The Plan Estatal de Vivienda 2026–2030 (RD 326/2026) funds envelope works such as window replacement with a direct grant of up to 40% of the cost, capped at €7,500 per dwelling. It is distributed through regional calls, so the exact amount and timing depend on your comunidad autónoma and the energy saving the works achieve.
Yes — the two schemes stack on the same window project, but never on the same euro: any public grant you receive is subtracted from the base of your IRPF deduction. The calculator applies that netting rule automatically, which is why its final figure is lower than simply adding the two headline percentages.
Window projects typically aim for the 40% tier: 40% of what you actually paid (after any grant), on a base of up to €7,500 per year — up to €3,000 back. It requires a certified cut of at least 30% in non-renewable primary energy, or reaching energy class A or B. A smaller 20% tier exists for a certified 7% cut in heating and cooling demand.
For individual dwellings, the works must be done and paid for by 31 December 2026, and the post-works energy certificate issued before 1 January 2027. Only the 60% whole-building tier (works approved by a community of owners) runs a year longer, to the end of 2027.
Yes — both the grant and the deduction require a registered energy certificate before and after the works, to prove the saving. If you don't already have one, budget about €150 for the certificates. Payments must also be traceable (card, transfer or cheque) — cash does not qualify.
The state IRPF deduction applies to your main home or a dwelling you rent out — not second homes or business premises. País Vasco and Navarra run their own foral tax regimes with separate deductions, so the state scheme doesn’t apply there. The calculator flags both cases when you set your property type and province.