The leading reason a Klimabonus grant is refused is not the cost of the work — it is a procedural mistake. Starting the work before receiving approval, forgetting a supporting document, using the wrong form: these are all avoidable errors. Here is the step-by-step guide to the Klimabonus 2026 procedures and forms, so you can secure your grant without any nasty surprises.
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The 4 steps of a Klimabonus 2026 application
The order is essential. Following it determines whether you obtain the grant.
Step 1 — Energy advice (if required)
For a renovation covering several elements, energy advice provided by an adviser accredited by Klima-Agence is mandatory. It results in a report of recommendations that forms the basis of the application. For a single measure (one window, one technical installation), this advice is generally not required.
Step 2 — Approval in principle (BEFORE the work)
This is the step never to overlook: you must obtain an approval in principle from the Guichet unique des aides au logement before starting the work.
Warning: starting the work before obtaining approval in principle automatically results in the application being rejected. The first request for approval in principle must be submitted between 1 January 2026 and 31 December 2030.
Step 3 — Carrying out the work
The work must be carried out by a company that is approved and registered in Luxembourg. Carefully keep the quotes, itemised invoices and proof of payment.
Step 4 — The payment request
Once the work is completed and paid for, submit the payment request. It must be submitted to the Guichet unique within 4 years from 31 December of the year of the invoice.
The Klimabonus 2026 forms
Depending on your project and your status, the grant application form is called DEPA-2026:
| Form | For whom |
|---|---|
| DEPA-2026 natural person | Individuals (owner-occupiers, landlords) |
| DEPA-2026 legal person | Companies, co-ownerships, legal entities |
You can submit your application in two ways:
- Online, via MyGuichet.lu or the MyGuichet.lu mobile app (the recommended, faster route);
- By submitting or posting the dedicated form to the Guichet unique des aides au logement.
Where can I find the official forms? The DEPA-2026 forms and up-to-date procedures are published on the government website: guichet.public.lu — Klimabonus 2026. Always check that you are using the most recent version of the form before filling it in.
📥 Free checklist to download. Our Klimabonus 2026 checklist (PDF) sums up the 4 steps, the documents to prepare and the mistakes to avoid — on a single printable page you can tick off.
The documents to provide (checklist)
Prepare these documents before submitting your payment request:
- ✅ The completed DEPA-2026 form (natural or legal person)
- ✅ A recent bank account identification document (RIB)
- ✅ The itemised, paid invoices for the work
- ✅ The proof of payment (bank statements)
- ✅ The energy advice report, where applicable
- ✅ The approval in principle obtained in step 2
- ✅ The performance documentation (U-values, efficiencies, kWp output depending on the work)
The mistakes that cost you the grant
- Starting the work without approval in principle → automatic rejection.
- Non-itemised invoice: require your tradesperson to provide an invoice broken down by item, with the performance figures.
- Late submission: the payment request must be made within 4 years of the year of invoicing.
- Non-approved company: only work carried out by a company registered in Luxembourg is eligible.
How much can you receive, work by work?
Each type of work has its own rate. Our detailed guides give you the up-to-date amounts and conditions:
- Photovoltaic solar panels — up to €10,000
- External wall insulation (ITE) — up to ~€115/m²
- Heat-recovery ventilation (MVHR) — up to €4,000
- Home EV charging station — up to €1,400
- Complete guide to the Klimabonus 2026 — all the amounts
Support, not just a form
The best way to avoid a refusal is to work with a professional who knows the Klimabonus requirements: itemised invoice, performance figures, following the correct order of steps. On tack.lu, every company is verified and registered in Luxembourg.
To receive up to 6 quotes from verified companies, request your free quotes — with no obligation and 100% free.
FAQ
Which form is used to apply for the Klimabonus 2026?
The grant application form is the DEPA-2026: “natural person” for individuals, “legal person” for companies and co-ownerships. The application is made online via MyGuichet.lu or by submitting the form to the Guichet unique des aides au logement.
Can I start the work before I have approval?
No. Starting the work before obtaining approval in principle results in the automatic rejection of the application. Approval in principle must be obtained before any work begins.
What documents are needed for the payment request?
The completed DEPA-2026 form, a recent RIB, the itemised and paid invoices, the proof of payment, the approval in principle, and the energy advice report where applicable.
How long do I have to request payment?
The payment request must be submitted to the Guichet unique within 4 years from 31 December of the calendar year of the invoice.
Where can I download the official Klimabonus forms?
The DEPA-2026 forms and up-to-date procedures are available on the official government website, guichet.public.lu, in the Klimabonus 2026 section. Always use the latest published version.
