Renovation Support Luxembourg 2026: Your Complete Guide to Klimabonus Wunnen

Renovation support Luxembourg entered a new phase in 2026. The Klimabonus Wunnen scheme — Luxembourg’s main residential energy renovation programme — has been updated with revised subsidies, new eligible works, and extended project timelines. If you own a property in Luxembourg and are planning energy improvements, understanding how the current renovation support Luxembourg offers is essential before you commit to any spending.

This guide covers what changed, what remains available, how much you can realistically recover, and the practical steps required to submit a valid application.

What Is Klimabonus Wunnen and How Does Renovation Support Luxembourg Work?

Klimabonus Wunnen is the Luxembourg government’s residential renovation subsidy programme, administered through Klima-Agence. It was originally launched in 2017 under the name PRIMe House, with the goal of helping homeowners fund energy improvements that raise a property’s energy performance class — for example, moving from class D to class B.

The scheme covers a broad range of works: insulation of walls, roofs, and floors; window and door replacement; mechanical ventilation; heat pump installation; photovoltaic (PV) panel systems; and, from 2026, green roofs and home energy management systems.

Renovation support Luxembourg operates on a reimbursement model. You pay for the works first, then submit your claim. Subsidies are not paid in advance. Applications are submitted via the Guichet unique des aides au logement on Guichet.lu, the official single access point for housing aid in Luxembourg.

What Changed in 2026: A Revised Renovation Support Luxembourg Framework

A government review finalised in late 2025 introduced several changes to align the scheme with EU state aid rules and sustainability targets. The core shift in renovation support Luxembourg is a move away from funding standalone technical installations and towards integrated renovation projects that deliver measurable improvements to a property’s overall energy performance certificate (EPC) rating.

What Has Been Removed

The following subsidies are no longer available under the updated renovation support Luxembourg framework:

Solar thermal systems in new builds. Previously eligible as a technical installation, solar thermal is no longer subsidised in new construction. The focus has shifted to retrofitting existing buildings, where the energy impact is greater.

Wood boiler installations. Biomass heating incentives have been phased out in line with tightened EU state aid rules on carbon-intensive fuels.

The standalone Tripartite bonus. This was a separate performance uplift — worth 20–60% extra — available when multiple measures were combined. It has been merged into the revised base rates, which simplifies the application but ends the bonus as a distinct line item.

Variable capacity-based technical subsidies. Heat pumps and PV systems were previously subsidised based on kilowatt output. The 2026 renovation support Luxembourg scheme replaces this with fixed lump sums, which reduces administration but caps the maximum claim for larger installations.

What Has Been Added

The 2026 update introduces new categories within renovation support Luxembourg:

Eco-insulation materials. A premium is available for low-carbon insulation products — such as wood fibre or sheep’s wool — that carry eco12 certification. This adds approximately €35–45 per m² on top of the standard wall and roof insulation rates.

Green roofs and green facades. Vegetated roofing and facade systems now attract a subsidy of €25–55 per m². These can be combined with standard insulation claims for the same surface.

Oil boiler replacement. A lump-sum subsidy of €2,500–6,000 is available for replacing an oil-fired boiler with a cleaner heating system. Priority is given to properties in aquatic protection zones.

Home Energy Management Systems (HEMS). From October 2026, a subsidy of €800–1,800 will be available for smart energy management platforms that integrate PV panels, battery storage, and household appliances. HEMS is a new category not present in the previous scheme.

Simplified fixed-sum technical aids. Controlled mechanical ventilation (CMV) and air-to-water heat pumps now carry flat-rate subsidies of €3,500–11,000, replacing the previous audit-based variable calculations.

Renovation Support Luxembourg: Rates and What You Can Recover

Reimbursement rates under renovation support Luxembourg cover 50–62.5% of eligible costs, calculated on a pre-VAT basis. Works are assessed against four performance standards (I–IV), with higher standards attracting higher rates per square metre.

The figures below show indicative base rates for key renovation elements. Your actual entitlement depends on the specific performance standard achieved, as confirmed by a Klima-Agence certified energy auditor.

Insulation — indicative base rates per m²
External walls: Standard I €18 / Standard II €24 / Standard III €30 / Standard IV €38 (+ up to €40/m² eco-material uplift)
Pitched roofs: Standard I €14 / Standard II €22 / Standard III €32 / Standard IV €40 (+ up to €30/m² eco-material uplift)
Windows and doors: €38–€53 per m² depending on performance standard achieved

Technical installations — 2026 fixed lump sums (indicative)
Air-to-water heat pump: €6,500–€13,000
Controlled mechanical ventilation: approximately €4,200
Green roof (minimum 50 m²): approximately €35/m²
Oil boiler replacement: approximately €4,000 on average

Performance bonuses apply when a project raises the EPC rating by two or more classes: +20% for a jump to class C, +40% for class B, +60% for class A or A+. These bonuses are applied to the base renovation subsidy, not to technical installation lump sums.

These figures are drawn from Klima-Agence programme documentation. Use the official Klima-Agence simulator to model your specific project before engaging contractors.

Stacking Other Support Alongside Renovation Support Luxembourg

Renovation support Luxembourg does not have to be your only source of funding. Several other mechanisms can be used alongside Klimabonus Wunnen:

Reduced VAT rate. Qualifying renovation works on a primary residence may attract a 3% VAT rate instead of the standard 17%, via the MyEnergy VAT rebate process. This is a significant saving on the total invoice and is handled separately from the Klimabonus reimbursement.

Enoprimes. These are complementary grants of approximately €400–2,500 available for specific appliance and system upgrades. Eligibility depends on the type of works undertaken.

BCEE green loans. Banque et Caisse d’Épargne de l’État (BCEE) offers subsidised green renovation loans at indicative rates of around 1.5% interest for eligible energy improvement projects. Financing the upfront cost via a green loan, then recovering the subsidy reimbursement later, is a practical approach for larger works.

Local authority grants. Some Luxembourg communes offer additional support on top of the national scheme. It is worth contacting your commune administration before finalising your project scope.

How to Apply: The Step-by-Step Process for Renovation Support Luxembourg

The application process for renovation support Luxembourg has five stages. Each step must be completed in the correct order. Starting works before obtaining pre-approval means you lose the subsidy entitlement for those works — there is no retroactive approval.

Step 1 — Energy audit. Engage a Klima-Agence certified energy expert to carry out a baseline energy performance assessment of your property. This produces your current EPC rating and identifies which works will achieve the greatest class improvement. The audit itself carries a subsidy of approximately €600–1,500.

Step 2 — Pre-approval application. Submit your project for preliminary approval via Guichet.lu before any works begin. You will need the COMP application form, contractor quotes, and technical drawings where relevant. Processing typically takes up to 60 days.

Step 3 — Certified execution. Works must be carried out by Reconnu Garant de l’Environnement (RGE) certified professionals — contractors who hold Luxembourg’s environmental qualification. Retain all invoices, certificates, and test results as these are required at the claim stage.

Step 4 — Invoice and documentation submission. Once works are complete, submit your reimbursement claim within 48 months of the invoice date. Your dossier must include invoices, photographs of completed works, and airtightness test results where applicable.

Step 5 — Layer additional support. Once your Klimabonus claim is submitted, complete your VAT rebate application through MyEnergy and confirm your Enoprimes eligibility. These are handled through separate channels but can be processed in parallel.

Approximately 30% of renovation support Luxembourg applications require resubmission due to incomplete documentation, according to Klima-Agence guidance. Front-loading the audit and pre-approval stage removes most of this risk.

Renovation Support Luxembourg and Property Value in Hesperange

For homeowners in the Hesperange commune — covering Howald, Alzingen, Itzig, Fentange, and Hesperange village — the link between renovation and property value is increasingly relevant. Energy performance has become a meaningful price factor in the Luxembourg market, and properties with EPC ratings of A or B consistently command higher prices per square metre than comparable lower-rated properties.

This gap is likely to widen as EU energy efficiency directives tighten minimum standards for existing buildings. Understanding what renovation support Luxembourg provides today, and factoring it into your acquisition strategy, is worth doing before prices for certified contractors rise further with demand.

If you are considering a property purchase and want to factor renovation potential into your budget, our property cost calculator can help you model total acquisition and improvement costs. For context on the EPC process itself, see our article on the energy performance certificate in Luxembourg. We also cover the broader cost of ownership in our guide to avoidable costs when buying property in Luxembourg, and compare older and newer stock in detail in our old vs new property in Luxembourg article.

Summary: Getting Renovation Support Luxembourg Right From the Start

Renovation support Luxembourg in 2026 is more structured than its predecessor. Rates are clearer, fixed lump sums have replaced variable calculations, and the project window has been extended. When combined with reduced VAT and complementary grants, a well-planned project can recover a substantial portion of its cost.

The three things that matter most are: begin with the energy audit, obtain pre-approval before any works start, and use RGE-certified professionals throughout. Everything else in the renovation support Luxembourg process follows from those steps.

If you are considering a property in Hesperange commune and want to understand how renovation potential affects your acquisition plan, we are glad to walk through it with you. At zeas.immo we represent buyers exclusively — our sole focus is making sure you understand exactly what you are acquiring before you commit.

Get in touch with us here to discuss your property search, or use our property cost calculator to start modelling your numbers independently.