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Engineering & sustainability consultancy · LuxembourgOne section,
one module,
one method.

Alpex prepares energy subsidy applications, issues energy performance certificates and produces carbon footprints for SMEs in Luxembourg. You sign, we build the application, follow the assessment and defend the amount through to payment.

Working days to file after a complete survey
10
Disciplines: subsidies, EPC, carbon
3
National and municipal rate schedules
LU
Who we work for
  • Owners and co-ownerships undertaking renovation
  • Developers and clients
  • SMEs and retailers
  • Architects and installers
  • Municipalities and associations
Services

Three disciplines, one standard of rigour

Every service exists to move an application forward. No decorative deliverables: a site survey, a calculation, a document the authorities will accept.

Concrete apartment building under construction, wrapped in scaffolding
ALPX-SUB

Energy subsidy applications

The public funding available, actually recovered, from energy advice through to payment.

  • Energy advice before the works
  • State, municipal and supplier subsidies identified and costed
  • Filing, follow-up of the assessment and defence of the amount
Deliverable
Complete application filed
Timescale
10 working days after the site survey
Estimate my subsidy : Energy subsidy applications
ALPX-CPE

Energy performance certificate

The energy performance certificate for dwellings and functional buildings, based on a site survey.

  • New build, renovation, sale and letting
  • Offices, retail premises and workshops
  • Costed renovation recommendations
Deliverable
EPC + recommendations
Basis
Site survey
Request a study : Energy performance certificate
ALPX-CO2

SME carbon footprint

An emissions inventory you can use, funded up to 70 % through the SME Packages Sustainability.

  • Scopes 1, 2 and 3, with a defined boundary
  • Documented and sourced emission factors
  • Costed, prioritised reduction plan
Deliverable
Report + calculation spreadsheet
Follow-up
Annual update
Request a study : SME carbon footprint
ALPX-ETU

Studies and technical assistance

The studies that settle a renovation scenario and keep the application on track during the works.

  • Feasibility and comparison of scenarios
  • Thermal bridges and condensation risk
  • Review of tenders and end-of-works checks
Deliverable
Costed technical note
Format
One-off assignment or ongoing support
Request a study : Studies and technical assistance
Calculator

How much your project can recover

Four questions, a range calculated on the Klimabonus 2026 rate schedule. It is an order of magnitude, not a commitment: the amount that applies depends on the performance levels reached and is confirmed on documents before the works are committed.

Step 1 of 5Klimabonus 2026

What kind of building is it?

The subsidy scheme and the caps differ according to the type of property.

Method

From the first call to payment

A proven way of running an application: every stage produces a document, and every document has a date.

  1. Scoping

    Thirty minutes on the telephone to check eligibility, the regulatory deadlines and the order of operations. You know whether an application makes sense before paying anything.

  2. Site survey

    Visit to the property: geometry, construction layers, technical plant, referenced photographs. The survey governs everything that follows, and is never done remotely.

  3. Calculation and estimate

    Application of the rate schedules in force and estimate of the amount recoverable. You receive a figure, its basis of calculation and the conditions under which it holds.

  4. Filing

    Assembly of the application, checking of the supporting documents, filing with the authorities. Complete documents first time round: that is what shortens the assessment.

  5. Assessment

    Active follow-up: responses to requests for further information, correction of discrepancies, defence of the amount. You are informed each time the status of the application changes.

  6. Payment

    Checking the amount paid against the amount assessed. Where there is a discrepancy, we take the matter up with the authorities.

Subsidies

The schemes we handle

Luxembourg subsidy schemes change: amounts, caps and conditions are checked at the time of filing, never from a brochure.

VENTILATED ROOFINSULATIONλ 0.03512.40 mTYPICAL SECTION / RETROFITSCALE 1:50ALPX / LU
What triggers the subsidyALPX / LU / 2026
  • KlimabonusEnergy retrofit and renewable heating for dwellingsPrior energy advice required for retrofit works
  • Sustainable constructionNew housing with high energy performanceConditions linked to the class reached
  • Municipal subsidiesLocal top-ups, combinable depending on the municipalityRate schedules specific to each municipal authority
  • SME Packages SustainabilitySustainability support and carbon footprints for SMEsUp to 70 % of the investment, capped at €25,000
  • Business subsidiesEnergy efficiency, decarbonisation and audits in SMEsAssessed separately from the residential scheme
This list is indicative. The amount applicable to your project is calculated on the rate schedule in force on the filing date and confirmed in writing before any commitment.
The practice

An engineering consultancy that reassures through restraint

Alpex S.à r.l. is an engineering and sustainability consultancy based in Luxembourg. Our work is to turn a renovation project into an application the authorities will accept, then to defend it through to payment of the subsidy.

We do not trade in ecological imagery. What speaks of sustainability here is the precision of the line, the section, the layer that changes everything: an accurate figure, a rate schedule properly handled, a supporting document complete first time round.

Photovoltaic panels on a building roof at sunset
of an SME's sustainability investment funded through the SME Packages
70 %
maximum amount an SME can recover under this scheme
€17,450
energy advice subsidy for a single-family house
€1,700
Klimabonus cap on the total cost of the works
50 %

Public amounts in force at the date this page was last checked. They do not prejudge the amount applicable to a given project.

Precise

Figures, rate schedules, deadlines. Never an approximation where an amount is at stake.

Restrained

An engineering consultancy reassures through restraint, not through effect. Few colours, plenty of white.

Solid

Stable methods, reproducible deliverables. Nothing fragile, nothing fashionable.

Useful

Every document exists to move an application forward. Nothing decorative.

Questions

What we are asked most often

When does the energy advice have to be carried out?

Before the works are committed, without exception. The Klimabonus makes the energy retrofit subsidy conditional on energy advice carried out beforehand: starting the works first means losing the subsidy.

The advice is itself subsidised, at €1,700 for a single-family house and €2,000 for a two-dwelling building, increased by €60 per additional dwelling up to a limit of €3,000.

How long does an application take?

We file within ten working days of a complete site survey. The assessment period is then a matter for the authorities and varies with the scheme and the time of year.

What we control is the quality of the filing. An application that is complete first time round avoids the back and forth, which is the main cause of delay.

What happens if the authorities ask for a document?

We deal with it, it is part of the assignment. You have nothing to draft. We produce the document requested, correct the discrepancy if there is one, and inform you each time the status of the application changes.

If the amount paid differs from the amount assessed, we take the matter up with the authorities.

Is an energy performance certificate compulsory in order to sell or let?

Yes. In Luxembourg, the energy performance certificate must be drawn up and given to the prospective buyer or tenant when a dwelling is sold or let, and the energy classes must appear in the advertisement.

It is also required for new build and on completion of major energy retrofit works.

Do you work with businesses?

Yes, on three fronts: energy performance certificates for functional buildings, subsidies for energy efficiency and decarbonisation, and the carbon footprint.

For Luxembourg SMEs, the carbon footprint falls within the scope of the SME Packages Sustainability, which fund up to 70 % of the investment, capped at €25,000.

How are you paid?

A fixed fee, quoted after the telephone scoping call. The thirty-minute scoping call is free and without obligation: its purpose is precisely to tell you whether an application stands up before you commit to anything.

The fixed fee is known in advance and does not depend on the outcome of the assessment.

Which languages do you work in?

Correspondence and deliverables are in French or English. Filings with the Luxembourg authorities are drawn up in the administrative language expected by the department carrying out the assessment.

Contact

Describe the building and we will tell you whether an application stands up

A first conversation of thirty minutes is enough to establish whether a subsidy can be obtained and in which order to proceed. It is free and without obligation.

Area covered
Grand Duchy of Luxembourg
Response time
One working day