Renovating an old apartment in Luxembourg: challenges, solutions and a realistic budget

Renovating an old apartment in Luxembourg is a unique challenge. Between specific technical constraints, strict regulations and the high costs of the Luxembourg market, this type of interior renovation requires careful preparation. This complete guide helps you anticipate challenges, understand the available solutions and estimate a realistic budget to transform your old home into a modern, comfortable space.

The specific challenges of older apartments in Luxembourg

Older Luxembourg apartments have particularities you won't encounter in a standard renovation. The Grand Duchy's older housing stock, often built between the 1950s and 1980s, accumulates several technical issues:

• Poor thermal insulation: single uninsulated walls, single-glazed windows and significant thermal bridges directly affecting your comfort and your energy budget
• Structural constraints: load-bearing walls impossible to modify without expensive studies, limiting your design options
• Presence of asbestos: a toxic material in many constructions until the 1990s, requiring a mandatory survey and certified removal (€50 to €150/m²)
• Obsolete installations: electrics and plumbing no longer meeting current safety standards

Technical constraints: what to expect in concrete terms

Obsolete electrics and plumbing

Electrical installations in old apartments no longer meet current standards. Old switchboards, lack of earthing, fabric-insulated wiring: bringing the system up to standard becomes essential for your safety. Count between €80 and €120 per m² for a complete electrical renovation.

Old plumbing, often in lead or galvanised steel, requires complete replacement. Beyond health concerns, this pipework regularly causes leaks and insufficient water pressure. Replacing all the plumbing represents between €60 and €100 per m².

Insulation and ventilation

Insulating an old apartment in Luxembourg is a priority investment. Wall insulation from the inside often remains the only option in co-ownership, which slightly reduces your living area. Plan €60 to €100 per m² for high-performance insulation with modern materials.

Mechanical ventilation becomes indispensable after insulation to avoid humidity and mould. Installing a heat-recovery ventilation system costs between €4,000 and €7,000 for an 80 m² apartment, but it significantly reduces your energy bills.

Luxembourg standards and regulations to comply with

Building permits

Renovating an old apartment in Luxembourg involves complying with several specific regulations. Even in co-ownership, certain works require a building permit from your municipality:

• Modification of load-bearing walls
• Change of use of a room
• Creation of openings in the facade
• Modification of the roof

Consult your municipality's planning department before starting. Processing times range from 2 to 4 months depending on the municipality.

Energy standards

Current energy standards impose minimum performance levels to qualify for financial aid. The energy performance certificate must show an improvement of at least two classes to claim the Klimabonus. This requirement necessarily steers your technical choices toward high-performance solutions.

Co-ownership rules

In co-ownership, you must obtain the agreement of the general assembly for work affecting the common areas or the external appearance of the building. Anticipate these steps several months before the start of the work to avoid delays.

Realistic budget for renovating an old apartment

The price of renovating an old apartment in Luxembourg generally falls in a higher range than standard renovations, due to the additional technical constraints.

Price ranges 2025

A concrete example

For an 80 m² apartment requiring a complete home renovation with asbestos removal and electrical bring-up-to-code, plan an overall budget between €120,000 and €160,000. This amount may seem high, but it guarantees a healthy, comfortable home with strong value on the Luxembourg property market.

Available financial aid in Luxembourg

Luxembourg offers several schemes to ease the cost of your interior renovation:

Reduced VAT at 3 %

• Advantage: immediate saving of 14 % on the cost of the work
• Cap: €50,000 per dwelling
• Condition: main residence only
• Saving: around €14,000 saved on a €100,000 project

Klimabonus: energy grants

The Klimabonus specifically funds energy renovation work:

• Wall insulation: €60 to €120 per m²
• Certified sustainable materials: up to €180 per m²
• Window replacement: substantial grants
• High-efficiency heating installation: aid available

Guaranteed climate loans

Climate loans, guaranteed by the Luxembourg state, allow you to finance up to €50,000 of energy work over 15 years at preferential rates. This scheme makes it easier to finance major investments such as full insulation or a heating system overhaul.

Additional municipal aid

Some Luxembourg municipalities also offer additional aid for renovating older homes. Check with your municipal administration to find out about the local schemes available.

Key steps for a successful renovation

A successful renovation of an old apartment requires a rigorous methodology. Follow these essential steps to optimise your project.

1. Complete technical assessment (4–6 weeks)

Start with the mandatory asbestos survey, complemented by an electrical and plumbing inspection. An energy audit will identify priority items for improving thermal performance. These assessments cost between €800 and €1,500 but avoid unpleasant surprises during the build.

2. Project definition and budgeting (2–4 weeks)

Prioritise your work according to three criteria: safety, regulatory compliance and comfort. Work on asbestos, electrics and plumbing takes precedence over aesthetic aspects. Set an overall budget with a 15 % safety margin for the unexpected.

3. Consulting renovation companies (4–6 weeks)

Request at least three detailed quotes from Luxembourg renovation companies specialised in renovating old apartments. Verify their references, their professional insurance, and their experience with the specific technical constraints of older homes.

4. Administrative procedures (8–12 weeks)

If necessary, file your application for a building permit. In parallel, prepare your file for the 3 % VAT rate and the Klimabonus. These administrative steps take time but generate substantial savings.

5. Carrying out the work (12–24 weeks)

The site starts with the heavy works: asbestos removal, structure, structural work. Then come the technical installations (electrics, plumbing, heating, MVHR), then insulation, and finally the finishes. An 80 m² apartment in complete renovation generally requires 4 to 6 months of work.

Choosing the right companies in Luxembourg

The choice of your partners conditions the success of your renovation project. Favour companies with solid experience of old apartments.

Essential selection criteria

• ✓ Registration in the Luxembourg trade register verified
• ✓ Valid professional insurance (civil liability and ten-year cover)
• ✓ Specific experience of the technical constraints of older homes
• ✓ Verifiable references for similar projects
• ✓ Detailed quotes mentioning each item of work, materials, deadlines and payment
• ✓ Mastery of Luxembourg financial aid (3 % VAT, Klimabonus)

Indispensable checks

Question your providers about their approach to asbestos removal, their command of work on load-bearing walls, and their knowledge of Luxembourg financial aid. For specific work such as a bathroom renovation or interior painting, verify their expertise in these areas.

Consult references and, if possible, visit recent sites similar to yours. Customer reviews and word of mouth remain reliable indicators of a company's quality.

FAQ: your questions on renovating old apartments

How much does a complete renovation of an old apartment in Luxembourg actually cost?

For an 80 m² old apartment, count between €112,000 and €160,000 depending on the scale of the work. This budget includes electrical and plumbing bring-up-to-code, complete insulation, replacement of joinery and the renovation of the kitchen and bathroom. Add €40,000 to €60,000 if asbestos removal proves necessary.

What financial aid is available for renovating an old apartment in Luxembourg?

You can combine the reduced 3 % VAT (saving of 14 % up to €50,000 of work), the Klimabonus for energy work (€60 to €180 per m² depending on materials), and possibly a state-guaranteed climate loan. These grants can cover 20 to 30 % of the total cost of your renovation.

Is asbestos removal mandatory for all old apartments?

Asbestos removal becomes mandatory only if the asbestos survey reveals the presence of asbestos materials in poor condition or if your work involves handling them. All apartments built before 1990 must undergo an asbestos survey before renovation. The cost ranges between €50 and €150 per m² depending on the complexity of the intervention.

Can I renovate my apartment in co-ownership without authorisation?

Interior work that does not affect either common areas or the external appearance generally does not require co-ownership authorisation. On the other hand, facade modifications, replacement of exterior joinery or work on load-bearing walls require the agreement of the general assembly. Some work may also require a municipal building permit.

How long does a complete renovation take?

For a complete renovation of an 80 m² old apartment, allow 4 to 6 months of effective work. Add 2 to 4 months for administrative procedures (permits, authorisations). If asbestos removal is required, count 2 to 4 additional weeks at the start of the build. Timing also depends on the availability of craftsmen, particularly tight on the Luxembourg market.

Conclusion: turn your old apartment into an asset

Renovating an old apartment in Luxembourg is a substantial but profitable investment. Between the increase in property value, energy savings and improvement in daily comfort, the benefits far outweigh the initial constraints.

The key to success lies in careful preparation: complete assessments, a realistic budget including a safety margin, careful choice of your partners and optimisation of available financial aid. The Luxembourg context, with schemes like the 3 % VAT and the Klimabonus, offers attractive financial levers to transform your old home into a modern, high-performing space.

Ready to start your project? Contact us for a personalised quote and benefit from the expertise of professionals specialised in renovating old apartments in Luxembourg. Our team supports you from A to Z to maximise your grants and optimise your budget.