Construction guarantees in Luxembourg
In Luxembourg, construction guarantees protect building owners against defects and damage affecting works. Governed by the Civil Code and construction law, they cover three distinct periods: work completion, detachable equipment, and building structure. These legal guarantees are matters of public policy and cannot be reduced by agreement between parties. They represent essential protection for every owner undertaking significant construction or renovation work.
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Get a quote →Overview of the three guarantees
The Luxembourg construction guarantee system is based on three pillars protecting the building owner at different stages after delivery of works. Each of these guarantees covers a specific aspect of construction and extends over a legally determined period.
| Guarantee type | Duration | Start date | Coverage |
|---|---|---|---|
| Perfect completion | 1 year | Work reception | All apparent defects and poor workmanship |
| Biennial guarantee | 2 years | Work reception | Detachable equipment and finishing elements |
| Decennial guarantee | 10 years | Work reception | Essential structures and building structure |
These three guarantees function in a cascade: they succeed each other over time but partially overlap. The decennial guarantee remains even after the expiration of the other two, covering serious defects affecting the building structure.
Perfect completion guarantee (1 year)
Definition and scope
The perfect completion guarantee extends for a period of 1 year from the reception of works. It requires all companies involved in construction to repair all defects and poor workmanship that can be observed after the keys are handed over, no matter how minor. This guarantee covers all types of apparent defects: peeling paint, broken tiles, faulty installations, etc.
Company obligations
During this one-year period, each company remains responsible for completing the works in accordance with contract specifications. They must correct free of charge any defect reported by the owner, without being able to invoke obsolescence or normal wear and tear.
It is recommended to draw up a detailed report when work is received to document the initial condition of the building. This practice greatly facilitates recourse to contractors in case of problems detected.
Important documents
- Reception report: Document establishing the condition of the property at delivery
- Warranty notice: Provided by contractors, explaining the terms
- Photos and certificates: To document reported defects
Biennial guarantee (2 years)
What is the biennial guarantee?
The biennial guarantee, also called the good operating guarantee, extends for 2 years from the reception of works. It covers defects affecting detachable equipment and finishing elements: doors, windows, plumbing fixtures, heating, electricity, floor and wall coverings, etc.
Covered elements
- Plumbing and sanitary installations
- Heating and air conditioning systems
- Electrical installations
- Carpentry and ironwork
- Tiling and floor coverings
- Paints and wall coverings
- Integrated appliances
The biennial guarantee only applies to defects that appear during the 2-year period. Equipment that fails a week after the 2-year period expires is no longer covered. It is therefore crucial to detect and report problems at the right time.
Proof of defect
The owner must provide evidence that the defect already existed at reception or that it results from a construction/installation defect. This evidence can be provided by expert assessment, testimony, or documentation.
Decennial guarantee (10 years)
The decennial guarantee under Article 1792 of the Civil Code
The decennial guarantee is the most important construction guarantee in Luxembourg. It extends for 10 years from the reception of works and covers serious defects affecting the solidity of the structure or rendering it unfit for its purpose. Based on Article 1792 of the Luxembourg Civil Code, it is a matter of public policy and cannot be contractually reduced.
What is an essential structure?
- Building structure (foundations, frame, skeleton)
- Waterproofing elements (roof, windows, external doors)
- Inseparable building elements (integrated stairs, frame elements)
- Essential installations (electricity, plumbing, heating) if integrated
Application criteria
For a decennial guarantee to apply, the defect must:
- Appear within 10 years following official reception of works
- Affect the solidity of the structure or render it unfit for its purpose
- Result from a hidden vice in the design or construction
- Be identifiable as a defect, not normal wear and tear
The decennial guarantee operates independently of other guarantees. Even if the biennial guarantee has expired, the decennial continues to protect against serious structural defects. This is why it is considered the most protective guarantee for the owner.
Decennial insurance
Although subscription to decennial insurance is not legally mandatory in Luxembourg (unlike France), it is highly recommended. It covers serious damage that an individual contractor could not afford financially.
Provisional and final work reception
The importance of reception
Work reception is a fundamental moment in construction law. It is from this official date that the deadlines for the three guarantees begin to run. Well-documented reception is therefore crucial to protecting your rights.
Provisional reception
- A detailed report must be drawn up
- The owner can accept with or without reservations
- Reservations concern minor defects to be corrected
- The contractor has a deadline to correct reservations (usually 2-4 weeks)
Final reception
- The transfer of ownership is completed
- The legal guarantees officially begin to run
- The contractor is released from obligations (except guarantees)
- The retention guarantee is progressively returned
Attend the reception personally, even briefly. Inspect carefully and note any apparent defect. Do not sign the report without raising your concerns. Request a certified copy of all reception documents.
Mandatory and recommended insurance
Status in Luxembourg
Unlike France where decennial and biennial insurance are mandatory, in Luxembourg, subscription of decennial/biennial insurance by a contractor or developer is voluntary. However, although not legally mandatory, it is highly recommended in practice.
Decennial insurance
- Coverage: 10 years from work reception
- Covered claims: Serious defects affecting solidity and purpose
- Guaranteed by: An approved insurance company
Damage-to-works insurance (DO)
- Advantage: Quick compensation without dispute
- Cost: Usually 2-4% of total construction cost
- Recommendation: Highly recommended for new construction
Decennial insurance protects the owner against contractor insolvency. Damage-to-works insurance protects the building itself. These two insurances are complementary, not substitutive.
General liability insurance
Any contractor must have general liability insurance covering damage caused to third parties during work. This is a legal obligation, unlike decennial/biennial insurance.
Retention guarantee (5%)
What is a retention guarantee?
A retention guarantee is a portion of the agreed price that is not paid to the contractor at contract signature, but is retained by the owner for a specified period. It serves as a guarantee for correcting defects identified during the perfect completion period.
The standard rate
The standard retention guarantee rate in Luxembourg is 5% of the net price. Example: for a project of 100,000 euros net, the retention guarantee is 5,000 euros.
Retention period
- 1 year: Standard period corresponding to the perfect completion guarantee
- Possibility of early return: After correction of all reception defects
Do not confuse contractual retention and judicial retention. Retention guarantee is a standard contractual clause (maximum 5%), while judicial retention is a legal action in case of dispute.
Interest on retention guarantee
The contractor is entitled to statutory interest (currently approximately 2% per year in Luxembourg) on the retained sum to compensate for the loss of use of that money.
Completion guarantee — VEFA
What is VEFA?
VEFA stands for « Sale in Future State of Completion ». It is a real estate sales method where the buyer pays progressively during construction and receives the keys once work is completed. In Luxembourg, VEFA contracts must necessarily include a completion guarantee or reimbursement guarantee.
Financial completion guarantee (GFA)
- Building completion: If the developer does not complete the work, the guarantee finances completion
- Reimbursement: If completion is impossible, funds paid are reimbursed
- Legal obligations: The GFA must be obtained before work begins
The two guarantee systems are complementary and not redundant. The GFA protects during construction, legal guarantees protect after delivery.
Cost
The cost of the GFA is usually borne by the developer or included in the sale price. It typically represents 0.5 to 2% of the total price of the property.
Recourse in case of defects
Priority steps
- Written notice: Contact the contractor or developer by registered mail with precise description of defects
- Formal notice: Set a reasonable deadline (usually 10-15 days) to correct defects
- Expert assessment: If the contractor denies defects, have a technical expert assessment conducted
- Legal recourse: As a last resort, file suit in court
Time limits for recourse
| Guarantee type | Maximum time to act | Starting point |
|---|---|---|
| Perfect completion | 1 year | Work reception |
| Biennial guarantee | 2 years | Work reception |
| Decennial guarantee | 10 years | Work reception |
Failure to report a defect before the deadline expires may mean loss of the right to demand its correction. It is advisable to document all apparent defects at reception.
Frequently asked questions about construction guarantees
What happens if a defect appears 11 years after reception?
Unfortunately, after 10 years, the decennial guarantee has expired and you have no further legal recourse against the contractor. Only damage-to-works insurance taken out before delivery could cover this loss. This is why respecting notification deadlines is crucial.
Can I refuse reception if I notice defects?
Yes, you can refuse provisional reception or request reception with reservations. These reservations are documented in a report and the contractor has a deadline to correct them. Do not sign without expressing your concerns.
Is the perfect completion guarantee automatic?
Yes, the 1-year perfect completion guarantee is legal and applies automatically. It does not require additional insurance. However, you must report defects within one year.
Who bears the cost of repairing defects covered?
It is the contractor who must bear the cost of repairing defects covered by guarantees. You, as the owner, are not responsible for costs related to defects that are the contractor’s contractual responsibility.
How does the retention guarantee work if you resell?
If you sell before the retention guarantee is returned to you, this retention is usually transferred to the buyer or notary as guarantee for the works. The terms depend on the sale contract and agreements between parties.