Construction law encompasses all the rules that govern a building project, from the signing of the contract to the expiration of legal warranties. These rules establish the responsibilities of each party involved (project owner, builder, architect, subcontractor) and determine the remedies in case of defects or delays. Understanding their interplay helps avoid lengthy and costly disputes.
Construction Contract and VEFA: the Legal Foundation of the Project
Even before the first shovel hits the ground, the type of contract chosen determines the level of protection for the project owner. Two frameworks dominate the residential market: the individual house construction contract (CCMI) and the sale in future state of completion (VEFA).
The CCMI, governed by the law of December 19, 1990, imposes on the builder a guarantee of delivery at the agreed price and deadlines. A guarantor organization (bank or insurer) replaces the failing builder to complete the project. This obligation does not exist in a simple works contract signed with a contractor, which exposes the project owner to a much higher risk in the event of the company’s liquidation.
The VEFA, on the other hand, requires the developer to provide a financial guarantee of completion (GFA). The buyer pays in successive installments corresponding to the actual progress of the work. The developer cannot demand a payment exceeding the percentage provided by the Construction and Housing Code. An improper schedule constitutes a ground for contestation before the court.
To secure their real estate project, checking the contract remains the first useful reflex, well before choosing materials or negotiating the price.
Acceptance of Work: The Moment When Legal Guarantees Are Triggered
Acceptance is the act by which the project owner accepts the work, with or without reservations. It is not an administrative formality: the date of acceptance triggers all legal guarantees.
Three Guarantees to Distinguish
- The guarantee of perfect completion covers all defects reported in the year following acceptance. The contractor must repair them, regardless of their severity. A detailed acceptance report, mentioning each defect observed, is the key document in case of dispute.
- The two-year guarantee (or guarantee of proper functioning) protects for two years the equipment elements that can be separated from the building: shutters, plumbing, radiators, interior doors. If an item fails during this period, the builder must replace or repair it.
- The ten-year guarantee holds the builder responsible for ten years for damages that compromise the solidity of the work or render it unfit for its intended use. A structural crack, an infiltration making a dwelling uninhabitable, or a foundation settlement fall under this guarantee.
Accepting the work without reservations does not mean waiving the ten-year guarantee. Defects that appear after acceptance remain covered as long as they fall within its scope. However, visible defects on the day of acceptance that are not mentioned in the report become difficult to enforce.
Construction Damage Insurance: A Often Overlooked Obligation
Article L. 242-1 of the Insurance Code requires the project owner to take out construction damage insurance before the start of the work. This insurance pre-finances repairs covered by the ten-year guarantee, without waiting for a court to determine responsibilities.
In practice, a significant portion of individuals who build do not take out this insurance. The risk is twofold. First, in the event of a serious loss, the owner must advance the repair costs and initiate legal action against the builder, a process that often takes several years. Secondly, the absence of construction damage insurance complicates the resale of the property during the ten years following acceptance, as the potential buyer inherits an uncovered risk.
The ten-year insurance market in France is also experiencing tensions. The withdrawal of certain insurers weakens specific trades, particularly roofers, who struggle to find coverage at a reasonable rate. This situation can delay a project if the selected company no longer has a valid certificate at the time of signing.
Environmental Obligations in Public Construction Contracts
For consultations launched from August 22, 2026, public procurement imposes new constraints that directly affect construction projects. At least one award criterion must relate to the environmental characteristics of the offer. Price alone is no longer sufficient to differentiate candidates.
A verifiable environmental execution clause becomes mandatory in all public works contracts. It may concern the management of construction waste, the traceability of materials, or the limitation of noise disturbances. For contracts exceeding the European thresholds for formal procedures, a social clause (professional integration, employment of people with disabilities) must also be included in the contract, unless a motivated exemption is provided.
These requirements do not apply retroactively to contracts already published. However, they modify the access conditions to markets for construction companies, which must adapt their offers and their site organization.
What This Changes for a Private Project Owner
An individual is not directly subject to these obligations. However, there is an indirect effect: companies that respond to public contracts pass on the costs of compliance to all their estimates, including in the private sector. Anticipating this increase in the budget forecast avoids unpleasant surprises during the project.
Construction law is not just a catalog of theoretical guarantees. Each step, from choosing the contract to acceptance, produces concrete legal effects that protect the project owner or, in case of negligence, expose them. Checking the ten-year certificate of a craftsman before signing an estimate takes two minutes. Repairing an uncovered defect can take years.
