A shared adjoining garage between two houses alters the interpretation of the home insurance contract on several points that the standard general conditions do not explicitly cover. The classification of the garage (communicating dependency, non-communicating dependency, separate co-ownership) determines the applicable guarantee regime, compensation limits, and the distribution of civil liability between neighbors.
Actual use of the adjoining garage and declaration in the insurance contract
Most claims denied on an adjoining garage stem from a discrepancy between the declared use and the actual use. A garage declared for vehicle parking but converted into a workshop, a large storage space, or equipped with an electric charging station changes the nature of the covered risk.
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We recommend checking three elements in the specific conditions of the contract before any modifications:
- The nature of the activities allowed in the dependency (parking only, occasional DIY, storage of combustible materials, electric vehicle charging)
- The classification of the garage in the contract: adjoining dependency, separate dependency, or annex in co-ownership, each involving a different compensation limit
- The obligation of electrical compliance, especially if a charging station has been installed, as non-compliant installations may lead to a fire coverage denial
An adjoining garage located at a different address from the main dwelling, or in separate co-ownership (a common case at the end of a shared cul-de-sac), remains covered as a dependency provided it is declared. Several insurers accept this coverage even without direct communication with the dwelling, as long as the distance does not exceed a threshold specified in the general conditions.
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Owners who have consulted resources like papersimmo and habitatfuturvert in Bordeaux on ImmoVite will find this point of vigilance regarding usage declaration, which conditions the entire compensation mechanism.
Civil liability and spread of damage between adjoining houses
The adjoining garage creates a direct propagation vector for fire, water, and smoke. Extended civil liability covering the garage includes damages caused to the neighboring house, even when the garage is not connected to the insured dwelling.
In the event of a fire originating in the garage (short circuit, flammable product, charging battery), the civil liability guarantee of the original garage owner compensates the neighbor. Conversely, if the adjoining wall does not comply with fire safety requirements and this non-compliance has worsened the damage, the insurer may invoke a reduction in compensation.
Adjoining wall and fire safety obligation
The separating wall between two adjoining garages must meet a fire resistance defined by the regulations applicable at the time of construction. A non-compliant adjoining wall with fire safety standards increases the risk of recourse between insurers.
We observe that several recent contracts include, in their premium formulas, a clause for bringing construction up to standard after a loss. This guarantee covers the reconstruction of the garage in compliance with current regulatory requirements (fire resistance, distance to separating boundaries, electrical compliance), beyond simple reimbursement at depreciated value.
Optional guarantees tailored to the garage of an adjoining house
The basic guarantees (fire, water damage, natural disaster) are not sufficient for an adjoining garage in urban or suburban areas. Three optional guarantees deserve serious consideration.
Water damage related to the ground and sewer backflow
Garages located at low points or in shared basements are exposed to sewer backflow and ground infiltration. Several insurers now offer separate coverage for water damage related to the ground, sewer, or water above ground, a risk that is significantly increasing in urban adjoining areas.
New value and standardized reconstruction
The new value guarantee allows for the reconstruction of an adjoining garage to current standards rather than receiving a depreciated compensation. For a garage several decades old, the difference between the deducted depreciation value and the actual cost of compliant reconstruction can represent a significant amount.
Theft and garage contents
The contents of an adjoining garage (tools, bicycle, sports equipment) are rarely covered at the same limit as the household furniture. If the garage serves as the main storage space, an extension of the furniture capital dedicated to dependencies is necessary.
Claim on adjoining garage: recourse between owners and insurers
When a claim originates in one owner’s garage and damages the neighboring house through the adjoining wall, the recourse mechanism involves both insurers. The insurer of the affected neighbor compensates their insured and then exercises subrogation against the insurer of the responsible owner.
The IRSI agreement (Compensation and Recourse for Building Claims) simplifies the handling of water damage in co-ownership, but its application to houses adjoining by garage remains limited. The sharing of responsibility depends on the maintenance of the adjoining wall and the compliance of the installations.
A documented lack of maintenance of the adjoining wall (cracks, absence of fire stop joint) prior to the claim can shift the burden of responsibility. We recommend keeping a photographic inventory of the separating wall and any modifications to the garage, submitted to the insurer at the time of subscription or contract modification.
The choice of guarantees for a house adjoining by garage is not just about ticking options in a comparison tool. The gap between a standard contract and a tailored contract reveals itself at the time of the claim, when the insurer examines the compliance of the installation, the consistency between declared use and actual use, and the quality of the separating wall.