Do you sell an old house, apartment or property of character in Soissons? If the indoor gas installation of the dwelling is more than 15 years old, a condition of the internal gas installation must in principle be communicated to the purchaser.
This file helps you understand the seller's obligations, select a qualified diagnostician, prepare his visit and distinguish ordinary anomalies from a serious and immediate danger.
The old interior installation of gas triggering, in principle, the sale diagnosis.
Maximum age of report: it must be less than three years at the legally required time.
Where a house or apartment has a inland gas installation over 15 years of age, the seller owner must in principle have the corresponding state established. The criterion to be considered is the seniority of the installation, not only the date of construction of the house or its membership in a historical district.
In Soissons, as elsewhere in France, this rule applies to both individual houses and condominium apartments. However, the actual operation of the facility, its history and any evidence of modification or compliance should be reviewed.
A boiler, water heater or fixed gas-connected appliance warrants an examination of the age of the installation and, where appropriate, the control of the diagnosis.
The sales control covers the private indoor installation of the lot, not all the collective networks of the building.
The date of intervention and the nature of the work must be documented. Partial renovation does not mean that the entire network is recent.
The obligation shall not be presumed if the housing does not have an internal gas installation concerned. The notary checks the documentary situation.
An certificate of conformity may, in certain cases provided for in the regulations, replace the sales diagnosis. It must relate to a modified or completed facility, be less than three years old on the required date and come from an approved organization quoted by Public Service: Qualigaz, Dekra or Copraudit. It is therefore not enough to submit a simple boiler maintenance invoice.
The report is integrated into the Technical Diagnostic Record (TDD)given to the future purchaser at the time of the promise of sale or, in the absence of a promise, at the time of the authentic act. For a sale, it must have been established for less than three years at the applicable date. The duration of the lease is different: less than six years at the time of signing the lease.
The proximity of a firm is useful, but it does not replace the qualification check. The diagnosis must be made by a person with valid gas certification, adequate professional insurance and guarantees of independence.
Find the name of the person involved in the official directory of diagnostics and check the domain specifically « gas » and the validity of the certificate.
Indicate the address, surface, presence of a boiler, water heater, gas-fired kitchen and appendices to visit.
Ask for the TTC rate, the scope of the control, the time limits for visiting and returning the report, and any special conditions.
Make sure the mission is an objective regulatory expertise. Any corrective work is then performed by a separate qualified professional.
We have established a local directory of professionals located in the city. It facilitates a first contact, without ensuring that each identified person holds all the certifications.
See the directory in SoissonsCheck certification « gas » the intervener's date of validity and insurance.
Official Directory of Certified DiagnosticsA maintenance technician, heating operator or gas installer cannot automatically establish the regulatory sales status. It must meet the specific certification and independence requirements of the diagnostic profession.
The diagnosis aims to assess certain safety risks related to the interior installation. It does not constitute a general guarantee against future failure or a certification of conformity of all components of the building.
Examination of pipes and fittings for internal feeding within the limits and control points provided for in the regulatory method.
Verification of heating, hot water and other stationary gas-fired equipment within the perimeter of the state.
Observation of the arrangements for aeration of the space in which the gas appliances operate.
Monitoring of relevant elements and expected operating conditions to reduce the risk of improper evacuation.
Control is carried out without disassembly of the components of the installation. As a result, the diagnosticist can report equipment that is not accessible, tests that are not performed or limitations encountered. These reservations should not be confused with exhaustive verification of all hidden pipes.
A few practical checks provide the professional with the necessary information and access to facilities. The owner does not have to carry out risky technical operations himself.
Identify boiler, water heater, stationary gas-connected appliances, technical space and potentially affected dependencies.
Facilitate access to visible equipment and components without moving or dismounting connections.
Prepare previous diagnoses, possible certificates of compliance and recent intervention invoices.
Indicate any out-of-service equipment, power outage, difficulty of access or repair in progress, without minimizing the facts.
Do not carry out a leak test, disassembly, return to service or dangerous handling to prepare the diagnosis yourself. In case of suspicion of gas leakage, apply the safety instructions of your distributor and call the competent services.
A vacant dwelling does not automatically exempt the seller. If an installation is concerned, it is necessary to anticipate the difficulties associated with a power supply or non-functional devices, which may limit certain checks.
The gas state does not only indicate if an installation is old: it identifies the anomalies identified with respect to the regulatory method and ranks them according to their severity. The terminology must be understood precisely.
Anomaly to be taken into account in a subsequent installation intervention.
More serious anomaly, to be repaired as soon as possible, without justifying an immediate interruption alone.
Serious and immediate danger: interruption of the gas supply by the operator until the danger is removed.
A special case, called abnormality 32 c, concerns certain boiler installations with mechanical gas-controlled ventilation (GCV) and collective safety: it justifies a specific treatment involving in particular the trustee or lessor concerned and the distributor.
The gas must never be returned to service on the condemned party until the anomaly has been corrected in accordance with professional instructions and safety rules. Organize the intervention of a competent company before any return to service.
A report with anomalies does not automatically render sale legally impossible. On the other hand, it involves concrete questions of security, information of the purchaser and, as the case may be, of work and timetable. A serious danger cannot be trivialised on the grounds that a compromise must be signed.
For non-emergency anomalies, the seller and the purchaser may discuss pre-sale intervention, quotation or consideration of the work in their agreement. Commitments must be clearly drafted with the notary. A diagnosis is not a discount bill and does not allow the cost of work to be deducted by itself.
No. The boiler's maintenance is carried out on an apparatus and certain checks of use. The gas state examines regulatory points related to the indoor installation and must be established by a certified diagnostician when the obligation to sell applies.
The answer depends on the nature of the danger, the security obligations, the sales agreement and the interventions envisaged. It would be inaccurate to say that all anomalies systematically result in the seller having to replace the installation. On the other hand, the measures necessary to remedy a serious danger must be dealt with without delay and cannot be deferred as a mere commercial issue.
In a condominium building, the diagnosis given to the purchaser of an apartment shall, where it is mandatory, include: the interior installation of the private lot and its dependencies. It does not replace the maintenance, management or security documents of the building's public equipment.
The seller must examine the age of the private installation and the equipment concerned in its lot.
Collective facilities are subject to specific rules and responsibilities. A private gas state does not make it possible to conclude to the safety of the entire boiler room.
If the diagnoser finds a situation under a specific collective arrangement, particularly in certain buildings equipped with gas CMV, the observations should be read carefully and the procedures indicated followed.
For an apartment in Soissons, other documents complete the file according to the property: asbestos, lead, Electricity and measurement law Carrez. The trustee remains the appropriate contact for information on the equipment and decisions of the condominium.
Not necessarily. The seniority of the internal gas installation must be assessed, not just the date of purchase or replacement of an appliance.
No. For a sale, the report must be less than three years old on the required date. For a rental, the diagnosis must be less than six years old upon signing the lease.
The presence of an anomaly does not automatically block the transaction, but risks and obligations must be treated seriously. An A2 anomaly calls for repair as soon as possible.
DGI means « serious and immediate danger ». This situation requires the interruption of the supply concerned and its non-re-entry into service until the defects causing the danger have been removed.
No, not by herself. A certificate of conformity adapted, recent and from an approved body may, subject to conditions, fulfil the function provided for in the regulations. Have the document confirmed to the notary.
No. For an apartment sale, it concerns the prescribed private area, without attesting all the collective equipment and pipes.
Only if it meets the specific conditions for exercising real estate diagnosis, including gas certification and independence. Maintenance and regulatory diagnosis are two distinct tasks.
There is no single national tariff. The price depends in particular on the accommodation, the professional, the travel and any other diagnostics ordered. Compare quotes clearly specifying the services.
The ten files in this collection distinguish between the obligations, validity periods and the competencies specific to each control. To find a professional, see also the directory of diagnosticians implanted in Soissons (02200).
Records 07 to 10 are in preparation. Their links will take over the planned permalians and will not be publicly accessible until after publication.
General information verified on 1 November 2026. For a particular file, seek the opinion of the competent diagnostic officer and notary. This guide does not replace a regulatory report or a safety response.
