Construction project management in Collex-Bossy
Planning building work? Apartment, house or building renovation, a new storey or a roof extension, running the project is our job.
For a renovation, an extension or a new house in Collex-Bossy, HMG Construction Management SA brings everything into one appointment. That covers the plans, the permit application filed as an agent registered on the Geneva MPQ list (mandataires professionnellement qualifiés, the cantonal register of qualified building professionals), the costing, the choice of contractors and site management.
Your building work in Collex-Bossy
Created in 1855, the municipality of Collex-Bossy covers 689 hectares and has 1,710 residents at the end of 2025, or 248 inhabitants per km². These figures come from the OCSTAT profile of Collex-Bossy. The table of residential buildings by municipality shows 414 buildings, of which 287 are single-family houses, close to seven in ten.
The age of the stock is mixed. More than one building in four dates from before 1946 (119), and 80 were built after 2000. Projects therefore range from the full overhaul of an old building to the extension of a more recent house. In every case the first question is the procedure, which HMG checks before pricing. The official Collex-Bossy website gives information on the municipal administration.
Procedures in Geneva
When the project is still open, for a large extension or a new build for example, a preliminary application, called DP (demande préalable), gets you the administration's answer on siting, use, height, volume and access. The application is prepared and filed online, as the cantonal page Je dépose ma demande (in French) explains. A complete demolition needs a separate application. See our guide to permits and procedures.
Types of work in Collex-Bossy
- House renovation, for the 287 single-family houses on record.
- House extension, when the family needs one more room or one more level.
- Adding a storey, another way of adding living space.
- Building conversion, to give an existing building a new use.
- Villa construction, for a new-build project.
How HMG manages your project in Collex-Bossy
If you are starting from scratch, HMG designs the project, files the application and remains your contact until the works are finished. If an architect is already advising you, they take the project up to the permit and HMG then manages construction, in agreement with them. The architect remains a partner on site.
HMG prepares a specification for each trade, consults several contractors and gives you a comparison table. Once the contracts are signed, the firm keeps the schedule, chairs the weekly meetings and checks quantities and invoices. At handover, it lists the defects and sees that they are put right.
Municipalities in the same sector
Collex-Bossy belongs to the Rive droite (right bank) sector. HMG's project management is also available to owners in the following municipalities.
HMG projects in the canton of Geneva
Frequently asked questions
What work is most common in Collex-Bossy?
Work on houses. The municipality has 287 single-family houses out of 414 residential buildings, hence the requests for renovations, extensions and added storeys.
What is a preliminary application for?
It tells you where the administration stands on siting, use, height, volume and access before detailed design begins. It is useful when the project raises a question of principle.
Should an old building be demolished or converted?
The answer comes from a priced comparison of both options, which HMG draws up from the condition of the building. Bear in mind that a complete demolition is applied for on its own, not within the construction file.
Related guides and pages
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