Construction project management in Thônex
Planning building work? Apartment, house or building renovation, a new storey or a roof extension, running the project is our job.
HMG Construction Management SA manages building work in Thônex, a dense municipality where single-family houses are nonetheless the most numerous buildings. The independent Geneva firm draws up the plans, files the permit application as a registered MPQ agent, prices the work, selects the contractors with you and runs the site through to the final account.
Your building work in Thônex
Thônex combines two realities. On the one hand, the municipal profile published by OCSTAT reports 17,060 residents at the end of 2025 on 382 hectares, or 4,466 people per square kilometre. On the other, the cantonal table of buildings shows that 1,422 of the 1,868 residential buildings are single-family houses, more than three in four. The remaining 446 buildings hold several dwellings, and a population of that size does not fit into 1,422 one-dwelling houses.
The owner of a villa and the owner of a flat are therefore equally likely to call us. In terms of age, the stock is fairly young. Only 201 buildings date from before 1946, a little over one in ten, and 490 were completed after 2000, more than one in four. In the latter, work mostly concerns the interior. In older houses, the envelope and the heating come first.
The official Thônex website (in French) presents the municipal services.
Permits in Geneva
For a villa, the LCI, Geneva's law on buildings and installations, sets the construction rules, including those of the fifth zone (the villa zone). A project in the fifth zone that needs no exemption can follow the fast-track procedure (APA), as can interior alterations. The firm first checks which zone your plot is in.
In a residential block, work inside the dwellings is governed by the LDTR, the law on the demolition, conversion and renovation of housing. Both situations are covered in our guide to building permits and procedures in Geneva.
Types of work in Thônex
- Villa renovation, for the 1,422 single-family houses in the municipality.
- Adding a storey, worth studying when the plot leaves no room to build outwards.
- Apartment renovation, in the 446 buildings with several dwellings.
- Bathroom renovation, a common request in homes built after 2000.
- House energy renovation, for houses that have not yet been insulated.
- Shop fit-out, in a municipality of more than 17,000 residents.
How HMG runs your project in Thônex
Some clients arrive with an idea, others with a permit already granted. In the first case, HMG handles everything, plans and permit application included. In the second, the architect has done the design work and HMG takes over the file for construction, in collaboration with them.
In Thônex, a building site is almost always close to other residents. The firm therefore plans deliveries, noisy working hours and access from the programme stage, and goes over them again at each site meeting. It prices the work trade by trade, puts contractors in competition and checks that every invoice matches the work carried out. HMG has managed five villas and six storey additions to buildings in Geneva and Meyrin.
Municipalities in the same area
Thônex belongs to the left bank, between the Arve and the lake. Seven other pages cover municipalities in that area.
HMG projects in the canton of Geneva
Frequently asked questions
Is Thônex a place of villas or of apartment blocks?
Both. OCSTAT records 1,422 single-family houses out of 1,868 residential buildings, yet the municipality has 17,060 residents on 382 hectares, which implies many dwellings in the other 446 buildings.
Can a storey be added to a villa in Thônex?
In some cases, depending on the zone and the LCI rules that apply to the plot. The firm studies feasibility, draws up the plans and files the permit application. It has managed six storey additions to buildings in Geneva and Meyrin.
How long does it take to get a price for the work?
The firm gives no figure without seeing the building. After the visit it prepares a trade-by-trade estimate, then consults contractors to obtain firm quotes.
Related guides and pages
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