Construction project management in Hermance
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 Hermance, where four residential buildings in ten were built before 1946. The independent firm commissions the surveys, draws the plans, files the permit application as a registered MPQ agent, compares contractors' bids and runs the site to SIA standards.
Renovating in Hermance, what should you expect?
Hermance covers 143 hectares and has 1,236 residents at the end of 2025, according to its OCSTAT municipal overview. That is 862 residents per km2. The table of residential buildings by municipality counts 350 buildings at 31 December 2025, of which 276 are single-family houses, close to four in five.
The share of old buildings is high. 141 buildings predate 1946, which is four in ten, while 78 were put up after 2000. An old single-family house is therefore the most likely case. This kind of building holds surprises behind its finishes, and the state of the facades and the roof covering conditions everything else. The budget has to allow for that from the first estimate.
The Hermance municipal website (in French) gives the contact details of the town hall.
Permits in Geneva
Under the permit types defined by the canton, the fast-track procedure (APA) applies to works that do not alter the general appearance of an existing building. Work that does alter it falls under a full application, called DD (demande définitive). On an old house, the line between the two is often drawn at the facade and the roof.
Before the works, the search for asbestos, PCB and lead is part of the file, as explained on the page Rénover, transformer ou démolir sans danger (in French). For the whole route, see our guide to building permits and procedures in Geneva.
Types of work in Hermance
- Facade renovation and insulation, a sensitive point on 141 buildings from before 1946.
- Roof renovation, to be dealt with before any interior fit-out.
- House renovation, for the 276 single-family houses.
- Bathroom renovation, with pipework replaced in old buildings.
- Energy renovation, to reconcile an old structure with lower consumption.
- Building trades, to understand who does what and in which order.
How HMG manages your project in Hermance
Some owners want a single agent. HMG then draws up the plans, files the permit application and manages the works. Others have already chosen an architect, a partner the firm works with. The architect designs the project and obtains the permit, then HMG takes over the file for construction.
In an old house, checking the workmanship matters as much as choosing the contractors. The firm inspects the substrates on site before they are covered, approves samples and junction details, and records every reservation in the minutes. Unforeseen work is priced and put to you before it is ordered, so that the budget stays readable up to the final account.
Municipalities in the same sector
Other municipalities of the left bank sector, between the Arve and the lake, have their own page on this website.
Projects by HMG in the Canton of Geneva
Frequently asked questions
What share of buildings in Hermance are old?
According to OCSTAT, 141 of the 350 residential buildings were built before 1946. That is four buildings in ten. 78 buildings postdate 2000.
Do new windows or facade work need a permit?
The answer depends on the effect of the work on the general appearance of the building. Work that leaves it unchanged falls under the fast-track procedure, the rest under a full application. The firm clarifies this with the cantonal building permit office before design work begins.
How do you avoid cost overruns in an old house?
By investigating before pricing. Probes and surveys carried out at the start reduce discoveries during the works. Each extra is then shown to you with its price before it is ordered.
Related guides and pages
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