Looking for a company to carry out thermal insulation in Geneva usually means dealing with a dense, older or semi-detached building, where every intervention also affects neighbours, a property manager or a co-ownership. Whether you own a house, co-own a building in Les Pâquis or run a small business premises, insulating a home in Geneva means understanding the building properly before talking about materials.
On sos-travaux.ch, you describe your work online; the request is passed on to craftspeople and companies in the area, who contact you to prepare a free, no-obligation quote.
The most common insulation work in Geneva buildings
Thermal insulation covers several distinct kinds of work, which are not all equally relevant depending on the building:
- insulating facades, from the outside or the inside;
- insulating the roof and attic;
- insulating floors and cellars;
- treating thermal bridges, the points where heat escapes faster (balconies, slabs, frames);
- replacing windows.
In Geneva, much of the building stock is made up of apartment blocks. In dense neighbourhoods such as Les Pâquis, Les Eaux-Vives, Plainpalais, La Jonction or Champel, you find terraced buildings aligned along the street, sometimes with an inner courtyard. In this type of building, the street facade and the courtyard facade do not always face the same constraints: one may be very visible from public space, the other much less so.
For a house, the question is different: the roof, attic and windows are often the first items to look at, as they can be reached without touching the whole envelope.
A lakeside climate: mild winters, hot summers in town
Geneva sits at the end of Lake Geneva, on low ground, with fairly mild winters and hot summers in town. This changes how you think about insulation. It is not only about keeping heat in during winter: a poorly insulated roof or attic is also felt in summer, when rooms under the roof heat up and struggle to cool down.
In a very urban setting, narrow streets and mineral surfaces retain heat. Good roof insulation and a suitable choice of windows contribute to summer comfort as much as winter comfort. If you are also thinking about cooling, the page on air conditioning in Geneva covers that topic separately; but starting with the building envelope is often more logical.
As the altitude is low and winters are milder than in the mountains, do not expect the same constraints as at altitude; it is rather the age of the building, its orientation and its heating system that set the priorities.
Old town, protected neighbourhoods and older buildings
Geneva’s old town spreads over a hill around Saint-Pierre Cathedral. It and certain other neighbourhoods are protected. In practice, this means that changing the appearance of a facade, a roof or windows may be restricted, or even ruled out.
In an older building:
- external insulation may be difficult or refused, because it hides frames, cornices or mouldings;
- internal insulation requires precision: it slightly reduces living space and must take into account the damp in old walls;
- attics, floors and cellars often remain more discreet solutions;
- replacing windows may be regulated when the look of the facade matters.
A craftsperson who knows older buildings will begin by examining the state of the walls, the existing ventilation and the way moisture moves, before proposing a solution. Avoid offers that promise the same method for every building.
Procedures: permit, property manager, co-ownership
Permit. External insulation changes the facade: a permit may be required depending on the municipality and the building. In Geneva, building permits are issued by the canton, through the Office des autorisations de construire. Depending on the scale of the project and its location, you need to check with that office or the municipality what is required, especially in a protected zone. Do not start facade work before you have that answer.
Energy rules. The canton has a cantonal energy law (LEn) and a cantonal energy office (OCEN). Buildings Programme subsidies in Geneva depend on them. The conditions for granting aid, the work covered and the order of the steps should be checked with the OCEN: an application filed too late can jeopardise the aid.
Rented building. Geneva has many rented buildings run by property managers (régies). If you are a tenant, you cannot decide alone to insulate a facade or a roof or to change windows: the owner’s agreement is needed, and the property manager is generally the contact. If you are a co-owner, work on shared parts (facade, roof, cellars) is decided at the owners’ meeting.
Where to start: the CECB
Before requesting quotes, the CECB (cantonal energy certificate for buildings) helps set priorities. It avoids spending on new windows when the roof or cellar lets out more heat. In a co-owned building, it also provides a common basis for discussion at the meeting rather than comparing impressions.
Preparing your insulation quote request in Geneva
The more precise the description, the more comparable the quotes. Please state:
- the type of building (house, apartment block, semi-detached, older or protected building) and its approximate address;
- the parts concerned: facade, roof, attic, floor, cellar, windows;
- your status: owner, co-owner, representative of a property manager, or tenant with the landlord’s agreement;
- whether a CECB exists or a subsidy application is under way;
- access constraints: narrow street, courtyard, high floor, need for scaffolding;
- any protection of the building or neighbourhood.
A good quote names the areas, the type of insulation and the materials, specifies the finishes (render, plaster, lining, cladding), states whether the existing insulation is removed, and says how thermal bridges are treated. It should also specify what concerns scaffolding or access and waste removal.
What makes the cost vary: the area to be treated, the technique chosen, the condition of the substrate, the difficulty of access, the height of the building, any protection of the site, and the number and size of windows. No reliable figure can be given without seeing the building: it is the quote that sets the price, hence the value of comparing several.
Ready to move forward? You can request a quote by describing your work; your request is passed on to craftspeople and companies in the area.
To complete your project in Geneva
- Trade page: thermal insulation
- City page: work in Geneva
- Canton page: canton of Geneva
- Other work in the municipality: air conditioning in Geneva, electrician in Geneva, interior painting in Geneva
Updated 29 October 2026