Architect
in the Pays de Gex,
on Geneva's doorstep.

The Pays de Gex is a distinctive area, wedged between the Jura range and Lake Geneva, 10 to 30 minutes from Geneva depending on the municipality. 27 municipalities, around 100,000 residents, one of the fastest-growing populations in France and some of the highest pressure on land in the country. The immediate proximity of CERN, the WHO, the UN and the Geneva job market attracts cross-border residents with high purchasing power who expect high standards of architectural quality and energy efficiency. Working with an architect in the Pays de Gex who knows this particular context helps avoid unpleasant surprises from the feasibility stage.

Our office is in Aix-les-Bains, Savoie, about 1 hr 30 from the Pays de Gex via the A40. While we work mainly in Savoie and Haute-Savoie, we also occasionally cover the Ain and the Drôme, particularly when the project matches our expertise: contemporary villa, major energy renovation, house construction in the Pays de Gex on a complex plot. We organise site visits and meetings by half-day to keep travel efficient.

The Pays de Gex has a wide range of building types: contemporary villas in Divonne or Prévessin, energy renovations of 1970s-80s houses in Gex or Thoiry, extensions on small plots in Ferney-Voltaire or Ornex, chalets and second homes at the foot of the Monts Jura. Each municipality applies its own local plan (PLU), often strict on heights, roof pitches and facade materials, in order to preserve the character of the villages. Part of the area is also covered by the Loi Montagne (Thoiry, Échenevex, Crozet, Lélex), which brings additional rules on landscape integration and continuity with existing development.

Our approach is the same for every project in the Pays de Gex: a free preliminary feasibility study, detailed analysis of the municipal local plan, a commitment on budget and schedule, and a single point of contact from start to finish. As state-qualified architects (French DEA degree) who also work as project manager and general contractor, we handle the design, the building permit, the organisation of the trades, site supervision and handover. Whether you live in the Pays de Gex, are a cross-border worker employed in Switzerland, a Geneva-based investor or an expatriate manager at CERN, you benefit from a structured approach and close follow-up, even from a distance.

Gex (01170) — Main town of the Pays de Gex, around 13,000 residents, at the foot of the Jura. A mix of old houses in the centre, recent housing estates and contemporary villas on the hillsides overlooking Lake Geneva. Energy renovation is common on the 1970s-80s housing stock.

Ferney-Voltaire (01210) — Voltaire's town, around 10,000 residents, 6 km from Geneva and a stone's throw from CERN. A historic centre under architectural scrutiny, small urban plots, complex extensions to manage. Strong demand for high-end renovations and well-integrated extensions.

Divonne-les-Bains (01220) — Spa town with an international golf course, around 10,000 residents. The most premium segment of the Pays de Gex: high-end contemporary villas, swimming pools, private spas, plots with views of Lake Geneva. Swiss cross-border and international clients.

Saint-Genis-Pouilly (01630) — Home to CERN, around 13,000 residents, growing fast. New developments, contemporary villas for expatriates, extensions to detached houses. Active planning, with a local plan recently tightened on heights and density.

Thoiry (01710) — Around 5,500 residents, on the slopes of the Jura. The Loi Montagne applies, with tight control of roof pitches and volumes. Timber house building, high-altitude chalets, second homes. Close to the Crozet-Lélex ski slopes.

Prévessin-Moëns (01280) — Around 8,000 residents, a residential municipality on the Geneva border. Strong demand for contemporary family villas and energy renovations of older housing. Several recent high-end housing estates.

Ornex, Cessy, Segny, Versonnex — The northern ring around Ferney-Voltaire, around 3,000 to 5,000 residents each. Small urban plots, extensions adding one or two storeys, renovations of 1980s houses. Local plan rules vary from one municipality to the next and must always be checked.

Collonges, Farges, Péron, Chevry — More rural municipalities in the south of the Pays de Gex, towards the Rhône and the Haut-Bugey. Old buildings to restore, new builds on more affordable plots, strong potential for families looking for a quieter setting while keeping Geneva 25 minutes away.

Renovation in the Pays de Gex is nothing like renovation in the rest of the Ain. Land is scarce and expensive, pulled up by the proximity of Geneva: buying in order to renovate often remains more affordable than building, and that is what explains the share of heavy renovation projects in the area.

A housing stock to renovate, not to freshen up. Gex stone farmhouses, terraced village houses, and houses from the 1970s and 1980s: three families of building, three logics of work. The first two raise the question of old fabric — vapour-open walls, timber floors, roof structure. The third is above all a thermal subject: insulation, windows and doors, heating system, ventilation.

The energy rating changes everything. The least efficient homes are progressively leaving the rental market under the timetable set by the Climate and Resilience Act. For a landlord in the Pays de Gex, energy renovation is no longer a comfort decision but a condition for continuing to let. The available support — MaPrimeRénov', CEE — requires an RGE certified company: we are one, RGE CertiRénov no. CR-2026-73-0095.

The real sticking point is availability. Swiss construction sites absorb part of the local workforce, and the lead times of firms in the area suffer for it. We work with our own teams, coming from Savoie: it is our own programme that sets the pace, not the availability of a string of outside firms.

On the planning side, each municipality in the Pays de Gex applies its own code, and the surroundings of listed monuments fall to the opinion of the ABF heritage architect. We check both before drawing.