Structural and general building work in Saint-Tropez

Regulatory seismic zoning places Saint-Tropez in zone 2, described as low. It is the only such case among the eleven communes in which we work: the others fall under zone 4, medium, apart from two classified in zone 3, moderate. The gap is not theoretical — it governs the applicable seismic design provisions, and therefore changes the sizing of a ring beam, of a bracing system or of an underpinning. A structural argument carried over from a site in the Alpes-Maritimes does not transpose here: it is taken up again from the zoning.

What the zoning concedes, the exposure takes back. The peninsula is open to prevailing winds on several orientations, with no relief screen comparable to the Riviera corniches: wind loading is a design factor for external works here — balustrades, pergolas, roof overhangs, anchorages for large joinery. Earthquake and wind are two distinct load cases, and they do not point to the same weak spot. Here, we put the wind question first.

The old core of the town is a tight party-walled fabric, with narrow lanes and elevations set on the shore — the historic fishermen’s quarter gives the measure of it. The party-wall condition is a structural fact before it is a neighbourly one: a load-bearing wall is often shared, and an underpinning commits two properties at once. That fabric, set directly against the water, further combines rising damp at the base of walls with salt deposition on exposed elevations. One does not consolidate the foot of a wall without first treating what is wetting it.

At the other end of the register, the shoreline villas call on large joinery, exposed concrete and fine metalwork: the structure is visible, and span replaces wall. Two situations, two ways of founding. An old party-walled fabric is taken up bearing by bearing, never unloading a whole wall at once; a villa open to the sea is founded for concentrated loads and cantilevers. We settle that diagnosis before any study, because it governs the rest.

The town of Saint-Tropez maintains a ban on the circulation of construction plant over a window running from 2 p.m. to 7 a.m., together with a derogation granted to concrete mixer trucks up to 32 tonnes. It is a municipal policing measure, not a planning rule: it appears in no planning document, and it escapes anyone who reads the application file alone. Its consequence for structural work is nonetheless direct — plant movements have to fit inside the morning, while the concrete supply has a derogation of its own. A pour is planned from that window, never the other way round.

To that is added a demanding geography: the peninsula is served by only a restricted number of routes, with no alternative, and summer road saturation there is structural, not accidental. The old core is not accessible to plant — manual handling is the rule. Saint-Tropez is, finally, the commune furthest from our Nice base, more than a hundred kilometres away. All of this is said beforehand, not during. Our crafts in Saint-Tropez begin with the structure: high-end renovation, bespoke finishes and interiors, extensions and fit-outs come afterwards to lean on it.