The average price per m² in Saint-Cast-le-Guildo is 4 746 €/m² for an apartment, based on actual notarised (DVF) sales. About 45 transactions are recorded each year.
Mood illustration of the Breton coast.
The average price in Saint-Cast-le-Guildo stands at 4 746 €/m², according to the DVF transactions actually registered before notaries. The municipality has 5 575 dwellings for 3 371 permanent inhabitants: the stock is sized for a summer population more than ten times that of winter. Two dwellings in three are second homes.
Prices from the DVF file (Demandes de valeurs foncières, published by the DGFiP), transactions actually recorded at the notary at municipality level. Cross-referenced with the Notaires de France - INSEE indices. Learn more about our methodology.
After 3 742 €/m² in 2021, the average price in Saint-Cast-le-Guildo reaches 4 746 €/m² in 2026, roughly +27 % over the period.
The Saint-Cast market rests on a ratio of one to ten between the winter and the summer population. That amplitude, greater than in most municipalities of the Côte d'Émeraude, explains why the stock counts 5 575 dwellings for 1 799 main residences. Prices are set by outside demand arbitrating between Breton resorts, and not by the financial capacity of the 3 371 permanent inhabitants.
New supply is doubly bounded. The Coastal Act limits the spread of building, and the listed and registered sites of the pointes of Saint-Cast and of la Garde cover precisely the most sought-after seafront locations. The result: scarcity is concentrated where demand is strongest, which widens the gap in value between a property with a sea view and one set back a few hundred metres.
Set back in its surroundings, Saint-Cast-le-Guildo sits just below Saint-Malo and well above the inland towns of the Côtes-d'Armor.
The feat of arms that founds local memory is the battle of 11 September 1758. British forces landed near Saint-Briac were beaten by the French troops of the duc d'Aiguillon as they were re-embarking, on the main beach. A commemorative column, where a greyhound brings down a leopard, still marks the site.
The present municipality is the product of a merger: on 1 January 1972, Notre-Dame-du-Guildo and Saint-Cast came together to form Saint-Cast-le-Guildo. That origin explains the structure of the territory, which remains two-centred: the seaside resort to the north, around the Grande Plage and the town centre, and Notre-Dame-du-Guildo to the west, on the Arguenon estuary.
The port d'Armor, opened in July 2009, gave the municipality a first-rank marina: eight hundred berths on pontoons, twenty berths reserved for professional fishing, a basin that stays accessible whatever the tidal range. Shellfish farming remains the second activity, with fifty-five kilometres of mussel bouchot lines and some thirty hectares of oyster beds in the bays of the Fresnaye and of the Arguenon.
The market is that of a resort on the Côte d'Émeraude: 3 668 second homes out of 5 575 dwellings, a vacancy rate of 1,9 %, and a population that goes from around 3 500 people in winter to more than 35 000 in summer. Buyers come mainly from Brittany and the Île-de-France, looking for a house close to one of the seven beaches. The absence of a station in the municipality, the nearest being at Plancoët some ten kilometres away, steers the market towards the second home rather than the daily commute.
The average price in Saint-Cast-le-Guildo is 4 746 €/m², calculated on the DVF transactions actually completed before notaries. That is a high level for the Côtes-d'Armor, well above Saint-Brieuc.
No. The municipality comes from the merger of 1972 and remains two-centred: the seaside resort to the north, with the Grande Plage, Pen-Guen and the port d'Armor, and Notre-Dame-du-Guildo to the west on the Arguenon estuary. The seafront sectors, notably around the pointe de Saint-Cast, are valued very differently from the inland areas.
Because the stock is almost entirely taken up: 66 % second homes and only 1,9 % vacancy. To that is added the Coastal Act, which forbids building within the hundred-metre strip outside urbanised areas, and the listing of the pointes of Saint-Cast and of la Garde, precisely the most sought-after sectors, which are frozen to construction.
No, that is a common confusion. Despite its name, the château du Guildo, where Gilles de Bretagne was imprisoned in 1450, stands in the neighbouring municipality of Créhen, on the other side of the Arguenon. Saint-Cast-le-Guildo does have the column of 1758, the church of Saint-Cast, the chapelle Sainte-Blanche and the pierres sonnantes of the Guildo.
This analysis is published by Immover, an independent observatory founded by Antony Barbier. Data sourced from official sources (DVF, INSEE, Notaries of France).