Once the seat of the Prince-Bishops of Basel, Porrentruy is the main town of Ajoie, its château overlooking a well-preserved old town.
Flat prices in Porrentruy run at CHF 4,400 per m², a level that has stayed in step with Jura. A commune like this one moves with the cantonal cycle rather than against it, so the wider trend is a fair guide for your own estimate. The premium over Jura has a practical effect at resale. Buyers arriving from cheaper communes negotiate hard on condition, because they are already stretched on the price per square metre before they walk in. Out of 49 communes measured in Jura, Porrentruy sits at position 18. The communes immediately above and below are the ones a buyer will actually compare against, far more than the cantonal average.
The 5 percent premium on flats over houses in Porrentruy is unusual and needs reading carefully. It normally means the flats sold recently were new or central, while the houses were older and priced mainly on their land. Up 3.1 percent in a year, Porrentruy has been priced by whoever was willing to pay most for a small number of properties. In a commune with few sales, that is exactly how a median gets moved.
Within the Porrentruy district, Porrentruy lands 22 percent from the local median. A cantonal average mixes city and countryside, so it flatters some communes and penalises others. The district figure removes most of that distortion. The largest group of homes in Porrentruy, 22 percent, dates from before 1919, with the rest spread across the other bands. Where stock is this varied, a commune price per m² carries less weight and the comparison has to come down to buildings of the same age.
Average size in Porrentruy is 94 m² across 3.6 rooms. Compare your own property with that figure before you read any price per square metre, because an outsized home rarely sells at the local rate and a small one often beats it. Half the flats sold in Porrentruy went above CHF 4,400 per m² and half below, which puts the commune 7 percent from the Jura median. One exceptional sale barely moves a median, and that is why we use it instead of an average. Over 25 years the median moved from CHF 4,400 to CHF 7,000 per m², a change of +59 percent. That is the market, not your property. A flat renovated in the meantime followed a different curve entirely.
Porrentruy turns over enough stock to give a reliable read. The practical benefit shows at negotiation, where both sides can point to comparable sales from the same year, which shortens the distance between asking price and signature. If you are weighing a sale in Porrentruy, the useful question is not the commune price but yours. A few minutes and a handful of characteristics are enough to place your property inside the local range.
Building stock from the Federal Register of Buildings and Dwellings (FSO), updated October 18, 2026
Market data updated on October 12, 2026
A range set against the price levels of your commune and the profile of your property.
Value my property →Around CHF 4,400 per m² for a flat, which is 7 percent from the Jura median. Houses are priced separately and usually land somewhere else entirely, so work from the figure that matches your property type.
The reference is CHF 4,200 per m² in Porrentruy. It averages a small number of sales, since houses change hands far less often than flats, so treat it as a bracket to work inside rather than as a price.
22 percent of homes in Porrentruy date from before 1919. That age band sets the technical agenda for a buyer here, since insulation, heating system and windows are what decide running costs for the next twenty years.