It is not construction that is stopping, it is the office
The three figures are published by the same service, on the same perimeter, and are read here over the same twelve months ending in August 2026. Authorised dwellings rise to 354,800, up 3.9 % year on year. All non-residential premises fall 5.1 %, to 35.0 million square metres. And offices fall 14.6 %, to 2.98 million square metres (source: SDES, Sit@del2 database, metropolitan France, recent months provisional). Offices are falling close to three times faster than premises as a whole. What matters is the gap between the two falls. If construction demand were collapsing, housing would fall with the rest: it rises. If the office were turning into something else, other premises would absorb the floor area: they fall three times more slowly, but they fall. So the floor area that no longer goes into offices goes nowhere else. One detail completes the picture: the floor area of authorised dwellings rises only 2.0 % while their NUMBER rises 3.9 %. That is 76.6 square metres per authorised dwelling against 78.0 a year earlier. More dwellings are authorised, but smaller ones.
🔍 Focus: why a permit beats a survey
A business survey asks executives what they think. Filing a permit commits architect fees, soil surveys, a sale agreement and, most of the time, a bank agreement in principle. Nobody files an office permit just to see. It is an opinion that has already cost money, which makes it a more honest leading indicator than most. The trade-off is its slowness: it says nothing about the current quarter. It says what the market believes about three or four years out. Two reading precautions apply. First, recent months in Sit@del2 are provisional and revised upwards, which means the measured fall is more of a floor. Second, the Eurostat index is seasonally adjusted, and that is essential, because permit filings collapse every August and every December for reasons that have nothing to do with the economy.
- Authorised office floor area, 12 months to August 2026: 2.98 million sqm, down 14.6 % year on year (source: SDES, Sit@del2, metropolitan France)
- Dwellings authorised, 12 months to August 2026: 354,800, up 3.9 % year on year (source: SDES, Sit@del2)
- All premises authorised, 12 months to August 2026: 35.0 million sqm, down 5.1 % year on year (source: SDES, Sit@del2, metropolitan France)
- BT01 all-trades index, July 2026: 138.9, up 4.1 % year on year, against 8.8 % for TP09 asphalt (source: INSEE)