The cylinder is enough more often than people expect
The cylinder holds the secret and comes out with a single screw on the edge of the leaf. It is the part to change when the trouble lies with the keys rather than the mechanism. Across the Beauversant estates, where many houses were built between the nineteen sixties and the eighties and have changed hands several times, a spare set is almost always circulating somewhere.
Around chemin du Grand Revoyet, and more so since the metro reached the south of the commune, the rental stock turns over quickly: studios and furnished flats change tenant as hospital postings change. Between two tenancies, replacing the cylinder of the flat door is the standard move, and it is done without touching the lock case.
Remember the rest of the keyring. At many addresses in Basses-Barolles the same key opens the shared garage door, the cellar and the bike store. Replacing the cylinder on the front door alone leaves three other ways in untouched, and that is exactly what is looked at during the assessment. Ask the managing agent which of those closures is communal before anything is ordered.
When the mechanism is at fault, not the secret
A complete lock is replaced when the mechanism itself is failing: a bolt that no longer throws, bent linkage, a distorted faceplate. On the sloping plots of Beauversant and above Le Vallon, the top bolt of a multipoint sometimes stops engaging while the lock is perfectly sound — the frame has moved, and adjustment comes first. Hinges and keeps are checked in that order, leaf closed then open.
Old doors in Le Bourg raise a different question. Many carry a rim lock screwed onto thick timber, with hole centres that match no current standard. Replacing like for like means measuring before ordering, and on the most characteristic frontages of the centre the appearance from the street deserves to be kept. An oak frame is worked with a chisel rather than a router.
Either way the order is the same: inspection on site, measurements, an itemised quote handed over before the work, then a detailed invoice at the end. On the lanes of Les Barolles, where the gate and the outbuilding door are often weaker than the front door, that inspection covers every closure rather than a single one.
How does this service work?
Techniques, typical situations, standards and things to watch out for: it is all on our lock and cylinder replacement page. This page focuses on what the service involves in Saint-Genis-Laval.