The leaf you never open ends up jamming both
Grand town houses in the town often have a front door with two leaves, one of which stays bolted shut all year at top and bottom. That fixed leaf still moves like everything else: the timber swells, the fixings work loose, and after a few winters it no longer sits quite where it should. The leaf you do use then stops finding its strike plate, and you find yourself pushing a little harder every week.
That is the moment to have the whole assembly checked, not just the lock. Adjusting the strike plate, resetting the top bolt or realigning the fixed leaf is often enough to restore a clean closing action. Replacing the mechanism without correcting the geometry means fitting a new part under permanent strain: it will wear exactly as the last one did. On these older doors, the work is in fact more often a matter of adjustment than of replacing anything at all.
Whatever takes the rain does not age like the rest
The other weak point of a walled property is everything that stays outside. The lock set into a gate pillar, the strike plate bedded into the masonry, the padlock on the pedestrian gate and the espagnolette bolt on the service door all take rain, frost and sun without a break. Pillars shift slightly over the years, the gate ends up rubbing on its hinge, and the key needs an ever more precise touch to enter the barrel.
Those locks have one thing in common: they never get any maintenance, because they are used without thinking. An annual check of the fixings, the strike plates and the play in the opening leaf prevents most jams, and can be done in a single visit for every way into the plot. When a key starts to catch on a gate, whatever you do, do not force it: that is usually the last warning before it seizes completely, and a broken fragment makes what follows a great deal harder.
How does this service work?
Techniques, typical situations, standards and things to watch out for: it is all on our locksmith repairs page. This page focuses on what the service involves in Le Bouscat.