Window hardware here does not fail randomly. Three environmental mechanisms account for almost everything, and each one has a season in which it announces itself.

Ultraviolet on rubber, which is the shortest clock on the window

Gaskets, brush strips and seals are the first components to go. Ultraviolet breaks down the rubber, it hardens, shrinks back from the corners and cracks, and on a south or west-facing elevation that happens far faster than most owners expect. The first sign is not a draught — the room is air conditioned and pressurised, so what you notice is a fine layer of dust on the sill of a window that has been closed all week. By the time you can feel air movement, the seal has been gone a long while.

Dust as a grinding paste

Sliding windows carry their weight on small rollers running in a shallow bottom track, and that track is a collection point for the finest dust in the city. Dust plus roller equals grinding paste. The rollers develop flat spots, the panel goes heavy, someone puts a shoulder into it, and now the track has a deformation in it too — at which point new rollers alone will not fix the problem. Caught early it is a clean and a set of rollers. The same failure at patio-door scale is covered under sliding door repair.

Dust again, in the drainage

Aluminium and uPVC frames are designed to let water into the bottom chamber and drain it back out through weep slots on the external face. Those slots are a few millimetres across and they silt up with the same airborne dust, quietly, over years. Nothing reveals it because Dubai rain arrives a handful of times a year — and then the chamber fills, has nowhere to go, and water appears on the inside sill of a window that has never leaked. Owners reasonably conclude the window has failed. It has not; its drains are blocked, and clearing them takes minutes.

Thermal movement, and the window that only sticks in summer

Aluminium expands measurably between a February morning and an August afternoon. An opening light set with tight clearances closes cleanly in winter and binds in summer. If a window only catches in the hot months, the hardware is probably fine and the clearance is the issue — and forcing it through August is how a clearance problem turns into a bent friction stay.

Skill is rarely what stops a window repair. Supply is. Aluminium and uPVC profile systems are superseded over the years, and the hardware designed for them goes with them — a friction stay or a gearbox made for a system discontinued a decade ago is often simply not available anywhere in the market.

When that happens there are two routes. A current equivalent can sometimes be adapted, which works well for handles, rollers and seals and less well for anything that has to fit a specific slot or screw pattern in the profile. Or the window gets replaced. What we will not do is order a part that we know is unlikely to arrive and leave you waiting on it.

Photographs help enormously here. A close shot of the handle, the hinge or stay, and any markings stamped on the existing hardware usually lets us establish availability before a visit rather than after.