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Buying & Fitting Guides

Find the right part, first time

Two quick guides to make sure your replacement fits before you order.

200+ gearboxes.
One simple finder.

UPVCSTORE stocks the centre cases that fit real uPVC, composite & aluminium doors.

Find My Gearbox

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Filter to parts that physically fit your door

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Yale, Fullex, GU, Lockmaster, Avocet & more
Door Handle Buying Guide

Not Sure What Size Door Handle You Need?

Replacing a uPVC door handle comes down to two key measurements: the PZ (keyhole to spindle) and the Screw Centres (distance between the fixing screws). Get these right and your replacement fits first time — no returns, no guesswork.

Read The 2-Step Measurement Guide →
uPVC Door Handle - PZ Measurement Diagram showing how to measure PZ from the centre of the handle spindle to the centre of the euro cylinder keyhole on a uPVC door handle. PZ Screw Spindle Keyhole Screw
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GU Gearbox Door Lock Centre Case Old Style Replacement uPVC Mechanism 35mm
Yale Platinum 3 Star High Security Euro Cylinder Lock UPVC Doors Anti Snap TS007
UPVC Double Glazing Trojan Sparta 92PZ Sprung Patio Door Handle Set PVC 212mm Screw Centers

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