Trade Guide: Essential uPVC Window Parts to Keep in Your Van

Trade Guide: Essential uPVC Window Parts to Keep in Your Van. Whether you are a glazing contractor, joiner, or a homeowner managing repairs, carrying a well-chosen selection of upvc window parts will reduce call-backs, increase first-time-fix rates, and improve customer satisfaction.

Why carry spare parts on every job

A well-stocked van lets you convert a routine service into a completed repair rather than a return visit. Many uPVC failures are caused by worn handles, seized friction stays, snapped espagnolette rods, or failed seals; these are usually quick to replace on site. For homeowners, knowing the common parts that need attention helps when booking trades or attempting simple DIY repairs safely.

Core upvc window parts to keep in stock

Focus on items that are small, versatile, and frequently required. Keep multiple finishes and handed options for hardware where applicable.

• Window handles: locking and non-locking handles in common spindle sizes (carry top-selling brands and neutral finishes).
• Espagnolette mechanisms and rods: complete strips and individual rods for casement and tilt-and-turn windows.
• Friction stays and hinges: a selection of lengths and strengths; include anti-tilt and restrictor variants.
• Euro cylinders and cylinder guards: standard 5-pin euro cylinders, thumbturn cylinders and anti-snap varieties.
• Keeps, keeps plates and striker plates: for espag locks and multipoint systems; carry adjustable keeps where possible.
• Glazing beads and packers: short lengths of common bead profiles and a set of plastic packers in 1mm, 2mm, 3mm and 5mm.
• Seals and gaskets: window-grade EPDM seals, compression brush seals, and glazing gasket sections.
• Fixings and screws: stainless steel self-tapping screws and coach screws in a range of lengths; small fixings tray for hinge screws and handle screws.
• Quick seals and adhesives: neutral-cure silicone, foam backer rod and double-sided glazing tape for emergency sealing.

Tools and consumables to pair with parts

Having the right tools prevents damage to frames and ensures professional finishes. Keep these on hand:

• Multi-bit screwdriver and Torx set; 2.5mm and 3mm hex keys for handle spindles and gearbox adjustments.
• Pack of stainless steel drill bits and a cordless drill with adjustable clutch.
• Pliers, centre punch and a small mallet for sash manipulation.
• PTFE lubricant and light oil for moving parts; alcohol wipes and cloths for cleaning seals and glass.
• Feeler gauges or a set of plastic shims for packing glass and setting hinges.
• Glass suction pad for larger panes; heavy-duty gloves and safety glasses for safety.

Practical trade advice for common repairs

Certain quick checks will let you diagnose faults swiftly. For handles that are loose or click without engaging: check the spindle length and handle screw centres, then replace the handle or tighten screws. For windows that will not lock: inspect the espagnolette mechanism for broken cams or snapped rods; replacing the complete strip is often faster and more reliable. If a sash drops or scrapes the frame: fit a heavier friction stay or re-pack the hinges using appropriate packers; check that the frame is square before forcing adjustments.

DIY guidance for homeowners

Homeowners can manage minor jobs safely if they carry basic parts and follow sensible precautions. Always support the sash before removing any fastenings; work with a second person for larger sashes. Measure handle spindle dimensions and screw centres before buying a replacement. For seal replacement, remove the old gasket carefully and clean the groove; fit the new gasket with light silicone or glazing tape if it is a compression fit. Do not attempt glass replacement unless you have the correct glazing tools and PPE; for cracked or loose glass, contact a professional.

Organisation and stock management for trades

Label parts clearly and keep them in small, compartmentalised boxes so you can grab the correct profile or length quickly. Maintain a basic stock list and replenish after every job; digital inventory apps or a simple spreadsheet with minimum levels reduces the risk of running out. Keep the most common parts like handles, euro cylinders and a basic set of friction stays in an easily accessible compartment; bulkier items such as full-length espagnolette strips can be stored lower down in the van.

What to measure before you replace parts

Accurate measurements avoid wasted visits. Note the handle spindle diameter and length; measure screw centre distances for handle rose plates. For friction stays take the total length and note whether the stay is left- or right-handed. For espagnolette strips record the faceplate length and the distance between gearbox fixing holes. If replacing a euro cylinder, measure the overall cylinder length and record the existing cam position so the replacement aligns correctly. If unsure, take clear photos and a short video of the operation for reference when ordering parts.

Where to find further resources

For a wider selection of components and supplier guidance, visit our pillar page on double glazing supplies: /guides/double-glazing-supplies. It lists standard parts, manufacturers and more in-depth technical resources for window systems.

Recommended Products

Based on this article, you may find these products helpful:

• Structural Glazing Tape - 20mm
• Security Glazing Tape
• TSS Cockspur Window Handles
• TSS Offset UPVC Window Handles
• ERA Universal Inline Window Handle

Conclusion and next steps

Keeping a pragmatic stock of upvc window parts plus the right tools will boost first-time fix rates and make small repairs straightforward. Start with handles, espagnolette strips, cylinders, friction stays, seals and a compact tool kit; then refine your inventory based on the types of windows you service. If you need help choosing specific parts to match a brand or profile, contact a supplier with photos and measurements so you can avoid returns and complete jobs efficiently.