Window Won’t Close: Causes and Next Steps for uPVC Windows

If your window won’t close properly, it can leave your home exposed to draughts, rain, and security risks. This common issue affects many uPVC windows over time, often due to wear and tear. At Window Repairs Sutton, we specialise in diagnosing and fixing these problems with our 10+ years of experience and public liability insured, DBS-checked technicians.

What This Usually Means

A window won’t close fully signals that something in the mechanism or frame has shifted or worn out. It might stick halfway, fail to latch, or leave a gap around the edges, compromising insulation and security.

This symptom often worsens gradually, starting with minor resistance before becoming impossible to shut. Ignoring it can lead to higher energy bills from escaping heat or even water damage during storms.

Common Causes

Several factors contribute to a window won’t shut properly. Wear on moving parts is the most frequent culprit in uPVC frames.

Worn or Faulty Hinges

Friction stay hinges bear the window’s weight daily. Over years, they bend, loosen, or seize, causing the sash to drop or catch on the frame.

Misalignment or Dropped Sash

Settlement in the building or frame expansion can push the window out of alignment. A dropped sash makes the window lean, preventing a snug fit.

Latch or Locking Issues

The window won’t latch if the multi-point locking mechanism sticks or the handle fails to engage. Corrosion or debris buildup exacerbates this.

Frame Distortion or Draught Proofing Wear

uPVC frames can warp slightly from temperature changes. Worn seals mean the window catches on frame edges, even if it seems straight.

Obstructions or Stiff Mechanisms

Dirt, paint, or perished rubber seals create resistance. Without regular window adjustment, these build up unnoticed.

Safe Checks Before Booking

Before calling for uPVC window repair, try these straightforward inspections. Always prioritise safety—avoid forcing the window, as this risks further damage or injury.

• Visual inspection: Open and close slowly. Look for visible bends in hinges, gaps larger than 2mm around edges, or a misaligned window tilting downwards.

• Clean and lubricate: Wipe tracks and hinges with a soft cloth. Apply silicone spray (not WD-40, which attracts dirt) to moving parts. Test if it now closes smoothly.

• Check for obstructions: Remove any debris, old sealant, or insect nests in the frame. Ensure handles turn fully without grinding.

• Test adjacent windows: If others close fine, the issue is isolated. Note any unusual noises like scraping, which points to window catching on frame.

These steps resolve minor issues 20-30% of the time. If not, professional help prevents costly escalation. View our full list of common window symptoms for comparison.

Likely Fixes

Most window won’t close problems stem from our core uPVC services. Use this decision guide to identify yours—our local Sutton team can confirm on-site.

• Hinges feel loose or the sash has dropped? Likely worn friction stays. Book a window hinge friction stay replacement to restore smooth operation.

• Window tilts or won’t align evenly in the frame? This calls for toe and heel service, adjusting pivot points for perfect balance.

• Closes but leaves gaps, rattles, or feels draughty? Seals and alignment need attention. Opt for window draught proofing alignment to seal tight.

• Handle turns but won’t latch fully? Could be keepers or strikers misaligned—often fixed during the above adjustments.

• Still catching despite cleaning? Frame distortion might require a full window adjustment inspection.

We don’t handle sash, sliding, tilt-and-turn, inward opening, or wooden windows—these need specialists. Contact us for a precise diagnosis tailored to your uPVC setup.

FAQs

Why won’t my uPVC window close after years of use?

uPVC windows last decades, but hinges and seals degrade from repeated opening. Regular window adjustment prevents this, but fixes are straightforward.

Can I fix a window that won’t latch myself?

Basic lubrication helps, but faulty mechanisms risk breaking further. Professional window repair ensures security compliance.

How much does window hinge replacement cost?

Costs vary by window size and access, but we provide quotes after inspection—no surprises. It’s often cheaper than full replacement.

Does misalignment cause draughts if the window won’t shut properly?

Yes, gaps let cold air in. Our draught proofing service addresses both window won’t close and insulation issues.

What if my window catches on the frame when closing?

This indicates a dropped sash or worn seals. Toe-and-heel adjustments realign it quickly.

Are your technicians qualified for local Sutton homes?

With 10+ years experience, liability insurance, and DBS checks, we’re trusted for uPVC work across Sutton.

Call To Action

Don’t let a window won’t close issue compromise your home—draughts, noise, and vulnerability add up fast. Contact Window Repairs Sutton today for a no-obligation inspection by our insured, local experts.

Call 020 8138 0796 or email [email protected]. We focus on efficient uPVC fixes like hinge replacement, alignment, and draught proofing to get you shutting smoothly again.