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WINDOW OPENING FAULTS

Window Won’t Open

A window that will not open may be locked, painted shut, swollen, misaligned or affected by a failed handle, hinge or gearbox.

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Avoid forcing the sash or levering near glass

Large, high-level and emergency escape windows can be hazardous. Support heavy sashes and stop if the frame, glass or locking mechanism is under stress.

MOST LIKELY CAUSES

Start with locks, hinges and alignment

Lock still engaged The handle moves but the locking points remain secured.
Paint or sealant build-up Layers bridge the sash and frame.
Swollen timber Moisture causes wooden sections to expand.
Failed mechanism The handle, spindle, hinge or gearbox no longer operates correctly.
◫ Symptom variations Match the opening, closing or support fault. ⌄
  • Handle moves but window stays shut
  • Window opens at one corner only
  • Timber window is worse after rain
  • Paint line appears unbroken
  • Handle feels loose or spins
✓ Quick checks Safe checks before dismantling hardware. ⌄
  1. Confirm every lock and restrictor is released.
  2. Inspect the perimeter for paint or sealant bridging.
  3. Try gentle pressure at different corners without forcing glass.
  4. Check whether the handle spindle engages.
  5. Look for visible hinge distortion.
Important: Test gently and support the sash. Excess force can twist the frame or crack glazing.
1 Step 1 — Release obvious obstructions Make the smallest safe correction and retest. ⌄

Cut paint lines carefully and remove visible debris.

2 Step 2 — Separate alignment from mechanism faults Make the smallest safe correction and retest. ⌄

Observe which corners move when the handle is operated.

3 Step 3 — Repair the failed component Make the smallest safe correction and retest. ⌄

Adjust hinges or replace worn handle, spindle or gearbox as needed.

⌁ Why the problem happens How locks, hinges, balances and frames affect movement. ⌄

Windows rely on several contact points moving together. Small alignment changes, swollen material or one failed locking point can hold the whole sash shut.

⌘ Advanced checks Further diagnosis for persistent window faults. ⌄
  1. Check multipoint locking movement.
  2. Inspect friction hinges for distortion.
  3. Assess timber moisture and paint condition.
  4. Check frame squareness.
  5. Identify concealed restrictors or safety catches.
◇ Tools and information needed Useful items for accurate checks. ⌄
  • Plastic scraper
  • Utility knife used carefully
  • Screwdrivers
  • Torch
  • Manufacturer information
▣ Parts that may need replacing Common hardware linked to this fault. ⌄
  • Window handle
  • Spindle
  • Gearbox or espagnolette
  • Friction hinges
  • Weather seals
! When to call a professional Conditions that should end basic DIY diagnosis. ⌄
  • The window is an emergency escape window.
  • The glass or frame is under stress.
  • The sash is large or above ground level.
  • A multipoint lock has failed shut.
  • Force would be needed near glazing.
? Frequently asked questions Common window opening questions. ⌄

Can I lever the window open?

Avoid metal levering near glass or plastic frames. It can crack glazing and damage seals.

Why is it worse after rain?

Timber may have swollen or seals may be sticking.

What if the handle spins?

The spindle, handle or gearbox may have failed.