Winter in London brings colder temperatures, heavy rain, strong winds and sudden weather changes that put enormous pressure on windows and glazing systems. From cracked panes to misted units and weakened seals, cold weather exposes existing vulnerabilities and creates new problems that can turn into emergencies if left unaddressed.
Knowing how to prepare for winter, recognise warning signs and act quickly during glazing failures can save property owners significant time, stress and repair costs. This guide explains the most common winter glazing issues in London, how to prevent them and when to call an emergency glazing specialist.
Why Winter Increases Glazing Risks
The combination of cold air outside and warm air inside causes stress on glass, frames and sealed units. London’s winter climate can fluctuate dramatically within a single day, amplifying the strain on glazing systems.
As temperatures drop, glass and frames contract. When rapidly followed by warmer conditions, this expansion and contraction cycle can cause cracks, seal failure and misting within double glazing.
Heavy rain and strong winds also create pressure against windows, especially in exposed areas such as high-rise apartments or London homes near open spaces. Older properties or those with ageing frames are particularly vulnerable to winter-related glazing issues.
How Building Movement Affects Windows in Cold Weather
London’s older buildings, especially Victorian and Edwardian properties, naturally shift during seasonal changes. Timber frames can swell, shrink or develop small gaps that affect how tightly windows close. This can lead to drafts, rattling and reduced insulation.
Over time, these movements place additional strain on the glazing itself, contributing to cracks or seal failures.
The Most Common Winter Glazing Emergencies in London
Winter brings a noticeable spike in glazing call-outs across the city. The following issues are among the most common reasons homeowners and businesses require emergency glazing services during the colder months.
Cracked or Shattered Glass
Sudden temperature changes can cause thermal stress, especially on older or thinner glass. A small crack can spread rapidly across a pane, leading to a full break.
Cracked windows are particularly dangerous in cold weather, as cold drafts enter quickly and can make entire rooms uninhabitable. This is an urgent issue for both residential and commercial properties.
Failed or Misted Double Glazing
When the seal inside a double glazed unit fails, moisture enters the cavity between the panes. Cold weather accelerates this failure, causing misting or fogging.
Misted windows are more than an aesthetic problem; they reduce energy efficiency and create cold spots. During winter, this can dramatically increase heating bills and reduce comfort.
Broken Seals and Winter Drafts
Older frames often develop gaps during cold weather. As timber contracts or uPVC stiffens, seals can detach or lose flexibility.
This results in:
• Cold air entering the home
• Heat escaping
• Increased condensation
• Reduced indoor comfort
In severe cases, the gaps may grow large enough to require emergency glazing attention.
Frame Damage from Moisture and Wind
Strong winter winds push against windows, especially on upper floors or exposed buildings. When combined with rain, moisture infiltration becomes a serious problem.
Timber frames can absorb water and swell, while metal frames can corrode if moisture enters areas where it shouldn’t.
Winter Break-Ins and Forced Entry
Unfortunately, winter creates conditions that opportunistic criminals take advantage of. Longer nights and quieter streets can increase break-in attempts that result in damaged doors, smashed windows or compromised shopfront glazing.
These situations require immediate emergency glazing to secure the property.
Prevention Tips for Property Owners in London
While winter glazing emergencies are sometimes unavoidable, many issues can be prevented with proactive maintenance and seasonal preparation. The following tips help strengthen your property before cold weather arrives.
Inspect Windows Before Winter Begins
A thorough inspection allows you to identify early signs of glazing wear. Check for:
• Cracks in the glass
• Gaps in seals or weatherstripping
• Condensation within double glazing
• Stiff hinges or locks
• Rot in timber frames
Addressing these issues early prevents more serious winter failures.
Improve Ventilation to Reduce Condensation
Winter often brings increased indoor humidity due to heating systems, showers and cooking. Poor ventilation leads to condensation on windows, which can damage frames and encourage mould.
Use extractor fans, open windows slightly when possible or install trickle vents to manage moisture.
Maintain Frames and Seals
Keeping frames in good condition helps prevent winter drafts and moisture damage.
• Clean seals regularly
• Apply silicone sealant where gaps appear
• Treat or repaint timber frames to protect against moisture
Proper maintenance extends the lifespan of your windows and significantly reduces emergency call-outs.
Use Thermal Curtains or Window Films
Thermal curtains help retain heat inside your home and reduce stress on old windows. Window insulation film can also provide temporary improvement for older glazing that is not yet ready to be replaced.
What to Do During a Winter Glazing Emergency
If a window breaks or fails suddenly during winter, taking the right steps ensures safety and prevents additional damage.
Step 1: Prioritise Safety
Keep people and pets away from the broken area. Loose shards can fall unexpectedly, and sharp edges are dangerous.
Step 2: Reduce Heat Loss
Close doors to isolate the affected room and maintain warmth in the rest of the property. If possible, use temporary coverings to reduce drafts until a glazier arrives.
Step 3: Contact an Emergency Glazing Specialist
Winter emergencies require fast response due to cold temperatures and increased security risks. An emergency glazing team can:
• Secure the opening with boarding
• Install temporary glass
• Remove broken shards safely
• Prevent further heat loss and weather damage
• Measure for permanent replacement
Prompt action protects both the property and its occupants.
Step 4: Document the Damage
Take photos for insurance purposes, especially if the damage resulted from severe weather or attempted break-ins.
Summary of Key Insights
• Winter increases glazing risks due to temperature changes, wind and moisture
• Cracked panes, misted units and broken seals are the most common cold-weather issues
• Old or poorly maintained frames are more likely to fail in winter
• Regular inspections and maintenance prevent many winter glazing emergencies
• Improving ventilation reduces condensation and protects window frames
• Emergency glazing services secure your home quickly during winter failures
• Fast action prevents heat loss, water damage and security issues
Speak with Our Experts Today
If winter has caused glazing issues or you’re concerned about drafts, cracks or misted units, act quickly to protect your home. Contact Enter Glazing for fast, reliable emergency glazing London services and expert winter glazing support to keep your property warm, secure and safe.