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4.3/5 from 27+ reviews

Condensation Between Panes

Sealed units for windows with condensation trapped between the glass. Internal condensation means the seal has failed — the unit needs replacing. We manufacture exact-size replacements with improved specifications to prevent recurrence. Same-week dispatch on standard sizes.
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FENSA Registered
BS EN 1279 Certified
Nationwide Delivery
Same-Week Dispatch
4.3/5 rating from 27+ reviews
Trade Pricing Available

Condensation between panes is a sealed unit problem. Condensation on the room side is a specification problem. We supply units that fix both.

Expert Glazing, Done Right

We're not a national call centre. We're local glaziers who take pride in every job.

Warmer Glass Surface

Low-E coated units keep the inner pane warmer, dramatically reducing room-side condensation. A Low-E + argon unit typically keeps the inner surface above the dew point even in cold weather.

Higher Specification Options

Step up from the failed unit's original spec: Low-E softcoat, argon or krypton gas fill, warm-edge spacer bars. Each improvement compounds — a triple upgrade can halve the U-value.

Exact-Size Replacements

Manufactured to your measurements with tight tolerances. Clean installation into existing beads without frame modification.

Fast Turnaround

Standard sizes dispatched same-week. Get the condensation problem solved quickly — your customer is tired of looking at foggy glass.

10-Year Warranty

Every unit warranted against seal failure and gas loss for 10 years. If condensation returns between the panes within warranty, we replace it free.

Not all condensation is a sealed unit failure. Here's how to identify the problem and recommend the right solution.

Signs Your Double Glazing Needs Attention

Catching problems early saves money and prevents bigger issues. Here are the telltale signs your windows need professional attention.

⚠️ Noticed any of these issues? Do not wait - small problems become expensive repairs. Get a free assessment today.

Expert Knowledge

Condensation: Understanding the Problem, Specifying the Solution

The Physics of Window Condensation

Condensation forms when warm, moisture-laden air contacts a surface below its dew point. In double glazing, the inner pane temperature is the critical factor. Old clear glass units (U-value ~2.8 W/m²K) allow the inner pane to get cold enough for condensation in normal living conditions. Modern Low-E units (U-value ~1.1 W/m²K) keep the inner pane significantly warmer.

Between-Pane Condensation: Seal Failure

When condensation appears between the panes, the seal has failed. The desiccant in the spacer bar has absorbed moisture until saturation. The insulating gas has escaped. The unit now performs little better than single glazing. Replacement is the only solution.

Specifying the Replacement

A condensation replacement is the perfect opportunity to upgrade. The most impactful upgrades:

Low-E softcoat glass — reflects long-wave heat radiation back into the room. Keeps the inner pane surface 5-8°C warmer than clear glass in winter. This alone eliminates most room-side condensation.

Argon gas fill — reduces convection within the cavity. Improves U-value by approximately 0.3 W/m²K over air fill. Combined with Low-E, delivers U-values from 1.1 W/m²K.

Warm-edge spacer bars — reduce thermal bridging at the glass perimeter. Standard aluminium spacer bars create a cold path at the edge of the glass where condensation often forms first. Warm-edge spacers (composite or stainless steel) virtually eliminate edge condensation.

Ventilation Advice for Customers

Even the best glass specification can't overcome extreme humidity. When replacing condensation-affected units, advise your customers on ventilation: trickle vents, extractor fans in kitchens and bathrooms, and regular brief window-opening all help maintain healthy humidity levels. A hygrometer reading above 60% relative humidity will cause condensation on almost any glass specification.

If condensation typically appears at the edges of the glass first, the spacer bar is the thermal weak point. Upgrading from standard aluminium to a warm-edge spacer (Superspacer, TGI, or similar) reduces perimeter heat loss by up to 65% and virtually eliminates edge condensation. It's a modest cost upgrade with a visible result your customer will notice.

Measure, specify, order. We handle the manufacturing and delivery — you handle the installation.

How Our Service Works

From first contact to finished job, we make the whole process straightforward and stress-free.

Assess the Window

Determine whether condensation is between the panes (seal failure) or on the room side (specification issue). Measure the unit: width, height, overall thickness. Note glass type and spacer type.

Choose the Upgrade

We'll quote like-for-like and upgraded specifications so you can present options. Low-E + argon + warm-edge spacer is the gold standard for condensation prevention.

Order

Via trade portal, email, or phone. We confirm and quote within the hour. Trade accounts get 30-day terms and volume pricing.

Fit & Advise

We deliver; you fit. Provide your customer with ventilation advice to complement the new glass specification — this reduces callbacks and demonstrates expertise.
From basic replacement to premium anti-condensation specifications — every unit manufactured to order.

What We Can Help With

From quick repairs to complete replacements, we handle all residential and commercial glazing needs.

Low-E + Argon Units

The standard upgrade for condensation-affected windows. Softcoat Low-E glass with argon gas fill and warm-edge spacer. U-values from 1.1 W/m²K.

Triple Glazed Upgrade

For severe condensation or north-facing windows. Triple glazed units deliver U-values from 0.6 W/m²K — virtually eliminating any condensation risk.

Like-for-Like Replacement

Match the original specification exactly. Clear glass, air fill, aluminium spacer. The budget option when the customer just wants clear glass again.

Obscure & Privacy

Condensation-affected bathroom and privacy windows. Obscure glass with Low-E coating — solve the condensation and maintain privacy in one replacement.

Warm-Edge Spacer Bars

Specify warm-edge spacers on any unit to eliminate edge condensation. Superspacer, TGI, Chromatech, or Thermix — we work with all major systems.

Toughened Low-E

Safety glass with Low-E performance for low-level glazing, doors, and overhead panels where both condensation resistance and safety compliance are needed.

Not sure what you need? No problem - we will assess and advise. No obligation, no pressure.

Trusted by Tradespeople & Homeowners

What Our Customers Say

4.3 ★ from 27 Google reviews

  • 15+

    Years in Business

  • 10,000+

    Sealed Units Supplied

  • 27+

    Google reviews

  • ★★★★★
    Huge shout-out to Ollie and the team! ⭐⭐⭐⭐⭐ ​Our patio door went from being completely stuck and impossible to lock to sliding like a dream. Ollie diagnosed the issue (collapsed wheels) and his team squeezed us in despite a packed schedule. ​The difference is night and day—it literally feels like it’s sliding on air now. If you’re looking for reliable, expert servi...

    Susan Passmore

  • ★★★★★
    We had glass panes and hinges replaced throughout the house and a new set of french doors. Ollie and everyone that came to fit were friendly, professional, tidy and considerate. The work has been carried out to excellent quality - especially the french doors which look fantastic.

    Lucy Bennett

  • ★★★★
    Complex issue with a broken non-standard hinge on 1st floor window. Ollie was the only one of over 10 other firms I contacted who said they could do the job. It took a while, but Ollie managed to source a replacement part and completed the job to a high standard. Very happy with the work done and have asked him to do another job following the good experience.

    Dave Edwards

Technical answers for trade professionals dealing with condensation problems.

Frequently Asked Questions

Everything you need to know about our double glazing repair and replacement services across the South West.

  • In most cases, yes. Low-E glass keeps the inner pane surface 5-8°C warmer than clear glass, typically above the dew point in normal living conditions. However, exceptionally high humidity (above 60% RH) can still cause condensation on any glass. Ventilation advice is essential.

  • Low-E softcoat + argon fill + warm-edge spacer is the gold standard. This combination delivers U-values around 1.1 W/m²K and virtually eliminates both room-side and edge condensation in normal conditions.

  • No. External condensation on the outer surface of Low-E glass is normal and expected — it's actually proof that the glass is working. The outer pane stays cool because heat is reflected back into the room. It clears once the sun warms the glass.

  • You can, but consider quoting for all units of similar age. If one unit has failed, adjacent units are likely approaching end-of-life too. Replacing all at once saves your customer multiple callout fees and disruption.

  • Yes. Warm-edge spacers are available on any sealed unit we manufacture. Options include Superspacer, TGI, Chromatech Ultra, and Thermix — all reduce perimeter heat loss by up to 65% compared to standard aluminium spacers.

  • Typically £15-25 per unit over basic clear glass, depending on size. It's one of the most cost-effective upgrades in glazing — modest extra cost for a substantial performance improvement.

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Order Condensation Replacement Glass

Get your free, no-obligation quote today. Most quotes delivered within 24 hours.

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