Expert Secondary Glazing Repair Services London
When your secondary glazing starts playing up, you don't always need a complete replacement. Our expert repair services across London cover everything from spiral balance failures to cracked glass, handling all major brands including Selectaglaze, Anglian, Storm, and custom installations.
Understanding Common Secondary Glazing Repairs
Most secondary glazing issues can be repaired quickly and cost-effectively without replacing the entire unit. Here are the most common problems we encounter:
Spiral Balance Failures
CommonThe most common issue, especially in vertical sliding units. When that familiar 'thunk' of a sash dropping suddenly happens, or you struggle to lift a window that used to glide effortlessly, your spiral balance springs have likely given up after 10-15 years of service.
Hinge Problems
CommonPlagues side-hung secondary glazing, particularly in bay windows where friction stay hinges bear more weight. If your window won't stay open at the angle you set, sags when opened, or makes grinding noises, the hinges need attention.
Lock & Handle Issues
SecurityCreates both inconvenience and security concerns. A lock that won't engage properly or a loose handle aren't just annoying – they compromise your home's security.
Seal Deterioration
PerformanceMight seem minor, but those brush seals and compression gaskets around your frame edges are crucial for thermal and acoustic performance. When you start feeling draughts or notice increased outside noise, degraded seals are often the culprit.
Glass Damage
UrgentFrom accidental impacts or gradual deterioration requires immediate attention, not just for aesthetics but for maintaining your secondary glazing's insulation properties.
Signs You Need Secondary Glazing Repairs
Early detection of problems can prevent more costly repairs. Here are the warning signs to watch for:
Spiral Balance Warning Signs
- Sash drops suddenly when released (urgent – window becomes unusable)
- Requires significant force to lift the window
- Sash slides down slowly when positioned mid-height
- Uneven operation where one side sticks
- Creaking or squeaking during operation
- Visible damage to balance rods or housing
Hinge Issues to Watch For
- Windows won't stay open at set angles
- Panels sag when opened
- Grinding or squeaking noises
- Windows don't close flush with the frame
- Visible rust or corrosion on hinges
Lock and Handle Problems
- Locks won't engage properly
- Handles feel loose or wobble
- Keys won't turn smoothly
- Difficulty unlocking windows
Seal Deterioration Symptoms
- Noticeable draughts around window edges
- Increased outside noise penetration
- Visible gaps where you can see daylight
- Brush seals appear flattened or missing bristles
- Condensation forming around frame edges
Repair Cost Guidance
Our transparent pricing means no nasty surprises. All prices include parts, labour, and testing.
Spiral Balance Replacement
£85-£150Includes quality spring mechanism, removal of old balance, installation, and testing
Hinge Repairs
£60-£95Friction stay replacement for side-hung units. Specialized hinges for top/bottom-hung windows: £70-£110
Lock & Handle Services
£35-£120Lock replacement £45-£75, handles £35-£55, security upgrade locks £75-£120
Seal Replacement
£50-£100Brush seals or compression gaskets £50-£85, full perimeter sealing £65-£100
Glass Replacement
£95-£280Standard 4mm glass £95-£150, acoustic 6.4mm laminate £150-£250, premium 6.8mm acoustic £280
Frame Repairs
£85-£200Realignment £85-£140, frame section replacement £120-£200
Service Call-Out Fee
£75-£95
Covers assessment, quotation, and travel within London's M25. This cost is spread across multiple windows when we're repairing several units in one visit.
Repair vs Replacement
Save 70-80%
Single component repairs typically cost 70-80% less than new installation. A spiral balance replacement at £160-£245 total beats a new unit at £400-£750 when the frame and glass remain sound.
Our 5-Step Repair Process
We've refined our repair process to be efficient, transparent, and minimally disruptive to your home.
Contact & Booking
Call, email, or WhatsApp us with your issue description. We'll ask diagnostic questions and can often provide cost estimates over the phone.
Standard appointments book 5-7 days ahead, with priority (2-3 days, £25 surcharge) and emergency same-day service (£50 surcharge) available.
On-Site Assessment
30-45 minutesOur technician inspects your secondary glazing thoroughly, diagnoses the exact problem, and provides a fixed-price quote with no hidden costs.
We'll discuss repair versus replacement options and answer all your questions.
Repair Work
30-70 minutes per windowOnce approved, we protect surrounding areas and complete the repair. Most common parts are carried in stock, allowing same-visit completion.
Specialized parts requiring ordering mean a return visit at no extra call-out charge.
Testing & Demonstration
We thoroughly test the repaired window's operation and demonstrate proper use.
You'll receive maintenance advice and warranty information.
Completion & Follow-up
Area cleanup, detailed invoice, and flexible payment options.
We follow up 1-2 weeks later to ensure everything's working perfectly.
Brands We Repair
We service all major secondary glazing brands and systems with expert knowledge and genuine parts.
Selectaglaze
Market leader – we stock standard parts
Anglian Windows
Secondary glazing systems
Storm Windows
All system types
Everest
Secondary glazing
Custom & Bespoke
Installations
Unbranded Systems
From local installers
Universal Parts Compatibility
Our universal parts compatibility covers 95% of secondary glazing systems regardless of age or manufacturer. Where manufacturer-specific parts are needed, we source them within 2-7 days.
Emergency & Priority Services
We understand that some repairs can't wait. Choose the service level that matches your needs.
Same-Day Emergency
£50 surchargeAvailable for genuine emergencies like broken glass, lock failures, or suddenly dropped sashes that render windows unusable.
Call before 12pm for London M25 availability
Next-Day Priority
£25 surchargeBetter availability than same-day service. Ideal when you need quick but not immediate attention.
Call before 2pm for next-day scheduling
Standard Service
No surchargeBest value option with no surcharge beyond standard call-out fee. Perfect for non-urgent repairs.
5-7 days booking window
Temporary Fixes Available
When immediate repair isn't possible – boarding for broken glass, security wedges for failed locks, and props for dropped sashes.
Heritage Property Considerations
Good News for Listed Buildings
Like-for-like repairs typically don't require listed building consent. Spiral balance replacement, hinge repairs, and glass replacement with the same specifications are considered maintenance rather than alterations.
- Like-for-like repairs typically don't require listed building consent
- Spiral balance replacement considered maintenance, not alteration
- Hinge repairs and glass replacement with same specifications permitted
- Conservation-friendly approach maintains reversibility
- Matches existing components exactly
- Uses heritage-appropriate colors
Real Repair Success Stories
See how we've helped London homeowners restore their secondary glazing at a fraction of replacement cost.
Victorian Kensington – Spiral Balance Rescue
Six vertical sliding windows with sudden spiral balance failure left the sashes dropping dangerously.
£720
Total Cost
2.5 hours
Duration
Savings
Georgian Belgravia Bay Window Revival
Three bay window panels with failed friction stays wouldn't hold open positions.
£270
Total Cost
1.5 hours
Duration
Savings
Art Deco Hampstead Glass & Seal Upgrade
Accidental damage plus deteriorated seals affecting thermal and acoustic performance.
£295
Total Cost
2 hours
Duration
Savings
Preventing Future Repairs
Proper maintenance extends spiral balance life to 15+ years and keeps all components operating smoothly.
Annual Maintenance Service
£120-£180 per property
Our comprehensive service lubricates all mechanisms, cleans tracks and seals, tests operation, and catches wear before it becomes expensive repairs.
Book Maintenance ServiceDIY Maintenance Tips
- Lubricate hinges and tracks every 6 months with silicone spray
- Vacuum brush seals quarterly to remove debris
- Wipe glass and frames monthly
- Test locks and handles regularly
- Never force stuck windows – investigate the cause
Frequently Asked Questions
Get Your Secondary Glazing Working Again
Don't let faulty secondary glazing compromise your comfort, security, or energy efficiency. Our expert repair services across London provide cost-effective solutions with transparent pricing and reliable warranties.