Transform your draughty, noisy casement windows into high-performance energy savers with secondary glazing. Ideal for preserving original casement windows in Victorian, Georgian, and Edwardian properties. Whether you own a charming 1930s Art Deco property with original steel casements or a modern home with underperforming uPVC windows, secondary glazing delivers 45-60% energy bill reductions, 70-80% noise reduction, and preserves your original windows perfectly.
Trusted by London period property owners | Specialists in heritage and modern casement windows | Works with metal, timber, and uPVC casements | Full access to primary windows maintained. Perfect for listed buildings and conservation areas.
Hundreds of Victorian, Georgian, Edwardian, and Art Deco homes transformed across London
Why Casement Windows Desperately Need Secondary Glazing
Casement windows present unique challenges that make secondary glazing not just beneficial, but often essential for comfortable living.
Period Metal Casements (1920s-1950s Properties)
Original steel casements found in Art Deco properties, inter-war suburban homes, and 1930s-1950s semi-detached houses face specific problems:
- •Single-glazed construction creates massive heat loss - you're essentially heating the outdoors
- •Rust and deterioration is common, especially around hinges and frames
- •Draughty hinged mechanisms create gaps that whistle with wind and leak heat constantly
- •Difficult operation due to seized hinges, paint buildup, and warped frames
- •Expensive like-for-like replacement often costs £800-£1,500 per window for specialist heritage metalwork
- •Character loss if replaced with modern uPVC destroys the period charm completely
Timber Casement Windows
Traditional timber casements suffer from:
- •Single-glazed construction in older properties (poor thermal performance)
- •Shrinking and swelling timber creates seasonal draughts and operation issues
- •Ongoing paint maintenance requirements and weather damage
- •High replacement costs (£800-£1,500 per window for quality timber casements)
Modern uPVC and Timber Casements
Even newer casement windows often underperform:
- •Builder-grade double glazing uses cheap units with poor performance
- •Insufficient for noisy environments - standard double glazing can't handle flight paths, railways, or busy London roads
- •Heat loss through frames and aging seals reduces efficiency over time
The Impact on London Homeowners
These casement window problems create real daily struggles:
Guilt about replacement - knowing that removing original casements destroys period character
Cost paralysis - replacement seems too expensive, but current situation is unbearable
Why Secondary Glazing is the Perfect Solution
Secondary glazing solves every casement window problem elegantly:
Comprehensive Benefits That Transform Your Home
Energy Efficiency & Dramatic Cost Savings
Superior thermal performance creates an insulating air gap that transforms casement window thermal performance:
Noise Reduction & Acoustic Transformation
Excellent acoustic insulation for urban properties - the hinged gaps in casement windows are notorious for letting noise through:
Heritage Preservation & Period Property Perfect
Enhanced Security & Safety
Enhanced security features add protection to casement windows:
Full Access to Primary Windows Maintained
This critical advantage sets quality secondary glazing apart:
Casement Window Secondary Glazing Options
Hinged Secondary Glazing
Mirrors your casement window operation for natural use:
Side-Hinged Units
- Open sideways just like your casement window
- Full access to primary window handles and operation
- Smooth engineered hinged mechanism
- Can be color-matched to existing window frames
- Perfect for regularly-opened casements
- Most versatile and popular option
Top-Hinged Units
- Hinges at the top, opens outward into the room
- Ideal where side clearance space is limited
- Good ventilation option when opened
- Less common but useful for specific room layouts
Lift-Out Panels (Flexible & Cost-Effective)
Completely removable secondary glazing:
Popular for: Guest bedrooms, spare rooms, upper floor casements opened infrequently
Fixed Secondary Glazing (Maximum Performance)
Non-opening units for best thermal and acoustic results:
Popular for: Front-facing rooms (noise priority), rarely-used rooms, deteriorated casements
Tilt & Turn Compatible Solutions
Specialized secondary glazing for tilt & turn casement windows:
Glass Specifications for Every Situation
Understanding air gap sizing is critical for casement installations. Choose the right glass thickness for your specific acoustic insulation and thermal performance needs. Read our complete guide to secondary glazing costs for detailed pricing.
4mm
Quiet suburban streets, mainly thermal benefit for single-glazed metal casements
6.4mm-6.8mm
Moderate urban noise, excellent all-rounder for most casement installations, balances cost and performance perfectly
8.8mm-10.8mm
Heavy traffic areas, railway lines, busy London environments, ideal for front-facing casements
10.8mm-12.8mm
Extreme noise situations - airports, major railways, motorways, maximum acoustic performance
Recommendation Guide
Professional Installation Process
7-Step Process for Perfect Results
Initial Consultation
Free home visit to assess your casement windows, discuss your specific requirements, examine hinged mechanisms, and consider any heritage factors
Detailed Survey
Precise measurement of each casement window, assessment of opening mechanisms, evaluation of available depth for secondary glazing, identification of any obstructions (handles, stays, locks)
Specification & Quotation
Recommendation of optimal secondary glazing style (hinged/lift-out/fixed), appropriate glass specification, frame color options, complete cost breakdown, expected performance improvements
Custom Manufacturing
Each unit custom-made to your exact casement measurements, hinged mechanisms engineered for smooth operation, typical manufacturing time 4-6 weeks
Professional Installation
Expert installation team, 2-3 hours per casement window, discreet fixings into window reveals, full adjustment and testing, demonstration of operation, minimal mess and disruption
Quality Assurance
Testing all units thoroughly, demonstration of hinged operation, verification of access to primary casements, checking locking systems and cleaning access, any final adjustments needed
Comprehensive Aftercare
Full warranty coverage, detailed care instructions, maintenance guidance, ongoing support whenever needed
Investment & Cost Breakdown
Typical Costs Per Casement Window
Whole House Investment Examples
Compare to Casement Replacement Costs
Return on Investment
Real London Case Studies
1930s Art Deco Semi, Ealing
Challenge:
Original steel casements rusting and extremely draughty, single-glazed throughout, cold bedrooms, high energy bills, but beautiful character property that needed original windows preserved.
Solution:
8 hinged secondary glazing units with 6.8mm acoustic glass to match the Art Deco aesthetic perfectly.
Results:
"The steel casements are an integral part of the character of our 1930s home. Secondary glazing saved them and completely transformed our comfort. The house is warm and quiet now, and the original windows are properly protected."
1950s Semi-Detached, Croydon
Challenge:
Metal casements severely deteriorated, difficult to open properly, extremely draughty, cold rooms throughout winter, seriously considering expensive total replacement.
Solution:
10 fixed secondary glazing units (casements were rarely opened anyway due to deterioration), 6.8mm glass specification.
Results:
"We never opened most of the casements anyway because they were so deteriorated. Fixed secondary glazing was the perfect solution - affordable, incredibly effective, and protects our original windows."
Modern Home, Richmond
Challenge:
Builder-grade double glazed uPVC casements, severe flight path noise from Heathrow approaches, disrupted sleep, work from home challenges with constant aircraft noise.
Solution:
6 hinged secondary glazing units in bedrooms and home office, 10.8mm high-performance acoustic glass for maximum noise reduction.
Results:
"We thought our double glazing was sufficient. Secondary glazing made an absolutely incredible difference for the flight path noise. We're finally sleeping through the night again."
Secondary Glazing vs Alternatives Comparison
| Factor | Secondary Glazing | Casement Replacement | DIY Plastic Film |
|---|---|---|---|
| Cost per window | £350-£800 | £800-£1,500 | £20-£50 |
| Heritage preservation | Preserves originals perfectly | Destroys period casements | Temporary, poor appearance |
| Character retention | Maintains complete period charm | Often loses character | Looks cheap and temporary |
| Installation time | 2-3 hours per window | Full day+ per window | 1 hour per window |
| Disruption level | Minimal mess | Major (removal, making good) | Minimal |
| Reversibility | Completely reversible | No (originals destroyed) | Yes but temporary |
| Exterior appearance | Unchanged from street | Altered building appearance | Visible, poor quality |
| Performance | Excellent (45-60% energy, 70-80% noise) | Excellent but much costlier | Poor (<10% improvement) |
| Durability | 20+ years | 20+ years | 1-2 years maximum |
Cost per window
£350-£800
£800-£1,500
£20-£50
Heritage preservation
Preserves originals perfectly
Destroys period casements
Temporary, poor appearance
Character retention
Maintains complete period charm
Often loses character
Looks cheap and temporary
Installation time
2-3 hours per window
Full day+ per window
1 hour per window
Disruption level
Minimal mess
Major (removal, making good)
Minimal
Reversibility
Completely reversible
No (originals destroyed)
Yes but temporary
Exterior appearance
Unchanged from street
Altered building appearance
Visible, poor quality
Performance
Excellent (45-60% energy, 70-80% noise)
Excellent but much costlier
Poor (<10% improvement)
Durability
20+ years
20+ years
1-2 years maximum
Clear Winner for Period Casements: Secondary glazing delivers the best combination of heritage preservation, excellent performance, and value for money.
Frequently Asked Questions
Ready to Transform Your Casement Windows?
Ready to transform your draughty, noisy casement windows into high-performance energy savers? Get your free home assessment today and discover exactly how much you could save with casement window secondary glazing tailored to your London property.