Business Details
50+ Years
experience
Trusted Secondary Glazing Services in London
City Sound has been a trusted name in secondary glazing since 1968, serving residential and commercial clients across London and the M25. Founded by Derrick Smith and now led by his son Andrew, our family-run business combines over five decades of expertise with a commitment to quality and customer service. We specialize in bespoke secondary glazing solutions that reduce noise, improve thermal insulation, and preserve the aesthetic integrity of listed buildings.Our team of skilled professionals delivers tailored installations, backed by a 12-year guarantee, ensuring long-term reliability. With a focus on sustainability and innovation, we manufacture durable aluminium frames and offer trade clients a 40% discount. Our reputation for excellence is reflected in our 4.9 Google rating from 119 reviews, underscoring our dedication to meeting the unique needs of every client.
Services
Secondary Glazing
Noise Reduction
Thermal Insulation
Listed Buildings
Commercial Projects
Details
- Year established: 1968
Highlights and features
- 50+ years of specialist experience in secondary glazing
- Family-run business with generational expertise and integrity
- 12-year guarantee on all workmanship and materials
- 40% trade discount for supply-only clients
- Bespoke solutions for listed buildings and modern properties
What people say
Excellent noise reduction
Professional installation team
Preserved historic windows
Highly recommend
Competitive pricing
Services
Secondary Glazing
Secondary glazing involves installing an independent internal window to reduce noise and improve thermal efficiency. Our aluminium systems create a discreet, durable barrier that preserves original window aesthetics while enhancing comfort. Ideal for listed buildings and modern properties, this solution cuts heating costs and blocks external pollutants.
Thermal Insulation
Our secondary glazing units improve thermal performance by over 60%, reducing heat loss through single-glazed windows. By creating an insulating air gap, we help lower energy bills and carbon emissions while maintaining the architectural integrity of historic properties.
Listed Buildings
We specialize in secondary glazing for protected properties, offering reversible solutions that meet conservation requirements. Our slim aluminium frames mirror original window designs, ensuring compliance with Listed Building Consent while delivering modern performance benefits.
Commercial Projects
From hotels to office refurbishments, our commercial secondary glazing enhances acoustic privacy and energy efficiency. We collaborate with architects and contractors to deliver large-scale installations that meet project specifications, with samples and technical support available.
Trade Supply
City Sound offers trade clients a 40% discount on supply-only secondary glazing units. Our high-volume manufacturing ensures competitive pricing without compromising quality, making us London's leading trade supplier for bespoke aluminium glazing systems.
People
Derrick Smith
Founder
Derrick Smith founded City Sound in 1968, pioneering secondary glazing solutions for London's historic buildings. With a vision for non-invasive acoustic and thermal improvements, he established the company's reputation for craftsmanship and reliability before passing leadership to his son Andrew.
Andrew Smith
Managing Director
Andrew Smith has led City Sound since 2009, building on his father's legacy with expanded expertise in commercial projects and sustainable materials. He oversees operations with a focus on innovation, client satisfaction, and maintaining the family's commitment to quality in every installation.
Questions
What is secondary glazing?
Secondary glazing involves installing an independent internal window to improve noise reduction and thermal efficiency without altering existing windows.
How does secondary glazing reduce noise?
A sealed air gap between primary and secondary windows disrupts sound waves, achieving up to 30% greater noise reduction than double glazing.
Is secondary glazing suitable for listed buildings?
Yes, our reversible systems meet conservation requirements while preserving original window aesthetics and historic integrity.
What materials do you use?
We use durable powder-coated aluminium frames for slim, discreet designs, avoiding less effective materials like uPVC or timber.
Do you offer guarantees?
All installations include a 12-year guarantee covering materials and workmanship, reflecting our confidence in long-term performance.
Can secondary glazing reduce energy bills?
Yes, improved thermal insulation can cut heating costs by up to 60%, enhancing energy efficiency in older properties.
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