London soundproofing FAQs

Question 1

How much noise can soundproof windows reduce?

Accepted Answer

Our specialist acoustic secondary glazing is specified for up to 54dB noise reduction using 10.8mm Stadip Silence glass. This is an upper performance claim, not a guaranteed drop in the sound level in every room. The complete window arrangement, air gap, seals, noise frequencies and other routes into your home determine the installed result. Ask at your survey for the test evidence relevant to your proposed specification.

Question 2

What does a noise reduction figure in dB actually mean?

Accepted Answer

Decibels use a logarithmic scale, so a dB figure is not a percentage of noise removed. A laboratory sound-insulation rating describes a tested construction; it is not the same as measuring the change in your room before and after installation. STC and Rw ratings also use different methods. Compare like-for-like test data and ask about low-frequency performance for buses, lorries and aircraft.

Question 3

Will secondary glazing stop London traffic and aircraft noise?

Accepted Answer

It can reduce noise passing through the window, including road traffic and aircraft noise, but no window system guarantees complete silence. Homes beside busy roads in Camden or under flight paths around Richmond may need different specifications. We assess the dominant noise source and check vents, gaps and other noise paths before recommending glass and a panel layout.

Question 4

Is thicker acoustic glass always better?

Accepted Answer

No. The acoustic interlayer, glass combination, air gap and frame seals matter alongside thickness. Options include 6.4mm, 8.8mm and 10.8mm acoustic laminated glass, subject to panel weight and frame capacity. Ordinary laminated or toughened glass should not be assumed to perform like an acoustic laminate.

Question 5

How long does soundproof window installation take?

Accepted Answer

There is no fixed fitting time for every London home. The number and size of windows, opening style, access, condition of the existing windows and any heritage detailing affect the schedule. We confirm the expected fitting duration for your project after the survey. Survey appointments, made-to-measure manufacturing and fitting are separate stages; ask for both the manufacturing lead time and the time installers will be in your home before booking.

Question 6

Do my existing windows need to be removed?

Accepted Answer

Not normally for secondary glazing. A separate glazed frame is fitted on the inside of your existing window, keeping the original external window in place. The survey checks reveal depth, fixing positions and the condition of the existing joinery; repairs may be needed before fitting.

Question 7

Can I still open, clean and ventilate my windows?

Accepted Answer

Sliding, hinged and lift-out secondary panels offer different types of access to the original window. We agree the layout around handles, curtains and blinds, and check ventilation and any emergency escape requirements. Do not permanently block required ventilation to improve noise reduction.

Question 8

What should I prepare before installation?

Accepted Answer

Agree access, parking and any building-management requirements with your installer. Clear the area around the windows and discuss whether blinds or curtains need to be moved. Your written installation arrangements should set out any preparation or repairs needed and how the room will be protected during fitting.

Question 9

Can heritage sash windows be soundproofed without replacing them?

Accepted Answer

Yes, where the building and window layout allow it. Internal secondary glazing can retain the original sash or casement window and its external appearance. Slim frames, suitable finishes and carefully aligned panels help limit the visual impact in Georgian and Victorian homes. We check the existing joinery, reveal depth and access before recommending a design.

Question 10

Can secondary glazing be fitted in a Grade II listed home?

Accepted Answer

It can be an option, but suitability and permission must be checked for the individual building. Internal work can still affect a listed building's special interest, so secondary glazing is not automatically exempt from listed building consent. Contact your borough's conservation team before work begins and refer to Historic England's guidance on modifying historic windows.

Question 11

Do I need permission in a London conservation area or flat?

Accepted Answer

Requirements depend on the building, the proposed work and local restrictions. Check with your borough planning team, especially where an Article 4 direction applies or the property is listed. Leaseholders should also check their lease and obtain any required freeholder or managing-agent approval. Do not assume an internal installation removes every permission requirement.

Question 12

How do I get a quote for my London home?

Accepted Answer

Send your postcode, window type, approximate number of windows and the noise that bothers you most. Photos are useful for discussing sash, bay and heritage layouts. Our pricing page and cost estimator provide indicative costs; a free survey confirms the specification, any permission or repair considerations and your written quotation.

London soundproofing FAQs

Noise reduction & glass

Installation & everyday use

Heritage homes & planning

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