A single-glazed original window with secondary glazing in front of it performs roughly equivalent to a modern double-glazed window.
Secondary glazing
Slimline secondary glazing across Sussex
Secondary glazing is a slimline interior frame fitted just inside an existing window. It dramatically improves heat retention and sound insulation without touching the original window. It is the right answer for listed buildings, conservation areas and period properties where a full replacement would be inappropriate, and it is also a strong choice for any home on a busy road. We install secondary glazing across Sussex with framework finished to match the existing reveals.
Why Brooklands
Secondary glazing has to be invisible from the street and quiet from the room - we colour-match the frame to the existing reveal as a standard.
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We have done a lot of Hove, Brighton and Lewes conservation work where the planning officer will not allow original sashes to be replaced. The frame finish is the difference between a job that disappears and a job that announces itself. We match the colour to your existing reveal, not the catalogue.
When it makes sense
When secondary glazing makes sense
Listed and conservation
Replacing original sash and casement windows is often not allowed. Secondary glazing sits behind the original and gives you the thermal and acoustic benefit without changing the building.
Period homes
The owner wants to keep the look but not the draught and the noise.
Houses near busy roads
A secondary system reduces traffic and amplified noise by up to 80 percent.
Cold rooms
Holiday lets, attic rooms, listed dormers, where full replacement is not realistic.
Not sure which is right for your job?
Send us your measurements or a sketch and we will recommend the system that suits the substrate, the spec and the budget.
Get a free quote
The systems
The systems we offer
Hinged opening units
Open inwards for ventilation and cleaning. Most popular for casement-style original windows.
Vertical sliding units
Mirror the action of an original sash window. Ideal for tall Victorian and Georgian sashes.
Horizontal sliding units
Suit wider openings and rooms where an inward-opening hinge would foul curtains.
Fixed units
The cheapest option, used where ventilation is not needed.
Acoustic units
6mm or 6.4mm laminated glass with an acoustic interlayer and brush-sealed perimeter. Used near busy roads.
Not sure which is right for your job?
Send us your measurements or a sketch and we will recommend the system that suits the substrate, the spec and the budget.
Get a free quote
Performance
How much heat and noise it saves
Standard secondary glazing reduces noise by 25 to 35 dB. Acoustic spec systems reduce by 45 dB or more. The cavity between the original and the new pane is the main lever; we usually aim for 100mm where the reveal allows.
How we work
How the job runs
Five steps. Same on every secondary glazing job, big or small.
01
Survey
We measure the existing reveal, photograph the sash or casement, and confirm whether hinged, vertical sliding or fixed is the right answer.
02
Quote and finish match
Frame finish matched to the existing reveal, anthracite, ivory, white or bespoke RAL. Acoustic upgrades quoted as a clear line item.
03
Manufacture
Aluminium frame profiles cut and finished, glass cut and (for acoustic) laminated. Two to three weeks typical.
04
Install
Most rooms are a single-day job. No disturbance to the original window. No mess, no scaffolding.
05
Listed building support
Where listed-building consent is required, we draft the supporting drawings and liaise with the conservation officer.
Ready to start?
Send a brief and we will reply within one working day with a written quote and an honest lead time.
Get a free quote
Recent work
Recent projects across Sussex
Recent Brooklands projects from across Sussex.
Frameless oak-and-glass stairwell, Hove
- Size8 metres of frameless balustrade
- Lead time3 weeks from order to install
Bespoke RAL splashback run, Worthing
- Size3.2 metre kitchen run, low iron toughened
- Lead time2 weeks from template to install
FAQs
Frequently asked questions
Common questions about secondary glazing from our customers across Sussex.
Yes. In fact, it is the recommended thermal upgrade for most listed buildings and conservation area homes. The original window is undisturbed. Listed building consent is generally easier to obtain for secondary glazing than for full replacement.
A single-glazed original window with secondary glazing in front performs roughly the same as a modern double-glazed window. Most customers report rooms reaching comfortable temperatures faster and staying warmer with less heating.
Standard systems cut noise by 25 to 35 dB. That is the difference between a busy road sounding loud and sounding distant. Acoustic spec systems cut noise by 45 dB or more.
No. Secondary glazing fits inside the existing window and is invisible from the street.
Yes, when you open the secondary glazing first. Hinged and sliding units open easily for cleaning and ventilation.
Double glazing is one window with two panes sealed inside a single frame. Secondary glazing is two separate windows with an air gap between them. Secondary glazing leaves the original window intact, which matters for listed buildings and conservation areas.
Where we cover
Secondary glazing across Sussex and Surrey
Lancing, Worthing, Shoreham-by-Sea, Hove, Brighton, Littlehampton, Steyning, Storrington, Horsham, and across the rest of West Sussex, East Sussex and Surrey by arrangement.
Let's get in touch.
Your project deserves glass made by the people who fit it. Send a quick description or a photo - we will come back to you within one working day with a written quote.