Full swing-clear access — the specification for deep reveals, shutters and awkward openings.
Hinged casement units fitted throughout London homes and flats.
Hinged secondary glazing swings open on a side or top hinge like a casement door. Because the whole panel clears the opening, it gives unrestricted access to the primary window — essential where you have working internal shutters, deep splayed reveals, or window furniture that a sliding track would foul.
Acoustically, hinged units are the strongest opening style we supply. There is no track gap and no meeting stile: the panel closes onto a continuous compression seal around all four edges, which is the same detail used on fixed panels. With 10.8mm acoustic laminate and a generous cavity, hinged units reach 53dB.
Choose hinged where the window has original internal shutters that must still fold back, where the reveal is deep enough that a slider would sit too far forward, or where the opening is tall and narrow so a horizontal track would be impractical.
Sound leaks through gaps, not through glass. A hinged panel compresses a single continuous EPDM gasket around its full perimeter when the multi-point latch is thrown, eliminating the meeting-stile flanking path that costs sliders a few decibels.
That makes hinged the right specification for bedrooms on flight paths, main roads and rail corridors where you want every available decibel.
Top-hung units are used above head height and on transom lights, holding open on a friction stay. Wide openings can be glazed as a double-leaf pair meeting on a central rebate, so a 1.8m casement still opens fully without an oversized single panel.
Every hinged installation in London follows the same five-stage process, from first acoustic assessment to final seal calibration. Most homes are surveyed within a week and installed in a single day per three to four windows.
Before we specify a single hinged leaf we run a structured acoustic assessment of the room. The goal is to identify the dominant noise source, measure how much of it is reaching you through the window versus around it, and set a realistic decibel target for the finished installation.
The whole assessment takes about 60-90 minutes on site for a typical London flat or townhouse floor, and you receive the written findings with your fixed quote.
Every figure below appears in your survey report, so the specification can be checked against evidence rather than assumption.
Typical London project timings. Listed and conservation properties add roughly two to six weeks at the consent stage, which we handle on your behalf.
Every hinged secondary glazing quote in London is fixed after survey — the price you sign is the price you pay, with survey, manufacture, installation, waste removal and the post-fit dB check all included. The ranges below cover the vast majority of London period windows.
Supply-and-fit price ranges: a single side-hung leaf runs £520-£760 depending on size and glass, a double-leaf pair £790-£1,150, a top-hung transom light £340-£480, and a full bay of three to five leaves £1,650-£3,200. The 10.8mm acoustic laminate upgrade adds £130-£190 per window, low-E thermal glass £60-£110, and colour-matched RAL or heritage finishes £45-£90.
Installation costs are already inside those figures. There is no separate day rate, no scaffolding charge for internal work, and no VAT surprise — quotes are shown inclusive. The only items ever charged separately are structural sub-frames for out-of-square reveals (£70-£140 per window) and conservation drawing packs for listed properties (£180 fixed, refunded against the order).
Financing: whole-house projects can be spread over 6, 12 or 24 months. Interest-free 6 and 12 month plans are available on orders over £1,500, with 24-month plans offered at a low fixed rate, subject to status and a soft credit check that does not affect your score. A 25% deposit secures manufacture and the balance is due on completion — or spread from the completion date if you are financing.
| Specification | Price | Notes |
|---|---|---|
| Single side-hung leaf, 6.4mm laminate | from £520 | Up to 0.9m x 1.5m |
| Double-leaf pair, 6.4mm laminate | from £790 | Openings 1.2m-1.8m wide |
| 10.8mm acoustic laminate upgrade | +£130-£190 | Per window |
| Top-hung transom light | from £340 | Above head height |
All prices supplied and fitted in London, inclusive of survey and warranty (10 years standard, 25 years premium and heritage). See the full secondary glazing price list.
Belgravia, SW1
Problem: Grade II listed drawing room with working panelled shutters; sliding tracks would have blocked the shutter fold.
Solution: Slim side-hung hinged panels in heritage white, set behind the shutter box with 10.8mm laminate at 160mm cavity.
Result: 31dB measured reduction, shutters still operate nightly, and conservation officers accepted the reversible fixing detail.
Free London survey, measured dB assessment and a written specification within 48 hours.
