Can secondary glazing fit a curved or splayed bay?

Yes. Every unit is made to measure and we configure panels to follow the precise angles of square, splayed and curved bay windows for a neat, continuous fit.

Will it spoil the look of my bay window?

No. We use slimline frames and discreet finishes designed to sit quietly behind the original windows, preserving the character of the bay inside and out.

Are bay windows harder to fit than flat windows?

Bays require more careful measurement and a bespoke configuration, which is exactly what our specialist survey and made-to-measure manufacture deliver. The result is a precise, draught-free fit.

Will it make my bay warmer?

Significantly. Bay windows lose a lot of heat through their large glazed area and many joints. A sealed secondary glazing cavity cuts heat loss by up to 75% and removes draughts.

Can I have acoustic glass in a bay?

Yes. Acoustic laminated glass is a popular choice for bay-fronted rooms facing busy roads, reducing noise by up to 80%.

Secondary Glazing

Bay Window Secondary Glazing

Made-to-measure secondary glazing that follows the angles of square, splayed and curved bay windows. Banish draughts and noise from your bay-fronted rooms while keeping the classic character of your Victorian or Edwardian home — across London and Hertfordshire.

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A bay window with discreet secondary glazing across the angled panes

Bespoke for bays

A precise fit for every angle of your bay

Bay windows are a defining feature of period homes, but their large glazed area and many joints make them one of the draughtiest, coldest and noisiest parts of the house. Their angled geometry also makes them tricky to upgrade without losing the original windows.

Our bespoke bay secondary glazing is configured panel by panel to follow the exact angles of your bay — whether square, splayed or curved. You get a seamless, draught-free, quieter bay that keeps all of its period character, with full access to the original windows retained.

Why choose it

The benefits of bay secondary glazing

Made for angled bays

Bespoke units follow the angles of square, splayed and curved bay windows for a seamless fit.

Keeps the bay's character

The classic look of your Victorian or Edwardian bay is fully preserved from inside and out.

Warmer, draught-free bays

Bay windows are notorious for draughts — a sealed cavity makes them comfortable year round.

Quieter living spaces

Acoustic glass options cut street noise in the bay-fronted rooms that face the road.

Full access retained

Sliding and hinged panels let you open and clean the original bay windows with ease.

Discreet slim frames

Slimline sections in your choice of colour keep sightlines clean across the whole bay.

Transparent pricing

What does secondary glazing cost?

Secondary glazing is priced per window, and the final cost depends on size, system type, glass specification and frame finish. The figures below are typical retail ranges for installed secondary glazing units in London and Hertfordshire — every survey we provide is fixed, written and free of obligation.

System type	Typical size	Standard 4mm glass	Acoustic / thermal glass
Lift-out / fixed panel	Small (up to 0.8m²)	£350–£550	£450–£700
Horizontal sliding	Medium (0.8–1.5m²)	£450–£750	£600–£950
Vertical sliding sash	Medium (0.8–1.5m²)	£550–£900	£700–£1,200
Side-hung casement	Medium (0.8–1.5m²)	£500–£850	£650–£1,100
Bespoke bay / angled	Per bay (3–5 panels)	£1,400–£2,800	£1,900–£3,800

Prices include survey, manufacture and installation. Frame colours, hardware finish and glass specification are all included in your fixed written quote — no hidden extras.

Volume discounts available for whole-house installations (5+ windows). Many of our customers spread payments across a 2–3 month installation programme — ask us about phased works during your survey.

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How it works