Loading
The best secondary glazing matches how your existing window opens. Compare the five main types below to see which suits each window in your home — most properties use a mix.
Mirrors the movement of a sash window, so it looks and operates in harmony with the original. The natural choice for Georgian and Victorian sashes.
Read the full guide →Glides sideways for easy everyday ventilation, ideal for wide openings and large casement runs where a vertical slide would be impractical.
Read the full guide →Opens fully for complete access to the primary window behind, perfect where you want to throw the window wide open or reach deep reveals.
Read the full guide →A discreet, removable panel for windows you open seasonally rather than daily. Easy to take out for cleaning or summer ventilation.
Read the full guide →The slimmest, most cost-effective option, offering maximum noise and thermal performance for windows that do not need to open, such as landing windows.
Read the full guide →Discreet vertical-sliding units made for Georgian & Victorian sashes.
Bespoke multi-panel systems shaped to angled and curved bays.
Acoustic laminate and wide air gaps cutting up to 80% of noise.
Fully reversible, consent-friendly glazing for protected homes.
The golden rule is simple: your secondary glazing should mirror how your existing window works. A vertical-sliding sash pairs naturally with a sliding secondary unit so both halves still open the way they were designed to. A side-hung casement suits a hinged secondary casement, while awkward or rarely-opened windows are often best served by a lift-out or fixed panel that maximises the acoustic seal.
Three factors decide the outcome. Ventilation comes first — bedrooms and kitchens need units you can open easily, whereas a hallway window might take a fixed panel. Performance comes next: the wider the air gap and the heavier the glass, the greater the noise and heat reduction, which matters most on road-facing elevations. Finally, aesthetics govern the frame finish and sightlines, a particular concern in listed and conservation-area homes where the glazing must stay visually discreet.
Most period properties end up with a mix — sliding sash units to the front, hinged casements to the rear, and the occasional fixed panel for a landing or bathroom. Bespoke manufacture means every unit is built to the exact size and shape of its opening, so nothing looks bolted-on. If budget is your main question, our secondary glazing cost guide breaks down pricing by type and glass specification.
A free survey is the easiest way to decide. We assess each window and recommend the right style, balancing ease of use, ventilation and performance. You can also start with our complete guide to secondary glazing or compare secondary glazing vs double glazing.
Book a free survey and we'll demonstrate how each option opens and recommend the best fit for your home.