Double Glazed Windows South Africa

Double Glazed Windows South Africa use two panes with a sealed air or gas gap between them instead of one sheet of glass. The gap is what does the work: it slows heat moving through the window and takes the edge off outside noise. The frame has to suit the heavier unit, so this is a different window rather than the same window with better glass. Say what you are trying to fix and get priced quotations to compare.

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Know what double glazing should cost a square metre, so you never pay too much.
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Say what you are trying to fix, noise or heat, and get quotes.

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Double Glazed Windows Prices

Ballpark figures so you can check a quotation.

Item	Ballpark price
Double glazed window, standard frame, per square metre	R4,600 - R8,200
Double glazed window, thermally broken frame, per square metre	R7,500 - R14,000
Low emissivity coated unit, added per square metre	R600 - R1,800
Acoustic build up with laminated pane, added per square metre	R900 - R2,600
Standard bedroom window, 1.5m by 1.2m, fitted	R8,500 - R16,000
Large fixed pane, 2.4m by 1.8m, fitted	R22,000 - R48,000
Replacing a failed sealed unit, per unit	R1,800 - R5,500
Whole house, eight to twelve openings	R95,000 - R260,000

Prices JUST UPDATED. Ballpark figures, rounded, excluding VAT. They reflect typical South African aluminium window, door and glazing rates, supplied and installed. They are not our prices or quotations, and no provider is bound by them. Aluminium is MADE TO ORDER, so a firm price follows a site measure rather than a drawing, and the system, the glass and the finish move a quotation further than the size does. Confirm what each quotation includes, such as removing the old frame, making good, and the glass type for every opening.

What a Double Glazing Quote Covers

The insulated glass unit. Two panes, a spacer and a sealed cavity, made as one sealed unit.
The frame system. A deeper profile than single glazing, because the unit is thicker and heavier.
Whether the frame is thermally broken. A plain aluminium frame conducts heat around the glass you just paid for.
The glass build up. Pane thicknesses, any coating and whether one pane is laminated.
Installation. Heavier units mean more hands and sometimes different fixings.

Noise or Heat: They Are Not the Same Job

For heat, the cavity and the coating matter. An even gap with a low emissivity coating is what slows heat transfer.
For noise, asymmetry matters. Two panes of different thickness, with a wider gap, beat two matching panes.
Laminated glass helps noise. The interlayer damps vibration, which is why it turns up on road facing windows.
The frame and the seal matter as much. Most noise comes through gaps, not through glass.
Say which problem you have. A unit built for heat is not the unit built for noise.

Where Quotes Differ Most

Whether the frame is thermally broken. The single largest gap between two double glazing prices.
Coatings. A low emissivity coating costs more and changes the performance.
Unit size. Large units need thicker panes and are heavy to handle.
Retrofit or new build. Existing openings rarely have the depth a deeper frame wants.
Lead time. Sealed units are often made to order separately from the frame.

Get a price for your own openings rather than a range.

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What Affects the Price

The frame. Thermally broken or not is the biggest single decision in the price.
The glass build up. Thicknesses, coatings and whether a pane is laminated.
The area. Square metres, with large units costing more a metre rather than less.
Retrofit depth. An existing opening may need the reveal opened up to take a deeper frame.
Which problem you are solving. An acoustic specification and a thermal one are different units.
Access. Sealed units are heavy, and upper floors need equipment.

What to Include in Your Request

The address. Suburb and town.
The opening sizes. Width and height of each one.
What you want to fix. Traffic noise, afternoon heat, condensation or all three.
Which way the windows face. West facing glass is a heat problem; a road facing wall is a noise one.
What is there now. Single glazed aluminium, steel or timber.
Whether it is a retrofit. It decides whether the opening can take a deeper frame.

Before You Appoint a Double Glazing Supplier

Ask whether the frame is thermally broken. Double glazing in a plain aluminium frame gives away much of the benefit.
Ask what the glass build up is. Pane thicknesses, the cavity width and any coating, written on the quote.
Ask for the acoustic or thermal intent to be stated. So the unit matches the problem you described.
Ask about the sealed unit warranty. Units fail by losing their seal, and that shows as misting inside the glass.
Ask how SANS 10400-XA is being met. New work has to meet the energy requirements, and the glazing is part of that calculation.
Be wary of performance promises in numbers. A figure is only meaningful for a specific tested system, so ask which one it refers to.

Double Glazed Windows FAQs

How much does double glazing cost in South Africa?

Roughly R4,600 to R8,200 a square metre supplied and installed in a standard aluminium frame, and R7,500 to R14,000 a square metre in a thermally broken frame. A standard bedroom window commonly lands between R8,500 and R16,000 fitted. It is typically two to three times the cost of the same window single glazed.

Is double glazing worth it in South Africa?

It depends on what you are solving. For traffic or neighbour noise it makes an obvious difference, and that is the reason most South African owners buy it. For heat, it helps most on west facing glass and in the colder inland winters, but shading the glass from outside is often cheaper for the same comfort gain.

What is a thermally broken frame?

A frame with an insulating barrier between the inside and outside aluminium, so heat cannot travel straight through the metal. Without it, the frame bypasses much of what the glass is doing. It costs noticeably more and is the question worth asking first.

Will double glazing stop condensation?

It usually reduces it, because the inner pane stays warmer than a single sheet would. It does not fix the underlying cause, which is moist air and not enough ventilation. If the misting appears between the panes rather than on the room side, the sealed unit has failed and needs replacing.

Can I double glaze my existing windows?

Sometimes, but not by swapping the glass. The frame has to be deep enough to hold a thicker, heavier unit, and most single glazed frames are not. The usual answer is a new window in the same opening, which is why removal and making good belong in the quote.

How long does it take?

Longer than single glazing, because the sealed units are often made separately from the frames. Expect several weeks, and ask for the lead time in writing before you book other trades.

Double glazing is usually priced against the single glazed version of the same window, and Aluminium Windows South Africa makes it easy to get both quoted side by side.

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