Working out the cost of aluminium windows South Africa wide is harder than it should be, because most published prices are for a frame sitting on a shelf. That is not what a homeowner buys. You buy a finished opening: window, glass, fitting, sealing and plaster made good.
This guide prices the whole job rather than the part. It covers six real project sizes, what changes between provinces, and what a full-house replacement realistically costs in 2026.
Key takeaways
- Budget R2,500 to R5,000 per average window supplied and fitted.
- A typical three-bedroom house of 12 windows runs R34,000 to R68,000.
- Doing the whole house at once saves roughly 15 to 25 percent per window.
- Coastal jobs cost more, because hardware and coating specifications step up.
- Removing steel frames adds around R700 to R1,100 per opening over a like-for-like swap.
In this guide
The cost of aluminium windows South Africa homeowners actually pay
These are complete project figures, including units, glass, fitting, sealing, removal, disposal and making good.
| Project | Windows | Scope | Total cost |
|---|---|---|---|
| Single bathroom window | 1 | 600 x 900 replacement | R2,200 – R3,600 |
| One bedroom | 1 | 1200 x 1200 replacement | R3,100 – R5,200 |
| Living room upgrade | 2 | 1800 x 1500 plus 1200 x 900 | R8,500 – R15,000 |
| Two-bedroom flat | 6 | Full replacement, standard sizes | R18,000 – R34,000 |
| Three-bedroom house | 12 | Full replacement, mixed sizes | R34,000 – R68,000 |
| Four-bedroom family home | 18 | Full replacement plus patio door | R62,000 – R120,000 |
| Supplied and fitted, bronze or white powder coat, standard glass. Excludes structural alterations, scaffolding beyond two storeys and specialist glass. | |||
Figures reflect South African installer pricing in September 2026. Heritage properties, custom sizes and performance glazing sit above these ranges.
Where the money actually goes
On an average R3,800 fitted window, the split looks roughly like this.
That split shifts quickly with specification. Move to laminated safety glass throughout and the glass share climbs past 30 percent. Choose a charcoal or matt powder coat and the frame share rises. Replace steel frames rather than aluminium and the labour share jumps, because cutting out is slow and the making-good is heavier.
The line people forget is making good. It is small as a percentage and enormous as a source of disputes, because a quote that excludes it leaves you with a rough plaster edge around every window in the house.
How the cost of aluminium windows varies by province
| Region | Typical fitted price | Why |
|---|---|---|
| Gauteng | R2,900 – R4,400 | Most fabricators, strongest competition |
| Cape Town metro | R3,200 – R5,000 | Coastal specification, higher labour |
| Durban and coastal KZN | R3,300 – R5,200 | Marine-grade hardware, humidity |
| Eastern Cape | R3,000 – R4,700 | Fewer fabricators, transport |
| Rural and small towns | R3,400 – R5,600 | Callout distance and delivery |
Coastal pricing is higher for a reason rather than opportunism. Within a few kilometres of the sea, standard hardware corrodes, and the sensible specification moves to stainless fittings and a heavier powder-coat class. That is a genuine cost, and skipping it means replacing hardware in five years instead of fifteen. The coastal maintenance guide covers what salt air does to a standard specification.
Whole house at once, or a few at a time?
All at once
- 15 to 25 percent cheaper per window
- One delivery, one scaffold, one plasterer
- Every frame matches exactly
- Disruption over in days, not years
Staged over time
- Spreads the cash out
- Powder-coat batches can differ slightly
- Setup and callout paid each time
- Living with the job for years
If the budget will not stretch to everything, stage it by exposure rather than by room. Start with the elevations taking the most weather, usually south and west in the Cape, and the windows that already stick or leak. Leave the sheltered north face until last, because those frames age slowest.
If you are staging the work, ask your fabricator to record the exact powder-coat reference. “Bronze” is not a specification. Two bronzes from different coating runs sitting side by side on the same wall will not match.
Where to save, and where saving costs you later
Safe to save
Stick to standard sizes. Choose stock bronze or white. Keep fixed panes where you never open the window anyway.
Safe to save
Do the whole house in one go and negotiate on volume rather than on specification.
Never save
Hardware. Rollers, hinges, stays and locks are what fail, and budget versions fail fast near the sea.
Never save
The seal and the making-good. A cheap quote that stops at a bare opening is not cheaper, it is unfinished.
The other false economy is buying frames yourself and hiring a fitter separately. It sounds efficient and usually is not, because responsibility splits. If the window leaks, the fabricator blames the fit and the fitter blames the frame, and you are in the middle paying for both to come back.
We measure on site and quote the finished job, free and with no obligation.
Aluminium against the alternatives
Aluminium is not the cheapest material at the point of purchase. Timber is comparable and sometimes slightly less, uPVC is rare and expensive in South Africa, and steel is now largely a heritage and security product.
Where aluminium wins is over the following twenty years. It does not rot, warp, swell or need sanding and repainting every few seasons. A powder-coated frame washed twice a year is essentially maintenance free, which is exactly what a timber frame is not. The full comparison, including what timber actually costs to maintain in a Cape winter, is in our guide to aluminium vs wooden windows.
For a size-by-size breakdown of the frames themselves, see aluminium windows sizes and prices, and for what the fitting involves, aluminium window installation. Industry technical standards are maintained by the Association of Architectural Aluminium Manufacturers of South Africa.
What a proper quote should itemise
The reason three quotes for the same house can differ by R20,000 is almost never that one company is greedy. It is that they are quoting different jobs, and the differences hide in lines that are missing rather than lines that are wrong.
Insist on seeing seven things written down. The frame size and opening type for every window, given as dimensions rather than “bedroom window”. The frame section, 30.5mm or 38mm. The glass type and thickness, including where safety glass is used. The powder-coat colour with its reference code. Whether removal and disposal of the old frames is included. Whether plaster is made good inside and out, and whether paint is touched in. And the guarantee, split between the unit and the installation, because they are often different lengths.
Once all three quotes carry those seven lines, the comparison takes about five minutes and the cheapest one is usually no longer the cheapest.
Budgeting for a window project without surprises
Set the budget in three parts rather than one. The quoted figure is the first. A contingency of 10 to 15 percent is the second, because openings in older houses hide things: a cracked lintel, a rotted timber sub-frame, brickwork that crumbles when the old window comes out. None of that is visible until the frame is out, and none of it is the installer inventing work.
The third part is the finishing you will want once the windows are in. New frames make old paint look tired, and most people end up painting the room, or at least the wall. It is worth allowing for rather than discovering.
On timing, prices move with the aluminium billet price and the rand, so a quote older than about 30 days is a guide rather than a commitment. If you are staging work across a year, expect the later phases to cost more in nominal terms and budget accordingly.
One last thing worth knowing about the cost of aluminium windows South Africa suppliers quote: deposits of 50 to 70 percent are standard, because frames are made to order and cannot be resold. That is normal. Paying the full amount up front is not.
Frequently asked questions
What is the average cost of aluminium windows in South Africa?
Budget R2,500 to R5,000 per window supplied and fitted for standard residential sizes in 2026. Small bathroom windows sit at the bottom of that, large living-room units at the top.
How much does it cost to replace all the windows in a house?
A three-bedroom house with twelve windows typically runs R34,000 to R68,000 complete. A four-bedroom home with eighteen openings plus a patio door is usually R62,000 to R120,000.
Are aluminium windows cheaper than wooden ones?
Up front they are broadly similar, sometimes slightly more. Over twenty years aluminium is clearly cheaper because it needs no sanding, sealing or repainting.
Why are coastal quotes higher?
Salt air corrodes standard hardware and attacks lighter powder coats. Coastal specifications use stainless fittings and a heavier coating class, which costs more but lasts three times as long.
Does replacing windows add value to a property?
It helps, particularly where the existing windows are rusted steel or rotten timber, because buyers read those as deferred maintenance. Treat it as protecting value rather than as an investment that pays back in cash.
How much does removing old steel frames add?
Roughly R700 to R1,100 per opening over a like-for-like aluminium swap. Steel has to be cut out in sections and the surrounding plaster nearly always needs repair.
Should I get more than one quote?
Yes, three is sensible. Make sure each one lists frame sizes, glass specification, powder-coat colour and whether removal and making good are included, or you are comparing different jobs.
