The short answer
Yes, old steel windows can usually be replaced with aluminium without rebuilding the whole wall.
The result depends on accurate site measurements, a window design suited to each room, careful removal of the steel frame, and proper fixing and sealing of the new aluminium frame.
If you are looking for aluminium windows in Krugersdorp, the installer should explain the complete process before manufacturing begins.
Why Krugersdorp homes make this upgrade
Many older homes across Monument, Krugersdorp North, Kenmare, Dan Pienaarville, and the CBD still have their original steel frames.
Steel can serve a home for decades, but repeated exposure to rain, Highveld temperature swings, and failed paint eventually leads to rust, cracked putty, stiff opening sections, loose glass, and draughts around the frame.
Aluminium removes the repainting cycle and gives you more choice over how each window opens, how much air enters the room, which glass is used, and what the finished exterior looks like.
Repair the steel or replace it?
Surface rust and tired paint do not always justify replacement. If the steel is still structurally sound, the window closes properly, and the glass is secure, repair and repainting may extend its useful life.
Replacement becomes the better option when rust has eaten into the frame, opening sections no longer align, putty repeatedly fails, water or dust enters around the window, or several windows need the same repair cycle.
Our steel versus aluminium window guide helps you compare the two materials without assuming every old frame must come out.
The steel-to-aluminium replacement process
1. Inspect every opening
The installer should inspect the frame, sill, surrounding plaster or brickwork, burglar proofing, blinds, tiles, access, and the way each room is used.
A bathroom window may need privacy glass and controlled ventilation. A lounge may benefit from a wide fixed pane with selected openers. A road-facing bedroom may need a glass specification chosen around sound and comfort.
2. Measure the actual opening
Final measurements must be taken on site. Older openings are often slightly out of square, and a frame made from a rough homeowner measurement can be too tight, too loose, or difficult to seal cleanly.
The installer records the opening size, reveal depth, sill condition, wall finish, and any obstructions before the manufacturing sizes are confirmed.
3. Agree on the window schedule
The window schedule should show the style, size, colour, glass, and opening direction for every unit.
Common options include top-hung windows for controlled ventilation, sliding windows for wide openings, and casement or combination windows where selected sashes open around fixed panes.
Check that outward-opening sections will not clash with walls, gutters, security fixtures, paths, or one another.
4. Manufacture before removal
The aluminium windows should be manufactured before the steel frames are removed.
That keeps the home secure and weather-resistant until the installation team is ready to replace each opening. It also means the old window is not removed while everyone waits for a missing frame or glass unit.
5. Remove the steel frame carefully
The team protects the nearby floor and furniture, removes the glass safely where necessary, cuts or releases the steel frame, and takes it out without damaging more of the opening than the job requires.
Some plaster disturbance is normal because old steel frames are fixed into the wall. The aim is controlled removal followed by a clean, stable opening for the new frame.
6. Fit, level, fix, and seal the aluminium frame
The new frame is positioned square and level so the sliding or hinged sections operate freely. It is then mechanically fixed, glazed as specified, sealed around the perimeter, and checked for drainage and clean operation.
Sealant cannot rescue a badly sized or crooked frame. The fit must be correct before the finishing work starts.
7. Make good and sign off
The team finishes the perimeter according to the agreed scope, removes installation debris, cleans the work area, and checks every handle, lock, stay, roller, and opening section.
You should walk through the completed work and understand how to operate and clean the windows before final sign-off.
How much mess should you expect?
Steel-window removal is building work, so there will be noise, dust, and some disturbance around the opening.
A careful installer controls that disruption with floor protection, a planned room-by-room sequence, safe glass handling, debris removal, and clear agreement about plaster or paint touch-ups.
Move fragile items, curtains, and furniture away from the windows before the team arrives. Tell the installer about alarm contacts, hidden cables, tiled reveals, blinds, and security bars during the site measure rather than on installation day.
How long does replacement take?
Manufacturing happens before the team arrives to remove the steel windows. The on-site programme then depends on the number and size of openings, access, wall condition, glass specification, and the amount of making good included.
A single straightforward replacement can often be completed in a day. A full-home project is normally sequenced across several working days so the property remains secure and the team can finish each group of openings properly.
The written quote should separate manufacturing lead time from the days spent on site.
Which glass should go into the new frames?
Do not automatically copy the old glass. The replacement is the right time to decide what each room needs from privacy, safety, heat, noise, security, and natural light.
Clear glass suits many ordinary openings. Obscure glass is useful in bathrooms. Laminated or toughened safety glass may be required or preferred in higher-risk positions. Low-e glass and double-glazed units can be considered where comfort and noise matter.
The correct choice depends on the location and dimensions of the pane, so the installer should specify it as part of the window schedule.
Do you need to replace every steel window at once?
No. A staged project can work well when the budget is spread over time.
Start with the worst frames, the rooms most affected by draughts or noise, or one complete elevation of the home. Keeping each phase to a logical group makes it easier to maintain consistent colours, frame lines, glass, and hardware.
Ask the installer to record the chosen specification so later phases can match it as closely as possible.
Mistakes that create expensive problems
- Ordering from rough measurements instead of a final site measure.
- Choosing every room’s window style from a catalogue without checking how the space is used.
- Comparing a supply-only frame price with a complete installed quote.
- Leaving glass type, hardware, removal, sealing, or making good unspecified.
- Removing old frames before the replacements are manufactured and checked.
- Treating sealant as the solution for an oversized gap or an out-of-square frame.
- Mixing similar-looking colours without confirming the exact finish.
Choosing aluminium window installers in Krugersdorp
Ask to see real installation work, a written window schedule, the complete scope, and the workmanship guarantee.
Confirm who measures, who manufactures, who installs, and who returns if an opening needs adjustment after handover. The cheapest quote is not cheaper if it excludes removal, glass, sealing, or the work needed to finish the wall around the new frame.
Alu-Value has worked across the West Rand since 1996 and serves Krugersdorp suburbs from its Rustenburg Road base. We measure on site, manufacture to the confirmed openings, install with our own team, and back the workmanship with a 2-Year Installation Guarantee.
Plan your steel-window replacement
Send photos of the existing windows, rough sizes, the number of openings, and your suburb for an early assessment. We will arrange the site measure needed for a final written quote and window schedule.
Request an aluminium window quote on WhatsApp or call 082 892 3957.