JCB KNOWLEDGE & ADVICE

Replacing Windows with Aluminium: A Planning Guide

Replacing existing windows starts with the opening and the condition of what is already there. A clear brief helps you compare suitable aluminium window options and understand the work around the frame.

Start here

Photograph each opening, record approximate sizes and quantities, choose how the windows should open, and confirm removal and finishing responsibilities before approving the replacement.

1. Record what is being replaced

Create a simple list by room. Record the approximate width and height of each window, how many of that type are needed and whether the existing frame is steel, timber or aluminium. Label photographs to match the list.

Include the surrounding wall, sill and any burglar bars, shutters or internal finishes. Show damaged areas separately. These details help explain the work needed around the frame as well as the window itself.

Keep the opening or change it?
State whether the proposed window will fit the existing opening or if building alterations are planned.
Assess the surrounding work
Identify plaster, paint, tiles and security fittings that may be affected.

2. Decide how each room needs to ventilate

A window design should work with the room layout and how you reach the opening panels. JCB offers sliding, folding and top-hung aluminium windows. Consider nearby furniture, counters and the space outside the window.

Compare the position and amount of opening space, not only the appearance of the frame. Access for cleaning and operation also matters, especially above counters or on upper floors.

3. Review glass and frame finish together

Describe the room and what needs to change: daylight, privacy, glare or appearance. Existing glass does not have to be the starting specification for the replacement, but the proposed glass must be appropriate for the application.

Coordinate the window finish with doors and other aluminium work. Glass appearance varies with light conditions, and tinted glass should not be assumed to provide night-time privacy. Use the Knowledge & Advice guide to compare the options before confirming them for your project.

4. Confirm removal, installation and finishing work

Ask for the quote to identify who removes the old window, clears the material and prepares the opening. Confirm fitting, sealing and any plaster, tile or paint repairs. Where several trades are involved, agree the sequence so the new frame and surrounding finishes can be completed properly.

Site access also needs consideration. Explain upper-floor work, restricted access and whether rooms remain occupied. Ask JCB to confirm the project timing after the scope and materials are known.

5. Consider whether repair addresses the actual problem

An operating fault in an otherwise suitable aluminium window may justify a repair discussion. Frame condition, the cause of the fault and compatible parts influence whether that is practical.

If you want to change the configuration, glazing or overall arrangement, explain those goals when enquiring. Replacement and repair solve different problems; send photographs and a description so the appropriate route can be considered.

Send a window schedule with your enquiry

You can start with approximate dimensions and photographs. Send the project area, room-by-room quantities, preferred opening styles and any plans. Final manufacture dimensions and installation details need confirmation before the order proceeds.

PUT THE GUIDE TO WORK

Explore the relevant options

Explore aluminium windows Discuss a repair Compare glass and privacy options Aluminium Window Replacement

YOUR GAUTENG PROJECT

Start with the opening and the details.

Send the location, photographs and approximate measurements. JCB can discuss the appropriate next step for your project.

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