10 Questions to Ask Your Aluminium Window Manufacturer Before You Buy

Choosing aluminium windows is a smart investment—but choosing the right manufacturer is just as important as choosing the window style. The quality of the profiles, glass, finishes, and installation will determine how your windows perform for decades.

Before signing off on a quote, here are 10 essential questions you should ask your aluminium window manufacturer, especially in the South African context.

1. What Aluminium Profile System Do You Use?

Not all aluminium systems are created equal.

Ask:

• Is the profile locally manufactured or imported? 
• Is it designed for residential or light commercial use? 
• What thickness and strength rating does it have? 

High-quality profile systems are straighter, stronger, and seal better over time.

2. What Glass Types Are Included in the Quotation?

Glass specification is often where costs are quietly reduced.

Confirm:

• Glass thickness (e.g. 4mm, 6mm, laminated) 
• Whether safety glass is included where required 
• Options for tinted, Low-E, or double glazing 

Glass plays a major role in safety, comfort, and energy efficiency.

3. Are the Windows Compliant With Building Regulations?

This is especially important for new homes and renovations.

Ask whether the windows comply with:

• Safety glazing regulations 
• SANS 10400-XA energy-efficiency requirements (where applicable) 

A professional manufacturer should understand compliance and guide you correctly.

4. What Finish and Coating System Is Used?

The durability of aluminium windows depends heavily on the finish.

Ask:

• Is the powder coating UV-resistant? 
• Is marine-grade coating used for coastal areas? 
• Are anodized finishes available if required? 

Low-quality coatings can fade, chalk, or peel prematurely.

5. What Drainage and Weather-Sealing Systems Are Built In?

Good aluminium windows are designed to manage water effectively.

Confirm:

• Presence of drainage channels 
• Quality of rubber seals and gaskets 
• Protection against wind-driven rain 

Poor drainage is one of the most common causes of window leaks.

6. What Security Features Are Included?

Security is a key concern for South African homeowners.

Ask about:

• Locking mechanisms (single vs multi-point) 
• Compatibility with laminated safety glass 
• Reinforcement options for larger windows 

Aluminium windows can be highly secure when properly specified.

7. Who Installs the Windows?

Manufacturing quality means little without proper installation.

Clarify:

• Is installation included in the quote? 
• Are installers trained or subcontracted? 
• Who is responsible for snags or adjustments? 

Incorrect installation is the leading cause of performance issues.

8. What Warranties Are Provided?

A reputable manufacturer should offer clear warranties.

Ask for written confirmation of:

• Frame and profile warranties 
• Powder-coating or finish warranties 
• Glass warranties (if applicable) 

Be cautious if warranty terms are vague or verbal only.

9. What Is the Lead Time and Project Timeline?

Understanding timelines helps avoid frustration and delays.

Ask:

• How long manufacturing will take 
• When installation can be scheduled 
• What factors could cause delays 

Clear communication upfront prevents unrealistic expectations.

10. Can You Provide References or Completed Projects?

Experience matters.

Ask to see:

• Previous residential projects 
• Photos of completed installations 
• References or testimonials 

This gives confidence in workmanship, consistency, and after-sales service.

Why These Questions Matter

Many aluminium window problems—leaks, rattling, corrosion, poor insulation—are not caused by aluminium itself, but by poor specification or workmanship. Asking the right questions ensures you’re buying a complete, well-designed system rather than just a product.

Final Thoughts

Aluminium windows are a long-term investment in your home’s comfort, appearance, and value. By asking these 10 questions before committing, you protect yourself from shortcuts, hidden compromises, and costly repairs down the line.

A professional aluminium window manufacturer will welcome these questions—and have clear, confident answers.