Most homeowners meet a window supplier two or three times before signing a contract worth many thousands of dollars. In those short conversations, the questions you ask do more than gather information — they reveal how a supplier thinks, how transparent they are, and how they will behave when something goes wrong.
The questions that matter
1
Is this a genuine system, or assembled aluminium?
A confident supplier explains the difference without defensiveness — and shows you. See
seven ways to tell.
2
Can you show me a cross-section?
The thermal break, seals and drainage. A real specialist keeps cut samples and is glad to walk you through them.
3
What exactly is the glass specification?
The answer should be specific — glazing, coating, laminate — not just “tempered glass.”
4
What does the installation price include?
Removal, disposal, waterproofing, making good, access — all in writing. Vagueness now is a variation order later.
5
Who actually does the installation?
Your own team, or a subcontractor? The answer tells you who is accountable on site.
6
How do you handle waterproofing and sealing?
This is where most leaks begin. You want a clear, specific method — not a shrug.
7
What's the timeline, and what if it slips?
Honest suppliers give realistic dates and tell you how delays are handled.
8
What does the warranty cover, and who honours it?
Scope, duration, and whether it is you or the manufacturer standing behind it — in writing.
The two-year question
“If a window leaks or the hardware fails in two years, what exactly happens?” The calm, specific answer is the one you want. This single question separates a transaction from a relationship.
Green flags vs red flags
Reassuring signs
- Keeps cut samples and shows you the internals
- Itemises exactly what installation includes
- Explains waterproofing method specifically
- Puts warranty scope and duration in writing
- Gives realistic timelines, not just the ones you want to hear
- Welcomes hard questions
Reasons to pause
- Deflects when asked to show a cross-section
- Quotation is vague (“aluminium window”, “tempered glass”)
- Installation scope left unsaid
- Won't commit warranty terms to writing
- Pressure to sign today for a “special price”
- Answers about after-sales are hand-wavy
You're not just buying a window. You're choosing who to trust with your home.
The answer beneath the answers
Notice that none of these questions is really about price. They are about transparency and accountability — whether a supplier explains, shows, commits in writing, and stands behind the work. A supplier who welcomes hard questions is telling you something reassuring before you have signed a thing. One who deflects them is telling you something too.
If you would like to put these questions to us in person — samples on the table, nothing rushed — that is what the Experience Centre is for. And before you compare prices, our guide to the hidden costs homeowners miss will help you read each quote for what it really says.
Key takeaways
- The best questions are about transparency and accountability, not price.
- Ask to see a cut sample, an itemised installation scope, the waterproofing method, and the warranty in writing.
- Green flags: shows internals, commits terms to writing, welcomes questions. Red flags: vagueness and pressure to sign today.
- “What happens if it fails in two years?” is the question that reveals the most.
Common questions
How do I know if a window contractor is trustworthy?
Ask questions that require transparency: can they show you a cut sample, itemise exactly what the installation includes, explain their waterproofing method, and put the warranty scope in writing? A supplier who welcomes these questions and answers specifically is showing you how they will behave after you sign.
What should a window warranty cover in Singapore?
At minimum, the profile system, hardware and — importantly — the installation and sealing. Ask for the duration, exactly what is included and excluded, and whether the supplier or the manufacturer honours it. Get it in writing before signing.
Should I always choose the cheapest window quote?
No. The cheapest quote often leaves out installation details, uses thinner glass and cheaper seals, or describes assembled aluminium rather than an engineered system. Put every quote on the same specification first, then weigh price against what you are actually getting and who stands behind it.
Is it rude to ask a contractor a lot of questions?
Not at all — and a good one welcomes it. You are about to trust someone to open up and reseal your home. A supplier who is comfortable being asked to show samples, itemise scope and commit terms to writing is demonstrating exactly the accountability you want.
