Insights > Article > Posted: 2025-Apr-14, Updated: 2026-May-11

Checklist - Choosing a window and door Installer

Choosing the right window installer can make all the difference in the performance, durability, and appearance of your new windows.

To help you feel confident in your decision, use this checklist to compare installers based on qualifications, reputation, communication, and installation practices. A good installer will check most — if not all — of these boxes.

Company Credentials

	Yes	No
Company is licensed to operate in your area	☐	☐
Carries liability insurance	☐	☐
Provides proof of WSIB or worker's comp (if applicable)	☐	☐
Has a physical business address in your region	☐	☐

Reputation & References

	Yes	No
Strong online reviews (Google, HomeStars, BBB)	☐	☐
Provides references from recent customers	☐	☐
No pattern of unresolved complaints	☐	☐

Communication & Transparency

	Yes	No
Provides a clear, written estimate with no hidden fees	☐	☐
Explains installation method (e.g., retrofit vs full frame)	☐	☐
Willing to answer questions patiently and clearly	☐	☐
Offers timeline and explains process	☐	☐

Installation Practices

	Yes	No
Experience with the type of windows you're installing	☐	☐
Work done by in-house team or verified subcontractors	☐	☐
Uses proper materials, flashing, caulking, insulation	☐	☐
Cleans up job site and disposes of old materials	☐	☐

Warranty & Support

	Yes	No
Offers a product warranty (from the manufacturer)	☐	☐
Offers a labour/workmanship warranty	☐	☐
Provides warranty details in writing	☐	☐
Has a process for follow-up service or repairs	☐	☐

Red Flags to Watch Out For

	Seen?
Pushy sales tactics / high-pressure offers	☐
Won’t provide insurance/licence details	☐
Quote is vague or verbal only	☐
Doesn’t explain installation details	☐
Reviews mention poor cleanup or unfinished work	☐

Does professional installation really matter?

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Make your choice with confidence!

Whether you're comparing a few companies or narrowing it down to one, this checklist helps you spot quality—and avoid costly mistakes. A trustworthy installer should pass this test with ease.

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