5 Ways to Make Sure You Choose the Right Double Glazing Windows Installer

With so many installers out there, choosing double glazing can feel harder than it should. Here’s our double glazing advice on what to look for when buying double glazing, so you can pick with confidence.

What To Check Before Choosing An Installer

1. Guarantees and warranties

One of the simplest ways to ensure you have peace of mind when dealing with a double glazing company is to make sure their products come with guarantees and warranties. No mention of either is a reason to steer clear.

2. Reviews and reputation

There are many review platforms that are reputable and will give you a decent general opinion on a company: Google, Which?, and Checkatrade are a good start, alongside home improvement forums.

3. Experience

Look for companies that have been trading for at least a decade in order to increase your chances of having the outcome you want.

4. Accreditations

Check for the BSI kitemark and Secured by Design approval: both are strong indicators a window or door is genuinely secure.

5. FENSA registration

This confirms the company is compliant with building regulations, and that it has been regularly inspected and held accountable in order to meet the expected standards and competencies of a modern glazing company.

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Questions To Ask An Installer

  • What guarantee covers the product, and separately, the installation?
  • Are you FENSA registered, can I see the number?
  • Can I get a written, itemised quote?
  • Who actually does the installation: your team, or a subcontractor?

National Firm Or Local Installer?

National firms offer standardised guarantees and wider product ranges.

Local installers are often better priced and easier to hold accountable directly, and a strong local reputation can be just as reliable a sign as a national brand name.

It mostly comes down to whether you value convenience or price and a more personal relationship.

Warning Signs Of A Poor Installer

  • Pressure to sign on the day, especially with a “vanishing” discount
  • No FENSA registration, or reluctance to confirm it
  • Verbal-only quotes with nothing written down
  • No fixed trading address, or little to no reviews online

More than one of these together is a good reason to look elsewhere.

Direct Or Through An Installer?

Buying direct from a manufacturer can be cheaper, but leaves you relying on one company for everything.

An accredited installer usually offers more product choice and one point of accountability for the whole job, the lower-risk route for most homeowners.

Ready To Compare Installers?

If you’re thinking about getting double glazed windows for your home, contact Compare Companies today. You might also find it useful to compare different types of double glazing glass or see which window style suits your home first. Or call us on 0800 084 5076.

Frequently Asked Questions

What should you check before hiring a double glazing company?

Guarantees and warranties, reviews and reputation, trading history, security accreditations, and FENSA registration.

What questions should you ask a double glazing installer?

Ask about product and installation guarantees, FENSA registration, a written itemised quote, and whether the work is done in-house or subcontracted.

Should you use a national double glazing firm or a local installer?

Both can work well: national firms offer standardisation and choice, local installers often offer better prices and closer accountability.

What are the warning signs of a poor double glazing installer?

Pressure to sign immediately, no FENSA registration, verbal-only quotes, no fixed address, and little to no reviews online.

Is it better to buy double glazing direct or through an installer?

Direct can be cheaper but riskier; an accredited installer usually offers more choice and accountability, making it the safer option for most homeowners.

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