- September 21, 2026|
- Windows|
- sandymount_admin
Choosing the right double glazing company comes down to five things: checking accreditations such as FENSA and the Glazing Federation, reading genuine customer reviews, understanding what the guarantee covers, judging product quality over price, and asking direct questions before you commit.
New double glazing is a big investment, so it’s tempting to focus purely on frame material or window style. But the product is only half the story. The installer you choose matters just as much, from thermal performance on day one to how easily problems get sorted years later.
Why the installer matters as much as the product
Even the best upvc windows or aluminium windows can underperform if the installation process is rushed. Poor fitting causes draughts, condensation and higher energy bills, no matter how good the material’s specification looks on paper.
At Sandymount, our team of window fitters, backed by years of experience, gets the small details right. It’s this attention to detail that keeps a your home looking good for years to come.
Check for the right accreditations
Accreditations matter because they show an installer has been checked against recognised standards, rather than simply taking their word for it. They’re one of the quickest ways to judge whether a company is genuinely reputable before you go any further. Look out for:
- FENSA registration – certifies that new windows and doors meet current building regulations
- Glazing Federation membership – a recognised standard within the double glazing industry
- British Fenestration Rating Council energy ratings – lets you compare thermal performance rather than take a salesperson’s word for it
Do you need a FENSA certificate for new double glazing?
Yes. New windows and doors must meet building regulations, and a FENSA certificate is the paperwork that confirms that yours comply. It’s a legal requirement, not just a nice extra, and you’ll need it as proof of compliant work if you ever sell your home.
Local installers versus national companies
A local installer often means shorter waiting times, one point of contact and personalised customer service right through installation. It’s a unique solution for your home, rather than the more standardised approach larger national companies tend to take with installation projects.
Ask about guarantees before you commit
A solid guarantee is one of the clearest signs of a company confident in its own product quality. Ask what’s covered, for how long and who honours it if the original installer stops trading. We’re proud to say our Origin windows and doors come with a 20-year guarantee.
Read customer reviews
Customer reviews on Google and social media channels tell you more than any brochure. Word of mouth counts too, so ask friends or neighbours who’ve had similar work done recently. Look for mentions of great service, tidy site work and past customers who’d happily use the company again.
You can see our own customer reviews and browse past projects on our website before you get in touch.
Watch out for sales tactics
The cheapest option rarely reflects genuine product quality, so be wary of pressure to sign on the day or discounts that “expire tonight”. A trustworthy double glazing installer gives you time, a clear quote and straight answers, not a script. At Sandymount, we offer a free quote and consultation, with no pressure to decide there and then.
Questions to ask a double glazing installer before you commit
- How long have you been trading and can I see recent local reviews?
- Are you FENSA registered and what guarantee comes with the installation?
- What frame materials and window styles do you offer?
- Who carries out the fitting, your own installers or subcontractors?
- What happens if something needs adjusting once the job is finished?
Why homeowners choose Sandymount
We have over four decades of building and installation experience behind every project, backed by FENSA registration. We manage the whole installation process ourselves rather than passing it to subcontractors, so the team who measures your windows is the team who fits them.
Choosing the right double glazing company means choosing peace of mind: a straightforward process, honest advice and a finished job you’d happily recommend to a neighbour.
Get in touch with our team today for a free, no-obligation quote on your new windows or door products. We’re happy to talk through frame materials, window styles, guarantees with honest advice and no sales tactics.
