Choosing who to let into your home for a window or door installation is a big decision, and it is hard to know who to trust from a website alone. That is exactly why independent endorsements matter. Cristal Windows is a Which? Trusted Trader, and this page explains what that badge really means, how a business earns it, and why it is worth looking for when you compare installers.
Quick summary
- Which? has been testing products and services for more than 60 years, and the Which? Trusted Trader logo is a recognised sign of reputation and trust.
- The endorsement is assessed and administered by trading standards professionals, not bought off the shelf.
- Around one in four businesses that apply do not pass the assessment.
- The checks cover creditworthiness, insurance, terms and conditions and complaints procedures, plus a face-to-face interview at the business premises.
- References are taken from up to 10 past customers pulled from the trader’s own records, so the trader cannot choose who Which? contacts.
- Cristal Windows holds a genuine, current Which? Trusted Trader endorsement, alongside FENSA registration, 34 years of GGF membership and Rehau Authorised Partner status.
- Cristal Windows has a 4.9 out of 5 rating from more than 90 verified, moderated reviews on its Which? Trusted Trader profile, with 100% of customers recommending the business.
- If something goes wrong, customers have access to an independent alternative dispute resolution service.
What a Which? Trusted Trader actually is
Which? is the consumer champion many people already know from its Best Buy recommendations. For decades it has tested products and services independently and without accepting payment to influence results. The Which? Trusted Traders scheme applies that same reputation to local tradespeople, endorsing businesses that pass a proper assessment carried out by its trading standards team.
An endorsement, not an advert
The badge exists to recognise reputable, customer-focused traders and to give homeowners a shortcut through the guesswork. A business cannot simply sign up and display the logo. It has to be assessed first, agree to a Code of Conduct, and keep meeting the standards to stay endorsed. In other words, the logo is a signal that an independent third party has already done some of the homework for you.
Not the same as an online review site
Plenty of homeowners feel they have done their due diligence once they have scrolled through a company’s online reviews. The trouble is that reviews are easy to fake and difficult to verify, and a glowing star rating tells you nothing about whether a business is financially sound, properly insured or fair when a problem arises. A Which? Trusted Trader endorsement looks behind the reviews at the business itself.
How Which? checks a trader before endorsing them
The assessment is designed and administered by trading standards professionals, and it is deliberately thorough. It is built to confirm that a business is legitimate, financially healthy and genuinely focused on its customers before it is ever allowed to display the logo.
The assessment process
Which? runs a credit report to check the financial health of the business, then examines its administrative and business procedures, including insurance, terms and conditions and how it handles complaints. A trading standards professional also carries out an interview, typically face-to-face at the business premises, to understand how the company really operates. Businesses receive a written report with feedback, and only those that meet the standard can join.
The reference check you cannot fake
This is one of the parts that sets the scheme apart. The assessor selects a number of the trader’s recent customers, usually up to 10 people who used the business within the previous 12 months, and contacts them directly. Crucially, those names come from the trader’s own order books and paperwork, so the business cannot hand-pick its happiest customers. The feedback reflects real jobs and real people.
Who does not make the grade
Because the bar is set high, not every applicant gets through. Which? reports that around one in four businesses that apply do not pass the assessment. The scheme is built around high quality rather than high numbers, which is part of what makes the endorsement worth something.
Five reasons the endorsement carries weight
If you are weighing up installers, here are five practical reasons the Which? Trusted Trader badge is a signal worth trusting.
- The scheme represents high quality rather than high quantity. Not every business that applies is accepted, and roughly one in four do not make the grade.
- Reviews on the Which? Trusted Traders website go through a moderation process, and genuine reviews are not removed whether they are positive or negative. That lets you build an honest picture of how a trader treats its customers.
- The assessment is designed and administered by trading standards professionals and looks at creditworthiness, insurance, terms and conditions and complaints procedures.
- A standard assessment includes a face-to-face visit and interview at the trader’s own premises, so the business is seen in person rather than judged on paperwork alone.
- References are checked with previous customers chosen from the trader’s records, which means the trader cannot influence who is contacted.
Why this matters when you are choosing a window or door company
Replacing your windows, doors or conservatory is a significant investment, and the quality of the installation matters just as much as the products themselves. When you gather quotes, you are effectively deciding which company to trust with your home and your money. An independent endorsement gives you a reliable reference point that goes well beyond a friendly sales visit.
The risk of an unvetted installer
An installer who has never been assessed by an independent body might still do good work, but you have no easy way of knowing. You cannot see whether the business is financially stable, whether its insurance and paperwork are in order, or how it behaves when a job does not go to plan. With an unvetted company, you are relying almost entirely on their own marketing and a handful of reviews you cannot verify.
What a genuine endorsement gives you
Choosing a Which? Trusted Trader means an independent assessor has already checked the business, spoken to real past customers and confirmed it meets a recognised standard. It does not remove the need to compare quotes and ask questions, but it does give you a solid, impartial starting point and a good deal more peace of mind.
What happens if something goes wrong
No homeowner wants to think about a job going wrong, but it is fair to ask what protection you have if it does. The Which? Trusted Traders scheme has a clear route built in, which is another reason the endorsement offers reassurance.
The complaints route
Every Which? Trusted Trader agrees to address complaints under the scheme’s Code of Conduct. A problem should be reported within twelve months of discovery, and the trader is then expected to acknowledge it and work towards putting things right. The framework sets out clear timescales for both sides, so nobody is left in limbo.
Independent dispute resolution
If a complaint cannot be settled directly, customers of a Which? Trusted Trader have access to an independent alternative dispute resolution service. This is provided by a not-for-profit organisation that helps mediate and resolve issues fairly, so you are not left to sort things out entirely on your own.
The Cristal Windows difference
Our Which? Trusted Trader endorsement is one part of a wider picture. We are a family-run double glazing company that has been supplying and installing windows, doors and conservatories for more than 40 years, and we hold several credentials that back up the standard of our work.
More than one badge
Alongside our Which? Trusted Trader status, Cristal Windows is FENSA registered, has been a member of the Glass and Glazing Federation for 34 years and is a Rehau Authorised Partner. Each of these speaks to a different aspect of doing the job properly, from building regulations compliance to long-standing industry membership and approved use of quality window systems. Our Which? Trusted Trader profile carries a 4.9 out of 5 rating from more than 90 verified reviews, with 100% of customers recommending us, and every review is independently moderated before it appears.
Local, family-run and no pressure
We are based in Fleet and look after homeowners across Hampshire, Surrey and Berkshire on a supply-and-install basis. Steve carries out surveys and quotes with a no-pressure approach, and the same familiar team, including installers Dennis and Robbie, sees the work through. If you would like to talk to a Which? Trusted Trader about your project, you can get in touch for a free, no-obligation quotation.
Our recommendation: When you are collecting quotes, ask each company whether they hold a genuine, current Which? Trusted Trader endorsement, then check them on the official Which? Trusted Traders website. It is a quick way to separate businesses that have been independently vetted from those that have not. You can see our own record, including more than 90 verified reviews, on the Cristal Windows Which? Trusted Trader profile.
Frequently asked questions
Q. What is a Which? Trusted Trader?
A. A Which? Trusted Trader is a business that has passed an endorsement assessment run by Which?, the consumer champion that has been testing products and services for more than 60 years. The endorsement is carried out by trading standards professionals and is a recognised sign of reputation and trust. Cristal Windows holds a genuine, current Which? Trusted Trader endorsement.
Q. How does Which? decide who becomes a Trusted Trader?
A. Which? assesses each business through a process designed and administered by trading standards professionals. It checks creditworthiness, insurance, terms and conditions and complaints procedures, includes a face-to-face interview at the business premises, and takes references from past customers drawn from the trader’s own records. Around one in four businesses that apply do not pass.
Q. Is a Which? Trusted Trader better than an installer with lots of online reviews?
A. Online reviews can be helpful, but they are easy to fake and hard to verify. A Which? Trusted Trader endorsement is different because an independent assessor has checked the business itself and contacted real customers chosen from the trader’s own paperwork, so the results cannot be influenced by the trader.
Q. Is Cristal Windows a genuine Which? Trusted Trader?
A. Yes. Cristal Windows is a current Which? Trusted Trader, and our endorsement can be checked on our profile on the Which? Trusted Traders website, where we hold a 4.9 out of 5 rating from more than 90 verified reviews with 100% of customers recommending us. Alongside this endorsement we are FENSA registered, have been a member of the Glass and Glazing Federation for 34 years and are a Rehau Authorised Partner, with more than 40 years of trading in Fleet and the surrounding area.
Q. What can I do if a problem comes up with a Which? Trusted Trader?
A. Which? Trusted Traders agree to address complaints under the scheme’s Code of Conduct. A problem should be reported within twelve months of discovery, and the trader is expected to acknowledge it and work towards a resolution. If it cannot be resolved directly, customers have access to an independent alternative dispute resolution service.
