KJM Windows and Conservatories has been awarded Which? Trusted Trader of the Month for August 2026.

Based in Andover, Hampshire, the company provides window and door installation and repair services across Hampshire, London, Surrey, Berkshire, Dorset and Wiltshire.

We spoke to Managing Director Mark Pearce to find out what’s behind the company’s continued success, how the business has evolved since its last win, and why trust remains at the heart of everything it does.

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Over 40 years in the making

Founded in 1982, KJM takes its name from the initials of its three founding directors. Over the past four decades, it has grown into a team of around 40 builders, installers and office staff.

Mark says the business has stayed true to its original purpose.

‘The "why" has always remained the same: to provide high-quality home improvements without the high-pressure, hard-sell tactics our industry is unfortunately known for. We wanted to build a business rooted in genuine customer service, where honesty and transparency come first.’

He also credits the company's long-serving employees for helping maintain consistently high standards.

‘A major factor in our success is our staff loyalty; we employ our own fitting teams rather than relying heavily on sub-contractors. Many of our team members have been with us for decades’

This is KJM's second Which? Trusted Trader of the Month award, having previously won in February 2024. Since then, the business has continued to adapt to homeowners' changing priorities.

‘Since February 2024, we’ve continued to adapt to the changing needs of homeowners, particularly regarding the cost of living and energy price cap surges we've seen recently,’ said Mark.

‘We’ve been heavily focused on educating our customers and installing high-efficiency products like triple glazing and advanced solar protection to help them future-proof their homes.

‘We have also stepped up our community involvement. A recent highlight was sponsoring the 2026 Andover Soapbox Derby, keeping entry free for the 3,500+ spectators, and raising over £6,000 for Raising Twenty1, a brilliant local charity which supports children with Down's syndrome.’

The company also supports numerous local sports clubs and community groups.

‘Beyond that, our core focus remains exactly what won us the award in 2024: maintaining our near-perfect ratings across Which?, Google, and Checkatrade by consistently putting the customer first,’ said Mark.

A no-pressure approach that stands out

A standout feature of KJM is its ‘no-pressure promise’, something one of our judges noted as ‘a clear point of difference which is reflected consistently across the customer journey’.

Rather than relying on time-limited offers or sales tactics, KJM focuses on clear pricing and giving customers the space to make informed decisions.

‘We don’t do gimmicky buy-one-get-one-free offers, fake interest-free credit, or price drops if you "sign today”. We provide a full, written quotation for the prospective customer to review at their leisure,’ said Mark.

‘I am incredibly proud of our “no-pressure promise” and the integrity of our staff. The ethos of customer service truly runs from the very top down to every single team member. All of our office staff are employed directly, and our sales team is fully salaried, not commission-based, meaning they are working to find the right solution for the customer, rather than just chasing a signature for a paycheck.

‘Hearing that over 80% of our work comes from recommendations or returning customers is the ultimate source of pride - it tells us we are doing things the right way.’

Which? Trusted Trader endorsement brings reassurance

KJM has been a Which? Trusted Trader for more than 17 years. According to Mark, the endorsement has become an important source of reassurance for customers, particularly those outside the company's local area.

‘The glazing industry has historically suffered from a tarnished reputation,’ he said.

‘While KJM has enjoyed a strong, trusted reputation locally since the 1980s, we found that customers further afield - who might not be as familiar with our brand - needed extra reassurance.

‘Customers absolutely appreciate the certification. The Which? brand is synonymous with being the UK's consumer champion. Because Which? conducts such a rigorous audit - checking our financial health, assessing our administrative procedures, and interviewing past customers - homeowners know that our endorsement is earned, not simply bought. It gives them the total confidence they need to invite us into their homes.

‘My advice is to embrace the rigorous assessment process. It is a thorough audit, but that is exactly what gives the Which? badge its value. Don't look at it merely as a marketing tool; use it as a benchmark to assess and improve your own business operations.

‘If you are genuinely committed to reducing consumer detriment, operating ethically, and providing top-tier service, the Which? Trusted Trader endorsement is the gold standard that will naturally elevate your business and help you stand out in a crowded market.’

Congratulations to KJM Windows and Conservatories.

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