Based in Andover, Hampshire, KJM serves homeowners across Hampshire and surrounding parts of Southern England, including Marlborough, Winchester, Basingstoke, Newbury, Salisbury and Southampton.
KJM Group Andover & Hampshire
KJM Group is an independent, family-owned home improvement company based in Andover, Hampshire. Established in 1982 and incorporated in January 1983, KJM specialises in the supply and installation of windows, doors, conservatories, extensions and associated home improvement products across Hampshire and Southern England.
The company is led by owner and Managing Director Mark Pearce, who joined KJM in 1983 and has more than four decades of hands-on experience across installation, manufacturing, sales and business management.
KJM Group at a Glance
| Established | 1982 |
| Incorporated | January 1983 |
| Based | Andover, Hampshire |
| Owner & MD | Mark Pearce |
| Mark joined KJM | 1983 |
| Current team | 30+ employees |
| Specialism | Windows, doors, conservatories & home extensions |
| Service area | Hampshire & Southern England |
1982 - The Business was Founded
KJM were incorporated in January 1983, the name comes from the founding directors Ken Hammant, John Creasey and Mick Burrell. We began manufacturing uPVC windows and doors from our Andover base and were soon selling our products around Hampshire.
1983 - Today's MD Was Appointed
Mark Pearce joined the KJM team initially as an installer and then worked in our factory manufacturing Veka windows. Mark progressed through the company and ended up as sales manager.
1996 - The Year of Change
KJM had enjoyed much success from the start, but manufacturing made it difficult to offer a broader portfolio of glazing products. Prospective customers started asking for aluminium and timber fenestration, so the decision was made to stop manufacturing.
2010 - New Owner
Mark took over KJM and became the sole owner of the company. The ethos established by the original team continues today, with a focus on high-quality products, professional installation and exceptional customer service.
Award Era 2011 - Present
Since 2010, KJM Group has received industry recognition for customer service and installation quality, including being named Which? Trusted Trader of the Month on multiple occasions and receiving recognition for conservatory and home extension projects.
New products - Introduced
Over the last 16 years (2010–2026), KJM Group has significantly evolved its product offerings, mirroring the wider glazing industry’s shift away from basic “white uPVC and polycarbonate” towards highly energy-efficient, premium, and architecturally focused home improvement solutions.
About KJM
The company was incorporated in January 1983, with the name KJM derived from the founding directors Ken Hammant, John Creasey and Mick Burrell. Originally manufacturing our own windows on West Portway Industrial Estate in Andover, the company concentrated on uPVC windows as we were unable to manufacture anything else. In these early years, KJM won some substantial commercial contracts.
Over time the economics of manufacturing on a relatively small scale proved not to be cost-effective and, with many new materials becoming available, and customer trends requiring a more diverse range of products, we ceased manufacturing in 1996.
In 2010, Mark Pearce became the sole owner of KJM Group. Under his leadership, KJM has continued to develop its range of windows, doors, conservatories and home extensions while retaining its focus on quality installation, customer service and a no-pressure approach. Today KJM employs more than 30 people and serves homeowners across Andover, Hampshire and surrounding areas, offering uPVC, aluminium and timber windows and doors alongside conservatories, extensions, conservatory roofs and related home improvement services.
VIEW OUR WINDOWS
The KJM difference
No pressure
- No hard-selling or “buy tonight” tactics. See our no pressure promise
Experienced people
- A team containing people with decades of experience in installation, manufacturing, sales and customer care.
Independent business
- KJM is owned and managed by Mark Pearce, who joined the business in 1983 and became its sole owner in 2010.
Long-term relationships
- KJM has maintained customer and commercial relationships over many years.
Award Winning
- We have been Which Trusted Trader of the month twice and won an award for our glazed extensions to name a few
No Pressure Promise
At KJM Windows & Conservatories, we pride ourselves on our no hassle, no pressure approach to providing high-quality home improvement products to the thousands of customers who have put their trust in us since 1983.
It is our experience that the last thing our customers want is a high-pressure sales person in their home, especially when they will not leave until they have ‘got the order’. Consequently, we at the KJM Group have a ‘No Pressure Promise’ to guarantee that if we are invited into your home, we will not employ any hard sell tactics and will leave immediately the moment anyone feels uncomfortable.
It’s the main reason that none of KJM’s sales staff are commission based. Most of our quotations require us to leave your property WITHOUT providing you with a quotation. You will be emailed or posted your full written quotation for you to peruse at your leisure. If you want to know more about our no pressure promise, don’t hesitate to contact us today.
Find out more
KJM supplies and installs:
What KJM Does
- Windows — uPVC, aluminium, timber and specialist window systems
- Doors — composite, aluminium, timber, uPVC, bifold, patio and heritage-style doors
- Conservatories — bespoke and traditional conservatories
- Home extensions — including lightweight extension systems
- Conservatory roofs — glass, tiled and solid roof systems
- Garage doors – wide range of door styles and operations
- Glazing and energy-efficiency solutions – triple glazing specialists
Meet The Team
The people behind KJM
KJM is a team of more than 30 people, including experienced installers, surveyors, sales consultants, service engineers and building specialists. Several members of the team have been with the company for many years, giving KJM an unusually deep level of accumulated practical experience.
Andy – Installer — with KJM from inception
Kerry – Service Engineer — joined 1987
Mark – Managing Director— joined 1983
Over Four decades of hands-on industry experience
KJM’s expertise has been built from practical experience rather than simply from selling home improvement products. Mark Pearce joined KJM in 1983 as an installer and subsequently worked in manufacturing, became factory manager, moved into sales and management, became a director and ultimately took ownership of the business in 2010.
This experience spans installation, window manufacturing, product selection, sales, customer service and business management. Read Mark Pearce bio
Mark Pearce
Managing Director
Joining KJM in 1983, Mark runs KJM as Managing Director and owner with vast experience in the Management and Sales industries.
Paul Ginger
Sales Manager
Working alongside Charles Flint and Paul Williams, Paul leads the sales team with his experience as a previous fitter for KJM.
Andy Turner
Installer
Andy has been with KJM from its inception. He is therefore one of our most experienced installers.
Charles Flint
Sales Consultant
Charles Flint joined the sales team after six weeks working with the installation teams, gaining invaluable knowledge and experience.
Kerry Bergin
Service Engineer
Kerry joined the company in 1987 and worked in manufacturing for nine years. He is now also the company’s Service Engineer.
Anthony Crean
Builder
Anthony is the head of our building team and will be the first worker you will see on-site if you buy a KJM conservatory.
So happy with our new windows and doors installed by KJMs extremely professional and crafted engineers; Paul, Lennon & Kerry.
From the very start, Charles worked patiently with us ensuring we had the right product for replacing our cottage’s windows and doors.
Next Andy ensured everything was made to measure correctly and added the touches that took the look from great to stunning.
Engineers Paul & Lennon installed the products with care and clearly they have a high level of craftsmanship.Kerry finished off the stress free process with the final tweaks needed when fitting a high quality product into a 209 year old cottage. And last but not least, Simon’s expert eye ensuring nothing was missed.
Thank you to all involved. We are very very pleased with the service and products from KJM and would definitely recommend them.
Jo Morrell
SouthamptonWe had a wonderful and stress free experience having all our windows replaced, from the initial meeting & quote to installation.
Everything was delivered as promised and on time.
There were very various options available to us, but at no time was there any hard selling, just genuine recommendations on what would be best for our needs.
Installation was completed in 2 days and the fitters were polite, courteous and left the house clean and tidy after they had finished.
We can highly recommend KJM for their customer service, pricing and delivering what was expected without any fuss hassle or delay.
John Hyde
BasingstokeOur third time using KJM and would still highly recommend! The whole team from sales to survey to install to payment are very polite and a pleasure to deal with. The install guys were especially good, turned up on time, explained everything that was happening each day, asked questions rather than making assumptions, worked very hard and cleaned up after themselves. This was phase 1 on our current house and we’ll be back for phase 2 as soon as we’re ready!
Alex Leung
WinchesterFrom start to finish, the team delivered outstanding workmanship and professionalism. The attention to detail on our windows and door replacement was exceptional — perfect sealing and everything operated smoothly on first use. They protected floors and furniture, worked neatly, and left the areas immaculate.
What really stood out was how considerate they were when a neighbour raised a concern. They handled it calmly and respectfully and genuinely felt they cared.
They also went the extra mile by fitting a cat flap in our new door which was really convenient and kind.
Professional, punctual, tidy, and genuinely thoughtful — I’d recommend them without hesitation.
Thanks everyone so much!
Tabitha Blake
AndoverChosen on recommendation and they didn’t disappoint. A local company with excellent values and a personal service. From the initial visit and assessment with Charles to the fitting by Paul and Lennon, the service was excellent. People that know what they are doing and go the extra mile to look after your home as if it was their own.
The products are top quality and we couldn’t be happier with the finish. On completion Simon was on hand to listen to our feedback and take on board our reflection of our experience. Thank you all, we would 100% recommend you.
Lisa Taverner
WinchesterWhat can I say. From start to finish these guys have been absolutely amazing. From the quote, measuring, pre-work through to installing the new windows & doors, everyone has been great.
Josh, Jordan & Shay who did the installation were fabulous. Incredibly hardworking, polite, friendly, and tidy. Can’t recommend them enough. Thank you KJM for a stress free week.
Maggie Crosby
HampshireI’ve used KJM for a few replacement and new windows/doors over the years. Their service has always been great, particularly any after sales/maintenance required. I’ve recently had a replacement window fitted and I was blown away at the professionalism of the fitters.
Charlie, Ryan and Peter were so polite, considerate and tidy throughout the fitting. The first thing they did was put down floor protection and dust sheets from the entrance to where the window was being fitted, the last thing they did was sweep the area outside where they were working. I dare say the area was tidier after they left than it was beforehand! They truly are a credit to the company and are more than I could hope for from a local business.
Archie Sturt
AndoverHad a great team today fitting new conservatory doors as well as a new front door. Lesley and Liam, a father and son partnership did an amazing job.
Firstly the conservatory doors look amazing, they are new doors fitted to a 28 year old conservatory! The result is outstanding, so a big shout out to KJM, Lexter & Liam.
The front door looks classy, a great new addition to the house.
We are so pleased with the result and would highly recommend KJM, and if you are lucky enough to get Lester & Liam you are in safe hands.
A very satisfied customer!😊
Lisa Wearn
HampshireOur Accreditations
Throughout our business history, we have been delighted to receive several accreditations, awards and partnerships in our fields. We have installed many large projects for clients such as Winchester City Council, Peverel, RLHA, Grainger PLC and The Diocese of Winchester.
KJM is recognised through organisations and schemes including Which? Trusted Traders, Checkatrade and FENSA.
Which?, Checkatrade and FENSA
Contact Us
We proudly offer various products and services for our customers and homeowners around Andover and Hampshire. If you want more information on our services or a quote, contact us today using our contact form, and we will endeavour to respond as soon as possible.