Timber alternative windows installed in a Hampshire home
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Trading Since 1983 • Which? Trusted Trader • No Sub-Contract Fitters

Andover & Hampshire Home Improvements: Windows, Doors & Conservatories

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Derek Davis
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Appointment made for a faulty locking mechanism to be fixed on a double glazed window. This was fixed within 30 minutes of the engineer arriving. Service was quick and efficient. The only downside to the whole process was that we were given a time of mid-morning and the engineer arrived at 8:55 so a little embarrassing as we were not up thinking of a time of around 10. Having said that the service was excellent.
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Mrs Taylor
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We were recommended KJM Windows by someone in our neighbourhood who had recently had their windows replaced, and we’re so glad we took their recommendation! From our very first contact with Charles in Sales, he was fantastic at guiding us through the different options and quotes, making the whole process clear and straightforward. Andy and Kerry, who carried out the survey and technical work, were incredibly knowledgeable, thorough and accommodating, taking the time to make sure everything was carefully considered and explained. Emma, the Installation Coordinator, was brilliant from start to finish. She kept us regularly updated, was always quick to respond to any questions, and her excellent communication meant we never had to chase for an update. A huge thank you to Zack, Lester and Shae, who did a fantastic job with the installation. They were friendly, polite and professional throughout, always punctual and incredibly tidy. They were a real pleasure to have at the property, and we couldn’t have asked for a better team. They also deserve a special mention for their excellent choice of radio station! Simon was also fantastic in making sure that any issues were dealt with promptly and efficiently, and that everything was finished to an exceptionally high standard. His attention to detail and commitment to ensuring we were completely happy with the finished result were greatly appreciated. From our very first contact to the completion of the installation, everyone at KJM has been incredibly helpful, informative and professional, without ever making us feel pressured or rushed. Overall, we couldn’t be happier with the experience, the quality of the workmanship and, most importantly, the fantastic team behind it. Everyone we dealt with genuinely went above and beyond to make the whole process straightforward and stress-free. We would have no hesitation in recommending KJM Windows to anyone considering new windows. A truly fantastic company with an excellent team from start to finish.
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Alison Kukla
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We chose KJM to fit our doors and windows based on excellent feedback from our immediate neighbours. We were not disappointed. The whole process from start to finish went very smoothly and the surveyor and sales team were extremely helpful and patient while we fine-tuned the specifications. Zack, Lester and Shae did an amazing job of installing our 8 windows and 2 doors, which have vastly improved the look of our house. We wouldn't hesitate to recommend KJM.
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Claire Jones
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From the very start requesting a quote all the way through to completion of installation everyone at KJM has been so helpful, polite and knowledgeable. The installation team worked so efficiently in a tidy manner and have completed the work to an exceptional standard. We are so pleased with our new conservatory roof and so happy that we supported a local business who were excellent in every aspect. Fully recommend KJM. Thank you 🤩
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Jane Stewart profile picture
Jane Stewart
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What an amazing company .Had a small emergency and they came round straight away and dealt with it .couldn’t believe the quality of their work and their knowledge. Thank you so much guys.xxx Wouldn’t use anyone else now.
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Tim Whiteside
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Can't fault kjm from start to finish. They were very professional. Josh came out in 15 minutes to assess the problem and order the part needed then Kerry came out at the specified time and it was all done within 20 minutes. Window fixed and a very efficient job. We will definitely use them again if the need arises
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Jessica Gossage
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Total house replacement windows, front door and aluminium garden doors fitted this week. The reason I chose KJM was because the initial approach was friendly, efficient and organised. Thank you Charles for making the choices and ordering a good experience. Charlie and Ryan were fantastic fitters, punctual, polite, friendly and have done a really fantastic job. Simon appeared on site every day to check on progress and quality and spent time once the windows were in checking the finishes and noting any snagging required. Been the best experience all along. THANK YOU.
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The Hamilton's
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We couldn't be happier with our new windows and doors from KJM Windows & Doors! Over the summer, we had all of our windows and doors replaced with uPVC windows and beautiful agate grey composite doors. We also had French doors fitted where there was previously a window, which has completely transformed the space and made such a difference to our home. It was a big job, and we got quotes from several other companies before choosing KJM. Their price was very reasonable, and looking back, we'd choose them again in a heartbeat. From start to finish, the service was outstanding. Charles was brilliant during the quoting stage—knowledgeable, helpful, and never pushy. The office team kept everything running smoothly and were always friendly and responsive. A special thank you to Zac and Lester, who carried out the installation. They were incredibly polite, friendly, hardworking, and took real pride in their work. Their attention to detail was second to none, and they left everything clean and tidy each day. Finally, Simon's quality control visit really showed KJM's commitment to getting everything perfect. The whole team has been fantastic, and the finished result has exceeded our expectations. The quality of the windows and doors is excellent, and we genuinely couldn't be happier. We would thoroughly recommend KJM Windows & Doors to anyone looking for high-quality products, reasonable prices, and exceptional customer service.
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£100 Million Installed

Since 1983, we have installed over £100 million worth of home improvements across Hampshire. We are built to last.

25,000+ Installations

Thousands of local homeowners have trusted KJM. We don't just claim to be reliable; the data speaks for itself.

Which? Trusted Trader

We hold a near-perfect 4.9/5 rating and were named "Trusted Trader of the Month" twice (Feb 2024 & Aug 2026) for our high standards.

9.87/10 Checkatrade

Based on 360+ reviews. Our customers rate us 9.92 for Reliability and 9.90 for Tidiness.

4.9/5 Google Reviews

With hundreds of genuine reviews, this consistency proves we deliver quality over decades, not just a lucky streak.

10-Year Warranty

Total peace of mind. All our installations come with a comprehensive, insurance-backed guarantee as standard.



No Pressure Promise

Since 1983, KJM Group has championed a ‘No Pressure Promise’ across Andover and Hampshire. Unlike many competitors, our design team is non-commissioned, meaning we offer honest advice rather than aggressive sales tactics.

We provide detailed, written quotations for you to review in the comfort of your own home at your own pace. There are no ‘sign on the day’ gimmicks or hidden clauses—just transparent pricing and the freedom to get back to us whenever you are ready

Why getting a quotation should not be a hassle

Trusted Home Improvements in Hampshire

Since 1983, KJM Group has been the go-to specialist for high-performance windows, doors, and conservatories across Andover, Winchester, and the wider Hampshire region. Unlike general builders, we focus exclusively on quality fenestration.

We offer a comprehensive range of materials to suit every property style:

  • uPVC Windows: Energy-efficient, A-rated casement and tilt & turn styles.
  • Heritage Timber Alternatives: The Residence Collection (R9) and Roseview Sash windows, approved for many local Conservation Areas.
  • Aluminium Systems: Slimline bi-fold doors and windows for modern extensions.
  • Hardwood & Timber: Sustainable, hand-finished wooden joinery.

Whether you are in Winchester, Basingstoke, Salisbury, or right here in Andover, our employed installation teams (no sub-contractors) ensure a perfect finish every time.

KJM Group employed window fitters installing double glazing in Hampshire

Our Range

The KJM Customer Promise

We don't just fit windows; we deliver a stress-free experience from quote to completion.

No Pressure Sales

We hate "hard sells" as much as you do. Our team are employed staff, not commission-only agents. We provide a detailed written quote and leave you to decide.

Expert Technical Survey

Before we manufacture anything, our senior surveyor visits to take millimetre-perfect measurements, ensuring your new products fit your home seamlessly.

Employed Fitting Teams

We do not use random sub-contractors. Our installers are directly employed, uniformed, and trained by KJM to meet our high standards of workmanship.

Tidy Home Guarantee

We treat your home with respect. Our teams use dust sheets, vacuum up after themselves, and remove all old materials and debris when they leave.

British Made Quality

We champion British manufacturing. Every window and door is custom-made in the UK to your exact specifications, ensuring superior quality.

Dedicated Aftercare

Our relationship doesn't end at installation. We have a dedicated service engineer to handle any adjustments or queries you might have in the future.

Request a Quote

Offering a no hassle, no pressure approach to our quotation, you can request a quote today to view whenever you need it.

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Contact Us

If you have any questions about our products or services, contact us today using the contact form, and we will endeavour to assist you as soon as possible.

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Smarts Visoglide Doors
Self Cleaning Glass Lantern Roof
Deceuninck Flush Casement Windows
KJM Home Installation
Composite Front Door
Smarts Aluminium Systems
Aluminium Window and Door Installation
Roseview Sliding Sash Windows

Product Gallery

Our extensive product catalogue covers everything from energy-efficient uPVC and sleek aluminium windows to high-security composite doors and tiled conservatory roof replacements.

At KJM Group, we believe seeing is believing. Choosing the right style for your home can be difficult from a brochure alone. That is why we have curated a gallery of our recent projects across Andover and Hampshire. Explore our installation photography to see the quality of our finish and find the perfect inspiration for your own home improvement project.”

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Testimonials

 

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Awards and Accreditations

Frequently Asked Questions

KJM Group has been trading since 1983. With over 40 years of experience serving Andover, Winchester, and the wider Hampshire region, we are one of the area's longest-established home improvement companies. This longevity provides you with security and peace of mind.

We directly employ our own installation teams. Unlike many competitors who rely on sub-contractors, using our own trained staff allows us to maintain strict quality control, ensure reliability, and provide a polite, professional service in your home.

Yes. We are fully accredited. KJM Group is a registered member of FENSA and the Glass & Glazing Federation (GGF). We are also Trustmark approved and a member of the Hampshire County Council "Buy With Confidence" scheme.

Yes, absolutely. We have a fully stocked showroom in Andover (Mylen Business Centre, SP10 3HR). We encourage you to visit us to see and feel the quality of our windows, doors, and conservatory/solid roofs before you commit.

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