Endorsed by Which?

KJM Windows and Conservatories

4.9

86 Reviews

Opening Hours
Today - 09:00–17:00
  • Monday 09:00–17:00
  • Tuesday 09:00–17:00
  • Wednesday 09:00–17:00
  • Thursday 09:00–17:00
  • Friday 09:00–17:00
  • Saturday 09:00–14:00
  • Sunday - Closed

Organisations and Awards

FEBRUARY 2024

About

KJM Windows and Conservatories an multiple award winning company were formed in 1983. Over the years KJM has become a well established and a reputable glazing company, which has gained the trust of thousands of home owners and businesses alike! To date we have installed over £90,000,000 of glazing products. Our diverse range of materials gives you the options that you require. We don't just sell PVCu, but offer timber and aluminium as well. This is backed up with a comprehensive 10 year warranty (insurance backed) that has a proven record. We have many accreditations, including G11, G13, G14 and G15 Installer of the year finalists, Glass and Glazing Federation (GGF) members, Hampshire Trading Standards approved and of course Which? Trusted Traders. Sales calls are free, without pressure and our pricing is competitive. There is no hype or special "buy one get one free" offers, just good honest pricing. Give us a try, you wont be disappointed.

What we do

  • Glaziers

    • Double glazing installation
    • Timber windows
    • Sash windows
    • Window consultants
    • Aluminium Windows
    • Double glazed units
    • Double glazing repair
    • Replacement window services and repairs
    • Stained glass
    • Triple Glazing
    • UPVC Windows
  • Conservatories

    • Hardwood conservatories and orangeries
    • Sun Lounge
  • Doors

    • Patio doors
    • Timber doors
    • Bi-fold doors
    • ​Aluminium doors
    • Composite doors
    • Front door
    • French doors
    • UPVC doors
    • Door repairs
    • Orangeries

Customer reviews

Why you can trust these reviews

All reviews are verified as being genuine and a true customer of this trader.

How can we be so sure?

100% of the reviews we publish have been through our stringent moderation process.

4.9
86 reviews
Customer Service
4.9
Quality
5.0
Value
4.9
Sort by
Front door and 10 windows replaced
Customer Service
Quality
Value
We are extremely happy with the work that all of the team at KJM carried out recently, from the initial contact, right through to completion. As well as the windows and door being replaced, we also needed to have a lintel fitted. Colin did a fantastic job with this including a perfect match for the bricks. The rest of the team, Lester, Shae, Andy and Liam worked tirelessly and did a brilliant job. They were all very polite and friendly. Nothing was too much trouble. Simon, who was the Site Manager, visited regularly throughout the works and any issues we had were completely resolved and any questions we had were answered. The works were carried out on budget and within schedule. We would thoroughly recommend anybody to use KJM and we would not hesitate to use them again in the future if needed.
Customer in Hampshire Posted on 21/11/2025 , work completed 16/10/2025
Great product and service
Customer Service
Quality
Value
We had KJM install some heritage black critical style windows and doors for a ground floor extension. Mark came out and worked out specific heights etc. with the builder to ensure the final looks was what we were after. Installation was a breeze and the guys were lovely to deal with. We also had some white pvc windows on another area of the house. The only down side now is that we need to get the other white pvc windows replaced by KJM as theirs are noticeably better than our existing ones! Great company and would highly recommend.
Customer in Hampshire Posted on 12/11/2025 , work completed 19/09/2025
The trader replied (on 14/11/2025)
Thank you for taking the time to provide us with a Which? review, it’s very much appreciated. I’m really sorry you might have to upgrade the rest of your windows! The heritage doors look great. Thanks again, all the team at KJM.
Extension
Customer Service
Quality
Value
This was the first time we’ve used KJM and they done an excellent job as I knew they would do from the moment Paul came out to do the estimate. All tradesmen worked in a clean and tidy fashion and were polite and considerate at all times, even our neighbours commented on how polite and considerate they were. Everything that was on the very detailed schedule of work was carried out to an excellent standard. I wouldn’t hesitate in recommending them. I will definitely be using them again and will not even waste my time looking elsewhere. VERY HAPPY, GREAT JOB! Thank you everyone at KJM.
Customer in Hampshire Posted on 08/11/2025 , work completed 12/09/2025
The trader replied (on 12/11/2025)
Thank you for taking the time to provide us with a 5* Which? review. I am really pleased to see that you were happy with all the team, would recommend us and importantly use us again! All the team at KJM
Changing misted double glazed units
Customer Service
Quality
Value
Changed 4 double glazed units. One under warranty, 6 years into a 10 year guarantee, the rest for windows not installed by KJM. No quibbles on the guarantee. Remedial done to fit in with my work schedule. Efficient and friendly service. Would not hesitate to recommend.
Customer in Wiltshire Posted on 19/05/2025 , work completed 19/05/2025
The trader replied (on 28/05/2025)
Thank you for taking the time to review KJM's warranty and aftersales service. I am happy to see that you would recommend us. Mark and all the team at KJM
Brilliant!
Customer Service
Quality
Value
Called KJM this morning regarding a broken door (not a KJM door). Attended my property very quickly and fixed the problem. Service was outstanding and professional . Great customer service, would highly recommend!
Customer in Hampshire Posted on 09/05/2025 , work completed 09/05/2025
The trader replied (on 28/05/2025)
Thank you for providing a glowing 5* review regarding our customer service. We are pleased that we could help. Mark and all the team at KJM
Great aftercare
Customer Service
Quality
Value
Kerry arrived on time, was friendly and efficient and did a great job. I would definitely recommend
Customer in Wiltshire Posted on 22/04/2025 , work completed 22/04/2025
The trader replied (on 28/05/2025)
Thank you for taking the time to review the service Kerry provided. Friendly and efficient are words I like to see. Mark and all the team at KJM
Window replacement and conservatory new fixed roof and windows plus external doors. Great service and workmanship.
Customer Service
Quality
Value
A great company with very customer-centric staff, from the sales team to the project manager and window fitters. Excellent workmanship, clean and tidy and friendly. Good quality products, we are very happy with the finished product. Delays with suppliers was dealt with professionally with great communication. Delays were also recompensed fairly. We would recommend using this company for all your windows, doors and conservatory changes.
Customer in Hampshire Posted on 30/01/2025 , work completed 20/12/2024
The trader replied (on 31/01/2025)
Thank you for taking the time to review KJM. It’s great to see the sentence “Excellent workmanship, clean and tidy and friendly” We always strive to be the best in the industry, thank you again Mark and all the team at KJM
KJM Andover window installation
Customer Service
Quality
Value
As a Commercial Construction Project Manager I cannot recommend highly enough the service and window installation that KJM carried out on my home. From initial enquiry to completion, their communication and service was exemplary. The final product installation was spot on. Very happy and am instructing them to now install external doors.
Customer in Hampshire Posted on 23/01/2025 , work completed 30/11/2024
The trader replied (on 31/01/2025)
Thank you for the 5*Which review? I am so pleased to see that you rate KJM from the beginning to the end. It’s great too see that all the staff work with the same ethos. Thank you again, Mark and all the team at KJM
New doors, new windows and a new solid conservatory roof
Customer Service
Quality
Value
I recently used KJM to have all the external doors and windows replaced in my home and to have a solid roof installed on an existing conservatory. From start to finish, they have been absolutely outstanding. No pushy sales and no complaints when making changes to the styles of doors and windows we wanted and we made lots of changes. Communication was brilliant and I was kept up to date on a regular basis (particularly as I had the works done over December and January and weather was a concern). The teams who undertook the work were excellent and very hard working often working in very cold conditions. Every evening they would clean up and leave everything spotless. Windows were changed without a need to redecorate. Doors and lovely and work faultlessly. The new conservatory roof has made such a difference and I now have a room I can use. They even came back and spent several hours cleaning the entire conservatory inside and out. All the staff are outstanding and really friendly and the quality of the work cannot be faulted. I couldn't be happier with the results.
Customer in Wiltshire Posted on 21/01/2025 , work completed 21/01/2025
The trader replied (on 23/01/2025)
Thank you so much for taking the time to provide KJM with a Which? 5* review, it is very much appreciated. It is so pleasing to see that the entire KJM team worked to the very highest standards. Thank you again Mark & all the team at KJM
Installation of new front door
Customer Service
Quality
Value
The work was to remove our front door and to replace it with a made-to-measure high-grade composite item. Our fitter, Andy, was really very good. He arrived slightly early, which was totally OK and took the expected time to do the work. Installation was straight forward and he was neat, quick, professional and very friendly. It was a pleasure having him in the house. The product was exactly as ordered and the cost was exactly as quoted. It exceeded our expectations. The service included disposal of the old door, all parts to be recycled it seems - another positive. The work was inspected by a surveyor as soon as it was completed, enabling us to talk about how we found the service - another significant positive.
Customer in Hampshire Posted on 17/01/2025 , work completed 17/01/2025
The trader replied (on 21/01/2025)
Thank you for taking the time to provide KJM with a Which 5* review. I am pleased to read that we exceeded your expectations. Thank you again Mark and all the team at KJM