Endorsed by Which?

KJM Windows and Conservatories

4.9

86 Reviews

Opening Hours
Today -
  • 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.

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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
Which? Local Review
Customer Service
Quality
Value
After a thorough evaluation of three competitive quotations for a conservatory, this firm was found to have both a superior specification and a price considerably lower than the others. The technically experienced Director who dealt with us throughout attended to every detail and the finished job was completed almost on schedule with no requirement for a return to fix problems. It was a pleasure to deal with the company.
Gordon, Winchester Posted on 01/10/2006 , work completed 01/10/2006
Attention to detail
Customer Service
Quality
Value
Installation of 2x sets of French doors. Despite issues arising during installation, their response and attention to resolving the issues was maintained throughout. Courteous engineers with an expansive knowledge of the product.
Robert, Hampshire Posted on 31/05/2018 , work completed 31/05/2018
KJM secondary glaze project
Customer Service
Quality
Value
Second time I've installed a secondary glaze and first time with KJM. Big project and very professional/pleasant. I'm very pleased with the quality of product and installation; hardly tell it's there after a week. All about heat retention, as a priority, not sound, and KJM worked with me on this. Both the install teams were v knowledgeable, efficient and tidy. Only downside is the lead times as v busy
Customer in Hampshire Posted on 07/03/2022 , work completed 07/03/2022
The trader replied (on 10/03/2022)
Thank you for taking the time to review KJM, we really do appreciate it. I am pleased to hear that we treated you well and can only apologise about the length you had to wait. The pandemic made us very busy with a very slow supply chain. Things have now improved and lead times are much lower. Thank you again
Great job
Customer Service
Quality
Value
From cutting a hole in the wall, to installing new French doors and then plastering the internal wall/doorframe. Everything was done efficiently by a friendly team who were great at tidying and cleaning up afterward. Really happy with the product and the workmanship.
Customer in Hampshire Posted on 31/08/2022 , work completed 16/08/2022
Extremely Satisfied
Customer Service
Quality
Value
Our requirements were discussed beforehand, the fitters were polite and courteous, the work is to a high standard and extremely satisfactory
Customer in Hampshire Posted on 01/08/2019 , work completed 23/07/2019
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
replacement windows
Customer Service
Quality
Value
very pleased with the work the guys from KJM did when fitting my new windows. They arrived nice and early as requested and straight away just got on with the job. They were very friendly and professional, as well as stacking up the removed windows and tidying up as they went along. The windows were fitted a lot quicker than I'd expected and I am very pleased with how they now look both inside and out. A job well done.
Customer in Hampshire Posted on 15/12/2018 , work completed 11/12/2018
Would Highly Recommend KJM Windows......
Customer Service
Quality
Value
We recently had our front windows replaced and a new front door fitted by KJM. Firstly, I would like to say what a lovely and honest guy Mark the owner is, he came and measured up and quoted us for the work originally and was very helpful and even adjusted our doors we weren't having changed and advised us on what replacement handle we needed to buy, at no cost to ourselves, what a star! I will say our quote was very competitive and the quality of our windows and door are amazing and we are so pleased. We had a problem with part of our door fitting due to a manufacturing fault, Mark came round personally and we had discussions and he went away and re-ordered the part in question and recitfied the situation. I am going to mark the company down by a point on Customer Service, as I feel they could have been a bit more proactive in updating us to what was happening between the point of ordering and fitting the windows and I had to chase them. I am fully aware of the current econmic situation and what businesses are up against but because of this, there is more than likely to be more waiting time and delays for the customer, so I then think it is even more imperative the customer is fully informed and updated at all times. This is my only slight niggle, otherwise it would have been full marks and it is definately full marks for Mark. All in all, I would not hesitate to recommend KJM, they are very honest and trustworthy and you will not be disappointed!Thank you Mark & Team
Customer in Wiltshire Posted on 30/11/2021 , work completed 15/11/2021
Tidy & Professional
Customer Service
Quality
Value
Roughly 3 weeks ago, had 5 windows and a door tended to by KJM Windows & Conservatories. Carl completed all work on time and to budget, he was very efficient, tidy & professional. Would recommend.
JohnL1 Posted on 25/06/2014 , work completed 25/06/2014
A Which? Trusted Traders staff member replied on behalf of the trader (on 22/06/2015)
Many thanks for taking the time to write a kind review of KJM Windows & Conservatories
Door replacement
Customer Service
Quality
Value
The door fitting was very efficient, tidy and really good standard. The fitter was very friendly and prompt, ensuring everything was in place and working before leaving. Initial quote process was thorough so no need for any follow up visit. Could have done with an earlier update between quote completion and fitting date.
Customer in West Berkshire Posted on 22/10/2019 , work completed 22/08/2019
The trader replied (on 11/12/2019)
Thank you for taking the time to review KJM. I am more than happy that your overall experience was a positive one. I will ensure that we try and improve the communication with regards fitting dates. Thank you again and Seasons Greetings. Mark and the KJM team
Great workmen
Customer Service
Quality
Value
My landlord sorted everything with kjm so I can only comment on the workmen that came out today, they are very respectful, funny and kind! They take pride in their work and make sure they clean up after themselves and they are very good around children, definitely highly recommended!
Customer in Hampshire Posted on 12/03/2022 , work completed 12/03/2022
The trader replied (on 25/03/2022)
Thank you for taking the time to provide us with a Which? review, it is very much appreciated. I am very pleased to hear that the fitters were respectful, kind and funny. I will check to see who they were :-) Thank you again Mark MD KJM Group Ltd
Beautiful windows
Customer Service
Quality
Value
We would highly recommend KJM to anyone. We had some issues with our window installation but the company went to great lengths to rectify them and gave us a personal service that was very reassuring. We will be using them again!
Customer in Hampshire Posted on 10/02/2019 , work completed 01/03/2016
Prompt and professional - 100%
Customer Service
Quality
Value
Work done was to replace a new patio door. Everything was carried out in total perfection, from office to workforce we were totally impressed and our new doors are simply great.
Peter, Hampshire Posted on 02/08/2019 , work completed 02/08/2019
Quick, reliable and brilliant work
Customer Service
Quality
Value
Really impressed with KJM - a brilliant experience from start to finish. From the initial visit and measurements to the installation work itself, the experience couldn’t have been better. The installation work was completed quickly and conscientiously, and the quality finish is superb. Very satisfied customers.
Customer in Hampshire Posted on 16/03/2021 , work completed 08/03/2021
Excellent installation
Customer Service
Quality
Value
KJM installed 4 windows and a new front door for us. Really everything was faultless. The quality of the products is great, the ordering process went smoothly, and the installation was first class Aiden and Josh were the installers. They worked well as a team, there was no redecorating required, they showed creativity in overcoming any issues in the fitting, and kept me informed at all stages. Everything was also very clean when they were done. Good job!
Simon in Hampshire Posted on 04/05/2022 , work completed 14/04/2022
The trader replied (on 25/05/2022)
Simon, thank you for taking the time to provide us with a Which? Trusted Trader review, it is very much appreciated. Its great to hear that the whole process from sale to product and installation is recommended. Thank you again
Excellent quality windows and work done on schedule.
Customer Service
Quality
Value
Excellent service from the word go, from quote to completion. Very competitive quote for good quality windows and a door. Whole house refitted with windows without fuss. Very comfortable with the style of delivery of service. Fitters were professional, friendly and neat and tidy. Fitted without fuss even on difficult areas and to schedule. A very professional service from a well established local Company. Highly recommended.
Customer in Hampshire Posted on 30/07/2023 , work completed 13/07/2023
The trader replied (on 02/08/2023)
Thank you for taking the time to provide KJM with what seems a perfect 5* review. It would appear as though the whole team have done what they are asked to do daily for the business, so as the MD I will make the review visible to the entire team and thank them for their continuing efforts. Thank you again from Mark and all the team at KJM.
Three comp doors fitted. First class experience.
Customer Service
Quality
Value
We had three doors replaced with comp doors. The customer service from start to finish has been exceptional. Honesty from the sales and surveying team, very clean and tidy fitting of the doors by 3 very happy chaps! They made sure we were 100% happy with everything before they left. It has been a pleasure dealing with KJM and we would highly recommend them. Costs were good and there were no hidden surprises.
Customer in Wiltshire Posted on 08/07/2024 , work completed 05/07/2024
The trader replied (on 10/07/2024)
Thank you for taking the time to provide KJM with a 5* review. Words like "exceptional customer service, honesty and clean & tidy" are what we all strive for. Thank you again Mark and all the team.
Excellent doors and service
Customer Service
Quality
Value
I recently had a front and back door fitted by KJM and can’t recommend them enough. From the advice given by Mark to the fitting of the doors by Charlie and Josh. The lads were so friendly and worked so well together and you can tell they both have pride in their work. The doors look fab and we are so pleased with them so thank you so much.
Val in Hampshire Posted on 20/04/2023 , work completed 07/04/2023
The trader replied (on 22/04/2023)
Val, thank you so much for taking the time to give KJM a review for your door installation. Josh and Charlie always seem to go the 'extra mile' with customers and seem well liked by many. It does not go unnoticed by me! Thank you again Mark and all the team at KJM.
Excellent work throughout.
Customer Service
Quality
Value
Many thanks for making such an excellent job of replacing the roof of our existing conservatory. After the initial quote, we were able to go with a representative to see a roof replacement in our area and we were very impressed with the work. We decided to use KJM for our roof. From start to finish they took over the project. Drawings and planning were all done on our behalf. All the various workmen liaised together very well and explained what they were doing at all stages. The existing floor was carefully covered, and the lights were fitted into the ceiling. All the site was cleared after the work and left neat and tidy. Plastering was included so we only needed to find a decorator. We are delighted with all the work and it has changed from a conservatory to a room which is part of the house. We would definitely recommend KJM if you are considering improvements of this type.
Customer in Hampshire Posted on 05/01/2024 , work completed 30/11/2023
The trader replied (on 15/01/2024)
Thank you for the comprehensive 5* about our service, work and the recommendation. As the owner of the business I cant be any more pleased that our staff follow the company ethos. Thank you again
Excellent service as always!
Customer Service
Quality
Value
I have been a customer of KJM for over 30 years and have had windows, doors and a conservatory in that time. The service has always been exemplary as has the quality of the products and pricing has always been more than fair. The latest visit was to replace some glass and the fitter was as always friendly, polite and professional. Also, KJM managed to schedule us in before Xmas - which was very much appreciated.
Customer in Hampshire Posted on 18/12/2024 , work completed 17/12/2024
The trader replied (on 20/12/2024)
Thank you so much for both being a customer of KJM for over 30 years and the lovely review. It is also just as nice to deal with customers that have been with you throughout your history with KJM. Season greetings to you. Mark and all the team at KJM.
Bay Window
Customer Service
Quality
Value
A professional Job from start to Finish. A great price. You will not regret using KJM Excellent time keeping. The window replacement happened ahead of schedule which was great.
Customer in Hampshire Posted on 21/02/2023 , work completed 19/12/2022
The trader replied (on 25/02/2023)
Hello from all the team at KJM. Thank you so much for taking the time to share your experience of using KJM, it is very much appreciated. 5* in every category is impressive! Thank you again
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
Professional
Customer Service
Quality
Value
Having dealt with KJM previously, we knew that they were reliable. The members of the firm all carried out their role in a professional and efficient manner. The installers got on with the job and left with no damage to window surrounds and very clean. Full satisfaction.
Malcolm, Hampshire Posted on 23/08/2018 , work completed 23/08/2018
Secondary glazing on 18th century cottage next to railway line
Customer Service
Quality
Value
KJM replaced old secondary glazing in six windows in my old cottage. The work was done quickly and to a high standard. Three of the upstairs windows were done in high spec acoustic glass, and this has definitely helped to deaden the noise from the trains. The work was done in one day, and the windows were left extremely clean and tidy. There was some replastering work needed on the reveals where the old glazing came out, but this was anticipated as we wanted a wider gap between the windows and the secondary glazing to improve acoustic and thermal performance. KJM gave me a good price, were efficient, and I am very pleased with the job.
Customer in Somerset Posted on 14/01/2019 , work completed 21/12/2018
Great service from KJM
Customer Service
Quality
Value
This was the first time we had bought windows and door for a property, so went in with only a basic idea what we wanted and needed. We had a few quotes from a few different companies, the first thing that stood out about KJM was the Sales Consultant Luke F. Luke appears to genuinely want to get the best deal for the homeowner and KJM, he explained the range of products and the pro’s and con’s of each and gave his personal opinion when I asked him to. He didn’t try to push a sale at any point and went away to work out a proper quote for the work we requested. The 2 gentlemen turned up bang on time on the day of install, and did the work to a high standard. They were careful around the house to make sure they didn’t make any mess or cause any damage. The install took a few hours and a full demonstration was given at the end. We are totally satisfied with the work and price we paid. I wouldn’t hesitate to recommend KJM to friends and family!
Customer in Hampshire Posted on 10/04/2019 , work completed 04/04/2019