What we can verify about KJM Windows and Conservatories
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Each card sums up one thing we can check from public sources. Open it for the full detail and the named source. This is evidence context, not a guarantee.
These reviews are published independently on the named public source below, not testimonials this business chose to show. We bring them together and link each one back to where it appeared, so you can open the source and read it yourself.
5.0out of 5
96 reviews in public evidence5 reviews in the last 12 monthsMost recent review
Customers often mention
Friendly & politeMentioned in 72% of reviews we've read
Tidy & cleanMentioned in 36% of reviews we've read
ProfessionalMentioned in 32% of reviews we've read
Where these reviews are published
Which? Trusted Traders96 reviews · 5.0 avg
Detailed reviews
These are the individual reviews we hold for KJM Windows and Conservatories, including the highlights above. The 96 headline total is the review volume reported across public review sources.
Customer in Greater London
Customer recommends this business
Amazing organised Company, who did an exceptional job
We have recently had 24 new Graf welded Deceuninck 2800 flush casements windows in agate grey, installed in our Andover Workshop and showroom. The transformation is amazing. The process from initial quote, to finalising details, site measure, manufacture to installation went incredibly smoothly without delay. The installation team worked through the extra hot weather without complaint and did a stunning job. I know window companies can get a bad press particularly when it comes to installation. I would not hesitate to recommend The KJM group to my clients.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
5* Would Highly recommend - Look nowhere else than KJM!
5/5 Stars – A Life-Changing Transformation! If you want exceptionally high standards and a trustworthy team, look no further than KJM. They recently built us a conservatory, and it is incredible. We used to have a rubbish garden room that leaked, was freezing, and looked horrible. Thanks to KJM’s brilliant design, we now have a stunning family room that is completely life-changing for us. The entire process was faultless from the initial sales visit to the final sign-off with Brian, who was a fantastic coordinator. Builders Michael and Ben were absolutely brilliant too, doing a fantastic, highly skilled job putting the frame up. But a massive shout-out goes to our brickies, Ant and Colin, who were the absolute stars of the show. I cannot praise them enough; they are the most friendly, kind, and hardworking people you could ever meet. Most contractors are incredibly disruptive, blasting radios and ignoring your routine. Not these guys. They were so deeply mindful of our working commitments and incredibly respectful of our neighbours. They just put their heads down and worked tirelessly, showing a rare level of pride in their craft. Having them on-site was a total pleasure. If I had to sum up KJM, they are: faultless, high-quality, professional, easy to contact, reliable, hard-working, and entirely trustworthy. If you want an exceptional design, a stress-free build, and a top-tier team, go nowhere else. Thank you, KJM!
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Neighbours Conservancy Build
I would like to recommend the professionalism of this building company, Ant & Colin (the bricklayers) who were so respectful and considerate about my work, which takes place in a lodge in my garden, they were flexible and considerate whilst I was working and accommodated this by keeping the noise down to a minimum when they knew I was in there. I was astonished by their professional and friendly approach whilst our neighbours were having a conservatory built. Highly, highly recommend this company!
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Wiltshire
Customer recommends this business
Extremely Professional Company
KJM has been coming to our site for many years. During that time they have installed new composite doors, guttering and facias. They have also supplied and built a large conservatory. The engineer who covers our area is always polite and professional and is trusted to work with older people. I wouldn’t use anyone else.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Working together
KJM just completed supplying and installing two patio doors on one of our projects in Reading, the job was completed on time ( both in one day) with little disruption to our customer who was so impressed with KJM. Thank you KJM for your great service as usual.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Read the other 15 detailed reviews on this pageShow fewer reviews
Customer in Hampshire
Customer recommends this business
Beautiful extension
A huge thank you to KJM for delivering an amazing extension for our home. From start to finish, the workmanship and attention to detail were fantastic. Brian and the entire installation team were professional throughout, always keeping everything clean and tidy as the project progressed. Even our neighbours commented on how respectful and hardworking the team were. Thank you all for making the whole project feel seamless and stress-free. We are absolutely delighted with the finished result and would 100% recommend KJM to anyone considering an extension or home improvement project.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Excellent windows, service and value
We had a wonderful and stress free experience using KJM. The customer service, quality, pricing and delivery was excellent. We had all our 8 windows replaced and from the initial meeting, quote and installation everything was delivered on time and as promised. There were various options to choose from, however at no time did we feel we were being upsold. There were just genuine recommendations as to what would be the most suitable for our needs - and we were left to decide. The installation was completed as scheduled within 2 days and the fitters, Josh, Shay and Jordan were very polite, courteous and tidy - which was really greatly appreciated. They left the house clean and tidy after both days work. The windows look fabulous and the quality is excellent. We are delighted we chose KJM and would to thank Mark and the team for taking care of us so well. We are more than happy to recommend the KJM window fitting service.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Excellent products & customer service
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
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Professional and helpful
Shae and Jordan installed a new lounge window in my house and were very professional and friendly. They competed the installation quickly and left no clear up at all! Happy to recommend KJM as a window fitting service
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Fantastic Double Glazing Service
Just had KJM fit 8 double glazing units, including a large bay/box window, and am very happy indeed with the both the workmanship and the quality. A top job done by a very friendly and professional team. Wholeheartedly recommended!
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Front door and 10 windows replaced
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Great product and service
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Extension
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Wiltshire
Customer recommends this business
Changing misted double glazed units
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
4 / 5
Value
4 / 5
Customer in Hampshire
Customer recommends this business
Brilliant!
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!
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Wiltshire
Customer recommends this business
Great aftercare
Kerry arrived on time, was friendly and efficient and did a great job. I would definitely recommend
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Window replacement and conservatory new fixed roof and windows plus external doors. Great service and workmanship.
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
KJM Andover window installation
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Wiltshire
Customer recommends this business
New doors, new windows and a new solid conservatory roof
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hampshire
Customer recommends this business
Installation of new front door
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Local context
Rated 5.0, in line with the local average for window / door fitters in Andover
Across 6 window / door fitters in Andover, the typical rating is 4.9 out of 5. We compare against the same businesses a homeowner would find searching for this trade locally.
03
From customer reviews
What customers consistently say
Recurring themes from 33 customer reviews on Which? Trusted Traders.
Respectful and tidy in your home: “vacuumed at the end of each day, leaving everything clean and tidy” · Which? Trusted Traders, 12 Apr 2024
Clear communicationQuoted from 3 reviews
“Delays with suppliers was dealt with professionally with great communication” · Which? Trusted Traders, 30 Jan 2025
“communication and service was exemplary” · Which? Trusted Traders, 23 Jan 2025
“Communication was brilliant” · Which? Trusted Traders, 21 Jan 2025
Credentials and associations
Credentials and memberships
4
These credentials and memberships are attributed to named public sources. Check the source before relying on them.
These sources do not label every image as completed work. The gallery may include projects, people, logos or certificates, so it does not count as completed-work evidence.
Composite door
Showroom
Warm roof glazed extension
Aluminium door
Timber bay window
Flush Casement
Through the round window
From Which? Trusted Traders
Opening hours
The hours this business publishes online, handy for knowing when to call. Confirm before you set off.
Monday–Friday
9am–5pm
Saturday
9am–2pm
04
Sources
Where this information comes from
4 named public sources
Everything on this page is drawn from named public sources. Where a source provides a public link, you can open the original and dig deeper.
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.
These are statements the business makes on its own website, worth confirming in writing (and on the official registers) before you hire, not independently verified by us.
Always confirm credentials and quotes with the business directly before hiring.
✓
Be wary of high-pressure 'today-only' discounts and a salesperson who won't leave. A reputable window or door firm gives you a written, itemised quote you can take away and compare against others.
✓
Never pay the full price up front; a modest deposit with the balance on completion is normal. Ask what deposit protection or insurance-backed guarantee you get if the firm stops trading before fitting.
✓
Get the specification in writing (frame material, the glazing units and their energy rating, and any trickle vents) so you can check you got what you paid for.
Want an extra legitimacy check? Run the Cowboy Checker on KJM Windows and Conservatories before you contact them.
Common questions about KJM Windows and Conservatories
Is KJM Windows and Conservatories a legitimate business?
KJM Windows and Conservatories has 96 independent public reviews, rated 5 out of 5. This is independent public evidence gathered from named public sources (no ads, no paid placement), not a guarantee of workmanship. If anything here is out of date, the business can request a correction.
What do customers say about KJM Windows and Conservatories?
KJM Windows and Conservatories has 96 public reviews, averaging 5 out of 5. You can read the individual reviews and where each came from in the reviews section above.
How do I know KJM Windows and Conservatories' reviews are genuine?
KJM Windows and Conservatories' 96 public reviews come from a named public review source, and MyTrustedTraders links every one back to where it was published, so you can open the source and read them yourself rather than trusting a single curated page. MyTrustedTraders brings this public evidence together with no ads and no paid placement: we show where every review came from rather than selling rankings, so you can weigh the evidence for yourself.
Has KJM Windows and Conservatories had recent public reviews?
KJM Windows and Conservatories has 5 public reviews dated within the last 12 months. That shows their review history includes recent feedback; it does not prove current availability, so confirm capacity before hiring.
Is KJM Windows and Conservatories qualified and accredited?
We hold 4 independently sourced credentials for KJM Windows and Conservatories, including FENSA, Trading Standards Approved (Buy With Confidence), TrustMark, Which? Trusted Trader. Each is attributed to the body that issued it in the credentials section. For example, FENSA is the competent-person scheme for replacement windows and doors, self-certifying they meet building regulations.
Does KJM Windows and Conservatories guarantee their work?
They state on their own website that 10-Year Warranty. This is the business's own statement on their website, not something we have independently checked. Get the terms in writing before you agree to the job.
What does KJM Windows and Conservatories specialise in?
KJM Windows and Conservatories lists specialist services including Double glazing installation, Timber windows, Sash windows, Window consultants, Aluminium Windows, Double glazed units. If your job is one of these, look for it in their listed services or ask them to confirm for your project.
What areas does KJM Windows and Conservatories cover?
They state on their own website that they cover Andover, Winchester, Hampshire, Berkshire, Wiltshire, Surrey. This is the business's own statement on their website, not something we have independently checked. Confirm they cover your postcode before booking.
How long has KJM Windows and Conservatories been trading?
They state on their own website that the business was established in 1983 (43 years in business). This is the business's own statement on their website, not something we have independently checked.
These describe public evidence MyTrustedTraders held at the stated dates. They are not independent awards, they cannot be bought, and they do not change this business's Trust Score or search position. How milestones are measured
