KJM has always strived to provide the very best after-sales service.
Customer Care
Our commitment to you extends long after your installation is complete. At KJM Group, we believe that reliable aftercare is just as important as the initial fitting. As a Which? Trusted Trader, FENSA, and TrustMark registered company, we uphold strict standards of consumer protection and ethical trading across all our services.
While our modern uPVC, aluminium, and composite products are designed to be low maintenance, they still require occasional care to ensure optimal performance over the years. This page provides you with straightforward maintenance guides, warranty details, and direct contact information so you can easily reach our team whenever you need support or hardware adjustments.
Customer Care & Aftersales
Our commitment to you extends long after your installation is complete.
At KJM Group, we believe that reliable aftercare is just as important as the initial fitting. To ensure your enquiry is resolved efficiently, please reach out to the relevant team member below. We prioritise excellent aftercare and aim to respond to all service requests promptly.
Service & Repairs
If you require warranty support, hardware adjustments, or general repairs, Kerry is on hand to coordinate a prompt resolution.
Email Service TeamInstallation Scheduling
For updates regarding your fitting dates, delivery schedules, or access requirements, Emma will keep you fully informed.
Email InstallationsTechnical Enquiries
If you have technical questions about your products or need advice on operating your new windows and doors, Paul is available to assist.
Email Technical TeamMaintenance Guides & Downloads
General Care Routine
While modern uPVC, aluminium, and composite products are designed to be low maintenance, regular care is essential to keep them looking their best and operating smoothly. As a general rule, we recommend:
- Routine Cleaning: Wash frames and glass regularly with warm, soapy water and a soft cloth. Please avoid abrasive cleaners, scouring pads, or harsh chemicals.
- Hardware Lubrication: To maintain smooth operation, apply a light silicone spray or lubricating oil to hinges, locks, and moving parts every six months.
- Drainage & Tracks: Ensure that concealed drainage channels and sliding tracks are kept free of dirt, leaves, and debris.
For detailed, product-specific instructions, please download the relevant maintenance handbooks below:
Accreditations & Consumer Protection
As a long-standing member of the industry's leading regulatory bodies, we adhere to rigorous codes of practice. These memberships ensure that your installation is fully compliant, financially protected, and provides access to free, independent dispute resolution procedures.
Which? Trusted Traders
FENSA Registered
TrustMark
GGF Member
Frequently Asked Maintenance Questions
Quick answers on how to care for your new windows, doors, and conservatories.
Wash glass and frames every 3 to 4 months using warm soapy water and a soft cloth. Clean interior glass monthly if needed.
Never use abrasive cleaners, steel wool, razor blades, bleach, or solvent-based cleaners (such as WD-40, acetone, or heavy spirits), as they can scratch frames, strip protective coatings, and dry out rubber seals.
Clear away dirt and debris from multi-point locks and hinges, then lubricate moving parts twice a year using a light machine oil or silicone spray (avoid heavy greases that trap dirt).
Vacuum loose dust and grit using a brush attachment, scrub stubborn residue with a soft brush, and wipe down with a mild general cleaner or warm soapy water to ensure smooth operation.
Misting or fogging between double or triple-glazed panes means the perimeter seal has failed. If this occurs, please contact our service team to arrange for a replacement sealed glass unit.
uPVC and Aluminium: Wash with mild soapy water; do not paint uPVC.
Timber: Inspect annually for peeling paint, cracks, or rot, and recoat with a micro-porous stain or paint every 4 to 6 years, depending on weather exposure.
Flush out the outer frame sill drainage slots or clear weep holes with water twice a year. This prevents dirt build-up, ensuring water drains freely to the outside and doesn't back up into the frame.
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.
We have also become Which?, Checkatrade and FENSA approved for our services as we continue to provide our customers with high quality home improvement services and products.
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.