Security & Peace of Mind
Security is not an optional extra; it is our top priority. Unlike older windows that rely on a single latch, KJM casement windows feature a robust multi-point locking system. This secures the sash to the frame at several points, making it virtually impossible to force open.
For added peace of mind, our windows are internally beaded. This means the glass is fitted from the inside, so the glazing beads cannot be removed from the exterior by an intruder to gain access. Whether you live in a town centre townhouse or a secluded village property, our windows meet strict PAS24 security standards.
Slim Sightlines, Zero Maintenance
Low Maintenance & Aesthetics
Winchester is known for its beautiful views, from the rolling Hampshire downs to the historic cathedral. Our modern casement windows feature ultra-slim sightlines to maximise the glass area, allowing natural light to flood your interior and framing the view perfectly.
Crucially, they require none of the upkeep associated with traditional timber. You will never need to sand, varnish, or repaint these frames. They are resistant to warping and discolouration, requiring only a simple wipe-down with warm soapy water to keep them looking pristine—perfect for busy homeowners.
GET IN TOUCHA-Rated Efficiency & Acoustic Control
Insulation & Weatherproofing
Hampshire weather can be unpredictable. Some of our casement windows are engineered with high-performance Q-Lon weather seals. These “memory foam” gaskets have a 99% recovery rate, meaning they bounce back to shape every time you open and close the window, creating a hermetic seal against driving rain and draughts.
This tight seal also offers exceptional acoustic performance. If you live near the M3, the railway line, or the busy city centre, our double (or optional triple) glazing significantly reduces noise pollution. Combined with A-rated thermal glass, this keeps your warm air inside and the cold air out, helping to lower your energy bills throughout the winter.
Casement Windows Customisations
At KJM, we offer our Winchester customers an incredible selection of finishes, colours, and woodgrain effects so you can find the casement window you are looking for. Whether you want classic white casement windows or sleek black casement windows, we have you covered. Click below to browse through our range and change to your preferred colour.
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If you are interested in casement windows for your Winchester home, then we are your team at KJM Group. Since 1983, we have been supplying and installing windows, doors and conservatories across the south of England. We are proud to be a Which? Trusted Trader and have attained CheckATrade membership, so you can be confident we are the right window installer for you.
Speak to our team today for more information on our casement windows by using our contact form or by giving us a call at 01264 359355. If you need an instant casement window price, we also have a bespoke quoting engine so that you can have a quote in minutes.
If you are unsure of what windows you would like for your Winchester home, you can visit our showroom in Andover. One of our expert team members can show you our window options and help you make the right choice so you can have the windows you are looking for.
Frequently Asked Questions
What is the difference between 'Flush' and 'Stormproof' casements?
A ‘Stormproof’ casement has a lip that sits proud of the frame—this is the standard look for most modern homes in areas like Badger Farm or Weeke. A ‘Flush’ casement sits flat within the frame, mimicking traditional pre-1932 timber joinery. Flush casements are the preferred choice for character properties in Winchester’s conservation areas.
Do I need planning permission to replace windows in Winchester?
If you live in a standard property, usually no. However, if your home is in a Conservation Area (like St Cross, Hyde, or the City Centre) or is Listed, strict rules apply. We specialise in heritage-approved windows—like the Residence Collection—that are designed to satisfy local planning officers by replicating original sightlines.
How secure are your casement windows?
Security is our priority. All KJM casement windows are internally beaded (meaning the glass cannot be removed from the outside) and feature multi-point locking systems with high-security SAC bolts. They meet or exceed PAS24 standards, keeping your home secure against intruders.
Do I have to have trickle vents fitted?
Under the latest Building Regulations (Part F), most replacement windows now require trickle vents to ensure adequate background ventilation and prevent mould. We understand many homeowners dislike them, so we install discreet, colour-matched vents that provide the necessary airflow without ruining the aesthetic of your new windows.