Casement Windows Winchester

Q: What is the difference between 'Flush' and 'Stormproof' casements?

A 'Stormproof' casement has a lip that sits proud of the frame—ideal for modern homes. A 'Flush' casement sits flat within the frame, mimicking traditional timber joinery. Flush casements are preferred for Winchester conservation areas.

Q: Do I need planning permission to replace windows in Winchester?

If you are in a Conservation Area (like St Cross or Hyde) or a Listed Building, rules apply. KJM specialises in heritage-approved windows, like the Residence Collection, designed to satisfy local planning officers.

Q: How secure are your casement windows?

Extremely secure. Our windows are internally beaded and feature multi-point locking systems with high-security SAC bolts. They meet or exceed PAS24 security standards.

Q: Do I have to have trickle vents fitted?

To comply with Part F Building Regulations, most replacement windows now require trickle vents to prevent mould. We install discreet, colour-matched vents that provide compliance without ruining the look.

Casement windows are the most popular style of window in the UK, but in a city as diverse as Winchester, one style does not fit all. The modern family homes in Badger Farm require clean, energy-efficient lines, whereas the Victorian terraces of Fulflood often demand the traditional “flush” sightlines of 19th-century joinery.

At KJM Group, we offer a bespoke range of casement windows to suit every property type. From the ultra-modern slimline aluminium of Smart Systems to the heritage-approved Residence Collection (R9 & R7) that replicates timber perfection, we have the solution. All our windows are A-rated for energy efficiency and come with our strict No Pressure Promise.

View our full range of Winchester Home Improvements here.

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.

Fixed glass panes

Hinged openings

Multi-Point Locking Systems

Colour Customisations

Thermally Efficient

Available in double glazing and triple glazing

Black casement windows for a Winchester home.

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 TOUCH

A white casement window for a Winchester home.

A-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.

Colour Options

Glass Options

an example of a window in pre-selected colour

Glass Options

clear

arctic

autumn

chantilly

charcoal-sticks

contora

cotswold

digital

everglade

flemish

florielle

mayflower

minister

oak

pelerine

stippolyte

sycamore

taffeta

warwick

white

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cream

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cream claystone

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pebble grey

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windsor

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sage smooth

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silver d smooth

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agate grey

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kensington grey

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basalt grey mooth

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anthracite grey

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hazy grey finesse

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casment slate grey

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buckingham grey

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slate grey finesse

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chartwell green

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Steel Blue

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dark green

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flernish gold smooth

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dark red

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pyrite

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casement Irish oak

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casement Light Oak

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casement Rosewood

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black brown

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black ulti matt

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Anteak

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Honey Oak

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Swamp Oak

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Casement Window Handles Andover, Hampshire

Casement Windows Locks Andover, Hampshire

Casement Windows Hinges Andover, Hampshire

Casement Windows Shootbolt Locks, Andover, Hampshire

Casement Window Prices Winchester

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.