Casement windows
The most adaptable window we fit, and the right answer for the majority of Aylesbury's interwar and post-war housing.
Recent work
Casement windows we have fitted
Every photograph in this section is a Radley installation in Aylesbury or the surrounding areas. Tap any image to see it full size.
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Expert casement installation across Buckinghamshire
Casement windows suit virtually every Aylesbury property style, pairing traditional side and top opening with modern thermal performance and security. They give you fine control over ventilation, easy cleaning access from inside, and proportions that look right on a period cottage and a new-build alike.
With over 25 years fitting windows in Aylesbury, we know how casements sit against the local building stock, from Chilterns flint and brick to interwar semis and the villages north of the town. Every job is surveyed by our own experienced measurer, so the fit and the opening arrangement are worked out on your wall rather than guessed from a price list.
Why it still dominates
A casement opens on a side or top hinge and seals against a compression gasket, which makes it the most weathertight configuration in common use and the easiest to make airtight over a long life. It also takes the widest range of hardware, so egress hinges, restrictors and child-safe locks can all be specified without leaving the range.
On Bedgrove, Southcourt, Quarrendon and most of the villages north of the town, the original windows were proud casements. Replacing like for like keeps the shadow line the elevation was designed around.
Why choose casement windows for your Aylesbury property
Classic looks, modern engineering. The benefits customers tell us matter most:
- Traditional side-hung and top-hung opening functionality
- Excellent ventilation control and air circulation in every room
- Easy cleaning access from inside the property
- Authentic aesthetics that suit period and contemporary homes
- Superior security from modern multi-point locking systems
- Strong thermal efficiency, reducing heat loss and draughts
- Maintenance-free construction that lasts decades
- Extensive design options to complement any property style
- Enhanced kerb appeal and added value to the house
Configuration options
- Side-hung, top-hung and fixed lights in any combination
- Fire-egress hinges on first-floor bedrooms as standard where required
- Astragal or Georgian bars, internal or bonded
- Obscure glazing for bathrooms in six patterns
- Trickle vents fitted discreetly into the head, not the sash face
- Bay, bow and corner posts with structural reinforcement
Advanced casement window technology
Two things separate a good casement from an average one: how it opens and how it locks.
Versatile opening options
Side-hung for maximum access, top-hung for secure ventilation above sinks and radiators, and any mix of the two across a single frame. Child-safety restrictors, egress hinges and easy-action mechanisms are all specified at survey rather than added later.
Security excellence
Multi-point locking as standard, shootbolt mechanisms into steel keeps, anti-snap cylinder technology where a keyed handle is used, reinforced frame construction and laminated or toughened security glazing on vulnerable elevations.
Casement window systems
Heritage casements
Authentic proportions and traditional hardware for period homes and conservation areas across Aylesbury and the Chilterns, with modern thermal performance behind a heritage face.
Contemporary casements
Clean geometric lines, slim sightlines and large glazed areas for newer properties and extensions that want traditional functionality with a modern look.
Evolution handcrafted uPVC
Premium windows that combine timber detailing with cutting-edge uPVC technology, hand-finished by skilled craftsmen and individually made for the opening.
Specification
- Frame
- 70mm uPVC or 55mm thermally broken aluminium
- Chambers
- Six-chamber profile
- Glass
- 4-20-4 argon filled, Planitherm low-e
- Colours
- 26 finishes, dual colour available
- Locking
- Yale multi-point shootbolt
Inside the frame
A cutaway through one of our casement windows, showing how the sealed unit, gaskets and multi-chamber profile work together.
Sectional view, standard 70mm casement
- Multi-chamber profile
- Six sealed air chambers in the frame and sash slow heat loss and stiffen the section, so wide openings stay true without extra reinforcement showing.
- Sealed glass unit
- 4-20-4 argon filled double glazing with a warm-edge spacer bar and a low-e coating on the inner pane, bedded on tape rather than wet silicone.
- Twin weather seals
- Two compression gaskets, one on the sash and one on the frame, give a double line of defence against wind-driven rain and draughts.
- Drainage and glazing beads
- Internal beading holds the glass from the inside for security, and angled drainage routes any water in the rebate back out through the sill.
- Hardware and hinges
- Yale multi-point shootbolt locking into steel keeps, on stainless friction hinges with the handle sized to suit the opening.
- Sill and sub-frame
- A chambered sill throws water clear of the wall below and packs out the opening so the frame sits square in the reveal.
Materials, construction and glazing
Evolution uPVC systems, contemporary profiles and the glass that goes in them.
- Classic 2, 4 and 6 panel casement designs in period-appropriate proportions
- Traditional colour schemes and authentic hardware suitable for conservation areas
- Contemporary options with clean geometric lines and modern colour schemes
- Mechanically jointed frames for a timber-like sightline
- Decorative glass patterns and traditional leaded designs
- Contemporary geometric patterns and privacy glass for bathrooms
- Laminated and toughened security glazing available throughout
Planning permission for casement windows in Aylesbury
Most casement replacements fall under Permitted Development Rights, but conservation areas and listed buildings need specific care. We handle the checks before anything is ordered.
- Conservation areas
- Compliance with local guidance on proportions, sightlines and finishes, with heritage impact considered on every elevation.
- Listed buildings
- Listed building consent guidance and support with the application where consent is required.
- Building Regulations
- Thermal efficiency standards, safety glazing to critical locations, background ventilation and any structural considerations over wide openings.
- Certification
- FENSA registered, so the completed work is self-certified and your certificate follows the installation.
The Radley casement installation process
01
Property assessment
A full consultation on your casement requirements, looking at architectural style, opening preferences and how the windows sit with the character of the property.
02
Style selection
Working through opening configurations, glazing options, hardware and finishes to settle the exact specification for each opening.
03
Heritage consultation
For period homes, specialist advice on conservation requirements and planning so the design is right before manufacture starts.
04
Manufacturing
Individually made windows, handcrafted to the surveyed sizes with the finishes and bespoke details agreed at selection.
05
Expert installation
Fitted by our own experienced teams for a square, weathertight fit, smooth operation and clean integration with the reveal and sill.
06
Handover and operation training
A walk round every window covering operation, locking, cleaning and maintenance, with warranty paperwork and ongoing support from the team.
Visit the showroom
Visit our Rabans Lane showroom
Full-size casement windows are on display so you can compare flush and standard sightlines, feel the hardware and try the opening actions before you decide. No appointment needed.
Rabans Lane, Aylesbury · Open Mon – Fri 09:00 – 17:00 and Saturday 10:00 – 16:00
Casement benefits for Aylesbury properties
Ventilation excellence
Casements give better control of airflow than any other common window type, with opening configurations that maximise circulation and natural cooling in summer.
Maintenance accessibility
Side and top opening gives easy access for cleaning from inside, which makes casements practical at first floor and above as well as at ground level.
Authentic property integration
Traditional proportions and operation preserve the character of the elevation, so the house still reads as itself after the windows are replaced.
Why choose Radley for casement windows in Aylesbury
Traditional expertise
Specialist knowledge of traditional casement design and installation, so the result enhances the property rather than flattening its character.
Brand partnerships
We work with the best casement manufacturers, including individually designed Evolution windows handcrafted by skilled makers.
Heritage experience
Extensive work in conservation areas and on listed buildings around Aylesbury, delivering compliant installations that preserve historic character.
Comprehensive service
Heritage consultation, planning support, bespoke design, installation and ongoing maintenance through the warranty period, all from one team.
Local reputation
Over 25 years serving Aylesbury, with around 70 per cent of our work coming from customer recommendations.
Radley compared with a typical window company
- Heritage expertise
- 25+ years of conservation area work, against limited period property knowledge elsewhere.
- Installation quality
- Experienced in-house installation teams, not basic measure-and-fit.
- Opening options
- Multiple side-hung and top-hung configurations per frame rather than a short standard list.
- Local experience
- Aylesbury casement specialists rather than a general national window supplier.
- Warranty
- Ten-year guarantee, not just a basic manufacturer warranty.
- Planning support
- Full heritage and conservation guidance included.
- Materials
- Premium Evolution handcrafted systems rather than standard stock profiles.
Questions
