Timber Casement Windows
High-Performance Timber Casement Windows Made to Order
Our bespoke timber casement windows are designed to combine period authenticity with modern performance. Each unit is made to order, using high-quality Accoya and hardwoods, with glazing and security upgrades available to suit both heritage properties and new-build projects.
Heritage & Period Casement Window History
Casement windows have been part of British architecture since the medieval period, traditionally hinged on the side and often paired with leaded glass. Today, we continue this tradition by replicating original details for conservation areas while integrating energy-efficient glazing, discreet draught seals, and durable finishes.
Security
What are Astragal Glazing Bars on Timber Casement Windows?
Astragal bars are fixed to the surface of the glass on both sides of the sash. Internally, a duplex spacer bar is sealed inside the double-glazed unit. This gives the appearance of individual panes, while keeping the wooden casement window energy-efficient and suitable for modern building standards.
We offer several traditional astragal configurations that are frequently requested in conservation area applications, including Georgian grids and vertical or horizontal bar layouts.
Key Features of Our Timber Casement Windows
Our timber casement windows combine traditional joinery with precision engineering to meet modern performance standards. Each unit is made to order using premium engineered timbers, with a choice of frame profiles – 92mm x 60mm or 79mm x 70mm – both available with discreet hidden trickle vents for background ventilation that preserves the clean aesthetic of the frame.
- Engineered Timber Stability - Manufactured from multi-layer Accoya, Sapele, or Oak for exceptional stability, minimal movement, and long lifespan
- Energy-Efficient Glazing - Available with double or vacuum glazing achieving centre pane U-values as low as 0.4 W/m²K.
- Precision Joinery - CNC-machined frames and sashes ensure consistent fit, smooth operation, and enduring accuracy.
- Secure by Design Options - Classic Range handles available with SBD certification, paired with Winkhaus multi-point locking systems.
- Conservation & Article 4 Compliance - Authentic mouldings, slim profiles, and glazing details designed to meet conservation and planning requirements.
- Durable Factory Finish - Teknos 4-coat microporous paint system for long-term protection in any RAL or dual-colour finish.
- Discreet Ventilation - Optional hidden trickle vents integrated within the frame head to meet Building Regulations without affecting appearance.
- Heritage Detailing - Multiple mould profiles, glazing bar layout designs to replicate original joinery across Georgian, Victorian, and Edwardian styles.
- Custom Hardware Choices - Select from Classic, Classic Plus (Coastal), or Deluxe (From the Anvil) ranges to match your specification.
- Advanced Glazing Beads - Internally glazed for security, with precision-cut beads and seals for a refined internal finish (externally glazed options available).
- Flexible Opening Styles - Flush, stormproof, flying mullion, or tilt & turn configurations — open-in or open-out to suit your project.
- Sustainably Sourced Timber - All timber is responsibly sourced from certified suppliers, ensuring every window meets environmental and ethical standards without compromising quality or durability.
Our Four Wooden Casement Window Options
We offer a complete range of timber casement window designs to suit different property styles and performance needs. Choose from flush casements with slim, heritage sightlines; stormproof casements for enhanced weather protection; or tilt & turn casements that provide flexible ventilation and easy cleaning. Every design can be specified with single, double, or advanced vacuum glazing, with optional traditional or contemporary glazing bars.
Quality bespoke
Flush Casement Window
Quality bespoke
Flying Mullion Casement Window
Quality bespoke
Stormproof Casement Window
Quality bespoke
Tilt & Turn Casement Window
View Our Wooden Casement Windows Up Close
PAS 24, Conservation Area & Article 4 Options
PAS 24: For new-build compliance, we supply casement windows tested to PAS 24:2022.
Conservation Areas & Article 4 Directions: Our team replicates original mouldings, slim profiles, and glazing details to meet planning requirements while achieving improved energy efficiency.
Paint Colour Options
Our Teknos four-coat microporous system provides a durable finish in any RAL colour. Dual-colour finishes are available, allowing different shades inside and out. Current trends include deep heritage greens, soft greys, and off-white shades for period properties.
Glazing Bar Options
Timber casement windows can be manufactured with:
Integral glazing bars for strength and authenticity.
Applied astragal bars to replicate historic patterns.
Options include Georgian, Edwardian, leaded, and bespoke layouts.
View Our Timber Casement Window Gallery
Explore our gallery to see how our bespoke timber casement windows complement a wide range of architectural styles — from Georgian and Edwardian homes to modern extensions and new-build developments. Each project showcases our attention to proportion, detail, and finish, with options ranging from flush and stormproof designs to tilt & turn and flying mullion casements.
Every window in our collection is individually made to order and factory-finished for lasting performance and visual harmony.
Glass Options
Double Glazing (Standard)
Our standard unit offers excellent thermal performance, with centre-pane U-values from 1.2 W/m²K. It’s suitable for most residential projects and comes with a laminated option if additional safety or security is needed. An energy test certificate is available on request.
Vacuum Glazing (Upgrade)
This ultra-slim glazing option delivers centre-pane U-values as low as 0.4 W/m²K while closely matching the appearance of single glazing. It’s ideal for Article 4 and conservation areas where visual authenticity and insulation are both priorities. Lead time for vacuum units is typically 10–12 weeks.
Single Glazing
For projects requiring a traditional appearance, we also offer 4mm single glazing. This is suitable for properties in strict conservation areas and can be supplied with a bead-glazed finish to resemble a putty imitation, depending on your specification.
Glass Types Available Across All Formats:
Where supported by the glazing type, you can choose from the following glass options:
Laminated Glass – For safety and improved security
Acoustic Glass – Helps reduce external noise, ideal for urban locations
Reeded Glass – For a decorative finish with partial obscurity
Satin Obscure Glass – Provides full privacy with a frosted appearance, often used for bathrooms
We’ll guide you through these choices during the design process, or you can contact us if you need help specifying glass for your property or planning conditions.
Hardware Choices
We offer three distinct ranges of casement window hardware, allowing you to match both style and performance requirements:
Classic Range – durable and practical fittings in polished brass, chrome, satin chrome, black, bronzes, and white finishes. A reliable choice for traditional or modern homes. This range also includes Secured by Design approved handles for clients who require enhanced security.
Classic Plus (Coastal) – premium marine-grade stainless steel ironmongery from Coastal, designed for maximum durability and resistance to coastal or high-exposure conditions.
Deluxe Range (From The Anvil) – hand-forged ironmongery with characterful detailing, perfect for clients seeking authentic period finishes with modern performance.
Our Classic Range includes handles, stays, and Secured by Design approved options for enhanced security.
Timber Casement Window Technical Details
Typical CAD drawings are provided for all casement ranges – including flush, stormproof, flying mullion, and tilt & turn – showing key frame sections, sash profiles, and weather-seal positions. These drawings help architects, contractors, and homeowners understand the technical interface between joinery and structure.
Full specification sheets, performance data, and installation guidance are available on request.
Available as open-in or open-out windows.
Threshold and cill profiles tailored for brick-to-brick, check reveal, or rendered openings.
CAD drawings and specification sheets are provided on request.
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What Our Customers Say
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FAQs
What types of timber casement windows do you offer?
We manufacture flush, stormproof, flying mullion (French), and tilt & turn timber casement windows. Each design is made to order and available with single, double, or advanced vacuum glazing.
Are your timber casement windows suitable for conservation areas?
Yes. Our windows are designed for heritage properties, including homes within conservation areas or under Article 4 restrictions. We replicate original mouldings, slim sightlines, and glazing details to satisfy planning requirements.
Do your casement windows meet PAS 24 security standards?
Yes. We offer PAS 24:2022 tested casement windows with Winkhaus multi-point locking systems and Secured by Design approved hardware available within our Classic Range.