Flush Casement Windows

With a clean, flush-fitting design, these windows offer a refined, heritage look. Ideal for traditional homes and conservation areas, they deliver understated elegance with modern performance.

Description

Flush casement windows are characterised by their sleek profile, where the opening sash sits level with the frame for a smooth, seamless appearance. A staple of traditional British joinery, they bring timeless appeal to cottages, period homes, and properties within conservation areas, while blending effortlessly with contemporary architecture when finished in modern colours or minimalist ironmongery.

This window style offers clean sight-lines and balanced proportions, often chosen for its ability to enhance character without overpowering it. With optional glazing bars and flexible configurations, flush casements provide a refined aesthetic that doesn’t compromise on performance.

At Migom Design, our flush casement windows are engineered from high-quality, knot-free timber using advanced joinery techniques. Each unit is fitted with energy-efficient glazing and durable hardware, ensuring smooth operation, thermal efficiency, and long-term durability. Whether restoring a character property or specifying for a new build, our flush casement windows combine heritage proportions with modern expectations.

Portfolio

Check our realisations and real-life photos of this product.

Mechanism


Butt hinges

A traditional hinge style commonly used in period or conservation windows. They offer a classic, unobtrusive look and are often chosen for their historical authenticity. A separate stay arm is required to hold the sash open and control ventilation.


Friction hinges

A modern solution with built-in resistance that holds the sash open without the need for additional hardware. Available in several variants, including easy-clean, egress (escape), and restricted hinges for added functionality and safety.

Timber

Redwood
Meranti
Sapele
Accoya
Other on request

All flush casement windows are supplied with a sapele cill as standard.

Glazing bar

Structural glazing bar with putty
Structural glazing bar with glazing bead
Applied glazing bar with infill
Applied glazing bar

Cill extension & window board

Our flush casement windows can be customised with an external cill extension and a window board, both tailored to your project’s specific dimensions and requirements.

Trickle vent

Our windows can be fitted with trickle vents, not only meeting today’s building standards but also allowing for continuous air circulation to prevent condensation – all while maintaining the window’s timeless charm with a concealed design.

Options

Single colour

Both sides of the window painted to one choosen colour.

Dual colour

Internal & external sides of the window painted to different colours, including colours from different palettes.

Non-transparent

RAL

RAL9003 Signal White
RAL9010 Pure White
RAL9016 Traffic White
RAL9001 Cream
RAL6005 Moss Green
RAL6007 Bottle Green
RAL6013 Reed Green
RAL7035 Light Grey
RAL7004 Signal Grey
RAL7030 Stone Grey
RAL7003 Moss Grey
RAL7016 Anthracite Grey
RAL9005 Jet Black
Any RAL colour

NCS

NCS S 0300-N
NCS S 0502-Y50R
NCS S 2005-Y50R
NCS S 2502-Y
NCS S 7502-B
NCS S 9000-N
Any NCS colour

Farrow & Ball

No. 3 Off-white
No. 2 Hound Lemon
No. 284 Worsted
No. 198 Broccoli Brown
No. 85 Oval Room Blue
No. 57 Off-Black
Any Farrow & Ball colour

Transparent

Lazure

Redwood

Pine
Cherry
Light Oak
Afrormosia
Walnut
Any Lazure colour

Meranti

Afzelia
Teak
Light Oak
Afrormosia
Walnut
Any Lazure colour

Handles

Contemporary

Polished Gold
Polished Chrome
Satin Chrome
Smokey Chrome
Black
White

Heritage

Polished Gold
Polished Chrome
Satin Chrome
Pewter Patina
Black
White
Antique Bronze

Stays

Heritage

Polished Gold
Polished Chrome
Satin Chrome
Pewter Patina
Black
White
Antique Bronze

Glazing style

Clear
Frosted
Master - Point
Kralika
Martele
Waterfal
Other on request

Glass structure

Annealed (Float)

A basic type of glass with a smooth, clear finish and excellent light transmission. It is commonly used for internal applications or secondary glazing where safety is not a primary concern, as it breaks into large, sharp shards when shattered.

Toughened (Tempered/ESG)

A safety glass that is heat-treated to be up to five times stronger than standard glass. It shatters into small, blunt fragments to reduce injury risk. Toughened glass is our standard option for windows and doors, offering excellent durability and impact resistance.

Laminated (VSG)

Formed by bonding two or more panes with a PVB interlayer, laminated glass holds together when broken, preventing shattering. It provides added security, noise reduction, and is ideal for entrance doors or areas requiring enhanced protection.

Gas

Double & triple glazed units

ArgonArgon

The most popular insulating gas for double glazing, ideal for cavities over 8mm. It improves thermal performance by reducing heat transfer compared to air-filled units.

KryptonKrypton

Perfect for narrower cavities under 8mm, krypton gas offers better insulation than argon in compact units. Commonly used in slim double glazing or heritage-style windows.

VacuumVacuum

Using a vacuum between glass panes eliminates gas conduction entirely, providing exceptional insulation. Ideal for ultra-slim units where thermal performance is critical.

Special glass units


Fire Rated Glazing (Critical)

Also known as fire-resistant or safety glass, it’s designed to withstand high temperatures and slow the spread of flames and smoke. Commonly used in escape routes, it’s vital for meeting safety regulations in critical areas.


Acoustic Isolation Glazing

Often called soundproof or acoustic control glass, this glazing reduces noise transmission – ideal for homes near traffic or noisy environments. It improves indoor comfort without sacrificing light or thermal efficiency.


Thermal Isolation Glazing

Also referred to as energy-efficient or insulating glass, it reduces heat transfer using advanced coatings, multi-pane setups, and gas fills like argon or krypton – helping lower energy costs and maintain stable indoor temperatures.


Stained Glass

Also known as decorative or coloured glazing, it features textured or tinted panes joined by lead strips to create distinctive designs. Traditionally used in period properties, modern stained glass can be double-glazed offering both visual charm and practical performance.

Interested in Flush Casement Windows?

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