Flush Casement Windows
Our flush casement windows are a great way to bring slim sightlines together with the look of traditional timber for homes across South London, Surrey, and Kent. Start a free online quote with Osborn's today.
What are flush casement windows?
Enhance your home with flush casement windows from Osborn’s. Designed with a sash that sits level with the frame, flush sash windows recreate the timeless appearance of traditional timber while delivering modern energy efficiency, security and low maintenance. Available in uPVC, aluminium and timber, our made-to-measure flush casement windows are ideal for period properties, conservation areas and contemporary homes across South London, Surrey and Kent.
An Authentic Design
The sash sits perfectly level with the frame, creating a traditional timber-style appearance with clean, sightlines and lasting kerb appeal.
Ideal for Every Property
Perfect for period homes, conservation areas and modern properties, with bespoke designs to work with each style and individual preference.
Outstanding Energy Efficiency
Available with high-performance double or triple glazing, helping to keep your home warmer while potentially reducing energy bills.
Plethora of Styles
Choose from uPVC, aluminium, or timber, with a full range of colours, finishes, and hardware to match your property's character.
Flush Casement Window Options
Every range comes in its own choice of colours and finishes, from smooth whites and realistic woodgrain foils to powder-coated and heritage shades. Download the brochure below to see the full palette, or ask us to bring samples to your free survey.
Our Gallery
Get inspired by our previous flush casement window installations and see how they look once fitted on real South London homes. With a clean, flat profile that suits both modern and traditional properties, our gallery shows just how versatile flush casement windows can be.
Flush Casement Features & Benefits
Every flush casement we fit has a sash that sits level with the frame, but each range has its own character. Compare the profile, detailing and finishes to find the right match for your home.
Liniar Flush Sash
Liniar’s flush sash sits level with the outer frame, with no tell-tale uPVC overlap outside. Choose welded joints for a crisp, modern finish or mechanical joints for an authentic timber look. The system is PAS 24 and Secured by Design accredited, with a patented bubble gasket to help seal out draughts.
Halo Rustique & System 10
Supplied through John Fredericks’ Ultimate Collection, Halo flush casements are built on a 70mm multi-chambered profile in two looks: Rustique, with a sculpted ovolo finish, or System 10, with a crisp bevelled edge. Timberweld or mechanical joints, Monkey Tail or Tear Drop handles and PAS 24 security options let you tailor the detail.
Residence 7
R7 is flush inside and out, so the window looks as neat from your living room as it does from the street. Its 75mm, seven-chamber frame suits both modern and traditional homes, takes double or triple glazing and comes in matt Chalk White, Vintage Cream and No.38 Grey as well as woodgrain foils.
Residence 9
Residence 9 is designed to replicate the 19th-century flush sash timber window. A deep 100mm, nine-chamber frame, hand-finished mechanical joints, traditional butt hinges and working peg stays give genuine period detail, while 28mm double or 44mm triple glazing keeps rooms warm. Its authentic look means it can be considered for conservation areas.
VEKA OMNIA
OMNIA from VEKA pairs a flush sash option with an ultra-slim profile that maximises the glass, letting more natural light into your rooms. It offers excellent thermal performance, is made in the UK from recyclable uPVC and comes in white, anthracite grey and a choice of woodgrain effects.
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Areas We Cover
Based in South Norwood, we cover South London, Surrey, Kent, and Sussex. We also take on larger projects nationwide. Get in touch to confirm that we cover your area.