Windows
Timber casement windows
We make bespoke timber casement windows for period and contemporary homes across London and the Home Counties. Side-hung or top-hung, with true period sightlines and flush or stormproof profiles, each window is built to order with modern glazing and draught-proofing.
Casement windows — hinged at the side or top to open outward — are found across many period properties, from cottages to Edwardian and 1930s homes, and remain a natural choice for new openings and extensions. Their character comes from slim frames, fine glazing bars and a flush fit against the façade.
We make every casement to order, with a true flush casement option where the opening sash sits flush within the frame for an authentic period appearance. Mouldings, bar widths and ironmongery are matched to your property so the windows feel right for the building.
As with our sash windows, traditional appearance meets modern performance: slim double or vacuum glazing, factory-applied microporous paint, and concealed draught-proofing.
A flush casement should sit quietly in the wall — clean lines, fine bars, no compromise on warmth.
What matters
Designed around the rules for your home
True flush casements
Our flush casement windows close so the sash sits flush within the frame, recreating the clean, slim look of traditional joinery — ideal for cottages, conservation areas and period homes.
Matched to your property
Georgian, Victorian and Edwardian casement styles each have their own proportions and glazing patterns. We match them precisely, with period-appropriate ironmongery in your choice of finish.
Modern performance
Slim double and vacuum glazing options reach whole-window U-values as low as 0.8 W/m²K, with timber-masked or true glazing bars preserving the period look.
Specification
The detail, documented
Specification options for timber casement windows. Final specification is confirmed at survey and tailored to your property and conservation requirements.
Glazing options
| Single glazed | 6mm toughened glazing with a solid through 'true bar' up to 24mm and putty-imitation external beads — for the most stringent heritage settings |
|---|---|
| Slim double glazed | 12mm unit (4–4–4, argon, low-E) giving a whole-window U-value of 1.9–2.2; or 14mm unit (4–6–4, argon, low-E) giving 1.6–1.8 |
| Vacuum glazed | 7.8mm high-spec vacuum glazing giving a whole-window U-value of 0.8–1.0 — the slimmest sightline with the highest performance |
| Timber-masked glazing bars (20mm) | Our most popular bar. Slim 20mm bars in matching timber, factory-finished with the window — ideal for Georgian, Victorian and Edwardian properties |
| True glazing bars (up to 24mm) | Solid through 'true bars' up to 24mm wide (not stick-on), with putty-line finish |
| Leaded lights | Traditional leaded-light glazing in diamond or rectangular (square) patterns — ideal for period, heritage and conservation properties |
Timber species
| Engineered redwood pine | With hardwood sill — our most popular option, chosen for stability and value |
|---|---|
| Full hardwood meranti | A durable hardwood throughout |
| Accoya® | Modified timber with exceptional stability and longevity |
| European oak | A premium, characterful hardwood |
| Certification | FSC® certified timber |
Joinery & operation
| Construction | Traditionally mortise-and-tenon jointed, manufactured to order |
|---|---|
| Flush casement | Opening sash sits flush within the frame for an authentic period appearance |
| Operation | Side-hung or top-hung, with friction stays or traditional casement stays and fasteners |
| Draught-proofing | Concealed weather-seals for comfort without altering the look |
Finish
| Paint system | Factory spray-finished before delivery; microporous system that lets the timber breathe |
|---|---|
| Colours | Single or dual colour, with a wide choice of RAL colours. We can also colour-match heritage brands such as Little Greene and Farrow & Ball |
| Coating warranty | 3 years on the factory-applied paint finish, subject to the recommended maintenance; recoating intervals depend on exposure and location |
Guarantee
| Component | Warranty |
|---|---|
| Timber frame | 8 years |
| Glass & sealed units | 3 years |
| Hardware & ironmongery | 5 years |
| Paint finish | 3 years |
| Conditions | Timber and paint guarantees are subject to the recommended maintenance schedule. Guarantees cover manufacturing defects, not damage, neglect or normal wear. |
How it works
From first survey to aftercare
- 01
Initial quotation
We provide an initial quotation within 1–3 days of your enquiry.
- 02
Site survey
Within 1–2 weeks we measure and document the openings on site, recording profiles, sightlines and any conservation status.
- 03
Drawings & approval
We produce production drawings and a specification for your approval — and to support any planning or listed building consent.
- 04
Manufacture
Once your specification is approved, each window is crafted to your approved specification. Typically 5–8 weeks; 7–12 weeks for larger or bespoke conservation work.
- 05
Installation
Our fitting teams install with minimal disruption — typically 1–5 days depending on project size.
Questions
Listed building windows: your questions answered
What is a flush casement window?
A flush casement window is one where the opening sash closes flush within the window frame, rather than sitting proud of it. This recreates the slim, clean appearance of traditional timber joinery and is well suited to cottages, period homes and conservation areas.
What is the difference between casement and sash windows?
A casement window is hinged at the side or top and opens outward like a door, while a sash window slides vertically. Casements suit many cottages, Edwardian and 1930s homes and new openings; sash windows define Georgian, Victorian and Edwardian townhouses. We make both, matched to your property.
Can casement windows be double glazed?
Yes. Slim double-glazed and vacuum-glazed units achieve whole-window U-values as low as 0.8 W/m²K while keeping slim sightlines and fine glazing bars. Single-glazed options with true bars are available for the most sensitive heritage settings.
Are timber casement windows suitable for conservation areas?
Often, yes. Our flush casements with timber-masked or true glazing bars and period-correct profiles are designed to meet conservation requirements. We advise on the most likely acceptable specification for your property and support any planning application.
Which areas do you cover?
We work across London and the Home Counties, including Surrey, Kent, Essex, Hertfordshire and Buckinghamshire.
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Discuss your project
Tell us about your property and we’ll advise on the most appropriate, consent-ready specification.
01527 590 776