French Casement Windows in Hertfordshire
The widest unobstructed opening we can fit into a fixed aperture. Twin sashes swing fully outward from a central meeting stile — no mullion, no visual break, and a compliant fire escape on a single window.
French Casement Windows designed around Edwardian and Victorian bays along the A1(M) corridor — acoustic packages included.
St Albans, Harpenden, Watford, Hemel Hempstead and Berkhamsted — we cover Hertfordshire's full palette of Georgian, Edwardian and modern homes with a senior surveyor on the ground every week.
The A1(M) and A41 corridor means Hertfordshire homeowners consistently benefit from acoustic-rated glazing. We spec triple-glazed and laminated options that transform a home's soundscape.
Energy-efficient french casement windows installed across Hertfordshire achieve whole-window U-values of 0.9–1.4 W/m²K, with the exact frame and glazing specification confirmed after survey.
SpecificationSix-chamber uPVC or thermally-broken aluminium profile · shoot-bolted centre meeting stile · argon-filled A+ glazing · Yale multi-point locking
What sets our french casement windows apart in Hertfordshire.
No Central Mullion
Both sashes meet on a shoot-bolted centre stile that opens with them — the aperture is completely clear when both are open, unlike a standard 2-light casement.
Widest Clear Opening
Up to 1.6m of clear width on a standard aperture — the widest opening on any hinged window we supply, and a compliant Doc B fire escape on habitable first-floor rooms.
Kitchen & Dining Room Favourite
The natural choice above a sink or over a garden view — throw both sides open and the view is uninterrupted.
Available in All Three Ranges
In uPVC, thermally-broken aluminium or heritage flush-casement — same principle, three material finishes to suit the property.
PAS 24 Secured Locking
Multi-point espagnolette locking on both sashes with shoot-bolts top and bottom — as secure as any single-sash casement, tested to PAS 24:2016.
Astragal & Georgian Bar Options
Full bar and glazing options — a French casement can carry the same period detailing as a fixed light of the same size.
French Casement Windows installed across Hertfordshire.
We regularly install french casement windows across Hertfordshire. Explore your town for local detail on planning, postcodes and recent work.
Common questions from Hertfordshire homeowners.
- How is a French casement different from a normal 2-light casement?
- A normal 2-light casement has a fixed mullion between the two sashes — you always see the vertical bar. A French casement has no mullion; the two sashes meet on a movable centre stile that opens with them, so when both are open the aperture is completely clear.
- Are they secure without a central mullion?
- Yes — the meeting stile has shoot-bolts at the top and bottom that engage into the outer frame, and the active sash has multi-point espag locking. The whole assembly is tested to PAS 24 and provides the same security as a standard casement.
- Can I have Georgian bars on a French casement?
- Yes — astragal and Georgian bars in 18mm or 25mm, applied or through-frame, are available on both sashes and any fixed lights above. Popular on flush-casement French windows in period properties.
- Do they open inward or outward?
- Outward by default in the UK — matching the direction of standard casements and Building Regs conventions. Inward-opening French casements are available on request but rarely specified.
Related windows services in Hertfordshire.
Book your Hertfordshire survey.
Tell us about your Hertfordshire project. A senior surveyor will call within one working day to arrange a free on-site visit and fixed quote for your french casement windows.