Flush Casement Windows in London
The window that finally lets period homes have both the warmth of modern glazing and the elegance of true timber. Our flush casements sit perfectly level with the outer frame — with mechanical corner joints, monkey-tail handles, pencil-round edges and dummy sashes that would fool a joiner at three paces.
Flush Casement Windows designed around sash-heavy period stock, communal-window agreements and RBKC / Camden conservation planning.
From Chelsea townhouses to Hampstead villas and Ruislip family homes, we install across every London borough — inside the M25 and out. Our surveyors know the quirks of Victorian sashes, Edwardian bays and post-war casements.
Working across London means understanding period detail, party-wall etiquette and permit parking as well as we understand glass. We schedule dust sheets, protection and clean-down like a good building firm should.
Energy-efficient flush casement windows installed across London achieve whole-window U-values of 0.9–1.4 W/m²K, with the exact frame and glazing specification confirmed after survey.
SpecificationMechanically-jointed 70mm flush uPVC profile · Heritage foil finishes · Argon-filled A+ rated glazing · Solid brass monkey-tail furniture · Q-Lon compression seals
What sets our flush casement windows apart in London.
Mechanically-Jointed Corners
True 45° mechanical joints (not welded seams) at every corner — the single detail that separates a heritage flush casement from a standard uPVC window at a glance.
Timber-Look, Zero Maintenance
Deep-grain foil finishes in Painswick, Chartwell Green, Anthracite, Cream, Rosewood and Irish Oak — colour-fast for 25+ years, no sanding, no repainting, no rot.
Conservation & Listed Building Ready
Accepted in the majority of conservation areas across London and the Home Counties. We prepare planning drawings and finish samples for your officer at no charge.
Monkey-Tail & Peardrop Hardware
Solid brass monkey-tail handles, peardrop stays and traditional casement fasteners in polished chrome, antique brass, pewter or black — chosen to match the era of the house.
Heritage Style, 0.9–1.4 W/m²K
A six-chamber profile, warm-edge spacer and argon-filled glazing provide energy-efficient whole-window performance behind traditional Georgian proportions.
Georgian Bars & Astragal Options
Internal, external and through-frame Georgian bars in 18mm or 25mm, with authentic astragal profiles and duplex-butt jointing. Lead-effect and stained glass upgrades available.
Flush Casement Windows installed across London.
We regularly install flush casement windows across London. Explore your town for local detail on planning, postcodes and recent work.
Common questions from London homeowners.
- Do these really look like real timber?
- Closer than any window we've fitted. Mechanical (not welded) corner joints, deep grain foil, pencil-round profile edges and traditional hardware — walk past one at three paces and you would not know.
- Will they be accepted in a conservation area?
- In most cases yes, particularly with timber-effect finish, Georgian bars and monkey-tail handles. We prepare planning drawings and finish samples for your officer at no charge and have secured approvals across London, Herts and Bucks conservation zones.
- Are they allowed on listed buildings?
- Sometimes — listed-building consent is at the discretion of the local authority. Where uPVC is refused, we can supply the same profile in painted aluminium or timber-composite. We advise honestly on your chances at survey.
- How do they compare on thermals to a standard uPVC casement?
- Identical — same six-chamber 70mm profile, same A+ glass, same warm-edge spacer. The mechanical joints and flush appearance are purely aesthetic; thermal and security performance is unchanged.
- What Georgian bar option looks most authentic?
- Through-frame 18mm astragal bars with duplex-butt jointing at the intersections — the bar physically passes through the glass unit rather than being applied internally or externally. It is the most convincing option and the one most likely to secure planning consent.
- What makes flush casements different from standard casements?
- The sash sits level with the outer frame, while mechanical joints and heritage hardware create a timber-like appearance. They suit period properties and conservation-sensitive elevations particularly well.
- Can I mix flush casements with standard casements?
- Yes — many clients specify flush casements to the front elevation (for kerb appeal or planning) and standard uPVC to the rear (to suit the character of each elevation). We match colour, glass and handle finishes across both.
- How long is the lead time?
- 4–6 weeks from signed order for standard heritage colours and bar arrangements. Bespoke arched heads and non-standard RAL sprays add 1–2 weeks.
Related windows services in London.
Book your London survey.
Tell us about your London project. A senior surveyor will call within one working day to arrange a free on-site visit and fixed quote for your flush casement windows.