Georgian Bar Windows in London
The single detail that turns a modern window into a period one. Georgian and astragal bars in 18mm or 25mm profile, jointed with authentic duplex-butt at every intersection, in through-frame, internal or external configurations — across all three of our window ranges.
Georgian Bar 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 georgian bar 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.
Specification18mm or 25mm astragal bars · through-frame, internal-Grille or external configurations · duplex-butt mechanical jointing · lead-effect upgrades · matching hardware finishes
What sets our georgian bar windows apart in London.
Through-Frame Astragal Bars
The bar physically passes through the sealed glass unit — the most convincing option and the one most likely to secure planning consent in conservation areas.
18mm or 25mm Profile
Two heritage widths — 18mm for slimmer Regency and Victorian proportions, 25mm for the deeper bars typical of Georgian and Edwardian properties.
Duplex-Butt Jointing
Bar intersections are mechanically jointed rather than moulded — the joint has the same visual weight as the surrounding bar, exactly as a real timber glazing bar would.
Any Layout
6-over-6, 8-over-8, 6-over-1 (Victorian sash), 2-over-2 (Edwardian), diamond, marginal-light — matched to the age and style of the property.
Lead-Effect Upgrade
Lead-effect and stained-glass upgrades for Arts & Crafts, Victorian villa and cottage-style properties. Coloured, textured and etched glass available.
Across All Three Ranges
Available on uPVC, aluminium and flush-casement — the bar profile and jointing are consistent regardless of which material you specify.
Georgian Bar Windows installed across London.
We regularly install georgian bar windows across London. Explore your town for local detail on planning, postcodes and recent work.
Common questions from London homeowners.
- Which bar option is most authentic?
- Through-frame 18mm astragal bars with duplex-butt jointing at the intersections — the bar physically passes through the sealed glass unit rather than being applied internally or externally. It is the most convincing option and the one most likely to secure planning consent in a conservation area.
- What's the difference between astragal and Georgian bars?
- Colloquially they refer to the same thing — a bar that visually divides a window into smaller panes. Strictly, an astragal is the moulded profile of the bar itself; Georgian refers to the layout (typically 6-over-6). Our bars are moulded astragal profiles in the classical Georgian, Regency and Victorian layouts.
- Do bars reduce thermal performance?
- Through-frame bars reduce whole-window U-value by roughly 0.1 W/m²K vs an equivalent bar-free unit. Internal-grille and external-applied bars have no thermal penalty because they don't cross the sealed unit.
- Can I have Georgian bars on a bay window?
- Yes — on any bay, bow or sash configuration. We match the bar profile, colour and jointing across the whole assembly.
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 georgian bar windows.