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Part L compliant — even on listed and conservation projects
Most period windows are single-glazed and hopelessly inefficient. Part L now requires 1.4 W/m²K on replacements — even on character homes where planners insist the window looks authentic. Our heritage aluminium gives you both: authentic astragal bars on the outside face of the glass, with 1.2 W/m²K double glazing behind it.
Conservation officers approve the look; building control approve the numbers. Heritage aluminium will not rot, will not need repainting every 3 years, and lasts 25+ years with zero maintenance. And because the frame is so slim, you get more glass than a timber heritage window — more light into the room.
Astragal vs Georgian bar: Georgian bars are clipped-in plastic strips that look cheap. Astragal bars are slim, structural bars bonded directly to the outside of the glass with a matching internal bar — far more convincing, closer to original Victorian and Georgian joinery. We fit astragal bars as standard.
Engineered for the UK — homeowners, builders and installers
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Authentic astragal bars
Bonded to the outside of the glass — period-correct and slim, casts a proper shadow on the glass.
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Any bar layout
Georgian 6-over-6, Victorian 2-over-2, Crittall grid, arched — we match what you have.
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Part L compliant
1.2 W/m²K as standard, even with the heritage bar — passes building control every time.
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Listed & conservation approved
Slim frame reads just like original joinery. We supply consent-ready drawing packs.
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Heritage colours
Off-white, cream, heritage green, sage, anthracite, black — the period palette.
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Flush-sash casement
The opening pane sits flush — unlike any modern uPVC. Available stepped or flush.
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Secured By Design
PAS 24 tested, anti-lift rollers, key-lockable handles.
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Matching heritage doors
Complete the look with our heritage entrance door range — one elevation, one bar style.
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10-year guarantee
Frames, hardware and gaskets — tested to 25 years of service life.
Heritage windows in real period and conservation homes
Real UK installations of our astragal-bar heritage windows — Victorian terraces, Georgian town houses, Cotswold cottages and character new-builds.
Bonded to the outside of the glass give an authentic Victorian or Georgian look that planners approve on sight.
Same slim sightlines as original joinery — no rot, no repainting, modern thermal performance.
Slim frame and thin bars recreate the light and feel of an original window.
Heritage windows that pass the planner’s eye
Heritage windows are a specialist product. You need a look that reads as authentic from the street, paired with modern thermal performance that passes Building Regulations. Get either wrong and the project slows.
Why heritage aluminium and not timber?
Traditional timber sash windows look lovely on day one. By year three they need repainting. By year ten they often have rot at the cill. By year twenty many have warped enough that they stick. Heritage aluminium looks identical from the street thanks to the slim frame and bonded astragal bar, but does not rot, warp, or need repainting.
Astragal bar vs Georgian bar — the detail that matters
Planners and conservation officers know the difference. A clipped Georgian bar sits inside the window and looks plastic. An astragal bar is bonded to the outside of the glass with a matching internal bar — looks like a real muntin dividing real glass panes from any angle. Casts a proper shadow on the glass, which is what makes an old window feel old.
What bar layout do I need?
Georgian 6-over-6 is classic Georgian town-house. Victorian 2-over-2 is from c.1860 onwards. Astragal with a single horizontal bar is Edwardian. Crittall is the industrial steel-window grid of 1920s–50s, now hugely fashionable on new builds. Send us a photo and we’ll match it.
Part L on a listed or conservation property
Part L still applies — most conservation replacements need 1.4 W/m²K or better. Our heritage aluminium achieves 1.2 W/m²K with the bar, so you’re compliant every time. Slim-profile 10 mm argon-filled units available if your officer grants a single-glazed exemption on Grade II*/I buildings.
Listed building consent — how we help
We’ve guided more than a hundred homeowners through this. We supply drawings, elevations, product brochures, U-value tables and glass specification sheets for your planning application. Conservation areas don’t usually need separate consent but the same pack works for council review.
Colours that suit period homes
Heritage Green (close to RAL 6009 Fir Green) is the most-requested heritage colour in the UK. Off-white (close to RAL 9010) suits Georgian. Cream (RAL 9001) works on Cotswold cottages. Sage and Moss Green suit country homes. Jet Black suits Crittall-style. Anthracite is the flexible modern choice.
Stepped or flush casement?
A flush casement has the opening sash level with the outer frame — the purest period look. Stepped suits strict conservation requirements where the planner wants the old drip-bar profile. Flush is slightly cheaper and suits most other period homes.
Matching doors
A heritage window elevation looks best with a matching heritage entrance door. Traditional moulded designs with matching astragal-bar top lights and side lights — entire elevation in one colour and bar style.
The astragal bar — up close
See how the slim heritage bar sits flush on the outside of the glass. It’s a detail that transforms a window from “modern replacement” to “always been there.”
Recent installations
A small selection of recent work. Ask for our full portfolio on your site visit.
6-over-6 Georgian bars, Heritage Green.
Astragal 2-over-2 bars, Cream finish.
Full elevation — 12 heritage windows + door.
Astragal-bar flush casement throughout.
Crittall grid, Jet Black, full elevation.
3-over-3 Georgian bars + heritage entrance door.
Trusted by homeowners & builders across the UK
“We live in a conservation area and the planners insisted on authentic-looking windows. GWS heritage aluminium gave us that look with double-glazed performance. Everyone who visits thinks they are original.”
“I used to fight with timber sash suppliers on lead times and warping. GWS heritage aluminium has become my default — zero comebacks in 18 months.”
“We went full heritage aluminium on our barn conversion — Crittall look on black. Stunning. Every visitor asks where we got them.”
Take the heritage look inside — slim glass internal doors
Astragal bars and slim black aluminium don’t have to stop at the outside wall. Our matching glass internal doors bring the same Crittall-style grid into the house itself — between the kitchen and the snug, between the hall and the lounge, between the study and the family space.
Use slim internal bifolds or sliding doors with a heritage bar grid and you connect every room with light while keeping the option to close off a space when you need quiet. Same slim aluminium frame, same bonded astragal bar detail, same hardware — just sized for internal openings.
Premium hardware, colour-matched to every frame
Period-correct espagnolette window handles, key-lockable Rondo handles, and matching levers and pulls in finishes that complement your heritage colour.
Period-correct inline window handle. Available in Anthracite, Black, White, Polished Chrome, Satin Silver, Brushed Gold.
Child-safe keyed window handle — ideal for upstairs bedrooms in heritage rentals.
Smooth ergonomic and Quadra square-edge — finishes to complement Heritage Green, Cream, Sage and Black.
Anti-snap TS007 3-star cylinders, hook bolts and deadlocks on every door as standard.
Period colours, powder-coated to last
Every frame finished to order with Qualicoat-approved powder coating. Heritage palette draws on the most-loved colours from Georgian, Victorian and Edwardian joinery.
RAL 6009 Fir Green — the most-requested heritage colour
RAL 9910HG — suits Georgian town houses
RAL 9001 — Cotswold cottages and period country homes
RAL 6005 — country homes, barn conversions
RAL 9005M — Crittall-style and industrial conversions
RAL 7016M — flexible modern heritage choice
RAL 3009 — bold traditional period statement
RAL 1011 — soft period neutral, conservation friendly
More ways we transform homes & builds
Your builder can fit them — or we will
Supply-only to trade (trade pricing, full technical pack) or a white-glove install by our in-house team. Same 10-year guarantee on hardware and frames either way.
