Part L ready - 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 windows give you both: an authentic astragal bar grid 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.
Why choose us over traditional timber sash heritage windows? Ours will not rot, will not need repainting every 3 years, and last 25+ years with zero maintenance. And because the aluminium frame is so slim, you get more glass than a timber heritage window - more light into the room.
Why choose us
Engineered for the UK - homeowners, builders and installers
Authentic astragal bars
Bonded to the outside of the glass - period-correct and slim.
Any bar layout
Georgian 6-over-6, Victorian 2-over-2, Crittall, arched - we do it all.
Part L compliant
1.2 W/m²K as standard, even with the heritage bar.
Listed & conservation approved
Slim frame reads just like original joinery.
Heritage colours
Off-white, cream, heritage green, sage, anthracite, black.
Flush-sash casement
The opening pane sits flush - unlike any modern uPVC.
Secured by Design
PAS 24 tested, anti-lift rollers, key-lockable handles.
Matching heritage doors
Complete the look with our heritage entrance door range.
10-year guarantee
Frames, hardware and gaskets.
Projects
Recent installations
A small selection of recent work. Ask for our full portfolio on your site visit.
Stone cottage, Cotswolds
6-over-6 Georgian bars, Heritage Green
Listed cottage, Cotswolds
Astragal 2-over-2 bars, Cream finish
Georgian restoration, Edgbaston
Full elevation - 12 heritage windows + door
Barn conversion, Shropshire
Astragal-bar flush casement throughout
Period farmhouse, Warwickshire
White sash-look heritage windows, blue heritage door
Townhouse, Lichfield
3-over-3 Georgian bars + heritage entrance door
What clients say
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."
Clare H.
Homeowner, Moseley
"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."
James R.
Heritage builder, Warwickshire
"We went full heritage aluminium on our barn conversion - Crittall look on black. Stunning. Every visitor asks where we got them."
Anna & Dev S.
Self-build, Shropshire
Buyer's guide
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 one wrong and the project slows. This short guide explains the choices and common traps.
Why heritage aluminium and not timber?
Traditional timber sash and casement 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 it does not rot, does not warp and does not need repainting. The powder coated finish carries a 25-year life. No maintenance, no rot, no worry.
Astragal bar vs Georgian bar - the detail that matters
Planners and conservation officers know the difference between a cheap clipped-in Georgian bar and a real astragal bar. A clipped bar sits on the glass inside the window and looks plastic. An astragal bar is bonded to the outside of the glass and has a matching internal bar - so from any angle it looks like a real muntin dividing real glass panes. It also casts a proper shadow on the glass, which is what makes an old window feel old. We use astragal as standard on this range.
What bar layout do I need?
Georgian 6-over-6 is a top sash with 6 small panes over a bottom sash with 6 small panes - the classic Georgian town-house look. Victorian 2-over-2 is a simpler grid - two tall panes in each sash - popular from about 1860 onwards. Astragal with a single horizontal bar is an Edwardian detail. Crittall is the industrial steel-window grid of 1920s to 1950s, full of small rectangular panes and now hugely fashionable on new builds. Send us a photo of what you have and we will match it.
Part L on a listed or conservation property
Part L still applies even on heritage properties. Replacement windows in most conservation buildings have to achieve 1.4 W/m²K or better. Our heritage aluminium achieves 1.2 W/m²K with the bar, so you are compliant every time. If your planning officer grants a single-glazed slim-unit exemption (sometimes used on Grade II* and Grade I buildings) we can also do slim-profile 10 mm argon-filled units that look like single glazing from outside.
Listed building consent - how we help
If your building is listed you will need listed building consent before replacing windows. We have guided more than a hundred homeowners through this. We will supply drawings, elevations, product brochures, U-value tables and glass specification sheets for your planning application. For conservation-area properties you usually do not need a separate consent but the council will still want to check the design. Same pack works.
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 town houses. Cream (RAL 9001) works on Cotswold cottages. Sage and Moss Green suit country homes. Jet Black suits Crittall-style and industrial conversions. Anthracite is the flexible modern choice.
What about flush casement heritage?
A flush casement heritage window has the opening sash level with the outer frame, just like a period joinery window. It is the purest period look. We offer both stepped and flush heritage casements. Stepped suits strict conservation requirements where the planner wants the old drip-bar profile. Flush suits most other period homes and is slightly cheaper.
Matching doors
A heritage window elevation looks best with a matching heritage entrance door. Our panel door range includes traditional moulded designs with matching astragal-bar top lights and side lights. You can have the entire elevation in one colour and one bar style - the upgrade homeowners love most.
How to quote
Take a photo of each window as it stands today and message us on WhatsApp using the QR code or the green WhatsApp button in the quote form. Tell us how many windows, what bar layout you want, and your favourite colour. We come back with a written quote within 24 hours. If it is a listed property we can often visit and produce the consent-ready drawing pack in the same visit.
See it in action
The astragal bar - up close
See how the slim heritage bar sits flush on the outside of the glass. It is a detail that transforms a window from 'modern replacement' to 'always been there'.
BOOK A DEMO AT YOUR PROJECT
Handles, Hinges & Locks
Premium hardware, colour-matched to every frame
Each door and window is finished with market-leading hardware multi-point locking, TS007 3-star anti-snap cylinders, stainless-steel running gear, concealed hinges, and a full range of lever, pull and key-operated handles. Hover any handle to see it enlarge. Mix and match to suit your home or project.
Lever - Anthracite
Smooth ergonomic lever in Anthracite Grey (RAL 7016M) - our most-specified door handle.
Lever - Matt Black
Matt Black lever for contemporary, architectural looks. Pairs with any frame colour.
Lever - White
Bright White lever for classic, clean interiors and traditional homes.
Lever - Polished Chrome
Polished Chrome lever - a timeless shine that suits modern and classic doors alike.
Lever - Satin Silver
Satin Silver lever for a soft brushed finish that hides fingerprints.
Lever - Brushed Gold
Brushed Gold lever for a warm, premium statement. Gorgeous with Anthracite frames.
Quadra - Anthracite
Square-edge contemporary lever in Anthracite Grey - clean architectural lines.
Quadra - Matte Black
Matte Black square-edge lever - the ultimate modern door handle.
Quadra - Matte White
Matte White square-edge lever - fresh, bright, contemporary.
Quadra - Polished Chrome
Polished Chrome square-edge lever for a mirror finish that lifts any door.
Quadra - Satin Silver
Satin Silver square-edge - subtle brushed sheen, easy care.
Quadra - Brushed Gold
Brushed Gold square-edge lever - on-trend warm metal tone.
Window - Anthracite
Espagnolette window handle in Anthracite Grey. Key-lockable option.
Window - Black
Black inline window handle - sleek and timeless. Child-safety key option.
Window - White
White window handle for traditional and modern casements alike.
Window - Polished Chrome
Polished Chrome window handle - a classic finish for any room.
Window - Satin Silver
Satin Silver window handle - a calm, practical, brushed finish.
Window - Brushed Gold
Brushed Gold window handle - a beautiful accent on heritage windows.
Lift & Turn - White
White lift-and-turn handle - simple, strong, classic.
Lift & Turn - Chrome
Chrome lift-and-turn handle - glossy, durable, easy clean.
Lift & Turn - Satin Silver
Satin Silver lift-and-turn handle - brushed finish for a modern look.
Lift & Turn - Brushed Gold
Brushed Gold lift-and-turn handle - a warm luxury statement.
Lift & Turn - Anthracite
Heavy-duty lift-and-turn handle for patio sliders and bifold traffic leaves.
Lift & Turn — Black
Black lift-and-turn handle - gym-grade multi-point gearing.
Lift & Turn — Jet Black
Deep matt black lift-and-turn for sliders and bifold traffic leaves.
Lift & Turn — Brushed Gold
Warm metallic statement handle for premium sliding doors.
Lift & Turn - Satin black
Soft-sheen black that hides fingerprints on busy doors.
Lift & Turn — Anthracite Grey
Colour-matched to RAL 7016 frames for a seamless look.
Rondo keyed handle
Child-safe keyed window handle - ideal for upstairs bedrooms and rentals.
Pull handle suite
Matching pull handle and escutcheon for entrance doors - bold or minimalist.
Concealed 3D hinges
Hidden when closed — adjustable in three planes for a perfect reveal for life.
Multi-point locking
Anti-snap TS007 3-star cylinders, hook bolts and deadlocks on every door as standard.
Colour Range
Over 200 colours — powder-coated, textured & gloss
Hover over any swatch to see its RAL code. We finish every frame to order — matt, gloss, metallic or textured. Can't see your shade? Any RAL is available.
Anthracite Grey
RAL 7016M
Anthracite Textured
RAL 7016 Matt T
Jet Black Textured
RAL 9005 T
Brushed Silver (Tex)
DB 701 T
Pewter (Textured)
RAL 7037 T
Brushed Aluminium
AY 2050
Any RAL or BS colour available to order — just ask. Dual-colour (different inside / outside) supported on all ranges.
Explore the Range
More ways we transform homes & builds
Bifold Doors
Slim aluminium folding doors, huge glass spans, engineered to glide for decades. Supply or fit.
Explore bifold doors
Glass Internal Doors
Bifold, sliding or pivot internal glazing — open-plan when you want it, quiet when you don’t.
Styles
bifold/slide/pivot
Explore glass internal doors
Replacement Conservatory Roof
Tiled, glass or hybrid roofs — turn the hottest-coldest room in the house into the favourite one.
Options
tiled/glass/hybrid
Explore replacement conservatory roof
Kitchen Extensions
Full-build rear and side extensions with trusted partner builders — concept to keys.
Explore kitchen extensions
Flush Windows
Completely flat external face — sash level with frame for a pure minimalist elevation.
Explore flush windows
Stepped Windows
Sculpted stepped profiles create layered shadow lines and real architectural presence.
Explore stepped windows
GWS Hybrid
Deliberate mixed spec: aluminium at the front, uPVC behind — same colour, smaller bill.
Explore GWS hybrid
Decorative Glazing
Bevels, leads, bars and textured glass — privacy levels and patterns to make every pane yours.
Explore decorative glazing
