Visaglaze, bespoke windows and doors

Heritage steel-look windows and doors

The slim lines, glazing bars and proportions of traditional steel windows, with the warmth, security and low maintenance of modern aluminium. From AluK and Smarts, installed by Visaglaze.

AluK Heritage steel-look double entrance doors in a brick porch
Black steel-look French doors with leaded lights, open to a patio
Art Deco building with Smarts Alitherm Heritage windows

Why heritage aluminium?

Original steel windows are elegant but often draughty, cold and corroding. Heritage aluminium keeps the look and fixes the problems.

Where it suits

Listed buildings and conservation areas, 1930s and Art Deco homes, mansion blocks and warehouse conversions — and modern kitchens and extensions that want an industrial look.

Like-for-like detail

Slim frames, putty-line or stepped profiles, Georgian bars and period handles match original steel windows closely.

Modern performance

Thermally broken frames with U-values down to 1.1 W/m²K, multi-point locking, PAS 24 security and powder coatings that won't rust.

The heritage range

Two families of steel-look systems, so we can match the building, the budget and the details you want. Download a datasheet for any system.

SystemProductsSightlineU-value (W/m²K)Security
AluK 58BW ST HI HeritageWindows43mm fixed · 66mm frame to vent1.4 double · 1.1 triplePAS 24, Secured by Design
AluK Heritage doorSingle and French doors51.7mm1.4PAS 24:2022 (single door)
Smarts Alitherm HeritageWindows and doors59mm typical1.6PAS 24:2016, Kitemarked
Smarts Alitherm Heritage 60Single and French doorsSlim steel-look1.4 double · 1.1 triplePAS 24:2016
Smarts Visofold 1000 heritage sashBifold doors122mm typical1.4PAS 24:2022, subject to spec
Smarts AluSpaceInternal doors and screens35–69.5mm–Internal use
Drawing of an AluK steel-look heritage window with Georgian bars

AluK

58BW ST HI Heritage window

An open-out casement made to look like a traditional steel window, with the same narrow frames. It shares profiles and parts with the AluK Heritage door, so a whole house can be done in one matching range.

U-value1.4 W/m²K double glazed · 1.1 W/m²K triple glazed
Window Energy RatingA–B
Sightlines43mm fixed light · 66mm frame to vent · 81mm vent to mullion
Profile stylesPutty Line, Stepped Edge, Square or Exterior Glazed Chamfer
Opening typesTop hung, side hung, fixed and multi-light (open-out)
Max sizesTop hung 1436 × 1336mm · Side hung 736 × 1436mm
SecurityPAS 24; Secured by Design
OptionsGeorgian bars, odd-leg frames, heritage frames for stone mullions, trickle-vent heads

Download the datasheet (PDF)

AluK Heritage double doors

AluK

Heritage door: single & French doors

A slim steel-look entrance door with 51.7mm sightlines throughout. Add fanlights, sidelights and a slim matching transom to build a complete glazed screen.

U-value1.4 W/m²K, Part L compliant
Single doorOpen-out, up to 1000 × 2300mm
French doorsOpen-in, up to 2000 × 2300mm
Glazing24–28mm double glazed
SecuritySingle door PAS 24:2022 +A1:2024; lift-lever lock with cylinder
HandlesPeriod styles in Matt Black, Antique Bronze, Heritage Black or Heritage Pewter

Download the datasheet (PDF)

Smarts Alitherm Heritage windows on an Art Deco building

Smarts

Alitherm Heritage windows

Slim aluminium windows designed to replace steel windows, built as stacked modules with a drip bar between them. 316 marine-grade stainless hardware in Heritage and Art Deco styles.

U-value1.6 W/m²K
Window Energy RatingB
Frame depth47mm
Typical sightline59mm
Opening typesSide hung, top hung, tilt & turn, fixed and multi-light
SecurityPAS 24:2016 casements and fixed lights; BSI Kitemarked

Download the datasheet (PDF)

Smarts Alitherm Heritage 60 steel-look French doors

Smarts

Alitherm Heritage 60 French & single doors

Steel-look doors with an enhanced thermal break — a like-for-like replacement for steel doors that sits alongside Alitherm Heritage windows. Open-in or open-out.

U-value1.4 W/m²K double · 1.1 W/m²K triple
Door Energy RatingA (triple glazed)
Single doorUp to 900 × 2100mm
French doorsUp to 1800 × 2100mm
Frame depth67.5mm
SecurityPAS 24:2016; multi-point locking

Download the datasheet (PDF)

Smarts Visofold 1000 bifold with heritage-style sash and glazing bars

Smarts

Heritage bifolds: Visofold 1000 & 6000

Visofold 1000 now offers a heritage-style sash (DV225) that matches Alitherm Heritage. Visofold 6000 is Smarts' slimmest bifold, with a 94mm sightline and level-access threshold.

Visofold 1000 leavesUp to 1200 × 2500mm; U-value 1.4 W/m²K
Visofold 6000 leavesUp to 1000 × 2200mm; U-value 1.5 W/m²K
Sightline122mm typical (1000) · 94mm (6000)
FoldingIn or out; low, rebated or level threshold

Download the Visofold 1000 datasheet (PDF)

Smarts AluSpace steel-look internal screen with door

Smarts

AluSpace internal doors & screens

Crittall-style internal glazing for kitchens, living spaces and home offices — hinged, pivot, sliding or fixed, with the same slim steel look.

Sightlines35–69.5mm
Hinged doorsUp to 900 × 2200mm, single or double
Pivot doorsUp to 2000 × 2500mm
Sliding doorsUp to 1200 × 2500mm
Fixed screensUp to 1400 × 2500mm

Download the datasheet (PDF)

Heritage-style projects

Black, slim-framed French doors, bays and windows with leaded lights on period homes.

Black steel-look French doors with leaded lights, open to a patioBlack heritage-style windows on a rendered cottageBlack heritage-style French doors and side lights in a bayBlack heritage-style bay with leaded lights

Getting the details right

Glazing bars and layouts

Georgian bars, transoms and mullions recreate the pane layouts of original steel windows. We'll match the bar pattern to the existing windows or the period of the house.

Planning and conservation areas

Slim sightlines and like-for-like detailing are what conservation officers usually look for. We can provide drawings and product details to support an application.

Hardware

Period-style handles in black, bronze and pewter finishes (AluK), and 316 stainless steel Heritage and Art Deco hardware (Smarts).

Glass

Double or triple glazing, with toughened or laminated safety glass and obscure or acoustic options.

Popular heritage colours

Black RAL 9005

Anthracite RAL 7016

Black-green

Bronze

Pewter grey

Off-white

Any RAL colour, textured and dual-colour finishes are available. Screen colours are a guide only.

Heritage brochure and datasheets

  • Heritage steel-look windows & doors

    AluK and Smarts heritage windows, French and single doors, bifolds and internal screens.

    Heritage · PDF · 9 pages · 2.6 MB
    Download

Datasheets

  • Smarts Alitherm Heritage

    Steel-look windows and doors.

    Heritage datasheet · PDF · 2 pages · 0.8 MB
    Download
  • Smarts Alitherm Heritage 60

    Steel-look French and single doors.

    Heritage datasheet · PDF · 2 pages · 0.6 MB
    Download
  • Smarts AluSpace

    Steel-look internal doors and screens.

    Heritage datasheet · PDF · 2 pages · 0.6 MB
    Download
  • AluK 58BW ST HI Heritage window

    Steel-replacement casement windows.

    Heritage datasheet · PDF · 2 pages · 0.5 MB
    Download
  • AluK Heritage door

    Steel-look single and French doors.

    Heritage datasheet · PDF · 2 pages · 0.4 MB
    Download

Heritage questions

Can I use aluminium heritage windows in a conservation area?

Often, yes. Heritage aluminium systems are designed to replicate steel windows like-for-like, which is what planners usually look for. Listed buildings and some conservation areas need consent first, so we can supply drawings and product details to support your application.

What's the difference between the AluK and Smarts heritage ranges?

Both give a slim steel look. AluK's 58BW ST Heritage window has very slim 43mm fixed-light sightlines and a choice of putty-line, stepped, square or chamfered profiles, with a matching Heritage door. Smarts Alitherm Heritage uses stacked modules with a drip bar, and pairs with Heritage 60 doors, heritage-sash bifolds and AluSpace internal screens. We'll recommend the best fit for your building.

Can I have heritage-style French doors or a single back door?

Yes. AluK's Heritage door and Smarts' Alitherm Heritage 60 both come as single doors and French doors, with fanlights and sidelights available to make a full glazed screen.

Are heritage bifold doors available?

Yes. Smarts Visofold 1000 has a heritage-style sash that matches Alitherm Heritage windows. For the slimmest frames, Visofold 6000 has a 94mm sightline.

Do steel-look internal screens need Building Regulations approval?

Internal screens like AluSpace are not thermal elements, but safety glass is required in critical locations. We'll specify the right glass for doors and low-level panes.

Planning heritage windows or doors?

Send us a few details — the property, what you'd like replaced or added, and any photos — and we'll come back to you to arrange a survey and quotation.