Royal Stepped Window

A direct replacement for original steel windows our Royal Stepped windows closely replicate the traditional look and feel of original steel windows. These are an extremely slim line aluminium window, more secure and thermally efficient than original steel windows. The main outer frame of the window is just 33mm deep, the slim frame allows for a simple installation as it is not necessary to hide part of the frame to give a slimmer look. This simple installation is much quicker as there is no need to cut back plaster work, brick work or existing wooden frames.

As with all of our aluminium windows frame they come supplied with a polyamide thermal break as standard to increase the thermal performance of the frame. Our Royal windows are also fitted with thin krypton gas filled double glazing giving the same thermal performance of standard double glazing whilst achieving a similar look to single glazing. This windows is not only very thermally efficient but also has passed multiple security standards including BS7950 standard..



  • Design to look and feel like traditional steel windows.
  • 33mm slim frame depth, providing a simple replacement for steel windows.
  • Reduced costs compared to steel windows.
  • Enhanced thermal performance thanks to the thermal break and krypton gas filled units.
  • Suitable for installation into brickwork and existing timber subframes.
  • Suitable for use in heritage, conservation areas, period properties and listed buildings.
  • Colour matched trim available.


Glass Options

Standard clear glazing

Planitherm Total +, argon filled double glazing with a warm edge spacer. Centre pane U-value of 1.2 W/M2k.

Square Leaded

Traditional lead lights also known as lead lites combine small pieces of glass with lead detailing to create decorative panels.

Diamond Leaded

Manufactures in the same way as our square leaded glazing, our diamond leaded glass option give achieves a different look to the squre leads.

Horizontal Flat Astragal Bars

Our horizontal bars are designed to replicate traditional Georgian bars popular on 1930's art deco styled steel windows.

Overlapped Astragal Bars

Designed to replicate traditional Georgian bars, the vertical bars overlap the horizontal bars, and are fixed to the outside of the glass for an authentic look.

Butted Astragal Bars

Similar in design to our overlapped astragal bars, out butted astragal bars are meet in a cross to give a flush look.

Self Cleaning Glass

True self cleaning glass manufactured with a dual action coating. The dual action coating users UV rays to break down dirt and then utilises rain to wash it away.

Textured / Obscure Glass

Pilkintons textured and obscured glass available in a wide range of patterns.

Colour Options

Standard White
(KL9010 Gloss)

Standard Black
(KL9005 Matt)

Standard Brown
(KL8014 Matt)

RAL Example - Red
(RAL 3011 Matt)

All of our aluminium windows are polyester powder coated for a hard wearing low maintenance finished, complete with a 10 year guarantee.

Our Heritage windows are available in three standard colours including white, black and brown as weel as dual colour options. Our windows are also available in a single or dual colour RAL colour options giving you hudereds of options. We also can supply a silver annodised finish and some Hammerite style textured paint finishes.

Hardware Options

Classic Straight

Classic scroll

Traditional pegstay


Art Deco Handle

Dummy Parliament Hinges

Dummy butt hinge

Working Butt Hinge