Heritage
steel.
Period steel joinery was drawn impossibly thin. To match it, you need real steel again — not a thicker substitute pretending to be it.
A villa asks for lines
only steel can hold.
The fine, gridded windows of an older home were made in steel because nothing else could be drawn that thin and still hold the glass. Replace them in a thicker material and the proportions go wrong — the grid coarsens, the sightlines fatten, and the building loses the very character it was being restored for.
The honest match is steel again. Solid hot-rolled sections with a stepped-leg design, multi-lite grids drawn to the original divisions, finished in a heritage colour — so a retrofit reads as the window that should always have been there, not a modern frame in an old wall.
The slimmest steel
we make.
W20
The slimmest. Single-glazed.
The most slender profile. Solid hot-rolled steel sections with a stepped-leg design and material up to 5mm thick — where sightlines must all but disappear, on internal screens, heritage retrofits and mild-climate openings.
SF20
The standardised series. The accessible way into steel.
Our standardised, value-led series — the fastest, most accessible way into real steel. Fixed standard sizes in the slimmest sections, single-glazed, ideal for internal screens and sheltered openings. The simplest path to the steel look.
Done once. Done
properly.
W20 is single-glazed in the slimmest sections for heritage retrofits, internal screens and mild-climate openings; SF20 is the standardised, value-led way into the same steel look on standard sizes. Both carry the four-stage corrosion treatment and the 15-year durability line — a restoration you settle once.
Where a period home needs warmer performance on its exposed elevations, the thermal range carries the same family of sightlines forward — so a villa can keep its face to the street and gain a modern envelope where it matters.
Why replace period windows with steel rather than aluminium?
The fine, gridded windows of an older home were made in steel because nothing else could be drawn that thin and still hold the glass. Replace them in a thicker material and the grid coarsens and the sightlines fatten. The honest match is steel again — multi-lite grids drawn to the original divisions.
Which suites suit heritage work?
W20 is single-glazed in the slimmest sections we make — for heritage retrofits, internal screens and mild-climate openings. SF20 is the standardised, value-led way into the same steel look on standard sizes.
Will heritage steel windows last in New Zealand conditions?
Both heritage suites carry a four-stage corrosion-protection process and the 15-year durability line. In harsh coastal exposure expect to clean and inspect quarterly — the same as your cladding and roofing.
Can a period home get warmer performance without losing its face?
Yes — where a period home needs warmer performance on its exposed elevations, the thermally broken range carries the same family of sightlines forward, so the villa keeps its face to the street and gains a modern envelope where it matters.
Warmer elevations without losing the lines: thermally broken steel windows, or see the full FAQ.
Don’t wait. Plan ahead.
Steel joinery is complicated to make — every joint welded, ground and finished by hand. Bring us in early with your architect and the timeline takes care of itself. Specify it at the start, not the end.