Heritage windows
Fixed lights, casements and pivots on 25-40mm sightlines, with authentic T-bar grids sized to your elevation, not a standard catalogue split.
Crittall style · Slim aluminium heritage
Steel look windows in London, drawn with a finer line.
Glazing London surveys, supplies and installs steel look windows across London: slim aluminium Crittall style frames in jet black, with true heritage sightlines, double glazing and FENSA certification. Warehouse style glazing for conversions, extensions and 1930s houses, with a free survey. Call 07399 253464, we answer 24/7.
No. 01
Aluminium that keeps the steel discipline
Original Crittall windows were hot-rolled steel: beautiful lines, terrible thermals, and rust that never sleeps. What we fit today is slim aluminium heritage glazing, thermally broken profiles powder-coated in RAL 9005 jet black (or any RAL you like), with glazing bars applied to both faces of the sealed unit so the grid reads as real from inside and out. You keep the drawing; you lose the condensation, the flaking paint and the single glazing. A typical double-glazed unit achieves around 1.4 W/m²K, and genuine steel W20 style sections can still be sourced where a conservation officer insists.
No. 02
Panel I
Panel II
Panel III
Where the grid belongs
Steel look glazing earns its keep on warehouse and school conversions that were born industrial, on 1920s and 1930s London houses originally glazed in steel, and on rear extensions where a black grid against stock brick does most of the architecture for you. It also works indoors: fixed screens and glazed partitions that split a kitchen from a snug without stealing the light. If your street sits in a conservation area, start with our conservation area windows guide, because glazing bar layout and reveal depth are exactly the details planners check.
Crittall style doors
French doors, single doors and full-height screens, double glazed and multi-point locked, so the industrial look meets modern security.
Internal partitions
Broken-plan dividers and glazed walls, single glazed where fire rules allow, matching the external grid line for line.
No. 03
The heritage details that give the game away
A convincing steel look window is a set of small decisions. Glazing bars must be applied to both faces with a spacer bar in the cavity, never stick-on internal grilles that vanish at an angle. Corners should be crisply welded, not chunky and radiused. The black should be a fine-textured matt powder coat, because gloss reads as plastic from the pavement. Handles want to be slim cranked levers, not chunky inline pulls. We spec all of this at survey, and because we also fit contemporary aluminium windows and doors and timber-look sash windows, the advice on which system suits your elevation is given on merit, not on what happens to be in stock.
No. 04
Survey to certificate
A free laser-measured survey fixes sizes, grid layout and colour. Frames are typically ready in 3-4 weeks, and fitting a rear elevation takes a day or two. Every qualifying installation is registered with FENSA for Building Regulations self-certification and covered by an insurance-backed guarantee, with public liability insurance through Simply Business. And if a pane gets broken before or after the job, our 24/7 emergency glazing team handles it at any hour.
Questions
Steel look windows, answered
Are steel look windows actually made of steel?
Usually not. Most of what we fit in London is slim aluminium heritage glazing: thermally broken aluminium profiles powder-coated jet black, with applied glazing bars that reproduce the Crittall grid. You keep the fine sightlines but gain double glazing, better U-values around 1.4 W/m²K and zero rust maintenance. Genuine steel W20 style frames can be sourced for strict conservation jobs.
How slim are the sightlines on Crittall style windows?
Our slim aluminium heritage systems run roughly 25-40mm at the frame and around 25mm at the glazing bars, close to original steel sections and far slimmer than the 70mm plus you see on standard aluminium or uPVC. That is what keeps the industrial grid looking authentic.
Do steel look windows suit period and warehouse properties?
Yes, that is their natural home: warehouse and school conversions, 1920s-30s houses originally glazed in steel, and rear extensions on Victorian terraces where a black grid reads beautifully against brick. In conservation areas we prepare drawings and specifications the planners can approve; see our conservation area glazing page.
Can I get Crittall style doors and internal screens too?
Yes. The same profile family builds French and pivot doors, fixed screens and internal glazed partitions, so a broken-plan kitchen divider can match the rear glazing exactly. Internal screens can be single glazed; external doors are double glazed and multi-point locked.
Are heritage steel look installations FENSA certified?
Every qualifying replacement window and door we install is registered with FENSA for Building Regulations self-certification, and the work is backed by an insurance-backed guarantee and our public liability cover through Simply Business.
Browse the full window and door installation range, or go straight to a free survey and quote.