Short answer: choose real steel when the fine bar, the metal and the building justify it — often inside, or on a project that has priced true steel. Choose steel-look aluminium when you want the grid and a thermally broken frame at a specification you can survey and guarantee like other aluminium. They are not the same section, and they should not be the same quote.
The short answer
“Crittall-style” has become a mood. The original idea is a slim steel frame with a grid of small panes, common in 20th-century houses, factories and extensions. True steel windows are still made. Aluminium systems can reproduce the look with applied bars or with a frame designed to read as steel. From a phone photo they confuse people. On a sample, and on a price schedule, they do not.
Around Staffordshire and Cheshire we specify both conversations properly: steel-look aluminium where the house needs slim lines and modern thermal performance in a known system, and a clear warning when someone has been sold “steel” that is a clip-on bar on a standard casement. If the bar is stuck to one pane of glass, say so.
What real steel is asking of the building
Steel frames can be exceptionally fine. That fineness is the point, and it comes with glazing, finish and installation that are specialist. Cold bridging, condensation on metal, and maintenance of the coating are part of the product story. Modern steel systems may be thermally improved; do not assume a 1930s W20 replacement is the same section as a current insulated steel window. The quote should name the system.
Listed buildings and faithful refurbishments are where real steel earns its cost. If the existing frames are steel and the planner expects steel, aluminium with a similar colour is a different application. Get that answer before you fall in love with a cheaper grid.
What steel-look aluminium is good at
Thermally broken aluminium with a steel-look grid gives you slim sightlines, a powder-coated finish, and glass specifications that match the rest of a contemporary extension. It suits new openings, internal screens where fire and acoustics are designed properly, and external windows where you want the graphic of steel without claiming it is the historic product.
The bars might be structural muntins or decorative bars on the glass. Structural muntins change the glass sizes and the look of the joint. Decorative bars are cheaper and, in strong light, can show as applied. Neither is a fraud if the quote uses the right words. Both are a fraud if the quote just says “Crittall”.
Sightlines, colour and glass
Measure the sightline you actually want with your fingers on a sample. A few millimetres of extra frame is the difference between “factory window” and “ordinary aluminium with bars”. Colour is usually a dark RAL — black, bronze, a soft white on some internal screens. Dual colour is normal in aluminium and should be written as external and internal separately.
Small panes mean more edge spacer and more bar, so the glass area drops. That affects light and the energy figure. A steel-look window with huge single panes and one pretend bar is a design; a dense grid is a different design and a different price. Safety glass, solar control and acoustic builds still apply, especially beside doors and at low level.
Budget without a made-up price
We will not pretend one number covers a porch screen and a full rear elevation. Real steel moves the price because of the section, the finish, the glass and the people who fit it. Steel-look aluminium moves the price because of the system, the number of bars, the opening vents in the grid, and the size. Opening vents in a grid are dearer than fixed lights. A window that must tilt as well as look like steel is a hardware problem, not a sticker.
Compare two quotes only when both name the system, both draw the grid, and both include installation, cills and making good. A supply-only steel price against a supply-and-fit aluminium price is not a comparison. Access, scaffold and the state of the opening belong on both.
Internal screens are a different job
A steel or steel-look screen between a kitchen and a stair is not an external window. Fire, guarding, acoustics and how it fixes to the floor and the ceiling matter. An external-rated window stuck in a doorway can look right and be the wrong specification. If the screen is only visual, say so. If it is a barrier, the quote needs to say what it is resisting.
What to demand on the drawing
- Named system: steel or aluminium, not “style”
- Bar layout, which lights open, and which are fixed
- External and internal colour
- Glass specification and any safety or solar requirement
- Cill, threshold and how the frame meets the structure
- Who designs the opening and who fits
- Finish warranty and installation warranty, separately
When to book a survey
Book a survey when you have an opening, a listed façade, or a picture of a grid you want to live with. Bring that picture. We will tell you if it is achievable in steel-look aluminium, if it wants true steel, or if a simpler slim frame without a fake grid is the better-looking window. Samples in the showroom beat a social-media crop.
We work across Staffordshire and Cheshire. The written quote will separate fixed screens from opening lights so you can see what the grid is costing you.
Questions we hear on survey
Is steel-look just a bar on normal glass?
Sometimes that is what is being sold. Ask. A bar on a single unit is not the same as a grid of separate panes or a true steel section.
Will steel windows run with condensation?
Cold metal can. Modern systems reduce that; they do not repeal physics in a wet kitchen. Ventilation and the thermal break belong in the specification.
Can I have opening windows inside the grid?
Yes, if the system allows that light to be a vent. It changes hardware, safety and price. Point at the lights you need to open for escape or for a breeze.
Which should a new extension use?
Usually a thermally broken aluminium system, steel-look if you want the grid. True steel is a deliberate upgrade or a planning requirement, not the default because the render is white.
