What's the difference between W20 and W50 sections?

W20 is the traditional hot-rolled heritage section with roughly 20 mm sightlines — the definitive crittall-style look for period and listed work. W50 is thermally broken with a polyamide break, replicating that same slim appearance while taking double or triple glazing for modern energy performance. Heritage projects usually take W20; new build and retrofit usually take W50.

Are steel windows suitable for a listed building or conservation area?

They're often the section a conservation officer prefers, because slim steel is what was originally there. Consent is decided case by case by your local authority, so we work from whatever your planning officer or heritage consultant specifies and match the sightlines, opening pattern and finish accordingly.

Can steel windows be energy efficient?

Yes — with a thermally broken section. Our W50 profile carries a polyamide thermal break and takes double or triple glazing, which is what reduces heat transfer through the frame. Traditional W20 prioritises the heritage sightline instead, so where performance matters most we'll usually steer you to W50.

How much do bespoke steel windows cost?

Every job is priced individually — cost turns on the section, the number and size of apertures, opening lights, glazing spec and finish, so a per-window figure quoted before we've seen the drawings would be a guess. Send your elevations or a schedule through the form below and our estimating team returns a considered estimate.

Do you handle survey, delivery and installation?

Yes. We handle measuring, delivery and installation across mainland UK. Everything is manufactured in our own south coast workshop in North Mundham, Chichester — we're a British company making the product here rather than importing it.

What finishes and colours are available?

Any RAL colour, plus the bronze and specialist mesh finishes shown throughout our portfolio. Because the sections are fabricated to order, the finish is specified per project rather than picked from a short standard range.

Bespoke · Hot-Rolled · Made in Britain

Bespoke Steel Glazing Systems

Specialist manufacturers of fully bespoke steel windows and doors for residential and commercial properties, crafted from high-grade steel with the slimmest sightlines on the market.

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25+: Years of expertise
40: Five-star reviews
100%: Made in Britain
1: South Coast workshop

Featured Section

W50 · Thermally Broken

≈50mm

Sightline

Chichester · Est. workshop

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Portfolio · Case Studies

A selection of bespoke installations across the UK — from heritage homes to commercial shopfronts and internal screen dividers.

Residential

Glebe House

West Sussex

Dining area framed by full-height steel glazing.

Residential

Duchess Mews

London

Full-height steel doors in patinated bronze mesh.

Residential

Flintwell

Hampshire

Full-height steel doors opening to the garden.

Residential

Monkhams Drive

Essex

Kitchen steel window design with slim sightlines.

Residential

North Barn

South Downs

Steel-framed windows beneath a timber ceiling.

Commercial

Omorovicza Mayfair

Mayfair, London

Bespoke black steel shopfront for a luxury skincare boutique.

Commercial

Phillimore Court

Chichester

External steel windows for a period façade.

Internal

Pony Chase

Chichester

Temperature-stable steel wine cellar doors.

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Restoration

From tired frames to timeless steel.

We replace failing single-glazed and aluminium units with slim-profile steel — preserving period character while delivering modern thermal performance. Drag the bar to reveal the transformation.

→Like-for-like heritage sightlines
→Survey-matched to existing apertures
→Any RAL finish, factory-applied

After

Before

Heritage restoration — Chichester — drag to compare

Engineering · Hot-Rolled Profiles

Refined traditional crittall-style sections, high-performance thermally broken systems and fire-rated profiles — each crafted to meet building regulations without compromise on style.

Tap a card to plot its cross-section and live technical metrics.

W20 Heritage

W20

The iconic slim steel section. Refined, traditional sightlines crafted to meet building regulations — the definitive heritage and crittall-style profile.

Sightline: ≈ 20 mm
Section: Hot-rolled
Glazing: Single / IGU
Use: Heritage · Period

Steel windows crafted in the Chichester workshop

Directly employed craftspeople

South Coast Workshop

The Studio · Why Choose Us

From the selection of premium steel to meticulous finishing touches, each product is crafted with care. Our commitment to excellence is evident in every step — fully bespoke profiles suitable for residential, commercial, heritage and hospitality.

01

Unmatched Durability

Steel windows and doors are renowned for longevity and robustness, standing the test of time without compromising beauty. Resistant to weather and wear, they hold their strength for years.

02

Refined Elegance

Crafted with precision, our minimalist profiles enhance both classic and contemporary homes — sleek lines and clean sightlines that let natural light become a defining feature.

03

Tailored to Your Vision

Every home is unique. We work closely with you to customise each piece to your architectural style and personal aesthetic, in any RAL finish you choose.

Process · Survey to Install

We handle every step — from precise measuring to secure delivery and expert installation — ensuring your steel fits perfectly, wherever you are in mainland UK.

01
Consultation & Survey
We meet to understand your project, discuss options and carry out a precise site survey — flexibility in design from handle position to soft-close.
02
Design & Approval
Detailed drawings are produced for your approval. Choose your section, glazing and RAL finish with our team guiding every decision.
03
Workshop Fabrication
Your steel is fabricated by directly-employed professionals in our South Coast workshop — meticulous craftsmanship, made in Britain.
04
Delivery & Installation
We handle secure delivery and expert installation anywhere in mainland UK, fitted by the very team that made them.

Client Reviews

Trusted by homeowners, architects & contractors.

5.0

Excellent · 40 Google reviews

“We did so much research before we settled on Unique Steel Windows. They patiently answered all of my questions and welcomed me to their workshop before I ordered. The doors are so well made and beautiful — we'd do it all again in a heartbeat.”

BBethanyInterior Designer

“Compared to quotes from 5+ companies, Unique Steel Windows were easily the best on price and delivery time. Excellent communication and attention to detail. Highly recommend.”

JJamesHomeowner · Extension

“I did a lot of research into suppliers of steel heritage / crittall-style doors and they were competitive on price — and now it's installed, the quality is top notch. The attention to detail speaks to the pride they take in their work.”

BBenjaminHeritage Renovation

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Social · Instagram

A look at recent installations, workshop craft and finished projects — straight from our Instagram.

@uniquesteelwindows

Common questions

Straight answers on lead times, thermal performance and listed consent — the four things that decide most steel projects.

Not covered here? Call the workshop directly — you'll speak to someone who makes the windows, not a call centre.

02394 370020

: W20 is the traditional hot-rolled heritage section with roughly 20 mm sightlines — the definitive crittall-style look for period and listed work. W50 is thermally broken with a polyamide break, replicating that same slim appearance while taking double or triple glazing for modern energy performance. Heritage projects usually take W20; new build and retrofit usually take W50.

Estimating Portal

Specify your project, to the millimetre.

Built for architects and main contractors. Tell us about the project — our team reviews every detail and returns a considered estimate. We handle measuring, delivery and installation across mainland UK.

Direct line: 02394 370020
Estimating: Enquiries@uniquesteelwindows.co.uk
Workshop: North Mundham, Chichester · PO20 1JW

● 25+ yrs expertise● 40 five-star reviews● Made in Britain