Bespoke Steel Windows
Designed, Manufactured & Installed in the UK
Slimline W20 steel windows engineered for luxury homes & architectural projects
Typical projects range from £6,000 – £30,000 depending on openings & specification.
Fast lead times • British made • 5-year warranty
Fast Lead Times
5 Year Warranty
Bristish Made
UK-Wide Installs
Rated 5 Star by Homeowners & Architects
Custom-Made Steel Windows in the UK
Every building is unique, which is why we offer bespoke steel window solutions across the UK. From size and style to finish and glazing options, our custom-made windows are tailored to meet your exact specifications. Whether for a residential renovation, new build, or commercial project, our skilled craftsmen ensure each window delivers superior quality, aesthetic appeal, and performance.
Why Choose Slimline W20 Steel Windows?
Our W20 system is the go-to choice for architects, designers, and homeowners seeking sleek, robust steel windows.
Its ultra-slim sections allow for large glass areas, multi-panel layouts, and curtain walling, all while maintaining exceptional durability.
Perfect for new builds or high-end renovations, W20 steel windows bring cutting-edge style together with proven performance.
Designed with slim sightlines, these windows maximise natural light and create a contemporary aesthetic without compromising structural strength.
They are ideal for both heritage and modern buildings, offering excellent thermal efficiency, long-lasting finishes, and minimal maintenance. With W20 steel windows, you get timeless style paired with engineering excellence, making them a standout choice for any project.
Our Heritage SMW Steel Window Range
Our SMW range is designed for projects where preserving a building’s original character is essential.
Based on traditional steel window sections still manufactured to their original profiles, SMW windows provide authentic proportions and slim sightlines while accommodating modern double glazing.
This means period properties can benefit from today’s energy efficiency standards, security, and durability without compromising historic aesthetics.
Available in a variety of configurations, finishes, and glazing options, the SMW range allows architects, homeowners, and developers to restore or enhance heritage buildings with precision-crafted, timeless steel windows.
Steel Window Manufacturers for Homes & Architects
As leading steel window manufacturers, we work closely with homeowners, architects, and builders to deliver solutions that combine design flexibility with precision engineering. Our windows are ideal for contemporary homes, historic restorations, and commercial projects alike. With a focus on quality, durability, and attention to detail, we provide steel windows that enhance both the appearance and functionality of any property.
Styles, Finishes & Flexibility
Whether you’re creating a contemporary showcase or restoring a heritage building, Jack Nicholas Windows & Doors can tailor the perfect solution. We offer a full palette of RAL colours, bespoke finishes and hardware options to achieve your vision.
Window Range at a Glance
SMW Windows – Classic design, heritage performance
W20 Windows – Contemporary look, ultra-slim frames
Custom Colours – Durable powder-coated finishes in every RAL shade
Why Choose Jack Nicholas Steel Windows
At Jack Nicholas Windows & Doors, our steel windows are hand-crafted to your exact requirements, blending minimalist frames with outstanding performance.
Every unit is engineered for strength, energy efficiency and longevity while keeping sightlines as slim as possible.
The result? More daylight, cleaner aesthetics, and a seamless fit with both modern and period properties.
With our streamlined production process, we also deliver some of the quickest turnaround times in the industry.
Examples of our work
Turning enquiries into perfectly fitted steel windows
Our Process
FAQ's
Q1: Do you offer bespoke sizes?
Yes, every product we manufacture is made to measure to fit your exact requirements.
Q2: Are your products energy efficient?
Absolutely — our steel and aluminium windows and doors are designed with high thermal performance to help reduce energy costs.
Q3: Do you provide installation services?
Yes, our in-house team of experts manage the process from design through to professional installation.
Q4: What finishes are available?
We offer a wide range of powder-coated colours, glazing options, and hardware finishes so you can fully customise your product.
Q5: Warranty
We provide a comprehensive five-year warranty on all fully sealed products, ensuring long-term quality and peace of mind.
Working hours:
Monday – Friday: 8:00 – 18:00
Address:
Jack Nicholas Group
The Crows Nest
Clothall Bury
Nr Baldock Herts
SG7 6RJ
JN Windows & Doors is part of Jack Nicholas Group