Bespoke Steel Windows & Doors | London
Timeless Steel
meets Modern
Architecture
Britannia Frames designs, manufactures, and installs bespoke Crittall-style steel windows and doors. Experience the perfect blend of heritage aesthetics and contemporary performance.
25 Year
Warranty
Bespoke
Made to Measure
Grade II
Listed Approved
Precision Engineered for Every Application
From ultra-slim internal partitions to thermally-broken external facades, our comprehensive range of steel profiles delivers uncompromising quality for heritage restorations and contemporary architecture alike.
Technical Cross Section - M20 Profile
M20
Minimal Sightlines, Maximum Impact
The M20 profile represents the pinnacle of slim steel frame design. With an ultra-narrow 20mm sightline, this profile delivers maximum glass area while maintaining exceptional structural integrity. Ideal for contemporary architectural projects where clean lines and unobstructed views are paramount.
Frame Depth
40mm
Sightline Width
20mm
Glazing Capacity
6mm single / 16mm double
Thermal Performance
U-value 5.7 W/m²K (single)
Acoustic Rating
32dB Rw
Max Dimensions
2,500mm × 1,200mm
The Britannia Difference
With nearly four decades of experience, we combine traditional craftsmanship with modern precision engineering to deliver steel fenestration of uncompromising quality.
Design Consultation
Our architectural team works with you from concept to completion, ensuring every detail meets your vision and technical requirements.
British Manufacturing
All frames are manufactured in our London workshop using premium grade steel, guaranteeing quality control at every stage.
Expert Installation
Our trained installation teams deliver flawless fitting with minimal disruption, backed by comprehensive project management.
25-Year Warranty
Every Britannia Frame is protected by our industry-leading 25-year warranty covering frames, finishes, and hardware.
Heritage Expertise
Specialist knowledge in working with listed buildings and conservation areas, satisfying the most stringent planning requirements.
Dedicated Support
From initial enquiry through to aftercare, a single point of contact ensures seamless communication throughout your project.
40+
Years Experience
2,500+
Projects Completed
98%
Client Satisfaction
25
Year Warranty
Craftsmanship in Every Detail
Explore our portfolio of completed installations across London and the South East, showcasing the timeless elegance of steel fenestration.
E50
Hampstead, London
W40
Chelsea, London
W10
Kensington, London
M20
Mayfair, London
SD50
Richmond, Surrey
B40
Notting Hill, London
M20
Shoreditch, London
W50TB
Fulham, London
W50TB
Highgate, London
W75TB
Belgravia, London
W75TB
Clerkenwell, London
B40
Knightsbridge, London
Premium Powder Coat Finishes
Choose from our curated palette of premium powder coat finishes, or specify any RAL colour for a truly bespoke result. All finishes include a 25-year guarantee against fading, chalking, and corrosion.
Standard Colours
Custom RAL Colours
Beyond our standard palette, we can match any RAL colour to complement your architectural vision. A small premium applies for custom finishes.
Contact us for custom colours →RAL 9005
Jet Black
The quintessential Crittall colour. A deep, rich black that provides timeless elegance and dramatic contrast.
RAL Code
RAL 9005
Hex Value
#0A0A0A
Finish Options
Downloads & Specifications
Access comprehensive technical documentation, specification sheets, and BIM files to support your architectural projects. All resources are regularly updated to reflect the latest product developments.
M20 Profile
Minimal Sightlines, Maximum Impact
W10 Profile
The Heritage Classic
W40 Profile
Versatile Performance
E50 Profile
Enhanced Energy Efficiency
W50TB Profile
Thermally Broken Excellence
W75TB Profile
Ultimate Thermal Performance
B40 Profile
Bronze & Brass Excellence
SD50 Profile
Sliding Door Specialist
Installation Guide
Comprehensive installation manual covering all profile types, weatherproofing, and finishing details.
NBS Specifications
Full NBS specification clauses for all Britannia Frames products, ready for insertion into your project documentation.
Complete BIM Library
Download our entire Revit family library including all profiles, colours, and hardware options.
Certifications & Accreditations
All Britannia Frames products are manufactured to the highest standards and carry full third-party certification.
ISO 9001
CE Marked
UKCA
Steel Window
Start Your Project Today
Whether you're an architect specifying for a new development, a homeowner planning a renovation, or a contractor seeking a reliable supply partner, our team is ready to assist with your steel window and door requirements.
Call Us
+44 (0)20 3695 4013Email Us
[email protected]Visit Our Showroom
Britannia Frames
1 Station Road
Teddington TW11 9AA
Opening Hours
Monday - Friday: 8:00 - 17:00
Saturday: By appointment
Sunday: By appointment