Business Details
35 Years
experience
Your Trusted Partner for High-Performance Fenestration Solutions
Senior Architectural Systems is one of the UK's leading fenestration systems companies, established in 1991 with a commitment to innovation and excellence. Our expertise lies in designing and manufacturing high-performance aluminium window, door, and curtain wall systems that combine thermal efficiency, security, and aesthetic appeal. We pioneered the PURe range with polyurethane thermal barriers, achieving some of the lowest U-values in the industry while maintaining structural integrity. Our vertically integrated operations include in-house powder coating facilities accredited to ISO 9001, ISO 14001, and ISO 45001 standards, ensuring quality control and environmental responsibility throughout production.With 30 years of experience and a nationwide project portfolio spanning commercial, residential, and public sectors, we provide complete system solutions supported by technical expertise and 25-year coating warranties. Our dedication to sustainability is demonstrated through responsibly sourced materials, recyclable aluminium systems, and energy-efficient manufacturing processes that reduce carbon footprints. As an employer, we invest in staff development and maintain a 220,000 sq ft operational footprint across three UK sites, delivering nationwide service through a dedicated branch network and technical sales team.
Services
Windows
Doors
Curtain Wall
Shopfront
Roof Glazing
Secondary Glazing
Powder Coating
Thermal Break Systems
Aluminium Fabrication
Project Support
Details
- Year established: 1991
Highlights and features
- 30 years of fenestration innovation since 1991
- Patented PURe polyurethane thermal barrier technology
- 25-year coating warranty with ISO-certified quality
- UK's largest in-house powder coating facility
- Nationwide project delivery with local technical support
Associations and certifications
- ISO 9001
- ISO 14001
- ISO 45001
Services
Aluminium Windows
Our aluminium window systems combine slim sightlines with thermal efficiency, featuring polyamide or polyurethane thermal breaks. Available in multiple configurations including casement, tilt/turn, and parallel action designs, they offer security, durability, and aesthetic flexibility. Suitable for new builds and refurbishments across residential and commercial sectors.
Thermal Break Doors
High-performance door systems with polyamide or polyurethane thermal barriers provide exceptional insulation while maintaining security. Options include swing, folding, and sliding configurations with PAS 24 compliance and low U-values. Ideal for both domestic and commercial applications requiring energy efficiency.
Curtain Walling
Aluminium curtain wall systems offer structural versatility and aesthetic customisation for commercial buildings. Available in semi-unitised and stick systems with thermal enhancements, they accommodate complex architectural designs while meeting stringent performance standards for thermal efficiency and weather resistance.
Powder Coating
In-house powder coating facilities apply durable, environmentally responsible finishes to BS EN 12206-1 standards. We offer full RAL colour matching, dual-colour options, and enhanced coatings for marine environments, all backed by 25-year warranties and ISO-certified quality control.
Secondary Glazing
Cost-effective secondary glazing systems improve thermal and acoustic performance of existing windows without replacement. Available in vertical and horizontal slider configurations with concealed fixings, they provide heritage-compliant upgrades for listed buildings and period properties across the UK.
People
Lennart Jonsson
Chairman of the Board
Founder of the UK's leading fenestration systems company, Lennart Jonsson established Senior Architectural Systems in 1991 with a vision for industry transformation through innovation and customer care.
Phil Guy
National Sales Manager
With extensive industry experience, Phil Guy leads national sales operations after being promoted to this strategic role in May 2025, overseeing technical sales managers across the UK.
Questions
What fenestration systems do you specialise in?
We specialise in aluminium windows, doors, curtain walls, shopfronts, roof glazing, and secondary glazing systems for commercial and residential projects.
How do your thermal break technologies improve performance?
Our patented PURe® polyurethane thermal barrier and polyamide systems significantly reduce heat loss while maintaining structural integrity and security.
Are your products environmentally responsible?
Yes, our systems use recyclable aluminium, responsibly sourced materials, and energy-efficient manufacturing processes with ISO 14001 certification.
Do you offer custom colour finishes?
We provide full RAL colour matching with 25-year warranties, including dual-colour options for interior/exterior surfaces.
What support do you provide for construction projects?
We offer technical sales managers, architectural advisors, BIM objects, CPD training, and nationwide delivery across the UK.
