Perla Windows

G-Series Steel Windows

Maximum light, visual continuity

Light, proportion, performance

The G-Series steel windows are designed for projects where light and proportion drive the architecture. Available in G2 and G3, the systems share the same disciplined aesthetic while differing in depth, performance and scale. Configurable across multiple opening types and fully customisable in glazing, ironmongery and finish, they combine visual precision with enduring strength.

Architectural flexibility

Engineered for variety without compromise. The G-Series range of slimline steel windows supports side-hung, pivot, fixed or opening configurations, with vent heights up to 3.0 m. Designers can express rhythm and proportion through slender sight-lines that maximise light while maintaining structural integrity.

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Tailored design & finish

Every element can be refined to match the architectural vision. Glazing options range from solar-control to acoustic and security specifications, with SDL / TDL bars, varied beads and hardware selections available. Finishes extend from natural steel to the full RAL and metallic palette, ensuring every frame contributes to a coherent design language.

Performance, matched to need

From 1.4 W/m²K in G2 to 1.0 W/m²K in G3, the G-Series delivers efficiency aligned to project requirements. Acoustic insulation, weather resistance and security performance provide confidence for both residential and commercial applications — systems engineered for longevity as well as precision.

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Explore the range

G2
Thermally-broken steel doors & windows

  • 1.4 W/m2K uValue
    Highly energy efficient slimline profiles

  • Up to 2.5m vent height
    Large vent sizes allow total design freedom

  • RAL finishes
    Powder-coated finishes in any RAL colour

  • Thermal barrier
    Heat-resistant reinforced insulating bars

Explore G2

G3
State-of-the-art steel doors & windows

  • 1.00 W/m2K uValue
    Highly energy efficient slimline profiles

  • Up to 3m vent height
    Large vent sizes allow total design freedom

  • RAL finishes
    Powder-coated finishes in any RAL colour

  • Thermal barrier
    Heat-resistant reinforced insulating bars

Explore G3

Lukasz Jagiello
Office Assistant

lukasz@perlawindows.com
+44 0 203 950 1451

 

Lukasz supports the wider team across planning, scheduling, and coordination—keeping operations running behind the scenes. His flexibility allows him to step in wherever needed, helping to maintain momentum across projects.

Drawing on experience in warehousing, hospitality, and admin support, Lukasz understands how to manage competing demands while keeping client needs front and centre. His organised, proactive approach ensures nothing is overlooked.

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Kate Baranowska
Accounts & Office Manager

kate@perlawindows.com

 

Kate looks after the company finances and ensures that office and business operations run smoothly. Her responsibilities are wide-ranging and include human resources, compliance and insurance, solving any problems that arise, and ensuring that all Perla projects are progressed efficiently.

A natural multitasker, Kate has the ability to switch from role to role without breaking a sweat. She takes care of all the moving parts to keep the office running like clockwork.

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Sebastian Baranowski
Technical Director

seb@perlawindows.com
+44 0 203 906 1777

 

Perla co-founder and Technical Director, Sebastian, oversees the planning and specification phases of the production process. He also acts as the main point of contact for clients prior to manufacturing and installation.

Sebastian’s extensive knowledge of design and production stems from a life-long interest in manufacturing and engineering. Starting out as a plumber and electrician alongside his father in the family business, Sebastian went on to establish a partnership with Nick and Dan’s building company. Together, they completed more than 100 projects and built a reputation for uncompromising quality.

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Karol Ziolkowski
Project Manager

karol@perlawindows.com
+44 0203 906 1775

 

Karol oversees day-to-day project delivery, ensuring each stage runs smoothly and efficiently. He works closely with both internal teams and clients to keep timelines on track and expectations aligned.

With a BA in Business Management and a background in logistics and operations, Karol brings sharp attention to detail and strong technical knowledge to every project. His process-driven approach helps prevent issues before they arise, creating a more streamlined experience for clients.

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Nick Vassilopoulos
Sales / Marketing and Business Development

nick@perlawindows.com
+44 0 203 906 1776

 

Nick co-founded Perla to provide unparalleled standards for service, value, and quality in the windows industry. Drawing on his past experience in marketing, at technology giant Intel, Nick’s primary focus is on the bigger picture. With astute awareness of market trends and an inherent understanding of customer needs, Nick implements positive change so that Perla can continue to be at the forefront of an ever-evolving market.

Prior to establishing Perla in 2015, good friends Nick and Dan ran a London-based boutique building company focused on high-end renovations and interiors projects.

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Dan Hellin
Sales Director

dan@perlawindows.com
+44 0 203 906 1776

 

Prior to co-founding Perla, Dan spent 10 years as a Partner at the prestigious renovations company he established with Nick in 2005. With a sharp eye for detail and a meticulous approach to planning, Dan’s account management approach draws on more than 25 years’ experience in the building industry.

Having overseen a huge variety of residential and commercial projects, Dan knows how to resolve issues long before they become problems. His broad experience in building processes ensures every project runs on-time, on-budget and according to the business’ ethos of providing incredible service and impeccable quality.

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