Perla Windows

G-Series Steel Doors

Energy efficiency, refined detailing

Slim sightlines, exacting performance

The Perla G-Series is a collection of steel door systems engineered for projects that demand precision, performance and design integrity. G1, G2 and G3 share a consistent aesthetic while differing in profile depth, thermal performance and scale. Available as side-hung or pivot doors in single or double leaves, with heights up to 3.0 m, each system can be specified in glazing, ironmongery and finish to suit the design intent.

Architectural flexibility

Slim profiles and consistent sightlines give the G-Series its architectural reach. Specify side-hung or pivot openings, single or double leaves, and heights up to 3.0 m. The result is clear, confident geometry that supports compositions ranging from refined minimal grids to expressive large-scale rhythms — all with measured proportion and control.

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Tailored design & finish

We understand that design integrity lies in the detail. Each system supports a wide choice of glazing types, SDL / TDL glazing bars, bead profiles and ironmongery. Finishes range from natural steel character to the full RAL and metallic spectrum, allowing the material to complement or contrast with surrounding architecture.

Performance, matched to need

Performance scales across the range. G1 delivers B-Rated efficiency with the clarity of hot-rolled steel. G2 introduces thermally broken construction for a U-value of 1.4 W/m²K. G3 advances to 1.0 W/m²K with greater height capability. Across all systems, robust engineering, acoustic control and certified weather performance ensure comfort, compliance and longevity.

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Explore the range

G1
B-rated energy-efficient steel doors

  • B-Rated
    Certified to meet BS EN ISO 10077-2:2017

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

  • RAL finishes
    Powder-coated finishes in any RAL colour

  • Thermal transmittance
    Designed to keep heat in and cold out

Explore G1

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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