B2 Bifold Doors

Perla Windows

Designed for performance, built for scale.


The B2 aluminium bifold door system represents the largest and most advanced model in the B-Series range. With vent heights up to 3.5 m, 90 mm sightlines and U-values from 0.8 W/m²K, it delivers exceptional scale and thermal performance in perfect balance. Configurable for 90° corner openings and multiple thresholds, B2 allows entire façades to fold away with fluid precision. Refined engineering, durable construction and a full spectrum of finishes ensure lasting strength and architectural clarity in every detail.

B2 features

  • uValue from 0.8 W/m2K
    Highly energy efficient aluminium profiles

  • Up to 3.5m vent height
    Large scale glazing with super-slim sightlines

  • Range of finishes
    RAL Classic and metallic colours

  • Sound insulation
    Cancels out exterior noise up to 47db

  • Thermal barrier
    Composite thermal insulation system

  • Burglary resistance
    Security tested to RC 2/PAS 24

  • Wind resistance
    Certified B4 Class to meet EN 12210

  • Air permeability
    Certified Class 4 to meet EN 12207

  • Water tightness
    Certified Class 9A to meet EN 12208

System overview

Design & Construction

Minimalist design meets exceptional engineering

  1. Slim sightlines: Frame and sash at just 90 mm
  2. Durable profiles: Strong 2.3 mm thickness
  3. Polyamide strip insulation: Frame 20 mm, leaf 30 mm
  4. Versatile glazing: Supports 25–65 mm thickness
  5. Flexible opening options: Inward or outward, up to 14 sashes
  6. Seamless corner design: 90° corner sash without a mullion
  7. Three threshold options: 4 mm, 15 mm, and 71 mm for minimal trip hazards, easy access, and maximum weather tightness.
Perla Windows

Minimal sightlines

With a construction depth of 90 mm, the face width of the leaf and frame profile is just 41 mm, adding up to 90 mm in the face plate.

  • 90 mm

    profile depth

  • 90 mm

    face plate

Maximum dimensions

Element sizes of up to 1500 mm width x 3500 mm height per leaf (max. 150 kg leaf weight)

  • 150 cm

    leaf width

  • 350 cm

    leaf height

  • 150 kg

    leaf weight

Design options

Finishes

  • IGP Classic
    Comet

  • IGP Classic
    Triton

  • IGP Classic
    Moon Dust

  • IGP Classic
    Eruption

  • IGP Classic
    Shooting Star

  • IGP Classic
    Galaxy

  • IGP Classic
    Meteorite

  • IGP Classic
    Gravity

  • IGP Dura
    Classic 32

  • IGP Dura
    Classic 33

  • IGP Dura
    Aged Bronze

  • IGP Dura
    Smooth Carriage

  • IGP Dura
    Medium Bronze

  • IGP Dura
    Scorpion Shell

  • IGP Dura
    Walnut Wood

  • IGP Dura
    Classic 34

  • RAL Classic
    300+ Colours

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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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