S4 Sliding Doors

Perla Windows

The best in minimal-frame engineering

The S4 Slimline Aluminium Sliding Door system is designed for architecture that demands scale without compromise. Panels up to 4.0 m x 4.0 m and interlocks as narrow as 25 mm create seamless expanses of glass with up to 94% glazed surface area. Thermally broken profiles achieve U-values from 0.9 W/m²K, pairing large-scale transparency with exceptional efficiency. Tested for acoustic, security and weather performance, S4 represents the highest standard in sliding design — a system that merges precision engineering with architectural ambition.

S4 features

  • uValue from 0.9 W/m2K
    Most energy efficient sliding door system available

  • Up to 4m sash height
    Largest slimline sliding door system on the market

  • Range of finishes
    RAL Classic and metallic colours

  • Sound insulation
    Cancels out exterior noise up to 43db

  • Thermal barrier
    Heat-resistant reinforced insulating bars

  • Burglary resistance
    Security tested

  • Wind resistance
    Certified C3/C4 Class to meet EN 12210

  • Air permeability
    Certified 4 Class to meet EN 12207

  • Water tightness
    Certified 7A / 9A Class to meet EN 12208

Perla Windows
Perla Windows
Perla Windows

System overview

Design & Construction

Minimalist design meets exceptional engineering

  1. 2 mm thick aluminium profiles – high precision production lines
  2. Flush threshold with hidden rail option
  3. Smooth sliding movement provided by rollers positioned in the frame
  4. Option to conceal sliding sashes into wall pockets
  5. 90° corner configuration available
  6. 1-6 sliding sashes and up to three rails
  7. Exceptional thermal and acoustic values
  8. Profile depth compatible with insulating glass up to 54 mm
Perla Windows

Minimal frame & sightlines

With a construction depth of 44 mm, the face width of the leaf and frame is just 55 mm, adding up to 44 mm in the face plate

  • 180 mm

    frame depth

  • 25 mm

    sightline

Maximum dimensions

Sizes of up to 4000 mm width x 4000 mm height per sash

  • 400 cm

    sash width

  • 400 cm

    sash height

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

S4 projects

Perla Windows

Ellerby Street

S4W40FD30s
Perla Windows

Staverton

S4W20
Perla Windows

Copperkins

S4W20FD30

Get an estimate

Starting a project is quick and easy. Simply tell us about your project and share drawings and we'll reply within 24hrs

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Download brochures

Visit our client resources section to view and download the most up-to-date range of Perla product brochures

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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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