Visofold 1000 Bifolding Doors
Slim sightlines. Excellent thermal performance. Secure, made-to-measure by Marlin.
Contemporary Aluminium Bifold Doors
Visofold 1000 Aluminium Bifold Doors
Open up your home with slim frames, wide openings and a seamless connection to your garden.
The Visofold 1000 aluminium bifold door system is designed to create wide, uninterrupted openings while delivering excellent thermal performance, security and everyday practicality. Ideal for kitchen extensions, garden rooms and full-width rear elevations, its slim aluminium profiles help maximise natural light and create a welcoming transition between indoor and outdoor living spaces.
Design & Performance
Visofold 1000 Key Features
Designed to combine contemporary aesthetics with dependable performance and versatile finishing options.
Optimal Thermal Performance
Energy Rating A, helping to support a comfortable and energy-efficient home.
Attractive Slimline Profiles
Reduced sightlines create a clean, contemporary appearance and help maximise views.
Building Regulations
Designed to meet applicable building regulations when correctly specified and installed.
Dual-Colour Finishes
Choose different internal and external colours to complement your home.
Enhanced Security
PAS 24:2016-approved configurations available, with a domestic-style lift-up handle and adjustable one-piece keep.
Energy ratings, security certification and building regulation compliance depend on the chosen door configuration, glazing and specification.
Why Choose Visofold 1000?
The Visofold 1000 system combines modern aesthetics with reliable performance. Whether you want to flood your home with light or create seamless indoor–outdoor living, this system delivers.
Slim, Modern Sightlines
Reduced frame widths maximise glass area, giving you a clean, contemporary finish with more natural light.
Strong & Secure
High-quality locking systems with PAS 24 options available for enhanced security and peace of mind.
Energy Efficient
Thermally broken aluminium profiles help achieve excellent U-values (configuration dependent), keeping your home comfortable year-round.
Smooth, Effortless Operation
Precision-engineered rollers ensure panels glide open and closed with minimal effort.
Flexible Threshold Options
Choose from low or flush threshold options for improved accessibility and a seamless transition to your patio.
”Would highly recommend Marlin windows. Installed bifold doors with meticulous planning and precision. Had a tour of the workshop and assisted through the purchase and installation process ensuring perfect fit of clearly an excellent aluminium product. Can’t recommend enough! Our builder said they were the best supplier and fitter they had ever used”.
Helen Nellist – Howarth
Visofold 1000 in Detail
Visofold 1000 Bi-fold doors are slide folding doors offering slim sightlines that are ideally suited to residential applications.
All profiles are extruded from 100% recycled aluminium billet and feature extended, chambered polyamide thermal breaks allowing Alitherm to achieve excellent thermal performance.
Product Information
The latest upgrade to the Visofold 1000 bi-fold door features a range of enhancements that deliver significantly improved U-values. The system also features a new track insert (DV100), with the polyamide section simply clipping into the track.
Applications Residential, retail, commercial
System Features
Finish Single or dual colour, marine quality polyester powder coat as standard
Thermal Performance 1.4 W/m²K with a centre pane of 1.2 W/m²K
Air Class 4, 600Pa
Wind Class 4, 1800Pa
Water Class E, 750Pa
Doc L 2010 Yes
Frame Width 102.5mm
Frame Depth 70mm – 82mm
Typical sight line* 133mm
Glass 28mm double or triple gazed units
Max o/a height (per sash) 2500mm
Max o/a width (per sash) 1200mm
Max sash weight 100kg
*Note: the U-values are calculated with foam insulation added to the profiles.
Our Work
Real Visofold 1000 Bifold Door Projects
Explore how our aluminium bifold doors bring light, space and a seamless connection to the outdoors in real homes across the UK.
“The whole journey has been an absolute pleasure, have already recommended your services to many friends“
Configuration Options
Every Visofold 1000 door is made to measure and tailored to your opening.
Panel Configurations
Available in multiple panel combinations to suit both small and large openings.
Opening Styles
- Fold left
- Fold right
- Split opening
- Traffic door option for everyday access
Corner Openings
Create a stunning open corner design (subject to structural requirements).
New Outer Frame Options
With a choice of two new rebated outer frames (DV17 and DV19N), a new integrated cill, and the existing low threshold option, this latest upgrade also includes the introduction of a DV225 heritage style sash to the range, aligning with Smart’s established range of heritage windows and doors.
Optional integrated ventilation.
The Visofold 1000 upgrade also includes optional 70mm UN3570 and 82mm UN3582 hooded trickle vent sections, which provide integrated ventilation.
PAS Approved
As well as improvements to the frames and thermal performance, Visofold 1000’s hardware and accessories range also features a number of significant enhancements, including PAS 24 approval for the door’s standard roller, the addition of new, heavy duty shoot bolt handle and enhancements to the gearboxes.
Many thanks for supplying and installing my new bi-fold doors. The guys did an excellent job today removing my old doors and then installing my new bi-fold doors. They managed to get the old doors and frame out cleanly and then installed the new doors very neatly.
All in all an excellent job well done. The new bi-fold doors look really good!
Premium Security Fitted As Standard With Patented Active Cam Technology
The clever locking system of the Avocet ABS® diamond grade cylinder knows when it has been snap attacked and fires into action to create a robust barrier to entry. The patented Active Cam TechnologyTM is hidden deep within a solid Molybdenum cam which is 20% stronger than steel, and delivers ultimate resistance against a lock snapping attack and snap/twist manipulation. All of the snap technology is focused on the outside part of the lock only. This makes sure that maximum strength is given to the inner part of the lock – the part that has the job of securing your door.
Latest projects
BI FOLD DOORS
The Art Studio, Bifold Doors – Addingham
BI FOLD DOORS
Bifold Doors – Steeton New Build
Helpful guides
Low & Flush Thresholds For Aluminium Bi fold and Sliding Doors
Your detailed guide to getting the fabulous seamless appearance of a flush threshold.
COLOURS AND GLAZING
Our aluminium profiles are polyester powder coated by our systems suppliers using the very latest paint application techniques guaranteed for 25 years.
Fully compliant to the latest June 2022 building regulations our standard double glazing is the exceptional light transmitting, energy saving ClimaGuard® A+ low emissivity (Low-E) glass manufactured by Guardian Glass.
Why choose Marlin?
Reasons why you should expect 100% satisfaction.
Quality Control
We believe that our quality standards are unrivalled. Our manufacturing processes and activities are monitored with well defined controls and inspection procedures are performed by trained personnel.
Care
We respect you, your property and your project taking care over each detail from order to delivery to your post installation satisfaction.
Project Focus
Your project is important to us. We manufacture to your made to measure requirements so that we get it exactly right. See example case studies of our project work.
Ready to transform your home?
Get a made-to-measure quote for your Visofold 1000 bifolding doors today. Our team will guide you through sizes, styles and glazing options to find the perfect fit for your home.
Or call us on 01535 603909 to speak with our team.
Frequently Asked Questions
If you require any support, please don’t hesitate to review our FAQs below or drop us a message on our contact form here
What are Visofold 1000 aluminium bifolding doors?
Visofold 1000 bifolding doors are high-performance aluminium folding doors designed to create wide openings and seamlessly connect indoor and outdoor living spaces. Featuring slim aluminium frames, excellent thermal efficiency and robust security, they are ideal for modern homes, extensions and renovation projects.
How energy-efficient and weather-resistant are Visofold 1000 Bifold doors?
Using polyamide thermal breaks and double‑ or triple‑glazed units (28 mm), it achieves a thermal performance of approximately 1.4 W/m²K, with standard glazing center pane U‑value of 1.2 W/m²K, compliant with UK Building Regulations. It meets air Class 4 (600 Pa), wind Class 4 (1800 Pa), and water Class E (750 Pa) ratings
What are the maximum dimensions, panel options, and sightline specs?
The Visofold 1000 supports sashes up to 1 200 mm wide and 2 500 mm high, with a sash weight limit of 100 kg. The system features slim sight lines—about 133 mm typical, now reduced to 122 mm in the 2025 upgrade
What security and operational features does it offer?
The 2025 upgrade includes PAS 24‑approved rollers and top guides, a robust patented Active Cam locking mechanism, heavy‑duty shoot‑bolt handles, and new magnetic latches to stabilise panels in high winds. It’s also available with low‑threshold options (flush or rebated) for seamless access
Can Visofold 1000 bifolding doors have a flush threshold?
Yes. Visofold 1000 doors offer low-threshold options to create a more accessible transition between indoor and outdoor spaces. Rebated threshold options are also available where enhanced weather resistance is required. READ OUR HELPFUL GUIDE
What colours are available for Visofold 1000 bifolding doors?
Visofold 1000 aluminium bifolding doors are available in an extensive range of RAL colours, including popular contemporary finishes such as anthracite grey, black and white. Dual-colour options allow different finishes internally and externally, helping complement your home’s interior and exterior design.
Can Visofold 1000 bifolding doors open inwards or outwards?
Yes. Visofold 1000 bifolding doors offer flexible opening configurations, including inward and outward folding arrangements. Depending on the layout, panels can fold to the left or right, with split-opening and traffic-door options available for convenient everyday access.
Do Visofold 1000 bifolding doors require much maintenance?
Aluminium bifolding doors are designed to be low maintenance. Regular cleaning of the frames and glass, keeping the tracks clear of debris, and periodic inspection of moving components will help maintain smooth operation and long-term performance. READ OUR HELPFUL GUIDE
Come and explore…
Aluminium Bi-fold Doors, Sliding Doors, Contemporary Glazing, Aluminium Heritage Windows and Traditional Steel Replacement Doors
