Ultra-Slim 36mm Sightlines. Confident Security.
The Origin OB-36+ Bi-Fold Door features an ultra-slim 36 mm sightline to maximise glass and natural light. Panels fold and stack neatly to create wide, open access, with an optional everyday traffic door for quick in-and-out use. Precision-engineered in the UK, the OB-36+ combines free-glide running gear, thermally insulated aluminium, and advanced weather seals for smooth, quiet operation all year round. Security includes an 8-point locking system with high-security cylinder options (up to 3-Star Diamond), and PAS 24 compliance with Secured by Design available on selected specifications. U-values from 0.78 W/m²K with appropriate glazing and configuration.
*Actual performance depends on glazing, sizes, configuration and installation.
Compare the differences between the collections.
The key differences between the bi-fold collections are the sightlines they achieve. The table below shows the performance and differences between them.
| OB-36+ | OB-49 | OB-72 | |
|---|---|---|---|
| Sightline | 36mm | 49mm | 72mm |
| U-Value | Up to 0.78W/m²K | Up to 1.1W/m²K | Up to 1.1W/m²K |
| Secured By Design | Awaiting certification | ✓ | ✓ |
| Guarantee | Up to 10 years Marine Environment: Up to 10-years (frame); up to 5-years (hardware) | ||
British Engineering Excellence
Designed and manufactured in the UK by Origin, ensuring exceptional quality and supporting British craftsmanship.
Premium-Grade
Aluminium
Thermally insulated aluminium with a durable powder-coated finish for long-lasting weather resistance and low maintenance—just routine cleaning with mild soapy water.
Advanced Thermal Performance
U-values as low as 1.1 W/m²K with triple glazing. Polyamide thermal breaks and comprehensive weather seals help keep homes warm in winter and cool in summer. Actual results depend on glazing and configuration.
Free-Glide
Hardware
Bottom-rolling carriages with precision bearings and a guided top track deliver a quiet, effortless fold-and-slide action day after day.
Ultra-Secure
Locking
Robust 8-point locking with high-security cylinders; 3-Star Diamond cylinder upgrade available. PAS 24 and Secured by Design options for enhanced protection.
High-Performance
Glass
Toughened safety glass as standard, with options for laminated and acoustic glazing, low-e coatings, warm-edge spacers, argon fill, and triple-glazed units. Integral blinds available.
Completely
Bespoke
Every OB-36 is made to measure: choose from 150+ RAL colours (dual-colour available) and woodgrain finishes, multiple handle styles (standard aluminium lever or stainless upgrade), weathered or non-weathered thresholds, traffic-door options, and 1–12 leaf configurations—including corner sets.
Origin bifold doors are offered in two truly beautiful collections
Regardless of your chosen Collection, all our Doors are handcrafted with meticulous attention to detail. Both Collections redefine the standards of elegance, making a bold statement in any architectural setting.
Soho
Origin’s all-new Soho Collection epitomises the pinnacle of luxury and style. The sought after steel-look, seamlessly merges cutting-edge design and ultra-slim sightlines with unparalleled functionality.
Contemporary
Reviving the passion that originally drove people to love bifolds, and featuring large panes of glass and slim sightlines, the Contemporary Collection is a suite that offers the perfect combination of refined engineering and expert manufacturing.
OB-36+ Bi-Fold Door Specifications (Contemporary vs Soho)
Spec | OB-36+ Contemporary | OB-36+ Soho |
|---|---|---|
Construction | Premium-grade, thermally broken aluminium | Premium-grade, thermally broken aluminium |
Manufacture Origin | United Kingdom | United Kingdom |
Insulation | U-values as low as 0.78 W/m²K with the right glass/spec | U-values as low as 0.78 W/m²K with the right glass/spec |
Glazing | Double or triple glazing (spec-dependent) | Double or triple glazing (spec-dependent) |
Colours & Finishes | 150+ RAL colours, textured & dual-colour available | 150+ RAL colours, textured & dual-colour available |
Handle / Hardware | Curated Contemporary range incl. Signature Knurled and All-in-One offset sets | Steel-style aesthetic with Signature Knurled sets and matching offsets/inline options |
Panel Configurations | Single, French, Bi-Fold, Corner | Single, French, Bi-Fold |
Threshold Options | Weathered, non-weathered and low/mobility options | Weathered, non-weathered and low/mobility options |
Sightline | 36 mm slimline profile | 36 mm slimline profile |
Operation Type | Free-glide folding action with precision running gear | Free-glide folding action with precision running gear |
Security | PAS 24 compliant; Secured by Design achievable on some options | PAS 24 compliant |
Warranty | Origin industry-leading guarantee (terms apply) | Origin industry-leading guarantee (terms apply) |
* Performance depends on glazing, sizes, configuration and installation. For project-specific guidance, we’ll tailor the specification.
Colour Options
Hipca White 9910G
Jet Black 9005M
Dark Silver 9007M
Anthracite Grey 7016M
Black Grey 7021M
Slate Grey 7015M
Handle Options & Hardware
Choose from premium hardware designed to complement the ultra-slim OB-72 bi-fold system.
Stainless / Collection-Matched Lever (Traffic Door)
Ergonomic lever on the everyday access door with integrated multi-point locking and high-security cylinder options (up to 3-Star Diamond). Finishes coordinated to the Contemporary or Soho collection, with stainless and colour-matched options.
D-Handle (Folding Leaves)
Robust pull handle on the folding leaves for easy opening and neat stacking. Available in stainless steel or RAL colour-matched finishes to suit both collections.
Slave Handle & Shoot Bolts
Low-profile slave handle operates the concealed top and bottom shoot bolts on intermediate leaves—quick to use and securely locks the set.
Free-Glide Running Gear
Bottom-rolling carriages with precision bearings and a guided top track deliver a smooth, quiet fold-and-slide action, built for long-term reliability.
Key Features & Benefits
The Origin OB-36+ pairs classic 36 mm sightlines with a smooth free-glide folding action. Precision-engineered in the UK, it delivers wide views, dependable operation and a more traditional frame aesthetic to suit modern or period homes.
Ultra-Slim 36mm Mullion
Refined 36 mm sightlines increase glass area for brighter, more open interiors while keeping a crisp, design-led look.
Free-Glide Operation
Bottom-rolling carriages with precision bearings and a guided top track provide a quiet, effortless fold-and-slide—day after day.
Advanced Thermal Efficiency
Thermally insulated aluminium with polyamide thermal breaks and comprehensive weather seals helps keep heat in during winter and out in summer. U-values from 0.78 W/m²K with appropriate glazing and configuration.
Durable Powder-Coated Finish
High-grade powder coating creates a tough, smooth surface that resists weathering and colour fade. Choose from 150+ RAL colours, with textured and dual-colour options.
High-Security Locking
Robust 8-point locking with high-security cylinders; 3-Star Diamond cylinder upgrade available. PAS 24 compliant, with Secured by Design available on selected specifications.
British Manufacturing
Designed, engineered, manufactured and supported in the UK for consistent quality and dependable lead times.
Why Choose Origin OB-36+ Over Other Systems?
The OB-36+ combines ultra-slim 36 mm sightlines with a smooth free-glide folding action—offering practical advantages over sliding, French and traditional patio doors.
Wider Openings Than Sliding Doors
Bi-fold leaves stack to the side to create a near full-width opening for effortless indoor–outdoor living—something sliders can’t match on like-for-like widths.*
Everyday Access With a Traffic Door
Many OB-36+ layouts include a hinged traffic door for quick in-and-out use without folding the whole set—ideal for daily life.
Engineered Aluminium Advantage
Slim, strong aluminium profiles with polyamide thermal breaks for energy efficiency and low maintenance. PAS 24 compliant with 8-point locking; upgrade to a 3-Star Diamond cylinder. U-values from 0.78 W/m²K with the right glazing and configuration.
More Versatile Than French Doors
Cover wider spans with multiple panels, choose centre-opening (bi-parting) sets, and pick thresholds to suit the setting—all while keeping the refined 36 mm look in Contemporary or Soho styling.
*Clear opening varies by configuration and threshold choice.
Introducing the all-new OS-29+
Experience the next generation of slimline design with the OS-29+.
Featuring enhanced thermal efficiency, flush stacking and refined aesthetics, the OS-29+ delivers in both style and performance for the long-term.
Speak to us about this range!
Our work
