No other PVCu bi-folding door has been tested to over 127,000 full opening cycles; and with low U-values, PAS:24 and Secured By Design accreditation, the The Signature Collection ModLok™ is in a class of its own – earning the accolade of a Queen’s Award for Enterprise in Innovation in 2017. Ideal for large openings, ModLok™ bi-folds enable you to open up an entire wall of your room.


And The Signature Collection’s ‘top of the range’ ModLok™ bi-fold doors offer even greater strength and rigidity, combining all of the structural benefits of an aluminium door set with the energy efficiency of uPVC, all ‘bottom rolling’, not top-hung.


Whether you have a bedroom with a Juliette balcony, a kitchen-diner, a conservatory or an orangery, The Signature Collection ModLok™ bi-folding doors can provide a stunning alternative to patio or French doors. Available in a wide choice of opening configurations and colours, the The Signature Collection ModLok™ bi-fold has ultraslim sightlines, providing rooms with a clean, modern appearance. Safety features include the innovative low threshold option for family friendly and wheelchair use. What’s more, The Signature Collection bi-fold doors offer high energy efficiency, combined with the best security features on the market – bringing you a modern spacesaving solution for your home that will definitely give it the ‘wow’ factor. Find out about the range of thresholds available from your sales representative.

Standard Colour Options

Rosewood both sides*
Golden Oak both sides*
Anthracite Grey both sides*
Cream foiled both sides*
White foiled both sides*
Ebony Black both sides*
Irish Oak both sides*
Smooth Cream through colour*


Bespoke Colour Options

Rosewood on White*
Golden Oak on White*
Anthracite Grey on White*
Cream foiled on White*
Chartwell Green on White*
Ebony Black on White*
Agate Grey
Silver Grey
Basalt Grey
Dark Green
Dark Red


Colours marked * are from our standard collection in featured profile, all other colours are subject to price and availability on application. Please note: colours are for illustration purposes, for an exact example please ask your sales representative for a Renolit swatch sample. Choose from a wide variety of colour options including: White, Rosewood, Cream, Light Oak, Chartwell Green, Grey and classic Ebony Black. The Signature Collection products are also offered in a wide choice of bespoke colours, please see Renolit foil book, (subject to availability and price on application only). Please note: Ebony Black both sides patios and bi-folds are subject to lead time.

Additional Information

  • 10 Years Profile Warranty
    • Available from an entry level “C” Rated to an “A+”
      Energy rating
    • Your Bi-Fold Plus benefits from being fitted with the most robust locking mechanisms on the market
    • Smooth easy action
    • Full colour range
    • Hook locking with shootbolts
    • Secured by Design Security upgrades available on request
    • Minimum size 600mm w x 1850mm h (sash opening sizes)
    • Maximum size 1000mm w x 2150mm h (sash opening sizes)
    • Slim sight lines (less frame more glass)
    • 8mm sash coverage (best rating for air leakage)
    • Unique patented double action gasket (30% better compression)
    • Centralised Euro groove (improved strength and security)
    • Single J leg security beads (ease of glazing)
    • Anti static profile (easy to clean)
    • 32mm Channel packers factory fitted, resulting in huge efficiencies on site glazing, toe and healing packers fitted in position ensuring safe and quicker glazing
    • All frames are designed to be coupled in many configuration including patio configurations to casement windows
    • Multiple add on’s 10, 20 and 50mm allowing you the perfect choice for every installation
    • Our system has been designed with the future in mind, uniquely negating the need for the traditional steel reinforcing systems, the benefits being an industry leader in energy efficiencies together with a safer future for the environment, a lead free system with unique PVC inserts that have the same tensile strength of reinforcing


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