Liniar Patio Doors

Enhance your home with our revolutionary uPVC patio doors, offering low profile thresholds to cater for the needs of today’s homeowner.

Bi Fold Doors

Gain panoramic views of the outside and increased natural light inside with our beautifully designed, market leading uPVC & aluminium Bi-fold doors from Coldseal.

Key Details

  • Bi Fold Doors

    What makes bi-fold doors perfect for your home?
    In summer, they make the most of the sunlight and fresh air as they open fully to remove the barrier between your outdoor and indoor living space.
    While, in winter, they become a thermally-efficient barrier to the elements keeping you and your family snug and warm inside.

  • Hand Finished uPVC Doors

    A skilled operative completes a
    stringent hand finishing process on all our Liniar doors. Therefore we only supply
    our customers with Liniar doors of the highest quality.

  • Versatility & Choice

    By using a standard 28mm or 36mm
    unit, we can supply our complete range of Residential Liniar doors unglazed allowing
    you to independently source the glass or panels. We can also make door and side
    screen combinations within a single outer frame.

  • Environmentally Friendly

    Liniar profile is 100% lead free and
    100% recyclable. This means that our full range of Liniar uPVC doors meets
    legislation in advance.

  • Exclusive Astragal Bar Options

    Our entire selection of uPVC
    Residential doors are available with the exclusive ColdSeal 20mm astragal bar option
    in the complete range of colours.

  • Superior Gaskets

    Liniar doors use patented double
    action bubble gaskets, which provide enhanced levels of weather tightness and

  • Yale Maximum Security Locking Systems

    As a Yale approved fabricator our
    Residential, French and Patio doors come with Yale high security locking systems as
    standard. This includes Yale's ModLok™ on our Patio Plus range and Lockmaster
    multipoint locks on French and Residential doors.

  • 10 Year Guarantees

    All of our uPVC Liniar door frames
    come with a 10 year manufacturer’s guarantee from Liniar against cracking, warping
    and discolouration.

  • Slim Sight Lines

    Slimmer frames mean less uPVC, more
    glass and more natural light.

  • No Keeps Necessary

    Shootbolt locks ensure the doors are
    bolted firmly into the stainless steel track, maximising security and removing the
    need for keeps.

  • Concealed Hardware

    In-board mounted stainless steel
    track conceals hardware so only the hinge knuckles are visible when the door is

Features & Benefits

Our Coldseal Bi-fold doors have been designed from the ground-up to be truly market leading. They are the first product of their kind to be regarded as a genuine alternative to the long-standing aluminium systems.

Additional security for the home

The security of your home is of paramount importance to us and this is why we offer some of the most secure locking systems for the entrance to your home. That’s why we partner with both Yale and Winkhaus for our entrance doors.

Window and door colours

Colour Options

The right colour to suit your home. Choose from traditional white PVCu to striking Anteak Teak to make a home look stylish, modern and chic.

Colours available

Agate Grey
Anthracite Woodgrain
Antique Teak
Basalt Grey
Black Woodgrain
Chartwell Green
Agate Grey
Anthracite Woodgrain
Antique Teak
Basalt Grey
Black Woodgrain
Chartwell Green
Window and door glass supplier


Sometimes you need to protect your privacy, which is why we offer a range of obscure glass.

Glass styles available

uPVC Window handles

Hardware choice doors

Our hardware has been selected to perfectly complement our doors and with partners such as Yale and Mila, we can provide the perfect combination.

Our range

Designed to meet the high standards and security that homeowners have come to expect for their home

Be inspired

Our window and door products can bring any house to life, from our
innovative Refine sash with no welds to our range of high-quality composite entrance doors. We aim to
inspire any homeowner to find the product to suit their needs.


Book a free home survey

If you like the look of our products & want to take the next step in transforming your home? A good place to start is to book free home survey

Schedule Now

Low Energy Glazing Options

Glass used in double glazing window for thermal insulation is known as Low E, or low-emissivity glass. It has a transparent metallic coating that works in two ways to economise heating energy.