HST Patio Doors

HST Patio Door

A modern construction product that enables making very large glazed surfaces. The leaves are installed on two independent guide rails and when the door is opened they are positioned behind one another.


Our windows are a combination of excellent performance and pioneering energy efficiency solutions.


Only a negligible percentage of our customers complain about the quality of our windows. Each element of our windows comes with a several years long warranty because we are confident of their high quality.


A window should be a decorative element and should determine the climate of the interior space. We focus on design, aesthetics, and precise production because the little details determine the overall effect.


When you are not at home, you do not need to worry about your property and the security of your family. Our windows are amongst the most secure windows available in the market!


Get Inspired. Check our recent projects featured Oknoplast Windows & Doors.


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Advantages of HST Patio Doors

1. The original, more slender and more elegant
profile highlights the nature of the interior.

2 Unique shape, external angles 4°, 90 degree
glazing bead.

3. As opposed to traditional profiles, larger glass
surfaces ensure lower consumption of energy
required to heat the room, thanks to increased
amounts of heat entering the room through
the pane.

4. Glazing based on the latest production
technology ensure increased amounts
of natural light in the room, which has
a positive impact on your mood.

5. The original reinforcement system allows
the design of fashionable and large glazing,
and also guarantees durability and defect-free
use of the window.

6. A unique glass gasket finishing at an angle
of 45°, a glazing strip in harmony with
the sash curvature and special window
end caps.

7. The capability of using ColorFull technology
that ensures a solid colour and structure on
the entire window surface.

8. The ability to design terrace doors based
on PSK, PSK-Z and PSK Atrium systems

Comfort and functionality PACKAGE

The comfort and functionality package includes accessories and solutions that will tailor our products to your exact needs. With solutions like lowered balcony threshold, sliding window or a special exterior lock on balcony doors, Oknoplast windows will meet the requirements of even the most demanding clients.

The door leaf can be up to 3.0 m wide and the passage can be as much as 2.9 m wide. This solution makes it possible to build glazed surfaces of surface area up to 13.8 m2.


One of the main objectives we set for our products is to provide a sense of security in the house or flat. By choosing safety package solutions, you will improve your doors’ burglary resistance and also reduce the risk of injury with special glazing resistant to breakage

Possibility to use burglary-proof fittings of the RC2 class.

Durability PACKAGE

Our main objective for the durability package was to ensure the maximum stability and durability of the window components. Our clients can choose additional galvanised steel reinforcement, extremely durable gaskets and advanced fittings.

Aesthetics PACKAGE

The window is one of the key elements of an interior and often has decorative purposes. Our solutions will give each window a unique character, i.e. through the very wide colour selection of window frames, colourful gaskets or ornamental glass panels.

Special handles and grips that enable easy sliding of the patio door leaf.

Thermal insulation PACKAGE

Ensuring that the room stays warm is one of the key tasks of the window. In this package, we are offering a special gel-filled thermal spacer that will improve insulation, as well as specially designed sealed glazing units and extremely durable gaskets.

Optional fittings equipped with the trickle ventilation function.


For Oknoplast, compliance with certifications is essential. This guarantees its customers an optimal level of quality for its openings, whether in terms of durability, insulation or respect for the environment throughout the manufacturing process.

Your PVC window company offers certified openings. If it meets legal obligations, it is also a way to ensure their quality. There are French and European standards in this area and Oknoplast has chosen to be certified by the strictest standards.


This certification concerns in particular our PVC Winergetic Premium Passive windows. These windows must be able to be integrated into passive housing and thus meet very strict requirements in terms of thermal insulation.

National Fenestration Rating Council.

The Paris Institute certified our double-glazed windows. This means that the glazing offered by Oknoplast perfectly meets the needs of the French market in terms of comfort and insulation.

For the design, manufacture and sale of PVC windows and other aluminium windows and doors, this standard assures you that Oknoplast has implemented an efficient quality management system.

Like the first certificate mentioned, the Q-Zert certification is awarded by the research institute IFT Rosenheim. It certifies the conformity of the products and cleanliness in the company. This then makes it possible to comply with the European standard EN 14351-1:2006, which itself is necessary to obtain the CE mark certificate.

Finally, this certification was granted to our Winergetic and Winergetic Premium Passive windows. It rewards the high-energy performance of these openings and is delivered by one of the most influential institutes in Europe.