Tradition of Quality since 1969.

Bertrand is a renowned manufacturer of windows, doors and curtain walls. The company was founded in 1969 and we have quenched the dreams of our numerous customers not only in Poland but in Europe, USA and worldwide.


Our extensive range of products is characterized by an exceptional quality. We use manufacturing procedures based on modern technology and apply a wide range of materials: different types of wood, a variety of PVC and aluminium profile systems as well as combined materials, such as wood-aluminium or PVC-aluminium.


We provide a comprehensive service in every respect. Product details are made by experienced employees, e.g. surface grinding in wooden windows. Share your dreams with us and we’ll make them come true. Your dream project is somewhat extraordinary? Great! Taking on challenges is what we do.


Bertrand is part of the NFRC Product Certification Program. We have done certification for NFRC and AWS ratings for our chosen product lines from NCTL. Bertrand window and door has done certfication for European style windows, doors, sliding windows , lift and slide doors from materials such as wood – aluminum, aluminum and uPVC.  In our commitment to quality, Bertrand is also part of the Keystone Fenestration Certification Program which ensures that our windows are manufactured to the highest of standards by means of strict quality control.

BERTRAND – the highest quality products.

The highest quality of our products is achieved by the use of the most up-to-date technologies and continuous investments into R&D. Being one of the few manufacturers in Poland to have successfully introduced modern solutions into the market making us a pioneer of innovation and development within this sector.


Example of such products are heating windows, Synergic and uPVC system Kubus. The quality, safety and comfort of our products are confirmed by numerous prestigious awards and certificates. Safety of our product is confirmed by German police.

The unique You choose.

You can choose from a wide range of materials: PVC systems, variety of timbers ranging from traditional pine to exotic species from around the world, aluminium systems as well as composite systems of PVC-aluminium and timber-aluminium. To complement our range of windows and doors you can choose from a vast spectrum of accessories e.g. roller- shutters, venetian blinds, insect screens, shutters, garage doors or even marquises or full glass constructions. We also offer numerous modern control systems e.g. radio, internet or biometrics. In result of it will be easily able to fulfill the container.



Members of Board




How to place an order from Bertrand Windows & Doors?

Send e-mail to address
Include important information in your e-mail such as: project location, type of product, equipment, glass and glazing requirements, etc. Inform us about obligatory certification dedicated to North American markets and essential parameters for Your windows and doors. You will receive answer in max. 2 working days.
Detailed information and dimensions
Send windows and doors schedule or Excel sheet, in which we can find construction dimensions and side of the opening. In this way we are able to prepare for You a proposal much faster, than with only architect plans without any windows and doors schedule. You can also simply send us picture of design You are looking for window, door, handle, handrail or any other product.
Response and preparation of the offer with quotation
We will prepare an offer in 1-2 working days. Please, check carefully dimensions and sides of the opening. Offer is accepted when we receive signed PDF with our offer.
Accepting offer and sending invoice
In next step we are sending invoice with 50% payment in advance to start the production.
Your offer is fowarded to the production hall and your products are getting prepared.
Packing and shipping
Finished products are packed and prepared to shipment. Second payment takes time before container is leaving the factory.




What are the differences between American and European windows?



American windows:


European windows:



1. Design and operation

  • Double-Hung Windows: The most common type, featuring two sashes that slide vertically past each other.
  • Single-Hung Windows: Similar to double-hung, but only the bottom sash moves.
  • Casement Windows: Hinged at the side, these windows open outward with a crank.
  • Sliding Windows: Move horizontally along a track.
  • Picture Windows: Large, fixed panes of glass that do not open.
  • Tilt and Turn Windows: Versatile windows that can tilt inward from the top for ventilation or swing fully open inward from the side for cleaning or maximum air flow.
  • Turn-Only Windows: Hinged to open inward like a door.
  • Tilt-Only Windows: Tilt inward from the top, usually for ventilation.
  • Fixed Windows: Non-operable, large panes of glass.
  • Tilt and Slide Windows/Doors: Slide horizontally like American sliding windows but also tilt for ventilation.

2. Materials, construction and energy efficiency

  • Often made from wood, vinyl, or aluminum.
  • Insulation is usually provided by double-pane (insulated glass units) with air or argon gas in between.
  • Energy efficiency varies, but many modern American windows are designed to meet local energy codes.
  • Often have Low-E (low emissivity) coatings to improve thermal performance.
  • Typically constructed using materials such as uPVC, aluminum, and wood.
  • Often have triple glazing for superior insulation, using argon or krypton gas between panes.
  • Employ more robust construction techniques to enhance durability and insulation.
  • Generally held to higher energy efficiency standards, partly due to stricter regulations.
  • Commonly use triple glazing and advanced sealing techniques to prevent air leakage.
  • U-values (measure of thermal transmittance) are typically lower, indicating better insulation.

3. Security, installation and maintenance

  • Designed with various forms of screens to keep insects out while allowing ventilation.
  • Security varies but can include locks and latches.
  • Installation techniques can vary widely, often designed to fit into a range of building styles.
  • Maintenance involves regular cleaning, occasional painting or sealing, and sometimes replacing parts like cranks or seals.
  • Ventilation is highly prioritized with tilt and turn mechanisms allowing secure ventilation.
  • Advanced locking mechanisms and multi-point locks are common, enhancing security.
  • Installation is usually more precise, fitting snugly into the window opening with less tolerance for gaps.
  • Maintenance is minimal due to high-quality materials and construction; typically involves cleaning and occasional lubrication of moving parts.

4. Aesthetic Preferences

  • Often designed to complement traditional or contemporary American architectural styles.
  • Can include decorative elements like grids (mullions) within the glass for a classic look.
  • Sleek, modern design often favored, with large glass areas and minimalistic frames.
  • Designed to maximize light and provide unobstructed views.

The differences between American and European windows are quite pronounced, stemming from variations in design preferences, building codes, climate considerations, and technological innovations.