It should be carried out on the basis of technical documentation containing:

• construction project prepared in accordance with the regulation on the detailed scope and form of the construction project (Regulation of the Minister of Transport, Construction and Maritime Economy, Journal of Laws. 2012, item 462 as amended),
• technical specification for execution and acceptance of assembly works.

It should include:

• determination of the type of windows and balcony doors and the method of their installation
• the method of preparing the reveals
• description of the installation of the window with the method of sealing the junction of the frame with the jamb
• requirements to be met by materials for installation, insulation and sealing, including mechanical fasteners,
• technological descriptions of the execution of the various stages of the installation with a clear indication of the contractor and responsible for their execution,
• conditions for proceeding with the assembly, including a list of tests or measurements necessary to be performed before and after the assembly,
• specifications and requirements for materials for assembly, insulation and sealing (adhesives, surface priming materials, finishing materials, mechanical fasteners, etc.),
• a list of documents confirming the quality of the materials used required for acceptance,
• schedule of works.

Proposals for changes should be agreed with the designer and obtain his approval and that of the developer.
The agreed corrections and changes must be entered in the construction log and - in accordance with the requirements of the Construction Law - must be applied to the project in an unambiguous manner. The design with the applied changes constitutes the as-built documentation.

It is important in the technical evaluation of the correctness of the installation, should be systematically noted in the construction log. The records should show

• the order and manner of execution of the various stages of work,
• the conditions of their execution,
• the dates of acceptance into stock of materials for assembly, and confirmation of verification of the method of labeling of delivered materials/products, along with an assessment of the correctness of accompanying documents, such as declarations of performance, declarations of conformity, certificates, technical sheets, operating instructions.

Testifying to the approval of products and materials for installation, insulation and sealing of windows.Documentation should include:

• certificates (if such are the requirements of the investor),
• declarations of performance characteristics (of construction products covered by harmonized standards)
• EC / EU declarations of conformity (of products to which the Technical Approvals apply)
• national declaration of conformity (document currently not mandatory)
• national declaration of performance (mark "B" for AT or KOT),
• technical sheets (when applicable).

For each of the products and materials used, the contractor should have information from the manufacturers of the products and materials about the shelf life.

If the investor's contract with the contractor is not accompanied by technical specifications, the type of windows to be installed, the method of installation and the conditions for acceptance should be specified in the description in the documentation, for example, with a reference to:

• guide "Windows and exterior doors. Requirements, classification and scope of application", ITB guidelines 480/2012
• Technical conditions for the execution and acceptance of construction works, part B: finishing works, Book 6: "Installation of windows and balcony doors", guidelines ITB 2016,
• "Guidelines for the installation of windows and exterior doors in new and renovated buildings," IFT Guidelines 2018,
• "Standard for sealing and insulating junctions between frames and jambs," Selena FM 2020 guidelines.

The thermal insulation of the window (heat transfer coefficient) up to the point of contact with the masonry (junction of the jamb with the frame) according to the Technical Conditions from December 31, 2020 should be 0.9 W/m2K.

The connection should be insulated so that it is also an acoustic barrier. In order to achieve a reduction in the penetration of airborne sounds into the building from the environment through the use of partitions with adequate sound insulation, with reasonable consideration of all its parts and components, such as window frames and air vents, regardless of the result of calculations in the acoustic design, the sound insulation of the building envelope should not be less than R'A,2 = 30 dB. This requirement does not apply to the partitions of lobbies and reception rooms in hotels, corridors and recreation rooms in schools, consumption halls of cafes and restaurants, exhibition halls and rooms for sports activities and other rooms with similar purposes, for which the evaluation index R'A,2 = 25 dB should be taken as the minimum insulating capacity

In the 2008 revision of the Technical Conditions, for the first time in Poland, recommendations were given for the airtightness of a building. According to them, the exchange rate at a standard test with a pressure difference of 50 Pa should not exceed the value of 1.5 [1/h] for buildings with mechanical ventilation and 3.0 [1/h] for gravity ventilation. In passive buildings, on the other hand, air exchange under the same conditions should not be more than 0.6 [1/h]. Such high airtightness already requires the use of special solutions and sealing materials, and must be subject to control tests of the airtightness of the enclosure in the finishing phase of the building.

According to the requirements of the "Technical conditions to be met by buildings and their location" for residential buildings, the minimum value of dimensionless temperature fRsi should be 0.72.