About ClearWindow
ClearWindow is an independent information resource focused on architectural glazing and window energy performance in Poland. The content here covers technical specifications, material comparisons, and regulatory standards that shape how windows are designed and evaluated in Polish construction practice.
The site draws on publicly available standards from the Polish Committee for Standardization (PKN), European norms such as EN ISO 10077, and published research on building envelope performance. Where relevant, links point to source documents or authoritative organisations including the European Commission's energy efficiency documentation and the Polish Institute of Building Technology (ITB).
What this resource covers
Content is organised around three practical areas:
- Glazing system construction — how double and triple insulating glass units are built, what gases fill the cavities, and how spacer bars affect thermal performance
- Frame materials — the thermal, acoustic, and maintenance characteristics of PVC, aluminium, timber, and composite profiles
- U-value ratings and insulation standards — what the numbers mean, how they are measured, and where Polish building regulations set mandatory thresholds
Scope and limitations
This is a reference resource, not a directory or procurement channel. No products are sold here and no contractors are recommended. The information describes general technical principles; specific projects should always be evaluated by a licensed constructor or certified energy auditor familiar with local conditions.
Regulatory values cited on this site reflect the requirements in force under the Polish Minister of Infrastructure and Development's technical conditions (Rozporządzenie w sprawie warunków technicznych), which were last substantially updated in 2021. Requirements change over time; always verify current thresholds with the relevant authority before submitting a building permit application.
Contact
ClearWindow Sp. z o.o.
ul. Marszałkowska 84/92
00-514 Warsaw, Poland
NIP: 5213001894 | REGON: 012605986
Phone: +48 22 345 67 89
Email: info@clearwindow.eu
Last updated: May 2026