# Home window renovation and selection guidance > Live situation record from CLSTR: https://clstr.news/situations/home-window-renovation-and-selection-guidance > Updated: 2026-09-08T12:00:00.000Z. Sources: 15. Developments: 4. Home renovation guidance focuses on the technical and aesthetic aspects of window replacement. Initial considerations emphasize the selection of glass types to improve energy efficiency and comfort, such as using double glazing to reduce heat transfer or specialized glass for privacy and noise mitigation. It is noted that homeowners must ensure existing frames can support the weight of modern insulating glass. Subsequent guidance expands to the selection of window frames, highlighting the need to balance architectural aesthetics with functional requirements like ventilation and natural light. Recommendations include harmonizing frame colors with the building facade and adjusting the glass-to-frame ratio to influence both the visual character of the home and the amount of daylight entering specific rooms. Recent technical guidance distinguishes between requirements for new construction and renovations. In new builds, triple glazing is considered the standard, with energy evaluations based on the overall building envelope rather than individual window values. For renovations, the primary objective is reducing heat loss. Modern triple glazing can achieve Uw-values of approximately 0.7 to 0.9 W/m²K, representing a significant improvement over 1980s-era double glazing, which typically ranges from 2.7 to 3.0 W/m²K. Frame material selection is also critical for thermal insulation, measured by the Uf-value. Options include low-cost PVC with low Uf-values, wood which offers natural insulation but requires maintenance, and aluminum or composite materials offering varying levels of durability and performance. In the Netherlands and Belgium, current trends show homeowners increasingly replacing traditional wooden frames with high-quality plastic alternatives to improve thermal insulation, security, and reduce maintenance. To ensure long-term durability, professionals utilize the ‘stelkozijn’ (subframe) method to create stable, airtight connections between the window and the wall, preventing moisture and drafts. Furthermore, experts emphasize that even during rainy weather, short periods of wide-open ventilation—approximately fifteen minutes—are necessary to prevent condensation and mold buildup. ## Claims - Homeowners are increasingly choosing modern materials for windows and doors to improve insulation and reduce energy use. (corroborated by 2 sources) - Using a 'stelkozijn' (subframe) during installation helps prevent drafts and moisture between the wall and the frame. (corroborated by 2 sources) - Plastic window frames offer low maintenance and high thermal insulation compared to traditional wood. (single source) - Veka is a brand known in the industry for robust plastic window profiles. (single source) - Ventilating a home is necessary even during rain to prevent condensation and mold. (single source) - Flemish authorities advise opening windows wide for approximately fifteen minutes to ventilate. (single source) ## Timeline ### 2026-09-08: Home renovation trends focus on insulation and ventilation Homeowners are increasingly adopting plastic window frames for better insulation and low maintenance, while experts emphasize the importance of regular ventilation to prevent mold and moisture. 5 sources. https://clstr.news/cluster/home-renovation-trends-focus-on-insulation-and-ventilation ### 2026-09-03: Homeowners guide to selecting energy-efficient replacement windows Homeowners can improve energy efficiency and reduce costs by selecting appropriate vinyl replacement windows based on insulation performance, U-factors, and specific household needs. 2 sources. https://clstr.news/cluster/homeowners-guide-to-selecting-energy-efficient-replacement-windows ### 2026-08-23: Window selection requirements for new builds and renovations Window selection for new builds focuses on design and total building energy balance, while renovations prioritize thermal insulation through improved glazing and frame materials like wood or PVC. 5 sources. https://clstr.news/cluster/window-frame-selection-for-home-renovation ### 2026-08-19: Window renovation and glass selection for home comfort Homeowners upgrading windows should consider glass type based on insulation needs, safety, privacy, and noise reduction, while ensuring existing frames can support new, thicker glazing. 3 sources. https://clstr.news/cluster/window-renovation-and-glass-selection-for-home-comfort --- Cite as: Home window renovation and selection guidance. CLSTR, https://clstr.news/situations/home-window-renovation-and-selection-guidance