{"id":59654,"date":"2024-06-17T10:33:29","date_gmt":"2024-06-17T08:33:29","guid":{"rendered":"https:\/\/filplast.pl\/okna-trzyszybowe-czy-sa-lepsze-od-dwuszybowych-zalety-stolarki-trzyszybowej\/"},"modified":"2025-06-27T14:50:17","modified_gmt":"2025-06-27T12:50:17","slug":"double-or-triple-glazed-windows","status":"publish","type":"post","link":"https:\/\/filplast.pl\/en\/double-or-triple-glazed-windows\/","title":{"rendered":"Triple-glazed windows \u2013 are they better than double-glazing? Advantages of triple-glazed joinery"},"content":{"rendered":"<div id=\"modal-ready\">\n<p class=\"has-text-align-left\" style=\"font-size:16px\"><strong><strong>Triple-glazed windows are becoming the new standard in energy-efficient homes across the UK. But does the third pane of glass really make a noticeable difference to your energy bills? And are double-glazed windows still a viable option in today\u2019s building regulations?<\/strong><\/strong><\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-left\"><strong><strong><strong>Where are triple-glazed windows recommended?<\/strong><\/strong><\/strong><\/h4>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-text-align-left\" style=\"font-size:16px\">Triple glazing is not mandatory under UK law, but it is <strong>strongly recommended<\/strong> in newly built and renovated residential properties aiming for high energy performance.<\/p>\n\n\n\n<p class=\"has-text-align-left\" style=\"font-size:16px\">According to <strong>Approved Document L of UK Building Regulations<\/strong>, the <strong>maximum U-value for windows in new dwellings is 1.2 W\/m\u00b2K<\/strong>. While this can technically be achieved with high-quality double-glazed units, <strong>triple-glazed windows provide much better insulation<\/strong> and help future-proof homes as standards continue to evolve. Triple glazing is also a popular choice for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:16px\">Passivhaus-standard homes<\/li>\n\n\n\n<li style=\"font-size:16px\">Low-carbon or net-zero buildings<\/li>\n\n\n\n<li style=\"font-size:16px\">Cold or exposed regions of the UK<\/li>\n\n\n\n<li style=\"font-size:16px\">Homeowners who want to reduce long-term heating bills<\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-left\"><strong><strong><strong>Why does triple glazing matter? Understanding U-values<\/strong><\/strong><\/strong><\/h4>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-text-align-left\" style=\"font-size:16px\">The thermal transmittance of the glazing unit itself (Ug) significantly affects the overall U-value of the entire window (Uw). Typical values:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:16px\"><strong>Triple-glazed units<\/strong>: Ug = 0.5\u20130.6 W\/m\u00b2K<\/li>\n\n\n\n<li style=\"font-size:16px\"><strong>Double-glazed units<\/strong>: Ug = 1.0\u20131.1 W\/m\u00b2K<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-left\" style=\"font-size:16px\">It is very difficult to meet a full window Uw of 1.2 W\/m\u00b2K with standard double glazing \u2013 especially on larger window units. Triple glazing ensures better thermal performance across all sizes.<\/p>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-left\"><strong><strong><strong>What savings do triple-glazed windows offer?<\/strong><\/strong><\/strong><\/h4>\n\n\n\n<div style=\"height:11px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized is-style-rounded\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/filplast.pl\/wp-content\/uploads\/2022\/07\/CS_76MD-500x500-1.png\" alt=\"Triple-glazed  PVC window\" class=\"wp-image-26084\" style=\"width:443px;height:auto\" srcset=\"https:\/\/filplast.pl\/wp-content\/uploads\/2022\/07\/CS_76MD-500x500-1.png 500w, https:\/\/filplast.pl\/wp-content\/uploads\/2022\/07\/CS_76MD-500x500-1-300x300.png 300w, https:\/\/filplast.pl\/wp-content\/uploads\/2022\/07\/CS_76MD-500x500-1-150x150.png 150w, https:\/\/filplast.pl\/wp-content\/uploads\/2022\/07\/CS_76MD-500x500-1-65x65.png 65w, https:\/\/filplast.pl\/wp-content\/uploads\/2022\/07\/CS_76MD-500x500-1-250x250.png 250w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption class=\"wp-element-caption\">Triple-glazed PVC window<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<p style=\"font-size:16px\">Triple-glazed windows reduce heat loss in winter and help maintain cooler interiors during summer. This results in <strong>lower energy bills<\/strong> and improved comfort throughout the year.<\/p>\n\n\n\n<p style=\"font-size:16px\"><strong><strong>For a 150 m\u00b2 house, the savings can amount to over \u00a3273 during a single heating season!<\/strong><\/strong><\/p>\n<\/div>\n<\/div>\n\n\n\n<p>Let\u2019s take an example:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>House area &#8211; 150 m<sup>2<\/sup><\/li>\n\n\n\n<li>Total window area &#8211; 25 m<sup>2<\/sup>:<br>\u2022 2 single-leaf windows 1100 mm x 1450 mm<br>\u2022 5 double-leaf windows 1700 mm x 1450 mm<br>\u2022 1 single-leaf window 600 mm x 1450 mm<br>\u2022 2 balcony windows 900 mm x 2300 mm<br>\u2022 1 tilt-and-slide door 2000 mm x 2300 mm<\/li>\n\n\n\n<li>Average temperature difference between the interior and exterior during the heating season: 22\u00b0C<\/li>\n\n\n\n<li>Heating season duration \u2013 4800 hours<\/li>\n\n\n\n<li>Price of 1 kWh of energy: \u00a30.28\/kWh<\/li>\n<\/ol>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-2 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong><strong><strong>Size<\/strong><\/strong> (mm)<\/strong><\/td><td><strong><strong>Uw for the glass pane<\/strong><br>Ug=1.1 Wm<sup>2<\/sup>\/K <br><strong>Warm edge spacer<\/strong><\/strong><\/td><td><strong><strong>Uw for the glass pane<\/strong><br>Ug=0.7 Wm<sup>2<\/sup>\/K<br><strong>Warm edge spacer<\/strong><\/strong><\/td><td><strong><strong>Uw for the glass pane<\/strong><br>Ug=0.5 Wm<sup>2<\/sup>\/K<br><strong>Warm edge spacer<\/strong><\/strong><\/td><\/tr><tr><td>1100 x 1450<\/td><td>1.2<\/td><td>0.94<\/td><td>0.81<\/td><\/tr><tr><td>1700 x 1450<\/td><td>1.2<\/td><td>0.97<\/td><td>0.85<\/td><\/tr><tr><td>600 x 1450<\/td><td>1.3<\/td><td>1.0<\/td><td>0.94<\/td><\/tr><tr><td>900 x 2300<\/td><td>1.2<\/td><td>0.94<\/td><td>0.81<\/td><\/tr><tr><td>2000 x 2300<\/td><td>1.2<\/td><td>0.91<\/td><td>0.75<\/td><\/tr><tr><td><strong>Average<\/strong> <strong>Uw<\/strong><\/td><td><strong>1.2<\/strong><\/td><td><strong>0.96<\/strong><\/td><td><strong>0.83<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-left\"><strong><strong><strong><strong>Annual savings calculation<\/strong><\/strong><\/strong><\/strong><\/h4>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-text-align-left\" style=\"font-size:16px\">W = \u2206UW * total window area * average temperature difference * heating season duration<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong><strong>System<\/strong><\/strong><\/td><td><strong><strong>Glass panes package<\/strong><\/strong><\/td><td><strong>\u0394Uw<\/strong><\/td><td><strong><strong>Annual savings for the model house<\/strong><\/strong><\/td><\/tr><tr><td><a href=\"https:\/\/filplast.pl\/en\/product\/pvc-windows-climastar-76\/\"><strong>ClimaStar 76 MD<\/strong><\/a><\/td><td>Ug =0.5 instead of Ug =\u00a0 1.1<\/td><td>1.2-0.83=0.37<\/td><td>(0.37*25*22*4800*\u00a30.28)\/1000 = \u00a3273.19<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-left\"><strong><strong><strong><strong><strong><strong>Double-glazed window units \u2013 where can they still be used?<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h4>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-text-align-left\" style=\"font-size:16px\">Double-glazed windows are still commonly used in areas where thermal performance is less critical, such as garages, basements, or utility spaces. Additionally, double-glazed windows are installed in non-residential buildings subject to lower energy requirements. These include, for example, utility buildings, production halls, warehouses, or temporary structures not intended for long-term use. However, they are <strong>not ideal for heated living spaces<\/strong>, especially if you want to reduce bills or improve comfort.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-left\"><strong><strong><strong><strong><strong><strong><strong><strong>PVC windows \u2013 triple-glazed or double-glazed?<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h4>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-3 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large is-resized is-style-rounded\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/filplast.pl\/wp-content\/uploads\/2024\/06\/Okno-narozne-1024x1024.png\" alt=\"Triple-glazed corner window with wood-effect finish\" class=\"wp-image-50136\" style=\"width:443px\" srcset=\"https:\/\/filplast.pl\/wp-content\/uploads\/2024\/06\/Okno-narozne-1024x1024.png 1024w, https:\/\/filplast.pl\/wp-content\/uploads\/2024\/06\/Okno-narozne-400x400.png 400w, https:\/\/filplast.pl\/wp-content\/uploads\/2024\/06\/Okno-narozne-250x250.png 250w, https:\/\/filplast.pl\/wp-content\/uploads\/2024\/06\/Okno-narozne-768x768.png 768w, https:\/\/filplast.pl\/wp-content\/uploads\/2024\/06\/Okno-narozne-65x65.png 65w, https:\/\/filplast.pl\/wp-content\/uploads\/2024\/06\/Okno-narozne-500x500.png 500w, https:\/\/filplast.pl\/wp-content\/uploads\/2024\/06\/Okno-narozne.png 1080w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Triple-glazed corner window with wood-effect finish<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div style=\"height:98px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p style=\"font-size:16px\">For most homeowners building or upgrading a house today, <strong>triple glazing is the logical long-term investment<\/strong>. The upfront cost difference compared to double glazing is often offset by <strong>energy savings within just a few years<\/strong>.<\/p>\n\n\n\n<p style=\"font-size:16px\">It\u2019s not only about the glazing unit \u2013 modern triple-glazed windows often come with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:16px\">Improved sealing,<\/li>\n\n\n\n<li style=\"font-size:16px\">Warmer edge spacers,<\/li>\n\n\n\n<li style=\"font-size:16px\">Better sound insulation,<\/li>\n\n\n\n<li style=\"font-size:16px\">Enhanced comfort in winter and summer.<\/li>\n<\/ul>\n\n\n\n<p style=\"font-size:16px\"><\/p>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-1 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color has-text-align-center wp-element-button\" href=\"https:\/\/filplast.pl\/en\/contact\/\" style=\"background-color:#01387b\" target=\"_blank\" rel=\"noreferrer noopener\">Contact us!<\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-4 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-contact-form-7-contact-form-selector\">\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f4531-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"4531\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/en\/wp-json\/wp\/v2\/posts\/59654#wpcf7-f4531-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"Contact form\" novalidate=\"novalidate\" data-status=\"init\">\n<div style=\"display: none;\">\n<input type=\"hidden\" name=\"_wpcf7\" value=\"4531\" \/>\n<input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.0.5\" \/>\n<input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/>\n<input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f4531-o1\" \/>\n<input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/>\n<input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/>\n<input type=\"hidden\" name=\"_wpcf7cf_hidden_group_fields\" value=\"[]\" \/>\n<input type=\"hidden\" name=\"_wpcf7cf_hidden_groups\" value=\"[]\" \/>\n<input type=\"hidden\" name=\"_wpcf7cf_visible_groups\" value=\"[]\" \/>\n<input type=\"hidden\" name=\"_wpcf7cf_repeaters\" value=\"[]\" \/>\n<input type=\"hidden\" name=\"_wpcf7cf_steps\" value=\"{}\" \/>\n<input type=\"hidden\" name=\"_wpcf7cf_options\" value=\"{&quot;form_id&quot;:4531,&quot;conditions&quot;:[],&quot;settings&quot;:{&quot;animation&quot;:&quot;yes&quot;,&quot;animation_intime&quot;:200,&quot;animation_outtime&quot;:200,&quot;conditions_ui&quot;:&quot;normal&quot;,&quot;notice_dismissed&quot;:false,&quot;notice_dismissed_rollback-cf7-5.3.2&quot;:true,&quot;notice_dismissed_update-cf7-5.5.2&quot;:true,&quot;notice_dismissed_update-cf7-5.8.7&quot;:true,&quot;notice_dismissed_rollback-cf7-5.8.7&quot;:true}}\" \/>\n<input type=\"hidden\" name=\"_wpcf7dtx_version\" value=\"5.0.3\" \/>\n<\/div>\n<p><span id=\"wpcf7-69d2954463d5b-wrapper\" class=\"wpcf7-form-control-wrap honeypot-591-wrap\" style=\"display:none !important; 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Discover the key facts and make an informed decision.<\/p>\n","protected":false},"author":7,"featured_media":50130,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[176],"tags":[816,273,807,817,818,819,822],"class_list":["post-59654","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guide","tag-aluminium-en","tag-ennergooczedne-okna-en","tag-okna-en","tag-okna-aluminiowe-en","tag-okna-pcv-en","tag-pvc-en","tag-szyby-okienne-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Double vs triple glazing \u2013 why triple glazed windows are worth it<\/title>\n<meta name=\"description\" content=\"Triple vs double glazing \u2013 which is better? 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