{"id":31,"date":"2026-08-04T10:50:25","date_gmt":"2026-08-04T10:50:25","guid":{"rendered":"https:\/\/dampdeck.com\/?guide=new-build-condensation-why-new-homes-get-damp-too"},"modified":"2026-08-04T10:50:25","modified_gmt":"2026-08-04T10:50:25","slug":"new-build-condensation-why-new-homes-get-damp-too","status":"publish","type":"guide","link":"https:\/\/dampdeck.com\/?guide=new-build-condensation-why-new-homes-get-damp-too","title":{"rendered":"New-Build Condensation: Why New Homes Get Damp Too"},"content":{"rendered":"<p>It surprises a lot of new homeowners: a brand-new house can have condensation and even mould in the first year, for a reason that has nothing to do with poor building quality &mdash; the building itself is still drying out.<\/p>\n<h2>Why new homes are wetter than they look<\/h2>\n<p>Wet trades &mdash; plastering, screed floors, brickwork mortar, and concrete &mdash; all contain a significant amount of water when installed, which needs months to fully evaporate out through the surface. A typical new-build can take the best part of a year, sometimes longer for thicker elements like screed, to fully dry out, and until it does, that moisture adds to normal household humidity and increases the risk of condensation, especially in a well-sealed, well-insulated modern home with limited natural draughts to carry it away.<\/p>\n<h2>Signs this is what&#8217;s happening<\/h2>\n<ul>\n<li>The property is less than around 12 months old, or has had significant replastering work done recently.<\/li>\n<li>Condensation and any associated mould appear generally, rather than being concentrated at one clear defect.<\/li>\n<li>It&#8217;s worse in the first winter and gradually improves over subsequent seasons as the building continues to dry.<\/li>\n<\/ul>\n<h2>What to do<\/h2>\n<ul>\n<li>Ventilate more than you might expect to need to, particularly in the first heating season &mdash; new-build ventilation systems (often mechanical extract or MVHR) need to be used consistently, not just when it visibly steams up.<\/li>\n<li>Keep a low, consistent background heat through the drying-out period rather than heating intermittently.<\/li>\n<li>Avoid drying laundry indoors during this period if possible, since the building is already releasing extra moisture of its own.<\/li>\n<\/ul>\n<div class=\"dd-callout dd-callout--warning\">If condensation and mould are severe, localised to one specific spot rather than general, or don&#8217;t improve at all after more than a year, that points to a genuine defect (a ventilation system fault, a cold bridge, or a build quality issue) rather than normal drying-out, and is worth raising with the developer under NHBC or your new-build warranty provider.<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A newly built or newly plastered home can be damp for a specific, temporary reason that has nothing to do with a fault.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"footnotes":""},"dd_pillar":[2],"dd_damp_type":[],"class_list":["post-31","guide","type-guide","status-publish","hentry","dd_pillar-diagnosis"],"_links":{"self":[{"href":"https:\/\/dampdeck.com\/index.php?rest_route=\/wp\/v2\/guide\/31","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dampdeck.com\/index.php?rest_route=\/wp\/v2\/guide"}],"about":[{"href":"https:\/\/dampdeck.com\/index.php?rest_route=\/wp\/v2\/types\/guide"}],"version-history":[{"count":0,"href":"https:\/\/dampdeck.com\/index.php?rest_route=\/wp\/v2\/guide\/31\/revisions"}],"wp:attachment":[{"href":"https:\/\/dampdeck.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31"}],"wp:term":[{"taxonomy":"dd_pillar","embeddable":true,"href":"https:\/\/dampdeck.com\/index.php?rest_route=%2Fwp%2Fv2%2Fdd_pillar&post=31"},{"taxonomy":"dd_damp_type","embeddable":true,"href":"https:\/\/dampdeck.com\/index.php?rest_route=%2Fwp%2Fv2%2Fdd_damp_type&post=31"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}