The front windows in our landmarked brownstone were replaced years ago (prior to the creation of the historic district) with windows that don’t match the original configuration. We have a very clear photo from the 1920s showing the original windows, and we’d like to have them replicated. The windows are fairly typical double-hung units, except that the upper sashes originally had over 40 individual lights. We’d like to get true divided lights for the upper sashes (costly, I know), but if we do that, the only way to match the aesthetics of the originals is to us single pane glass. If we use double pane insulated glass, the muntin bars between the panes would have to be almost twice as thick to support the additional weight, and the wood grid would look disproportionately thick compared to the small squares of glass. My question is this: Does the NYC building or energy code require double pane insulated glass, and if so are there landmarks rules that trump the code and permit the installation of new single pane windows designed to match the originals? I can’t seem to find anything helpful online. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"
The front windows in our landmarked brownstone were replaced years ago (prior to the creation of the historic district) with windows that don’t match the original configuration. We have a very clear photo from the 1920s showing the original windows, and we’d like to have them replicated. The windows are fairly typical double-hung units, except…<\/p>\n","protected":false},"author":43188,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"schneps_byline":"","schneps_post_style":"","schneps_post_source":"","schneps_syndicated_read_more":"","schneps_post_source_sitename":"","schneps_syndicated_thumb_html":"","schneps_syndicated_thumb_src":"","schneps_post_source_shortname":"","schneps_post_source_url":"","schneps_post_source_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[55],"tags":[],"districts":[],"class_list":["post-55259","post","type-post","status-publish","format-standard","hentry","category-windows"],"acf":[],"parsely":{"version":"1.1.0","canonical_url":"https:\/\/brownstoner.com\/forum-archive\/2011\/04\/new-single-pane\/","smart_links":{"inbound":0,"outbound":0},"traffic_boost_suggestions_count":0,"meta":{"@context":"https:\/\/schema.org","@type":"NewsArticle","headline":"New Single Pane Windows Permitted in Historic Districts?","url":"http:\/\/www.brownstoner.com\/forum-archive\/2011\/04\/new-single-pane\/","mainEntityOfPage":{"@type":"WebPage","@id":"http:\/\/www.brownstoner.com\/forum-archive\/2011\/04\/new-single-pane\/"},"thumbnailUrl":"","image":{"@type":"ImageObject","url":""},"articleSection":"Windows","author":[{"@type":"Person","name":"LowerUWSider"}],"creator":["LowerUWSider"],"publisher":{"@type":"Organization","name":"Forum Archive","logo":""},"keywords":[],"dateCreated":"2011-04-15T13:53:08Z","datePublished":"2011-04-15T13:53:08Z","dateModified":"2011-04-15T15:44:13Z"},"rendered":"