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It sets general principles for matching the original house’s scale, materials, roof form, and window alignment, and stresses integrating extensions to avoid an obvious “addition.” It outlines compliance expectations under building control and references the 45o Code geometry for protecting light to habitable-room windows.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/healthcare/","Healthcare",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/house-extension-design-guide-planning-and-leisure-department-45o-code/649764/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/house-extension-design-guide-planning-and-leisure-department-45o-code/649764.png","ImageObject",300,407,{"name":42,"@type":43},"WPS_1786070896","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-10","2026-10-24",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",6,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What general principles should guide a house extension design?","Question",{"text":63,"@type":64},"The extension should relate to the original house’s character, scale, materials, and design details, and should avoid unduly affecting neighbours. It should also respect the character of the area and be designed to meet required approvals and inspections.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How does the 45o Code affect extension placement?",{"text":68,"@type":64},"Extensions should be designed not to cross a line drawn at an angle of 45o from an adjoining neighbour’s nearest light-source window to a habitable room. For single-storey extensions the line is taken from the mid point of the opening, and for two-storey extensions the quarter point is used.",{"name":70,"@type":61,"acceptedAnswer":71},"What privacy and spacing rules apply to facing or side-facing windows?",{"text":72,"@type":64},"Facing habitable-room windows should be at least 22 metres apart to maintain reasonable privacy. Extensions with side-facing windows overlooking private gardens may be unacceptable, and minimum distances for front/rear facing windows versus two-storey walls are also specified.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},649764,1793073758,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,105,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":102,"show_sort_weight":103,"slug":104},"Technology",50,"technology",{"id":106,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":107,"slug":108},7,40,"healthcare",{"id":110,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},8,"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":97,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":106,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":110,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":143,"read_time":117,"preview_page_count":4},549768072016,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","HOUSE EXTENSION DESIGN GUIDE  \n\n| 1.0 | INTRODUCTION | (ii) Do not harm the occupiers of adjacent properties, i.e. daylight, outlook, privacy. |\n| --- | --- | --- |\n| 1.1 | These guidelines offer advice for householdersand their professional agents on the main principles of extending a house, without unduly affecting neighbours, and respecting the character of the area. The advice outlines the main considerations taken into account by the Council when assessing applications for extensions. Because of the diversity in house styles throughout the Borough, it is neither possible nor desirable to cover every eventuality. However general principles can be applied in the majority of cases.\u003Cbr>Some extensions and additions are permitted by the Town and Country Planning (General Permitted Development) Order 1995 without having to submit a planning application. Certain principles should apply to all extensions regardless of whether or not planning permission is required. However you are still advised to check with a Planning Officer in writing before starting work.\u003Cbr>Irrespective of whether planning permission is required you are likely to need approval under the Building Regulations. It should be stressed that Building Regulations and Development Control are separate Divisions within the same Department.\u003Cbr>The Building Control Division is responsible for carrying out Inspections of extensions to ensure they are structurally sound and comply with the Building Acts legislation. | (iii) Are of a high standard of design and layout and are compatible with the character of the surrounding area.\u003Cbr>These guidelines explain in more detail how these aims can be complied with. There may be examples of extensions in the area which do not comply with these guidelines. Any such examples should not be seen as a precedent and will not be accepted as a reason to allow a similar proposal.\u003Cbr>SCALE AND APPEARANCE\u003Cbr>2.2 When considering extending any house, it is important that the extension should relate to the design of the original building. Extensions should match roof shape and pitch (hipped or gabled) . New and existing windows should line through with each other horizontally and vertically and general proportions should be respected. |\n| 2. | GENERAL PRINCIPLES FOR ALL EXTENSIONS |  |\n| 2.1 | The Council seeks to ensure that house extensions and alterations:-\u003Cbr>(i) Relate to the character of the original house in terms of scale, materials and design details. | Extension is in scale with existing house |\n\nPLANNING AND LEISURE DEPARTMENT  \nTHE 45O CODE  \n2.4 The code aims to guide the size and designs of extensions in order to ensure that they do not seriously affect a neighbour’s outlook or daylighting. To comply with the 45o Code, extensions should be designed so as not to cross the appropriate line drawn at an angle of 45o from an adjoining neighbour’s nearest window which is also the main light source to a habitable room. For single storey extensions, the 45o line is taken from the mid point of the opening and for two storey extensions, the quarter point is used. (See also planning guidance note no.12 for further details) .  \nExtension is not integrated  \nEvery effort should be made to integrate the extension into the original design of the house so that it does not appear to be an obvious addition. This will usually require matching the design and materials of the original house in all respects.  \nDAYLIGHTING  \n2.3 Loss of daylighting to a neighbouring property is normally due to the position of extensions in relation to habitable room windows usually atthe rear of the house, i.e. where extensions project too far and/or are too high. The impact of any change in levels will also be taken into consideration.  \nExtensions to houses which mask a single window to a habitable room, i.e. the only light source, in side elevations of adjoining properties are unlikely to be acceptable.  \n(Habitable rooms are defined by this authority as lounges, sit","cbCaicRThi0kpkwJ","https://ap.wps.com/l/cbCaicRThi0kpkwJ","pdf",188899,"English","# Introduction\n## General principles for all extensions\n## Scale and appearance\n## Daylighting\n## The 45o code\n## Sunlightting\n## Overlooking and privacy\n## Immediate outlook","[{\"question\":\"What general principles should guide a house extension design?\",\"answer\":\"The extension should relate to the original house’s character, scale, materials, and design details, and should avoid unduly affecting neighbours. It should also respect the character of the area and be designed to meet required approvals and inspections.\"},{\"question\":\"How does the 45o Code affect extension placement?\",\"answer\":\"Extensions should be designed not to cross a line drawn at an angle of 45o from an adjoining neighbour’s nearest light-source window to a habitable room. For single-storey extensions the line is taken from the mid point of the opening, and for two-storey extensions the quarter point is used.\"},{\"question\":\"What privacy and spacing rules apply to facing or side-facing windows?\",\"answer\":\"Facing habitable-room windows should be at least 22 metres apart to maintain reasonable privacy. Extensions with side-facing windows overlooking private gardens may be unacceptable, and minimum distances for front/rear facing windows versus two-storey walls are also specified.\"}]","HOUSE EXTENSION DESIGN GUIDE - Planning and Leisure Department - 45o Code | PDF",1792806439]