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The guidance explains how to approach neighbours before submission, incorporate their views, and evaluate potential impacts on privacy, sunlight and daylight, and outlook. It details requirements for foundations, overhangs, and access or maintenance consent, plus assessment methods such as the 45° daylight plane and follow-up 3-D evaluation using rotated 25° rising planes.","DESIGN GUIDANCE FOR HOUSE EXTENSIONS  \nINTRODUCTION  \nGood design is desirable both for its own sake and to enhance our physical environment. Poor or mediocre design is often a reason for public opposition to new buildings. This advice note is intended to assist in achieving well designed house extensions. It is not intended to be comprehensive nor should it stifle imaginative architectural designs where these accord with the Council's overall policy on house extensions.  \nThis note gives guidance on four main aspects.  \n1. Neighbourliness  \n2. Respecting the character of the property  \n3. Respecting the character of the locality  \n4. Particular types of extension.  \nNEIGHBOURLINESS  \nBefore submitting an application it is worth talking first to your neighbours. They may have suggestions that could be incorporated in the design. It is also best that they hear of the proposal first from you rather than when the Council notifies them of the proposal. Any views they express to the Council will be taken into account in assessing the application.  \nNeighbours in turn have to recognise the Government's advice that the basic question for the planning authority is not whether they would experience financial or other loss from a potential development. Rather it is whether the proposal would unacceptably affect amenities which ought to be protected in the public interest. Good neighbourliness is one of the yardsticks against which development proposals can be measured. This includes privacy, sunlight and daylight, and outlook.  \nA neighbour's permission is required if foundations encroach or if an extension overhangs or attaches to their property. Their consent will also be needed if access to their property is necessary during construction, or for subsequent maintenance.  \nDaylighting  \nThe extension should not cause any significant loss of daylight or sunlight to living rooms, dining areas, studies or bedrooms in neighbouring properties nor unreasonably reduce sunlight to neighbouring gardens to a substantial degree. Aspect is an important consideration. For instance, an adjacent property is more likely to suffer a reduction in sunlight if the extension is on its southern side.  \nIn assessing the likely impact of an extension to a dwelling on an adjacent property two guidelines are generally employed.  \nThe illustration over the page shows the use of a 45° plane plotted from an adjacent property's window or patio door at ground floor level. If the extension extends beyond the 45° plane (plan B) then this suggests that the passage of light to the neighbouring property's habitable rooms might be significantly affected. This is only a general rule, and factors such as the nature of the room affected,(a ground floor living room being more sensitive than a bathroom), the aspect of the room affected, the size of the window relative to ground levels and whether there are any further and larger unaffected windows lighting the same room, will also be taken into account.  \n\n| \u003Cbr>| |\n| --- | --- |\n| |  |\n| The single storey extension shown above iascceptable if its depth is limited as shown in plan (a). However, should it extend usrthewn in plan (b) then it may\u003Cbr>eeptable |  |\n\nProposed extension  \nReduction in natural light to neighbouring house also failing the 45􀀒test  \nIf an extension fails the above test it may be acceptable when a second guideline is applied based upon the Building Research Establishment's good practice guide. This involves considering the 3-D effects of the proposal in more detail. Under this guideline the 90° angle created by the two 45° planes diverging from a ground floor level window are rotated 25° from the horizontal. Any obstructions above the 25° rising plane would be likely to significantly reduce daylight to the neighbouring property's habitable rooms (see illustration below)  \n\n| | |\n| --- | --- |\n\nThe extension shown above encroaches across the 45° line. However, if the extension is single storey only (drawi","cbCaibqXb1bDjIDY","https://ap.wps.com/l/cbCaibqXb1bDjIDY","pdf",194786,5,1,10,"English","en",105,"# Introduction\n# Neighbourliness\n## Daylighting\n## Privacy\n## Outlook\n# Respecting the Character of the Property","[{\"question\":\"Why should you talk to neighbours before submitting a house extension application?\",\"answer\":\"Talk to neighbours first so they can share suggestions and hear about the proposal from you rather than from the council. Their views will be considered when assessing the application.\"},{\"question\":\"How does the 45° plane guideline help assess daylight impact?\",\"answer\":\"The 45° plane is plotted from an adjacent property’s window or patio door at ground floor level. If the extension goes beyond that plane, it suggests habitable rooms may receive significantly less light, though other factors are also considered.\"},{\"question\":\"When is a house extension likely to be unacceptable due to overlooking and privacy?\",\"answer\":\"An extension should not cause substantial loss of privacy. Avoid side windows above ground floor level or windows that allow views into neighbouring houses, while obscure or high level bathroom windows may be acceptable; planning acceptability also depends on required window sizes under Building Regulations.\"}]","DESIGN GUIDANCE FOR HOUSE EXTENSIONS - Neighbourliness | PDF",1792874185,25,{"code":4,"msg":5,"data":32},[33,38,43,48,52,57,60,65,70,73,76],{"id":21,"doc_module":4,"doc_module_name":34,"category_name":35,"show_sort_weight":36,"slug":37},"Document","Story & Novel",90,"story-novel",{"id":39,"doc_module":4,"doc_module_name":34,"category_name":40,"show_sort_weight":41,"slug":42},2,"Literature",80,"literature",{"id":44,"doc_module":4,"doc_module_name":34,"category_name":45,"show_sort_weight":46,"slug":47},4,"Exam",70,"exam",{"id":20,"doc_module":4,"doc_module_name":34,"category_name":49,"show_sort_weight":50,"slug":51},"Comic",60,"comic",{"id":53,"doc_module":4,"doc_module_name":34,"category_name":54,"show_sort_weight":55,"slug":56},6,"Technology",50,"technology",{"id":11,"doc_module":4,"doc_module_name":34,"category_name":12,"show_sort_weight":58,"slug":59},40,"healthcare",{"id":61,"doc_module":4,"doc_module_name":34,"category_name":62,"show_sort_weight":63,"slug":64},8,"Research & Report",30,"research-report",{"id":66,"doc_module":4,"doc_module_name":34,"category_name":67,"show_sort_weight":68,"slug":69},9,"Religion & Spirituality",20,"religion-spirituality",{"id":68,"doc_module":4,"doc_module_name":34,"category_name":71,"show_sort_weight":68,"slug":72},"World Cup","world-cup",{"id":22,"doc_module":4,"doc_module_name":34,"category_name":74,"show_sort_weight":22,"slug":75},"Lifestyle","lifestyle",{"id":77,"doc_module":4,"doc_module_name":34,"category_name":78,"show_sort_weight":20,"slug":79},19,"General","general",{"code":4,"msg":81,"data":82},"ok",{"site_id":25,"language":24,"slug":83,"title":13,"keywords":84,"description":14,"schema_data":85,"social_meta":139,"head_meta":141,"extra_data":143,"updated_unix":144},"design-guidance-for-house-extensions-neighbourliness","",{"@graph":86,"@context":138},[87,101,121],{"@type":88,"itemListElement":89},"BreadcrumbList",[90,94,96,99],{"item":91,"name":92,"@type":93,"position":21},"https://docshare.wps.com","Home","ListItem",{"item":95,"name":34,"@type":93,"position":39},"https://docshare.wps.com/document/",{"item":97,"name":12,"@type":93,"position":98},"https://docshare.wps.com/document/healthcare/",3,{"item":100,"name":13,"@type":93,"position":44},"https://docshare.wps.com/document/design-guidance-for-house-extensions-neighbourliness/651433/",{"url":100,"name":13,"@type":102,"image":103,"author":108,"headline":13,"publisher":110,"fileFormat":113,"inLanguage":24,"description":14,"dateModified":114,"datePublished":115,"encodingFormat":113,"isAccessibleForFree":116,"interactionStatistic":117},"DigitalDocument",{"url":104,"@type":105,"width":106,"height":107},"https://docshare.wps.com/thumbnails/design-guidance-for-house-extensions-neighbourliness/651433.png","ImageObject",300,407,{"name":9,"@type":109},"Person",{"url":91,"name":111,"@type":112},"DocShare","Organization","application/pdf","2026-11-10","2026-10-24",true,{"@type":118,"interactionType":119,"userInteractionCount":20},"InteractionCounter",{"@type":120},"ViewAction",{"@type":122,"mainEntity":123},"FAQPage",[124,130,134],{"name":125,"@type":126,"acceptedAnswer":127},"Why should you talk to neighbours before submitting a house extension application?","Question",{"text":128,"@type":129},"Talk to neighbours first so they can share suggestions and hear about the proposal from you rather than from the council. Their views will be considered when assessing the application.","Answer",{"name":131,"@type":126,"acceptedAnswer":132},"How does the 45° plane guideline help assess daylight impact?",{"text":133,"@type":129},"The 45° plane is plotted from an adjacent property’s window or patio door at ground floor level. If the extension goes beyond that plane, it suggests habitable rooms may receive significantly less light, though other factors are also considered.",{"name":135,"@type":126,"acceptedAnswer":136},"When is a house extension likely to be unacceptable due to overlooking and privacy?",{"text":137,"@type":129},"An extension should not cause substantial loss of privacy. Avoid side windows above ground floor level or windows that allow views into neighbouring houses, while obscure or high level bathroom windows may be acceptable; planning acceptability also depends on required window sizes under Building Regulations.","https://schema.org",{"og:url":100,"og:type":140,"og:title":13,"og:site_name":111,"og:description":14},"article",{"robots":142,"canonical":100},"index,follow",{"doc_id":7,"site_id":25},1793073951]