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class=\"et_pb_column et_pb_column_2_3 et_pb_column_2_tb_body  et_pb_css_mix_blend_mode_passthrough\">\n\u003Cdiv class=\"et_pb_module et_pb_post_content et_pb_post_content_0_tb_body\">\n\u003Ch3 data-section-id=\"1n79fe9\" data-start=\"685\" data-end=\"706\">Project details\u003C\u002Fh3>\n\u003Cp data-start=\"707\" data-end=\"1154\">Service: overglazed extensions calculations\u003Cbr data-start=\"750\" data-end=\"753\">Client: Private residential homeowner \u002F design & build contractor\u003Cbr data-start=\"818\" data-end=\"821\">Project: Rear single-storey kitchen extension with large glazed rear façade and rooflights\u003Cbr data-start=\"911\" data-end=\"914\">Location: Kingston Vale, London SW15 \u003Cbr data-start=\"977\" data-end=\"980\">Regulation driver: Building Regulations Part O (overheating risk in domestic extensions)\u003Cbr data-start=\"1068\" data-end=\"1071\">ATSPACE team: Overheating assessment specialists, building compliance consultants\u003C\u002Fp>\n\u003Ch3 data-section-id=\"fgn2hc\" data-start=\"1156\" data-end=\"1181\">The headline result\u003C\u002Fh3>\n\u003Cp data-start=\"1183\" data-end=\"1331\">ATSPACE delivered overglazed extensions calculations that achieved first time compliance for a rear kitchen extension without any redesign delays.\u003C\u002Fp>\n\u003Cp data-start=\"1333\" data-end=\"1664\">The project featured a highly glazed extension with full-width sliding doors and multiple rooflights, creating a clear risk of overheating under Part O requirements. Through early assessment and practical guidance, ATSPACE confirmed compliance while preserving the original architectural design and avoiding programme disruption.\u003C\u002Fp>\n\u003Cp data-start=\"1666\" data-end=\"1950\">ATSPACE delivered:\u003Cbr data-start=\"1684\" data-end=\"1687\">Early-stage glazing risk review\u003Cbr data-start=\"1718\" data-end=\"1721\">Overglazed extensions calculations and assessment\u003Cbr data-start=\"1770\" data-end=\"1773\">Part O overheating compliance check\u003Cbr data-start=\"1808\" data-end=\"1811\">Practical ventilation and shading recommendations\u003Cbr data-start=\"1860\" data-end=\"1863\">Building Control-ready compliance report\u003Cbr data-start=\"1903\" data-end=\"1906\">No redesign or construction delay required\u003C\u002Fp>\n\u003Ch3 data-section-id=\"12t9m4w\" data-start=\"1952\" data-end=\"1974\">Project overview\u003C\u002Fh3>\n\u003Cp data-start=\"1976\" data-end=\"2257\">This project involved a domestic rear kitchen extension to a detached residential property in South West London. The proposed design created a bright, open-plan kitchen and dining space with extensive glazing, including a full-width glazed rear elevation and multiple rooflights.\u003C\u002Fp>\n\u003Cp data-start=\"2259\" data-end=\"2418\">While the design achieved strong architectural and daylighting goals, the level of glazing introduced a significant risk of overheating during warmer months.\u003C\u002Fp>\n\u003Cp data-start=\"2420\" data-end=\"2715\">ATSPACE was appointed during the technical design stage to complete overglazed extensions calculations to confirm compliance with Part O of the Building Regulations. The assessment was required before submission to Building Control to ensure the design could proceed without delay or redesign.\u003C\u002Fp>\n\u003Cp data-start=\"2717\" data-end=\"2922\">The key challenge was balancing thermal comfort and compliance with the client’s design intent, without compromising the visual quality of the extension or introducing costly changes late in the process.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"139icz0\" data-start=\"2924\" data-end=\"2953\">Why the service matters\u003C\u002Fh3>\n\u003Cp data-start=\"2955\" data-end=\"3253\">Overglazed extensions calculations are used to assess whether a domestic extension contains too much glazing relative to its ability to control heat gain. This is especially important in modern kitchen extensions where large glass doors and rooflights are commonly used to maximise natural light.\u003C\u002Fp>\n\u003Cp data-start=\"3255\" data-end=\"3460\">These calculations are required under Part O of the Building Regulations, which aims to reduce overheating risk in residential buildings and ensure acceptable internal comfort levels during warm weather.\u003C\u002Fp>\n\u003Cp data-start=\"3462\" data-end=\"3668\">This service is typically required for:\u003Cbr data-start=\"3501\" data-end=\"3504\">Rear kitchen and dining extensions\u003Cbr data-start=\"3538\" data-end=\"3541\">Extensions with large sliding or bifold doors\u003Cbr data-start=\"3586\" data-end=\"3589\">Designs with multiple rooflights\u003Cbr data-start=\"3621\" data-end=\"3624\">Highly glazed contemporary home extensions\u003C\u002Fp>\n\u003Cp data-start=\"3670\" data-end=\"3889\">The calculations help ensure:\u003Cbr data-start=\"3699\" data-end=\"3702\">Solar gains are controlled effectively\u003Cbr data-start=\"3740\" data-end=\"3743\">Internal spaces remain comfortable in summer\u003Cbr data-start=\"3787\" data-end=\"3790\">Ventilation strategies are adequate\u003Cbr data-start=\"3825\" data-end=\"3828\">The design meets Building Regulations approval requirements\u003C\u002Fp>\n\u003Cp data-start=\"3891\" data-end=\"4058\">If overglazed extensions calculations are not completed early, projects can face compliance failures, redesign requirements, and delays in Building Control approval.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"11s12pg\" data-start=\"4060\" data-end=\"4077\">The problem\u003C\u002Fh3>\n\u003Cp data-start=\"4079\" data-end=\"4304\">The proposed extension included a high proportion of glazing across both the rear elevation and roof structure. While this achieved strong daylight and aesthetic benefits, it significantly increased the risk of overheating.\u003C\u002Fp>\n\u003Cp data-start=\"4306\" data-end=\"4575\">Key issues included:\u003Cbr data-start=\"4326\" data-end=\"4329\">High glazing-to-floor area ratio across the extension\u003Cbr data-start=\"4382\" data-end=\"4385\">Multiple rooflights increasing solar exposure\u003Cbr data-start=\"4430\" data-end=\"4433\">Limited natural shading from surrounding structures\u003Cbr data-start=\"4484\" data-end=\"4487\">No initial overheating assessment completed\u003Cbr data-start=\"4530\" data-end=\"4533\">Unclear ventilation performance strategy\u003C\u002Fp>\n\u003Cp data-start=\"4577\" data-end=\"4723\">The project also required the design to remain unchanged, meaning any compliance solution had to work within the existing architectural concept.\u003C\u002Fp>\n\u003Cp data-start=\"4725\" data-end=\"4913\">Without overglazed extensions calculations, there was a risk that the proposal would fail Part O requirements, resulting in potential redesign or delays during Building Control approval.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"jlughc\" data-start=\"4915\" data-end=\"4949\">What ATSPACE was asked to do\u003C\u002Fh3>\n\u003Cp data-start=\"4951\" data-end=\"5325\">Carry out overglazed extensions calculations for the proposed design\u003Cbr data-start=\"5019\" data-end=\"5022\">Assess overheating risk under Part O requirements\u003Cbr data-start=\"5071\" data-end=\"5074\">Review glazing layout and thermal performance assumptions\u003Cbr data-start=\"5131\" data-end=\"5134\">Identify compliance risks early in the design stage\u003Cbr data-start=\"5185\" data-end=\"5188\">Provide practical mitigation advice where needed\u003Cbr data-start=\"5236\" data-end=\"5239\">Support Building Control submission requirements\u003Cbr data-start=\"5287\" data-end=\"5290\">Deliver a clear compliance report\u003C\u002Fp>\n\u003Ch3 data-section-id=\"bmbyk8\" data-start=\"5327\" data-end=\"5345\">Our approach\u003C\u002Fh3>\n\u003Cp data-start=\"5347\" data-end=\"5637\">Step 1: Understanding the compliance requirement\u003Cbr data-start=\"5395\" data-end=\"5398\">ATSPACE confirmed that the project required overglazed extensions calculations under Part O due to the high level of glazing and potential overheating risk. The assessment approach was defined to align with Building Control expectations.\u003C\u002Fp>\n\u003Cp data-start=\"5639\" data-end=\"5893\">Step 2: Reviewing design information\u003Cbr data-start=\"5675\" data-end=\"5678\">We reviewed architectural drawings, glazing specifications, rooflight positions and internal layout arrangements. This allowed us to assess heat gain risk and identify areas of concern within the extension design.\u003C\u002Fp>\n\u003Cp data-start=\"5895\" data-end=\"6282\">Step 3: Practical overheating mitigation advice\u003Cbr data-start=\"5942\" data-end=\"5945\">Before completing final calculations, ATSPACE provided practical recommendations, including:\u003Cbr data-start=\"6037\" data-end=\"6040\">Optimising glazing specification to reduce solar gain\u003Cbr data-start=\"6093\" data-end=\"6096\">Reviewing rooflight distribution to balance heat exposure\u003Cbr data-start=\"6153\" data-end=\"6156\">Improving natural ventilation opportunities through opening design\u003Cbr data-start=\"6222\" data-end=\"6225\">Considering simple shading strategies where appropriate\u003C\u002Fp>\n\u003Cp data-start=\"6284\" data-end=\"6398\">These recommendations were designed to maintain the original design intent without requiring structural changes.\u003C\u002Fp>\n\u003Cp data-start=\"6400\" data-end=\"6711\">Step 4: Clear compliance reporting\u003Cbr data-start=\"6434\" data-end=\"6437\">ATSPACE completed the overglazed extensions calculations and issued a structured report confirming compliance with Part O requirements. The documentation was suitable for submission to Building Control and demonstrated that overheating risk had been appropriately managed.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"176e6rf\" data-start=\"6713\" data-end=\"6762\">Real issues we faced and how we solved them\u003C\u002Fh3>\n\u003Cp data-start=\"6764\" data-end=\"7023\">Issue A: Excessive glazing across rear elevation\u003Cbr data-start=\"6812\" data-end=\"6815\">The extension design included a fully glazed rear façade.\u003Cbr data-start=\"6872\" data-end=\"6875\">How ATSPACE helped:\u003Cbr data-start=\"6894\" data-end=\"6897\">We assessed solar gain impact and recommended minor specification adjustments to bring performance within acceptable limits.\u003C\u002Fp>\n\u003Cp data-start=\"7025\" data-end=\"7251\">Issue B: Rooflight-driven heat gain risk\u003Cbr data-start=\"7065\" data-end=\"7068\">Multiple rooflights increased cumulative solar exposure.\u003Cbr data-start=\"7124\" data-end=\"7127\">How ATSPACE helped:\u003Cbr data-start=\"7146\" data-end=\"7149\">We refined the thermal assumptions and advised on placement optimisation to reduce overheating risk.\u003C\u002Fp>\n\u003Cp data-start=\"7253\" data-end=\"7500\">Issue C: Limited external shading\u003Cbr data-start=\"7286\" data-end=\"7289\">The property layout offered no meaningful external shading opportunities.\u003Cbr data-start=\"7362\" data-end=\"7365\">How ATSPACE helped:\u003Cbr data-start=\"7384\" data-end=\"7387\">We focused on ventilation performance and glazing specification to control overheating without altering design.\u003C\u002Fp>\n\u003Cp data-start=\"7502\" data-end=\"7744\">Issue D: Late-stage compliance requirement\u003Cbr data-start=\"7544\" data-end=\"7547\">The project required urgent assessment before Building Control submission.\u003Cbr data-start=\"7621\" data-end=\"7624\">How ATSPACE helped:\u003Cbr data-start=\"7643\" data-end=\"7646\">We prioritised rapid delivery of overglazed extensions calculations to avoid delays in approval.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"1j6c1zw\" data-start=\"7746\" data-end=\"7759\">Results\u003C\u002Fh3>\n\u003Cp data-start=\"7761\" data-end=\"8072\">Overglazed extensions calculations passed first time\u003Cbr data-start=\"7813\" data-end=\"7816\">Part O compliance achieved without redesign\u003Cbr data-start=\"7859\" data-end=\"7862\">No delay to Building Control approval\u003Cbr data-start=\"7899\" data-end=\"7902\">Full compliance report issued and accepted\u003Cbr data-start=\"7944\" data-end=\"7947\">Overheating risk successfully controlled\u003Cbr data-start=\"7987\" data-end=\"7990\">Client retained original design intent\u003Cbr data-start=\"8028\" data-end=\"8031\">Programme maintained without disruption\u003C\u002Fp>\n\u003Ch3 data-section-id=\"1bmn0eq\" data-start=\"8074\" data-end=\"8104\">What this project proves\u003C\u002Fh3>\n\u003Cp data-start=\"8106\" data-end=\"8270\">This project demonstrates that overglazed extensions calculations are essential for ensuring compliance in modern domestic extensions with high levels of glazing.\u003C\u002Fp>\n\u003Cp data-start=\"8272\" data-end=\"8459\">When carried out early, they allow teams to:\u003Cbr data-start=\"8316\" data-end=\"8319\">Maintain architectural design intent\u003Cbr data-start=\"8355\" data-end=\"8358\">Avoid costly redesigns\u003Cbr data-start=\"8380\" data-end=\"8383\">Prevent Building Control delays\u003Cbr data-start=\"8414\" data-end=\"8417\">Ensure comfortable internal environments\u003C\u002Fp>\n\u003Cp data-start=\"8461\" data-end=\"8615\">Overglazed extensions calculations are not just a regulatory requirement but a practical design tool that supports better-performing residential spaces.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"icdteb\" data-start=\"8617\" data-end=\"8631\">Mini FAQ\u003C\u002Fh3>\n\u003Cp data-start=\"8633\" data-end=\"8828\">What are overglazed extensions calculations?\u003Cbr data-start=\"8677\" data-end=\"8680\">They are assessments used to determine whether a domestic extension has excessive glazing that could lead to overheating under Part O regulations.\u003C\u002Fp>\n\u003Cp data-start=\"8830\" data-end=\"8986\">When do I need overglazed extensions calculations?\u003Cbr data-start=\"8880\" data-end=\"8883\">They are typically required for kitchen or rear extensions with large areas of glazing or rooflights.\u003C\u002Fp>\n\u003Cp data-start=\"8988\" data-end=\"9142\">Do overglazed extensions always fail Part O?\u003Cbr data-start=\"9032\" data-end=\"9035\">No, compliance can often be achieved with correct design assumptions and minor specification adjustments.\u003C\u002Fp>\n\u003Cp data-start=\"9144\" data-end=\"9293\">Why is overheating a problem in extensions?\u003Cbr data-start=\"9187\" data-end=\"9190\">Large glazed areas can trap heat, especially in summer, leading to uncomfortable internal conditions.\u003C\u002Fp>\n\u003Cp data-start=\"9295\" data-end=\"9443\">Can I keep my design if calculations show risk?\u003Cbr data-start=\"9342\" data-end=\"9345\">In many cases yes, small adjustments to glazing or ventilation are enough to achieve compliance.\u003C\u002Fp>\n\u003Cp data-start=\"9445\" data-end=\"9570\">Who needs these calculations?\u003Cbr data-start=\"9474\" data-end=\"9477\">Homeowners, architects, designers and contractors working on glazed residential extensions.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"gdtiox\" data-start=\"9572\" data-end=\"9592\">Call to action\u003C\u002Fh3>\n\u003Cp data-start=\"9594\" data-end=\"9653\">Need overglazed extensions calculations for your project?\u003C\u002Fp>\n\u003Cp data-start=\"9655\" data-end=\"9871\" data-is-last-node=\"\" data-is-only-node=\"\">ATSPACE supports homeowners, contractors and design teams in achieving clear Part O compliance for glazed extensions without redesign delays. Send your project details and we will confirm requirements and next steps\u003C\u002Fp>\n\u003C\u002Fdiv>\n\u003C\u002Fdiv>","py-7","px-5","2026-04-30T10:51:41.000000Z","2026-04-30T11:10:09.000000Z",{"id":160,"user_id":245,"parent_id":7,"page_type_id":7,"linked_page_id":7,"title":246,"slug":247,"full_url":248,"live":11,"data_model":249,"created_at":250,"updated_at":250,"text_content_only":251,"html_content_only":251,"is_homepage":8,"is_template":8,"is_password_protected":8,"page_password":7,"parent":7},1,"Case 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