[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"page-\u002Fcase-studies\u002Fpreventing-overheating-in-apartments-using-tm59-analysis-on-a-tight-urban-site":3,"atspace-main-nav":383,"atspace-footer-navs":411},{"data":4},{"id":5,"user_id":6,"parent_id":7,"page_type_id":8,"linked_page_id":9,"title":10,"slug":11,"full_url":12,"live":13,"data_model":14,"created_at":92,"updated_at":93,"is_homepage":20,"is_template":20,"parent":94,"seometa":102,"page_type":115,"page_type_values":142,"linked_page":9,"theme_styles":151},185,7,21,2,null,"Preventing Overheating in Apartments Using TM59 Analysis on a Tight Urban 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Container","main_nested","877549aa-8bc7-474b-8261-ce43bdf39dfd",[39,55],[40,45],{"colSpan":29,"colSpanSM":41,"colSpanMD":42,"colSpanLG":43,"customColSpan":20,"bgColor":9,"borderWidth":9,"borderColor":9,"borderRadius":9,"classes":9,"id":44,"borderPosition":9},"sm:col-span-6","md:col-span-6","lg:col-span-6","f5aab5dd-4d72-423a-87fb-ae305112af49",{"name":46,"componentName":47,"group":48,"margin":9,"padding":9,"classes":9,"bgImage":9,"id":49,"originalModel":50},"WYSIWYG Editor","Wysiwyg","content","ee86e31b-348d-41ae-aea6-b0a20400b9d2",{"proseEnabled":20,"content":51,"lineHeightClass":52,"trackingClass":53,"spacingClass":54},"\u003Ch1 class=\"text-4xl md:text-5xl text-theme-dark-green font-medium mb-10 md:mb-0\" style=\"text-align: left;\">Preventing Overheating in Apartments Using TM59 Analysis on a Tight Urban Site\u003C\u002Fh1>","leading-relaxed","tracking-normal","[&_p]:my-0 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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\u003Csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&:has([data-writing-block])>*]:pointer-events-auto [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:b385a407-4f3c-49d6-b29e-8a7d8d96a91f-5\" data-testid=\"conversation-turn-12\" data-scroll-anchor=\"false\" data-turn=\"assistant\">\n\u003Cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\u002Fmain:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\u002Fmain:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\">\n\u003Cdiv class=\"[--thread-content-max-width:40rem] @w-lg\u002Fmain:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\u002Fturn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\">\n\u003Cdiv class=\"flex max-w-full flex-col gap-4 grow\">\n\u003Cdiv data-message-author-role=\"assistant\" data-message-id=\"eec7268e-d368-433f-b7b4-7875a3873fad\" dir=\"auto\" data-message-model-slug=\"gpt-5-3-mini\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+&]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\">\n\u003Cdiv class=\"flex w-full flex-col gap-1 empty:hidden\">\n\u003Cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\">\n\u003Ch3 data-section-id=\"1n79fe9\" data-start=\"646\" data-end=\"667\">Project details\u003C\u002Fh3>\n\u003Cp data-start=\"668\" data-end=\"1047\">Service: Overheating assessments\u003Cbr data-start=\"700\" data-end=\"703\">Client: UK residential developer\u003Cbr data-start=\"735\" data-end=\"738\">Project: 22-unit apartment scheme on constrained brownfield site\u003Cbr data-start=\"802\" data-end=\"805\">Location: Camden Wharf District, London NW1 \u003Cbr data-start=\"879\" data-end=\"882\">Regulation driver: Building Regulations Part O and TM59 compliance requirements\u003Cbr data-start=\"961\" data-end=\"964\">ATSPACE team: Overheating assessment specialists, building compliance consultants\u003C\u002Fp>\n\u003Ch3 data-section-id=\"fgn2hc\" data-start=\"1049\" data-end=\"1074\">The headline result\u003C\u002Fh3>\n\u003Cp data-start=\"1076\" data-end=\"1268\">ATSPACE delivered TM59 overheating analysis that successfully prevented overheating risks across a constrained urban apartment scheme in London, achieving compliance first time under Part O.\u003C\u002Fp>\n\u003Cp data-start=\"1270\" data-end=\"1571\">The project site presented significant challenges due to limited space, high glazing ratios and surrounding urban density. Through early-stage modelling and practical design guidance, ATSPACE ensured all apartments met overheating criteria without requiring major design changes or programme delays.\u003C\u002Fp>\n\u003Cp data-start=\"1573\" data-end=\"1845\">ATSPACE delivered:\u003Cbr data-start=\"1591\" data-end=\"1594\">Early-stage design overheating review\u003Cbr data-start=\"1631\" data-end=\"1634\">TM59 dynamic thermal modelling\u003Cbr data-start=\"1664\" data-end=\"1667\">Risk identification for high-exposure units\u003Cbr data-start=\"1710\" data-end=\"1713\">Practical mitigation recommendations\u003Cbr data-start=\"1749\" data-end=\"1752\">Compliance reporting for Building Control\u003Cbr data-start=\"1793\" data-end=\"1796\">Reduced risk of redesign and late-stage failure\u003C\u002Fp>\n\u003Ch3 data-section-id=\"12t9m4w\" data-start=\"1847\" data-end=\"1869\">Project overview\u003C\u002Fh3>\n\u003Cp data-start=\"1871\" data-end=\"2181\">This project involved a 22-unit residential apartment development located on a tight urban brownfield site in London. The scheme was designed to maximise unit yield within strict planning constraints, resulting in a compact building form with high exposure glazing and limited external shading opportunities.\u003C\u002Fp>\n\u003Cp data-start=\"2183\" data-end=\"2489\">ATSPACE was appointed during the detailed design stage, when concerns were raised about potential overheating risks in several south and west-facing apartments. With construction due to progress shortly, the client required a clear and reliable TM59 overheating analysis to ensure compliance with Part O.\u003C\u002Fp>\n\u003Cp data-start=\"2491\" data-end=\"2673\">The primary objective was to prevent overheating in apartments while maintaining the architectural intent and avoiding late-stage design alterations that could delay the programme.\u003C\u002Fp>\n\u003Cp data-start=\"2675\" data-end=\"2865\">The project required careful balancing of:\u003Cbr data-start=\"2717\" data-end=\"2720\">Maximised daylight and glazing\u003Cbr data-start=\"2750\" data-end=\"2753\">Urban heat island effects\u003Cbr data-start=\"2778\" data-end=\"2781\">Restricted site layout and orientation\u003Cbr data-start=\"2819\" data-end=\"2822\">Compliance with TM59 and Part O standards\u003C\u002Fp>\n\u003Cp data-start=\"2867\" data-end=\"3007\">Timing was critical, as any failure at assessment stage would have led to costly redesign and potential delays to construction milestones.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"139icz0\" data-start=\"3009\" data-end=\"3038\">Why the service matters\u003C\u002Fh3>\n\u003Cp data-start=\"3040\" data-end=\"3264\">TM59 overheating analysis is a method used to assess the risk of overheating in residential buildings. It uses dynamic thermal modelling to simulate how indoor temperatures respond to external weather conditions over time.\u003C\u002Fp>\n\u003Cp data-start=\"3266\" data-end=\"3522\">Preventing overheating in apartments has become increasingly important due to modern construction methods. Improved insulation and airtightness, while beneficial for energy efficiency under Part L, can trap heat within buildings if not properly designed.\u003C\u002Fp>\n\u003Cp data-start=\"3524\" data-end=\"3775\">This service is typically required by developers, architects, and consultants working on residential schemes, particularly in dense urban environments. It is also frequently required to demonstrate compliance with Part O of the Building Regulations.\u003C\u002Fp>\n\u003Cp data-start=\"3777\" data-end=\"4052\">TM59 overheating analysis helps ensure that:\u003Cbr data-start=\"3821\" data-end=\"3824\">Apartment temperatures remain within acceptable comfort limits\u003Cbr data-start=\"3886\" data-end=\"3889\">Designs include adequate ventilation and shading strategies\u003Cbr data-start=\"3948\" data-end=\"3951\">Solar gains are properly controlled\u003Cbr data-start=\"3986\" data-end=\"3989\">Compliance evidence is provided for Building Control approval\u003C\u002Fp>\n\u003Cp data-start=\"4054\" data-end=\"4237\">If overheating analysis is left too late, it can lead to serious project risks including failed compliance, redesign requirements, increased construction costs and delayed handover.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"11s12pg\" data-start=\"4239\" data-end=\"4256\">The problem\u003C\u002Fh3>\n\u003Cp data-start=\"4258\" data-end=\"4347\">The project faced several key challenges typical of tight urban apartment developments.\u003C\u002Fp>\n\u003Cp data-start=\"4349\" data-end=\"4580\">The building form included extensive glazing to maximise natural light, but this significantly increased solar gain risk. The site was heavily constrained, limiting the ability to introduce external shading or adjust orientation.\u003C\u002Fp>\n\u003Cp data-start=\"4582\" data-end=\"4911\">Several design issues were identified early:\u003Cbr data-start=\"4626\" data-end=\"4629\">Inconsistent glazing specifications across drawings\u003Cbr data-start=\"4680\" data-end=\"4683\">Unclear ventilation assumptions for multiple units\u003Cbr data-start=\"4733\" data-end=\"4736\">Limited coordination between architectural and M&E design teams\u003Cbr data-start=\"4799\" data-end=\"4802\">High exposure of top-floor apartments to solar gain\u003Cbr data-start=\"4853\" data-end=\"4856\">Late-stage design changes not reflected in all models\u003C\u002Fp>\n\u003Cp data-start=\"4913\" data-end=\"5123\">There was also pressure from the construction programme, with little tolerance for delay. The client needed assurance that the apartments would pass TM59 requirements without requiring major design revisions.\u003C\u002Fp>\n\u003Cp data-start=\"5125\" data-end=\"5255\">Without intervention, there was a real risk of overheating failures in multiple units, particularly those facing south and west.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"jlughc\" data-start=\"5257\" data-end=\"5291\">What ATSPACE was asked to do\u003C\u002Fh3>\n\u003Cp data-start=\"5293\" data-end=\"5672\">Carry out TM59 overheating analysis for all 22 apartments\u003Cbr data-start=\"5350\" data-end=\"5353\">Identify overheating risks in early-stage design\u003Cbr data-start=\"5401\" data-end=\"5404\">Confirm compliance with Part O requirements\u003Cbr data-start=\"5447\" data-end=\"5450\">Review architectural and M&E design information\u003Cbr data-start=\"5497\" data-end=\"5500\">Provide practical mitigation strategies to reduce overheating risk\u003Cbr data-start=\"5566\" data-end=\"5569\">Support design team with compliance-driven recommendations\u003Cbr data-start=\"5627\" data-end=\"5630\">Deliver Building Control-ready reporting\u003C\u002Fp>\n\u003Ch3 data-section-id=\"bmbyk8\" data-start=\"5674\" data-end=\"5692\">Our approach\u003C\u002Fh3>\n\u003Cp data-start=\"5694\" data-end=\"5982\">Step 1: Understanding the compliance requirement\u003Cbr data-start=\"5742\" data-end=\"5745\">ATSPACE confirmed the requirement for TM59 dynamic thermal modelling in line with Part O. The focus was on ensuring that overheating risk was assessed across all residential units under realistic occupancy and environmental conditions.\u003C\u002Fp>\n\u003Cp data-start=\"5984\" data-end=\"6256\">Step 2: Reviewing the information and design assumptions\u003Cbr data-start=\"6040\" data-end=\"6043\">We carried out a full review of drawings, glazing ratios, ventilation strategies and building orientation. This identified several inconsistencies that needed resolving before modelling could proceed accurately.\u003C\u002Fp>\n\u003Cp data-start=\"6258\" data-end=\"6646\">Step 3: Practical overheating prevention advice\u003Cbr data-start=\"6305\" data-end=\"6308\">Before completing final analysis, ATSPACE provided targeted recommendations to prevent overheating in apartments, including:\u003Cbr data-start=\"6432\" data-end=\"6435\">Optimising glazing performance in high-risk elevations\u003Cbr data-start=\"6489\" data-end=\"6492\">Improving natural cross-ventilation opportunities\u003Cbr data-start=\"6541\" data-end=\"6544\">Adjusting shading assumptions where feasible\u003Cbr data-start=\"6588\" data-end=\"6591\">Refining window opening areas for airflow performance\u003C\u002Fp>\n\u003Cp data-start=\"6648\" data-end=\"6729\">These measures were practical and did not require major architectural redesign.\u003C\u002Fp>\n\u003Cp data-start=\"6731\" data-end=\"7004\">Step 4: Clear TM59 reporting for compliance\u003Cbr data-start=\"6774\" data-end=\"6777\">ATSPACE completed the dynamic thermal modelling and issued a structured TM59 overheating analysis report. The report clearly demonstrated compliance with Part O and identified all units as passing under the required criteria.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"176e6rf\" data-start=\"7006\" data-end=\"7055\">Real issues we faced and how we solved them\u003C\u002Fh3>\n\u003Cp data-start=\"7057\" data-end=\"7346\">Issue A: High overheating risk in south-facing apartments\u003Cbr data-start=\"7114\" data-end=\"7117\">Several units showed elevated internal temperatures due to solar exposure.\u003Cbr data-start=\"7191\" data-end=\"7194\">How ATSPACE helped:\u003Cbr data-start=\"7213\" data-end=\"7216\">We refined glazing performance inputs and improved ventilation assumptions, reducing peak temperatures and achieving compliance.\u003C\u002Fp>\n\u003Cp data-start=\"7348\" data-end=\"7577\">Issue B: Inconsistent design data\u003Cbr data-start=\"7381\" data-end=\"7384\">Different drawing sets showed conflicting glazing specifications.\u003Cbr data-start=\"7449\" data-end=\"7452\">How ATSPACE helped:\u003Cbr data-start=\"7471\" data-end=\"7474\">We standardised inputs with the design team before modelling, ensuring accurate and reliable results.\u003C\u002Fp>\n\u003Cp data-start=\"7579\" data-end=\"7811\">Issue C: Limited shading opportunities\u003Cbr data-start=\"7617\" data-end=\"7620\">Urban constraints prevented external shading additions.\u003Cbr data-start=\"7675\" data-end=\"7678\">How ATSPACE helped:\u003Cbr data-start=\"7697\" data-end=\"7700\">We optimised internal design assumptions and ventilation strategies to compensate without structural changes.\u003C\u002Fp>\n\u003Cp data-start=\"7813\" data-end=\"8074\">Issue D: Tight programme deadlines\u003Cbr data-start=\"7847\" data-end=\"7850\">The project required rapid turnaround to maintain construction schedule.\u003Cbr data-start=\"7922\" data-end=\"7925\">How ATSPACE helped:\u003Cbr data-start=\"7944\" data-end=\"7947\">We prioritised high-risk analysis first and streamlined the modelling process to meet deadlines without compromising quality.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"1j6c1zw\" data-start=\"8076\" data-end=\"8089\">Results\u003C\u002Fh3>\n\u003Cp data-start=\"8091\" data-end=\"8396\">TM59 overheating compliance achieved first time\u003Cbr data-start=\"8138\" data-end=\"8141\">No redesign required\u003Cbr data-start=\"8161\" data-end=\"8164\">All 22 apartments passed overheating criteria\u003Cbr data-start=\"8209\" data-end=\"8212\">No delay to construction programme\u003Cbr data-start=\"8246\" data-end=\"8249\">Building Control-ready compliance report issued\u003Cbr data-start=\"8296\" data-end=\"8299\">Overheating risks successfully mitigated\u003Cbr data-start=\"8339\" data-end=\"8342\">Client confidence maintained throughout design stage\u003C\u002Fp>\n\u003Ch3 data-section-id=\"1bmn0eq\" data-start=\"8398\" data-end=\"8428\">What this project proves\u003C\u002Fh3>\n\u003Cp data-start=\"8430\" data-end=\"8561\">This project demonstrates that preventing overheating in apartments is most effective when addressed early in the design process.\u003C\u002Fp>\n\u003Cp data-start=\"8563\" data-end=\"8702\">TM59 overheating analysis is not just a compliance requirement, it is a design tool that helps identify risks before construction begins.\u003C\u002Fp>\n\u003Cp data-start=\"8704\" data-end=\"8895\">When managed correctly, it allows teams to:\u003Cbr data-start=\"8747\" data-end=\"8750\">Avoid late-stage redesign\u003Cbr data-start=\"8775\" data-end=\"8778\">Maintain architectural intent\u003Cbr data-start=\"8807\" data-end=\"8810\">Reduce compliance risk\u003Cbr data-start=\"8832\" data-end=\"8835\">Deliver comfortable and future-proof residential buildings\u003C\u002Fp>\n\u003Cp data-start=\"8897\" data-end=\"9032\">A structured approach to overheating analysis ensures smoother project delivery and fewer surprises during Building Control approval.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"icdteb\" data-start=\"9034\" data-end=\"9048\">Mini FAQ\u003C\u002Fh3>\n\u003Cp data-start=\"9050\" data-end=\"9237\">What is TM59 overheating analysis?\u003Cbr data-start=\"9084\" data-end=\"9087\">TM59 overheating analysis is a modelling method used to assess the risk of overheating in residential buildings using dynamic simulation techniques.\u003C\u002Fp>\n\u003Cp data-start=\"9239\" data-end=\"9418\">Why is overheating a problem in apartments?\u003Cbr data-start=\"9282\" data-end=\"9285\">Apartments are often highly insulated and airtight, which can trap heat, especially in urban environments with high solar exposure.\u003C\u002Fp>\n\u003Cp data-start=\"9420\" data-end=\"9568\">When is TM59 analysis required?\u003Cbr data-start=\"9451\" data-end=\"9454\">It is typically required during design stages to demonstrate compliance with Part O of the Building Regulations.\u003C\u002Fp>\n\u003Cp data-start=\"9570\" data-end=\"9729\">Can overheating analysis prevent design changes?\u003Cbr data-start=\"9618\" data-end=\"9621\">Yes, early TM59 analysis helps identify risks before construction, reducing the need for costly redesigns.\u003C\u002Fp>\n\u003Cp data-start=\"9731\" data-end=\"9891\">What buildings need overheating assessments?\u003Cbr data-start=\"9775\" data-end=\"9778\">Most new residential developments, particularly apartments in urban locations, require overheating assessments.\u003C\u002Fp>\n\u003Cp data-start=\"9893\" data-end=\"10042\">Can ATSPACE help late in the project?\u003Cbr data-start=\"9930\" data-end=\"9933\">Yes, ATSPACE can support both early-stage and late-stage projects to resolve overheating compliance issues.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"gdtiox\" data-start=\"10044\" data-end=\"10064\">Call to action\u003C\u002Fh3>\n\u003Cp data-start=\"10066\" data-end=\"10129\">Need help with TM59 overheating analysis for your apartments?\u003C\u002Fp>\n\u003Cp data-start=\"10131\" data-end=\"10368\" data-is-last-node=\"\" data-is-only-node=\"\">ATSPACE works with developers, architects and consultants to prevent overheating in residential buildings and achieve clear compliance with Part O. 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