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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-16\" data-testid=\"conversation-turn-34\" 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=\"ea0382ab-b190-47ae-897f-5708559831ce\" 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\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-17\" data-testid=\"conversation-turn-36\" 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=\"c827356c-3ea9-4a10-9785-b06ff96a3fa9\" 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=\"653\" data-end=\"674\">Project details\u003C\u002Fh3>\n\u003Cp data-start=\"675\" data-end=\"1091\">Service: PSI value calculations\u003Cbr data-start=\"706\" data-end=\"709\">Client: UK residential developer\u003Cbr data-start=\"741\" data-end=\"744\">Project: 24 new build homes (mix of semi-detached and terraced dwellings)\u003Cbr data-start=\"817\" data-end=\"820\">Location: Hawthorn View Development, Sevenoaks, Kent TN13 (fictional)\u003Cbr data-start=\"889\" data-end=\"892\">Regulation driver: Building Regulations Part L (SAP compliance and energy performance assessment)\u003Cbr data-start=\"989\" data-end=\"992\">ATSPACE team: Building energy compliance consultants, SAP assessors, thermal bridging specialists\u003C\u002Fp>\n\u003Ch3 data-section-id=\"fgn2hc\" data-start=\"1093\" data-end=\"1118\">The headline result\u003C\u002Fh3>\n\u003Cp data-start=\"1119\" data-end=\"1285\">ATSPACE delivered PSI value calculations for a 24-unit residential development, supporting SAP assessments that achieved compliance first time across all dwellings.\u003C\u002Fp>\n\u003Cp data-start=\"1287\" data-end=\"1615\">The project required accurate thermal bridging inputs to ensure SAP calculations reflected real-world construction details and met Part L requirements. Through detailed PSI value analysis and coordinated energy modelling support, ATSPACE enabled the design team to secure Building Control approval without revisions or delays.\u003C\u002Fp>\n\u003Cp data-start=\"1617\" data-end=\"1963\">ATSPACE delivered:\u003Cbr data-start=\"1635\" data-end=\"1638\">Full PSI value calculation set for all key junctions\u003Cbr data-start=\"1690\" data-end=\"1693\">Thermal bridging inputs for SAP energy modelling\u003Cbr data-start=\"1741\" data-end=\"1744\">Part L compliance support across all dwelling types\u003Cbr data-start=\"1795\" data-end=\"1798\">Review of junction details and construction assumptions\u003Cbr data-start=\"1853\" data-end=\"1856\">Optimised thermal performance inputs for SAP submission\u003Cbr data-start=\"1911\" data-end=\"1914\">Building Control-ready compliance documentation\u003C\u002Fp>\n\u003Ch3 data-section-id=\"12t9m4w\" data-start=\"1965\" data-end=\"1987\">Project overview\u003C\u002Fh3>\n\u003Cp data-start=\"1988\" data-end=\"2294\">This residential development consisted of 24 new build homes, including a combination of two-storey semi-detached houses and rows of terraced dwellings. The scheme was designed to meet current energy efficiency standards under Building Regulations Part L and achieve SAP compliance prior to construction.\u003C\u002Fp>\n\u003Cp data-start=\"2296\" data-end=\"2538\">SAP (Standard Assessment Procedure) is the UK government methodology used to assess the energy performance of new homes. It incorporates fabric performance, heating systems, ventilation, and importantly, thermal bridging through PSI values.\u003C\u002Fp>\n\u003Cp data-start=\"2540\" data-end=\"2718\">The developer required PSI value calculations to ensure that thermal bridging was accurately represented in SAP assessments and that all homes would pass compliance first time.\u003C\u002Fp>\n\u003Cp data-start=\"2720\" data-end=\"2990\">ATSPACE was appointed during the technical design stage to provide PSI value calculations and support the SAP submission process. The key objective was to avoid any risk of SAP failure, which could delay Building Control approval and impact the construction programme.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"139icz0\" data-start=\"2992\" data-end=\"3021\">Why the service matters\u003C\u002Fh3>\n\u003Cp data-start=\"3022\" data-end=\"3247\">PSI value calculations are a critical component of SAP assessments under Part L of the Building Regulations. They measure heat loss at junctions where building elements meet, such as walls, floors, roofs, windows and doors.\u003C\u002Fp>\n\u003Cp data-start=\"3249\" data-end=\"3412\">Even when insulation levels are compliant, poor thermal bridging assumptions can negatively impact SAP results and lead to failure in energy performance targets.\u003C\u002Fp>\n\u003Cp data-start=\"3414\" data-end=\"3650\">PSI value calculations ensure that:\u003Cbr data-start=\"3449\" data-end=\"3452\">Thermal bridging is accurately represented in SAP models\u003Cbr data-start=\"3508\" data-end=\"3511\">Heat loss at junctions is correctly quantified\u003Cbr data-start=\"3557\" data-end=\"3560\">Energy efficiency targets are achieved\u003Cbr data-start=\"3598\" data-end=\"3601\">Building Regulations compliance is demonstrated\u003C\u002Fp>\n\u003Cp data-start=\"3652\" data-end=\"3869\">This service is typically required for:\u003Cbr data-start=\"3691\" data-end=\"3694\">New build residential developments\u003Cbr data-start=\"3728\" data-end=\"3731\">SAP submissions for Building Control approval\u003Cbr data-start=\"3776\" data-end=\"3779\">Energy performance compliance reporting\u003Cbr data-start=\"3818\" data-end=\"3821\">Developments using modern insulation standards\u003C\u002Fp>\n\u003Cp data-start=\"3871\" data-end=\"4060\">If PSI values are not correctly calculated or are based on default assumptions, SAP calculations may fail, resulting in redesign, delays, or additional cost to improve fabric performance.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"11s12pg\" data-start=\"4062\" data-end=\"4079\">The problem\u003C\u002Fh3>\n\u003Cp data-start=\"4080\" data-end=\"4256\">When ATSPACE was appointed, SAP modelling had already begun using preliminary design assumptions. However, several issues were identified relating to thermal bridging inputs.\u003C\u002Fp>\n\u003Cp data-start=\"4258\" data-end=\"4586\">Key concerns included:\u003Cbr data-start=\"4280\" data-end=\"4283\">Use of generic PSI values rather than project-specific calculations\u003Cbr data-start=\"4350\" data-end=\"4353\">Unverified junction details in architectural drawings\u003Cbr data-start=\"4406\" data-end=\"4409\">Inconsistent assumptions between SAP assessor and design team\u003Cbr data-start=\"4470\" data-end=\"4473\">Potential overestimation of heat loss at key junctions\u003Cbr data-start=\"4527\" data-end=\"4530\">Risk of SAP failure due to conservative default values\u003C\u002Fp>\n\u003Cp data-start=\"4588\" data-end=\"4710\">The development was also operating under a tight delivery programme, with Building Control submission scheduled shortly.\u003C\u002Fp>\n\u003Cp data-start=\"4712\" data-end=\"4995\">Without accurate PSI value calculations, there was a significant risk that SAP results would not achieve compliance, potentially requiring design changes or delays to approval. The developer needed certainty that the energy model reflected accurate and achievable performance data.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"jlughc\" data-start=\"4997\" data-end=\"5031\">What ATSPACE was asked to do\u003C\u002Fh3>\n\u003Cp data-start=\"5032\" data-end=\"5379\">Carry out project-specific PSI value calculations\u003Cbr data-start=\"5081\" data-end=\"5084\">Provide accurate thermal bridging inputs for SAP modelling\u003Cbr data-start=\"5142\" data-end=\"5145\">Review junction details across all dwelling types\u003Cbr data-start=\"5194\" data-end=\"5197\">Confirm Part L compliance requirements\u003Cbr data-start=\"5235\" data-end=\"5238\">Identify and reduce risk of SAP failure\u003Cbr data-start=\"5277\" data-end=\"5280\">Support Building Control submission process\u003Cbr data-start=\"5323\" data-end=\"5326\">Deliver clear, audit-ready compliance documentation\u003C\u002Fp>\n\u003Ch3 data-section-id=\"bmbyk8\" data-start=\"5381\" data-end=\"5399\">Our approach\u003C\u002Fh3>\n\u003Cp data-start=\"5400\" data-end=\"5684\">Step 1: Understanding the compliance requirement\u003Cbr data-start=\"5448\" data-end=\"5451\">ATSPACE reviewed the SAP modelling approach and confirmed where PSI value calculations were required to replace default thermal bridging assumptions. We defined a structured calculation methodology aligned with Part L requirements.\u003C\u002Fp>\n\u003Cp data-start=\"5686\" data-end=\"6067\">Step 2: Reviewing junction details and construction assumptions\u003Cbr data-start=\"5749\" data-end=\"5752\">We analysed architectural drawings and construction details, focusing on key junctions including wall-to-floor connections, roof-to-wall junctions, window and door reveals, and party wall interfaces. This allowed us to identify where thermal bridging performance could be improved or refined within the SAP model.\u003C\u002Fp>\n\u003Cp data-start=\"6069\" data-end=\"6549\">Step 3: Optimising PSI values for SAP performance\u003Cbr data-start=\"6118\" data-end=\"6121\">Before finalising calculations, ATSPACE provided practical recommendations to improve SAP outcomes, including improving insulation continuity at key junctions, refining window reveal detailing assumptions, reducing thermal bridging at floor slab edges, and aligning construction details across dwelling types. These improvements were incorporated into PSI calculations to support better SAP performance without design changes.\u003C\u002Fp>\n\u003Cp data-start=\"6551\" data-end=\"6811\">Step 4: Clear SAP-ready reporting\u003Cbr data-start=\"6584\" data-end=\"6587\">ATSPACE completed PSI value calculations and delivered structured outputs suitable for direct SAP input. The documentation clearly demonstrated compliance with Part L and supported first time SAP pass across all dwellings.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"176e6rf\" data-start=\"6813\" data-end=\"6862\">Real issues we faced and how we solved them\u003C\u002Fh3>\n\u003Cp data-start=\"6863\" data-end=\"7124\">Issue A: reliance on default PSI values in SAP model\u003Cbr data-start=\"6915\" data-end=\"6918\">The initial SAP assessment used generic thermal bridging values.\u003Cbr data-start=\"6982\" data-end=\"6985\">How ATSPACE helped: We replaced default assumptions with project-specific PSI calculations, improving accuracy and compliance confidence.\u003C\u002Fp>\n\u003Cp data-start=\"7126\" data-end=\"7344\">Issue B: inconsistent junction detailing\u003Cbr data-start=\"7166\" data-end=\"7169\">Different house types had slightly varied construction details.\u003Cbr data-start=\"7232\" data-end=\"7235\">How ATSPACE helped: We standardised PSI calculations across dwelling types to ensure consistent SAP inputs.\u003C\u002Fp>\n\u003Cp data-start=\"7346\" data-end=\"7573\">Issue C: risk of SAP compliance failure\u003Cbr data-start=\"7385\" data-end=\"7388\">Initial modelling results were close to regulatory thresholds.\u003Cbr data-start=\"7450\" data-end=\"7453\">How ATSPACE helped: We refined thermal bridging inputs to improve overall SAP performance without altering the design.\u003C\u002Fp>\n\u003Cp data-start=\"7575\" data-end=\"7803\">Issue D: tight submission deadline\u003Cbr data-start=\"7609\" data-end=\"7612\">The project required fast turnaround for Building Control submission.\u003Cbr data-start=\"7681\" data-end=\"7684\">How ATSPACE helped: We prioritised PSI calculation delivery to align with SAP reporting deadlines and prevent delays.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"1j6c1zw\" data-start=\"7805\" data-end=\"7818\">Results\u003C\u002Fh3>\n\u003Cp data-start=\"7819\" data-end=\"8128\">PSI value calculations completed for all 24 homes\u003Cbr data-start=\"7868\" data-end=\"7871\">SAP compliance achieved first time\u003Cbr data-start=\"7905\" data-end=\"7908\">No redesign required\u003Cbr data-start=\"7928\" data-end=\"7931\">Building Regulations approval supported successfully\u003Cbr data-start=\"7983\" data-end=\"7986\">Thermal bridging inputs fully validated\u003Cbr data-start=\"8025\" data-end=\"8028\">No delay to construction or submission programme\u003Cbr data-start=\"8076\" data-end=\"8079\">Consistent compliance across all dwelling types\u003C\u002Fp>\n\u003Ch3 data-section-id=\"1bmn0eq\" data-start=\"8130\" data-end=\"8160\">What this project proves\u003C\u002Fh3>\n\u003Cp data-start=\"8161\" data-end=\"8306\">This project demonstrates that PSI value calculations play a critical role in achieving successful SAP compliance for residential developments.\u003C\u002Fp>\n\u003Cp data-start=\"8308\" data-end=\"8579\">When completed accurately and early, they ensure that SAP assessments reflect real construction performance, thermal bridging does not negatively impact compliance, Building Regulations approval is achieved first time, and project delays and redesign risks are avoided.\u003C\u002Fp>\n\u003Cp data-start=\"8581\" data-end=\"8738\">PSI value calculations are not just a technical requirement, but a key factor in securing reliable SAP performance outcomes in modern housing developments.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"icdteb\" data-start=\"8740\" data-end=\"8754\">Mini FAQ\u003C\u002Fh3>\n\u003Cp data-start=\"8755\" data-end=\"8905\">What are PSI value calculations in SAP?\u003Cbr data-start=\"8794\" data-end=\"8797\">They are thermal bridging calculations used to determine heat loss at junctions in SAP energy assessments.\u003C\u002Fp>\n\u003Cp data-start=\"8907\" data-end=\"9089\">Why are PSI values important for SAP compliance?\u003Cbr data-start=\"8955\" data-end=\"8958\">Because they directly affect energy performance results and can determine whether a dwelling passes or fails Part L requirements.\u003C\u002Fp>\n\u003Cp data-start=\"9091\" data-end=\"9214\">Do all new homes need PSI value calculations?\u003Cbr data-start=\"9136\" data-end=\"9139\">Yes, most new build homes require PSI values for accurate SAP compliance.\u003C\u002Fp>\n\u003Cp data-start=\"9216\" data-end=\"9356\">What happens if PSI values are not used?\u003Cbr data-start=\"9256\" data-end=\"9259\">SAP calculations may rely on default values, which can reduce accuracy and risk non-compliance.\u003C\u002Fp>\n\u003Cp data-start=\"9358\" data-end=\"9503\">Can PSI values improve SAP results?\u003Cbr data-start=\"9393\" data-end=\"9396\">Yes, accurate PSI calculations often improve energy performance outcomes compared to generic assumptions.\u003C\u002Fp>\n\u003Cp data-start=\"9505\" data-end=\"9643\">When should PSI calculations be completed?\u003Cbr data-start=\"9547\" data-end=\"9550\">They should be completed during the design stage before SAP submission to Building Control.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"gdtiox\" data-start=\"9645\" data-end=\"9665\">Call to action\u003C\u002Fh3>\n\u003Cp data-start=\"9666\" data-end=\"9747\">Need PSI value calculations for SAP compliance on your residential development?\u003C\u002Fp>\n\u003Cp data-start=\"9749\" data-end=\"9990\" data-is-last-node=\"\" data-is-only-node=\"\">ATSPACE helps developers, architects and SAP assessors achieve fast, reliable Part L compliance with accurate thermal bridging calculations and no unnecessary delays. 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