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Guesswork)","smart-htc-test-proving-as-built-heat-loss-on-a-new-build-home-no-guesswork","\u002Fcase-studies\u002Fsmart-htc-test-proving-as-built-heat-loss-on-a-new-build-home-no-guesswork",[44,102],{"name":45,"componentName":46,"cols":47,"colsMD":48,"customColSpan":8,"parentAlign":49,"bgImage":7,"inlineStyles":7,"bgColor":50,"group":51,"margin":7,"padding":7,"classes":52,"colSpan":7,"id":53,"originalModel":54,"borderWidth":94,"borderColor":95,"borderRadius":7,"paddingVertical":96,"blockTemplateId":97,"block_scope":98,"blockLabel":99,"blockDescription":7,"is_block":11,"paddingHorizontalSM":7,"paddingHorizontal":100,"sticky":8,"stickyTop":93,"stickyDisableSmall":8,"borderPosition":101},"Container","ColContainer","grid-cols-1","md:grid-cols-12","w-full","#ebf5f3","main","pattern_bg","f1bcde02-fe0a-4831-8ef7-833d9f4fbb17",[55],[56,62],{"colSpan":57,"colSpanSM":58,"colSpanMD":59,"colSpanLG":60,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"id":61,"borderPosition":7},"col-span-1","sm:col-span-12","md:col-span-12","lg:col-span-12","608d7c62-4a53-4ecd-90e5-9a4d00eaa4ad",{"name":63,"componentName":46,"nested":11,"cols":47,"colsMD":48,"customColSpan":8,"parentAlign":49,"bgImage":7,"inlineStyles":7,"bgColor":7,"group":64,"margin":7,"padding":7,"classes":7,"colSpan":7,"id":65,"originalModel":66,"borderWidth":7,"borderColor":7,"borderRadius":7,"containerWidth":92,"sticky":8,"stickyTop":93,"stickyDisableSmall":8,"borderPosition":7},"Nested Container","main_nested","877549aa-8bc7-474b-8261-ce43bdf39dfd",[67,83],[68,73],{"colSpan":57,"colSpanSM":69,"colSpanMD":70,"colSpanLG":71,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"id":72,"borderPosition":7},"sm:col-span-6","md:col-span-6","lg:col-span-6","f5aab5dd-4d72-423a-87fb-ae305112af49",{"name":74,"componentName":75,"group":76,"margin":7,"padding":7,"classes":7,"bgImage":7,"id":77,"originalModel":78},"WYSIWYG Editor","Wysiwyg","content","ee86e31b-348d-41ae-aea6-b0a20400b9d2",{"proseEnabled":8,"content":79,"lineHeightClass":80,"trackingClass":81,"spacingClass":82},"\u003Ch1 class=\"text-4xl md:text-5xl text-theme-dark-green font-medium mb-10 md:mb-0\" style=\"text-align: left;\">Smart HTC Test: Proving As-Built Heat Loss on a New-Build Home (No Guesswork)\u003C\u002Fh1>","leading-relaxed","tracking-normal","[&_p]:my-0 [&_p+p]:mt-4",[84,86],{"id":85,"colSpan":57,"colSpanSM":69,"colSpanMD":70,"colSpanLG":71,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"borderPosition":7},"517a151c-2154-4782-b41c-3b767f63208b",{"name":87,"componentName":88,"group":76,"margin":7,"padding":7,"classes":7,"bgImage":7,"id":89,"originalModel":90},"HTML Block","HtmlBlock","8817ddf4-0530-4257-a85f-c50e6dae808f",{"html":91,"wrapperClasses":7,"contentClasses":7},"\u003Cdiv class=\"relative flex justify-center md:justify-end\">\n  \u003C!-- wrapper controls overall size -->\n  \u003Cdiv class=\"relative w-full max-w-[560px]\">\n    \u003C!-- Pattern layer -->\n    \u003Cdiv class=\"pattern-bg-case-study absolute -inset-6 rounded-2xl\" aria-hidden=\"true\">\u003C\u002Fdiv>\n\n    \u003C!-- Green slab (offset behind image) -->\n    \u003Cdiv\n      class=\"absolute left-0 top-6 h-[260px] w-[320px] rounded-2xl bg-emerald-500\"\n      aria-hidden=\"true\"\n    >\u003C\u002Fdiv>\n\n    \u003C!-- Image -->\n    \u003Cdiv class=\"relative ml-0 md:ml-10 mt-0 overflow-hidden rounded-2xl\">\n      \u003Cimg\n        src=\"{{feature_image}}\"\n        alt=\"Case study feature\"\n        class=\"block h-[260px] w-full object-cover\"\n      \u002F>\n    \u003C\u002Fdiv>\n  \u003C\u002Fdiv>\n\u003C\u002Fdiv>","max-w-6xl mx-auto",0,"border-2","05871b","py-16",12,"standard","Our Services - Green block with bg pattern","px-7","border-b",{"name":45,"componentName":46,"cols":47,"colsMD":48,"customColSpan":8,"parentAlign":49,"bgImage":7,"inlineStyles":7,"bgColor":7,"group":51,"margin":7,"padding":7,"classes":7,"colSpan":7,"id":103,"originalModel":104,"borderWidth":7,"borderColor":7,"borderRadius":7,"sticky":8,"stickyTop":93,"stickyDisableSmall":8,"paddingVertical":118,"borderPosition":7,"paddingHorizontal":119},"0634e860-5bb2-42de-aa57-b2272d325b7a",[105],[106,108],{"id":107,"colSpan":57,"colSpanSM":58,"colSpanMD":59,"colSpanLG":60,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"borderPosition":7},"769b7f36-06b0-4bcc-9fc7-b1935051d677",{"name":63,"componentName":46,"nested":11,"cols":47,"colsMD":48,"customColSpan":8,"parentAlign":49,"bgImage":7,"inlineStyles":7,"bgColor":7,"group":64,"margin":7,"padding":7,"classes":7,"colSpan":7,"id":109,"originalModel":110,"borderWidth":7,"borderColor":7,"borderRadius":7,"sticky":8,"stickyTop":93,"stickyDisableSmall":8,"containerWidth":92,"borderPosition":7},"e7c2eabd-f877-467a-89f0-aa8ef8b7f411",[111],[112,114],{"id":113,"colSpan":57,"colSpanSM":58,"colSpanMD":59,"colSpanLG":60,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"borderPosition":7},"c37da2da-dc4c-4238-938b-031fe5501f7d",{"name":74,"componentName":75,"group":76,"margin":7,"padding":7,"classes":7,"bgImage":7,"id":115,"originalModel":116},"30243da6-e294-4dbe-9226-f959bbb2a3d8",{"proseEnabled":11,"content":117,"lineHeightClass":80,"trackingClass":81,"spacingClass":82},"\u003Cdiv 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\u003Cdiv class=\"OutlineElement Ltr SCXW37319700 BCX8\">\n\u003Cdiv>\n\u003Ch2>\u003Cstrong>The result\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>A new build home needed \u003Cstrong>proof of real fabric performance\u003C\u002Fstrong>, not just design‑stage assumptions.\u003Cbr>ATSPACE delivered a Smart HTC test to measure the \u003Cstrong>as‑built heat loss rate\u003C\u002Fstrong>, confirming how the home performed under real conditions.\u003C\u002Fp>\n\u003Cp>The result provided clear, practical evidence at handover, reduced performance‑gap risk, and gave the project team confidence that the build quality matched the design intent.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Project snapshot\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Service:\u003C\u002Fstrong> Smart HTC testing\u003Cbr>\u003Cstrong>Client:\u003C\u002Fstrong> Regional housebuilder\u003Cbr>\u003Cstrong>Site:\u003C\u002Fstrong> 8 Alderwood Drive, Wynyard Park, Stockton‑on‑Tees TS22 5QH\u003Cbr>\u003Cstrong>Building type:\u003C\u002Fstrong> 4‑bed detached, two‑storey new build\u003Cbr>\u003Cstrong>Construction:\u003C\u002Fstrong> Masonry cavity walls, insulated slab, warm roof, high‑performance glazing, MVHR\u003Cbr>\u003Cstrong>Programme stage:\u003C\u002Fstrong> Handover readiness, post‑commissioning\u003Cbr>\u003Cstrong>Compliance driver:\u003C\u002Fstrong> Part L expectations + client QA\u003Cbr>\u003Cstrong>ATSPACE delivery:\u003C\u002Fstrong> Smart HTC setup, monitoring, analysis, results summary, close‑out notes\u003Cbr>\u003Cstrong>Team:\u003C\u002Fstrong> ATSPACE building performance engineer + compliance coordinator\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Why the client asked for Smart HTC\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The client had two concerns that typical sign‑off could not fully address:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>They wanted \u003Cstrong>measured confirmation\u003C\u002Fstrong> that on‑site fabric performance matched SAP assumptions.\u003C\u002Fli>\n\u003Cli>They wanted \u003Cstrong>evidence they could show stakeholders\u003C\u002Fstrong> — something stronger than “it should perform well.”\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Smart HTC was chosen because it provides \u003Cstrong>real‑world heat‑loss measurement\u003C\u002Fstrong> rather than theoretical estimates.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What Smart HTC measures (plain English)\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Smart HTC estimates a home’s \u003Cstrong>heat transfer coefficient (HTC)\u003C\u002Fstrong> — the real‑world heat‑loss rate, expressed in Watts per Kelvin.\u003C\u002Fp>\n\u003Cp>In simple terms:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Lower HTC = better heat retention\u003C\u002Fstrong>\u003C\u002Fli>\n\u003Cli>HTC reflects \u003Cem>actual\u003C\u002Fem> fabric + infiltration performance\u003C\u002Fli>\n\u003Cli>It is the clearest way to check whether the delivered home behaves as designed\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Smart HTC does not replace SAP — it \u003Cstrong>verifies the as‑built outcome\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>The risk on this plot\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Although workmanship was strong, this house type included details that often create hidden heat loss:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>slab‑edge + wall‑base junctions\u003C\u002Fli>\n\u003Cli>loft hatch + ceiling penetrations\u003C\u002Fli>\n\u003Cli>service entries at utility\u002Fplant zones\u003C\u002Fli>\n\u003Cli>MVHR duct penetrations\u003C\u002Fli>\n\u003Cli>window\u002Fdoor reveal junctions\u003C\u002Fli>\n\u003Cli>thermal discontinuity at garage interface\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The home looked complete — but the question was: \u003Cstrong>did it perform as designed?\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What ATSPACE did\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Step 1: Confirm readiness and test conditions\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We ensured:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>stable dwelling conditions for monitoring\u003C\u002Fli>\n\u003Cli>commissioning complete, consistent operation possible\u003C\u002Fli>\n\u003Cli>all openings\u002Finterfaces in final state\u003C\u002Fli>\n\u003Cli>site team understood how to manage the building during the test\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>Step 2: Smart HTC test setup + monitoring\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We installed the monitoring setup and captured all required data streams to accurately measure heat‑loss response under controlled heating operation.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 3: Analysis + comparison to design intent\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We compared the measured HTC with the expected design performance and checked for signs of unusual heat‑loss behaviour.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 4: Provide clear actions\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Where relevant, we provided simple close‑out notes for the client so the findings could be applied to future plots of the same type.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What the test showed\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The measured as‑built HTC was \u003Cstrong>in line with design intent\u003C\u002Fstrong>.\u003Cbr>The value wasn’t just the number — it was that it was:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>repeatable\u003C\u002Fli>\n\u003Cli>explainable\u003C\u002Fli>\n\u003Cli>aligned with expected performance\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>\u003Cstrong>Client benefits:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>confidence at handover in real fabric performance\u003C\u002Fli>\n\u003Cli>proof that build‑quality controls were effective\u003C\u002Fli>\n\u003Cli>reduced risk of occupant comfort complaints\u003C\u002Fli>\n\u003Cli>benchmark data to compare future phases\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>What this proved on site\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>1. Heat‑loss risk is driven by junctions, not big elements\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Thermal bypass often happens at slab edges, service entries and loft interfaces — not main walls\u002Froof.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>2. Commissioning + close‑out protect fabric performance\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Poorly sealed penetrations during late works can undermine a good design.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>3. Measured evidence transforms handover\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Data removes debate and vague assumptions.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>4. One strong result supports dozens of future plots\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>The Smart HTC result becomes a benchmark for consistency.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Common mistakes this project avoided\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>assuming SAP values reflect real‑world construction\u003C\u002Fli>\n\u003Cli>leaving service‑entry sealing until late snagging\u003C\u002Fli>\n\u003Cli>using visual completion as a proxy for performance\u003C\u002Fli>\n\u003Cli>handing over without measured fabric evidence\u003C\u002Fli>\n\u003Cli>discovering performance issues only after occupation\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>CTA\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>If you want proof that your new build homes are performing as built, ATSPACE Smart HTC testing provides \u003Cstrong>measured evidence of heat‑loss performance\u003C\u002Fstrong> at handover.\u003Cbr>It supports QA, reduces performance‑gap risk and provides clarity for clients and stakeholders.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Ask for:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Smart HTC testing + reporting for handover\u003C\u002Fli>\n\u003Cli>staged fabric‑performance checks for repeat house types\u003C\u002Fli>\n\u003Cli>diagnostic support when heat‑loss results are off‑target\u003C\u002Fli>\n\u003Cli>practical close‑out notes to protect performance across a site\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Frequently asked questions\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>What does Smart HTC stand for?\u003C\u002Fstrong>\u003Cbr>A measured method of estimating the \u003Cstrong>heat transfer coefficient\u003C\u002Fstrong> — the as‑built heat‑loss rate.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Is Smart HTC required for Part L?\u003C\u002Fstrong>\u003Cbr>Not usually, but it provides strong supporting evidence for fabric performance and reduces performance‑gap risk.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>When should Smart HTC be carried out?\u003C\u002Fstrong>\u003Cbr>At handover readiness — when the dwelling is complete and stable enough for controlled monitoring.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>What causes poor Smart HTC results?\u003C\u002Fstrong>\u003Cbr>Typical causes include:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>uncontrolled air leakage\u003C\u002Fli>\n\u003Cli>weak junction detailing\u003C\u002Fli>\n\u003Cli>thermal bypass\u003C\u002Fli>\n\u003Cli>poorly sealed service penetrations\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fdiv>\n\u003C\u002Fdiv>\n\u003Cdiv class=\"OutlineElement Ltr SCXW37319700 BCX8\">\n\u003Cp class=\"Paragraph SCXW37319700 BCX8\" paraid=\"1271522189\" paraeid=\"{33894645-f269-48a8-83b0-7b97de420487}{236}\">\u003Cspan class=\"NormalTextRun SCXW37319700 BCX8\">\u003C\u002Fspan>\u003Cspan class=\"EOP SCXW37319700 BCX8\" 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