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Generating your H1 report ​

When your elements are in, the assemblies are assigned, and the details are filled, click Generate H1 compliance report. Thermly renders a PDF you can review, save and attach to a building-consent application.

Before you generate ​

  • Every element has an area and an assembly.
  • The climate zone is set.
  • Project Information and Prepared by are complete (blank fields print as "Not specified").
  • The Heat-loss check footer shows your current verdict and headroom.

You can generate at any status. Draft and In Review reports carry a preview watermark; Submitted and Approved reports print without it.

What the report contains ​

The PDF is a complete H1/AS1 6th edition Calculation Method submission:

  • Headline result - proposed vs reference building heat loss, and the PASS / FAIL verdict.
  • Compliance checks - the glazing cap (§2.1.2.5) and the minimum construction R-values (§2.1.2.11), each shown pass or fail.
  • Construction schedule - every element, its area, assembly and construction R-value, with the clause basis for each figure.
  • Construction build-ups - the layer-by-layer R-value decomposition for each structured assembly, so a reviewer can follow the arithmetic.
  • Required disclosures - an always-on strip of data-quality and method notes (framing fraction assumed, supplied or externally-determined values, plausibility flags). These never affect the verdict; they tell the reviewer what to check.
  • Insulation plans - your marked-up plan diagrams.
  • Assumptions, validation warnings (where any downlight derate shows its working), references and sources, and the declaration - each of these sections can be toggled in Settings → Report.
  • Designer / reviewer declaration - see below.

The declaration block ​

The report ends with a declaration for the people responsible for it. This is the heart of the professional-tool relationship: Thermly does the calculation and produces the document; a named professional confirms the inputs and reviews the result.

The declaration states, in substance:

"I confirm that the inputs used in this report reflect the selected project construction assemblies and product specifications at the time of calculation. This report has been prepared using the applicable standard and calculation method and does not constitute a certificate of compliance, council approval, or producer statement."

It carries Prepared by, Organisation, Role and Date; a Review and approval section (Status, Reviewed by, Review date, and approval when the project is Approved); signature lines for preparer and reviewer; and a revision-history table.

The report is your calculation and documentation, presented for a professional to certify. It is not itself a compliance certificate. See Can I use the report for consent submission?

Open-testing notice ​

While Thermly is in its public open-testing phase, a notice may appear on the H1 page and on every generated report ("Thermly is in open access testing · Verify all results. Do not rely on them for compliance."). It is on during open testing and off at launch.

Revising and re-generating ​

Change anything - an area, a product, a detail - and re-generate; the report reflects the current state. Move the project through In Review and Submitted to Approved to freeze it (see Setting up a project).

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