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Generating your H1 report ​

When your elements are in, the assemblies are assigned, and the details are filled, click Make Report, at the right-hand end of the report bar at the foot of the H1 page. Thermly saves the project first automatically - the report always reflects a saved version, and the revision history stays in step - then renders a PDF you can review and attach to a building-consent application.

Before you generate ​

  • Every element has an area and an assembly, and every window, door and skylight has a size. A build-up with an unset product slot, or an opening placed on the plan with no size yet, is flagged on its row.
  • The climate zone is set.
  • Project Information is complete (blank fields print as "Not specified"), and your Profile settings carry the author name and organisation the report is attributed to.
  • The report bar shows your current Heat-loss check verdict and headroom. If Make Report is disabled, the bar says what to add to enable it, and the button's tooltip lists everything still needed.
  • Optionally, run AI Review from the report bar - a free pre-flight that lists gaps, compliance blockers and risks to look at before you generate, each with a clause pointer to verify against. See Reading the H1 report.

You can generate at any status. Draft and In Review reports carry a "PREVIEW - NOT FOR CONSENT" watermark; Submitted and Approved reports print without it.

What you are asked before the PDF is produced ​

  • Pre-release terms. While Thermly is in open testing, generating any report first shows a short acknowledgement - outputs may be incorrect, verify independently, not the sole basis for a compliance decision - with a link to the full Terms of Use and a tick box to accept before the PDF is produced.
  • A report credit, the first time. Where payments are switched on, a project's first consent-ready report (one without the preview watermark) spends one report credit, and Thermly asks before it does: the dialog shows your balance, or your organisation's, and offers a watermarked preview instead. Every later report for that project is free and never asks. Building and editing projects, watermarked previews, reports from the sample projects and the insulation take-off never spend a credit. See What does Thermly cost?
  • The same building. Re-generating a consent-ready report for the same building is always fine. If the site address has changed since the report was finalised, Thermly shows the old and new address and asks you to confirm it is still the same building and consent before proceeding. A finalised report is for one building; it is not a template for the next.

What the report contains ​

The PDF is a complete H1/AS1 6th edition Calculation Method submission. Sections flow continuously, in this order. The masthead carries the project name, its save version and workflow status, and the footer records the Thermly version that generated it:

  • Compliance result - proposed vs reference building heat loss, and the PASS / FAIL verdict, with the climate zone named alongside its regions.
  • Existing building fabric - Building Act s 112 - only on an alteration or addition, and then always: the basis relied on, the existing elements excluded as unchanged, the glazing cap on both permitted bases, and the altered fabric before and after.
  • Compliance checks - the glazing cap (§2.1.2.5), the minimum construction R-values (§2.1.2.11) and the heated-element minimums (§2.1.2.12), each shown pass, fail or N/A with its basis, and the solar heat gains line (§2.3.1.1), which the Acceptable Solution deems satisfied by complying with Section 2.1.
  • Schedule of building elements - each wall, roof and floor by its tag and name (WA1, RO1, FL1 …), with its area, assembly and construction R-value and the clause basis for each figure, first as one table and then grouped by element; openings are tagged by their element (WA1-W2 is window W2 on wall WA1, with your own plan tag carried through), so a reviewer goes straight from the schedule to the drawings. The project details printed with it state two floor areas: the conditioned floor across the whole building, and the thermal envelope floor that enters the heat-loss calculation.
  • Construction R-value build-up - the layer-by-layer R-value decomposition for each structured assembly, so a reviewer can follow the arithmetic. Each card prints a colour bar matching the element's plan colour, and each framed layer declares its framing fraction and the basis it came from (declared geometry, the 38% default, a framing take-off, or a recorded demonstration quoted verbatim) - where an air gap or continuous insulation was folded into the layer, or insulation carries on over a part-depth member, the exact equation the engine evaluated is printed, so the stated inputs reproduce the stated R.
  • Critical review items - printed only when there is something in it, and reserved for findings that block reliance on the report: a construction below a §2.1.2.11 minimum, which no heat-loss surplus can trade away, and a construction whose claimed R-value exceeds what its own layer build-up supports. A report with neither has no such section.
  • Insulation plans - your marked-up plan diagrams, each under a subheader naming the plan (Roof plan, Wall plan …) and, where the drawing's title block gives them, the sheet it was drawn on ("Insulation extents shown on first floor plan (sheet A1.2, plan page 3)."). An uploaded marked-up image prints with a small colour key beneath it (swatch, tag and name per element), so a plan coloured in another product can be decoded without opening Thermly.
  • References & sources - the methodology standards, then the supporting documents behind every figure. Each supporting document is labelled with the class of document it is - manufacturer datasheet, manufacturer technical manual, supplier technical statement, BRANZ appraisal, product certificate, published table - so a reviewer can weigh a manufacturer's own document against an independent one. Entries print their full URL and the date Thermly retrieved them (the report is read on paper, where a link target is invisible), each document names its real publisher, and every value traces to a standards table or a manufacturer document.
  • Designer / reviewer declaration - see below.

Five sections are yours to switch on or off, per account, under Settings → Report: References & sources and the Designer / reviewer declaration print by default; Assumptions & hard-rule checks, Review items and Revision history (the project's save-version chain) are off until you switch them on.

Review items is where the cautions go: method cautions, plausibility checks, supplied values with no stated basis, sub-38% framing without a recorded demonstration, a downlight derate's working, a construction below the Clause E3 internal-moisture minimums. It is off by default on purpose. Those cautions are shown to you on the H1 page and in AI Review, where you can act on them; the report keeps to the compliance result and checks unless you choose to include them.

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 (from your profile, or the per-report author override); a Review and approval section (Status, Reviewed by, Review date, and approval when the project is Approved - on a draft this shows a greyed "Completed at sign-off" placeholder); and signature lines for preparer and reviewer.

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 ​

While Thermly is in its public open-testing phase, a banner appears on the H1 page and the pre-release terms acknowledgement fronts report generation. The generated report itself is clean - no testing notice prints on it - so a report you are satisfied with can be submitted as-is. Both the banner and the acknowledgement retire at full launch.

Revising and re-generating ​

While a project is a Draft or In Review, change anything - an area, a product, a detail - and re-generate; the report reflects the current state.

A published report is a document of record. Once a project is Submitted or Approved, the first report generated is frozen: generating it again returns that same document, whatever has happened to the product catalogue or the library since, so the PDF in your records and the one Thermly holds cannot drift apart. The project is also locked against edits at those statuses. To change a published report, withdraw the project to Draft, make and save your edits, and submit it again; that retires the old document and captures a new one, with the next version on its cover. The version on the cover belongs to the content it is printed on: a report whose content does not match a saved version says "Unsaved" there instead of a number.

See Setting up a project for the statuses.

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