WARM Certification Quote Request Form (DOC)

(Version 1.0.5)

If you would like a quote for Passivhaus certification of a residential project please fill out this form and return it to us, together with the drawings of the project.

Evidence Checklist (XLSX)

(Version 1.0.6)

Certification checklist for use during design stage. Note that this lists typical requirements only, and the evidence required on each project varies according to construction type, size, junctions and products used.

Site Checklist and Site Supervisor Declaration (PDF)

(Version 0.3)

Certification checklist for use during construction stage. Also, declaration to be signed by site supervisor.

Glazing Frame Evidence Required for Passivhaus (PDF)

(Version 2)

Glazing and frame evidence required for certification of Passivhaus buildings. Window suppliers, please upload the requested reports to your website for download.

Glazing Frame Specifications for Passivhaus (XLS)

Sheet for window manufacturers to provide glazing and frame specifications. Also denotes the evidence requirements for these specifications.

Passivhaus certification thermal bridge decision tree

Who passes judgement on how thermal bridges are treated, and how? How are suitable thermal bridge Psi-/Chi-values determined? Are there any catalogues of such values? This document helps designers with these questions.

Design PH Guidance

Guidance on how to present the designPH model as part of a building certification.


PHPP WARM Results Sheet (XLSM)

(Version 7.0.8)

A graphical results sheet that can be added to any v9 or v10 PHPP.

Note: the section where the U-value calculations can be displayed is not functioning. Otherwise, this version is believed to be functioning well.

Additional shading sheet (XLSX)

(Version 4.2.3)

An add-in sheet for PHPP 9 and 10, which allows you to easily model shading objects that are discontinuous and/or which have transparency. These include trees, tower blocks, brise-soleils, juliet balconies and plant-on glazing bars.

WARM U-Value Corrections Calculator (XLSX)

(Version 1.0.3)

Calculates corrections for:

  • insulation moisture uptake in inverted roofs
  • screws passing through the insulation layer
    NB: only for screws. NOT suitable for other fixing types/brackets/penetrations.
  • AAC conductivity when used below DPC. Also corrects for moisture uptake and for mortar fraction.

PHPP Analysis - Compare Two PHPPs (XLSX)

(Version 2.0.4)

A tool for comparing the outputs of different PHPP sheets that are both open. V8 and V9 now supported.

Window Comparison Sheet (XLSX)

(Version 1.1)

An add-in sheet for the PHPP. When you are comparing the impact on your PHPP of windows/doors from different manufacturers, use this sheet to save you from copying and pasting new specifications into the Components sheet every time you wish to switch to a different window manufacturer. Simply use the drop-down box in this sheet instead.

How to Enter Multiple Compact Units in One PHPP (PDF)

(Version 2)

Shows you how to enter multiple compact units in one PHPP.

Ducted hot water heat pump cold duct TB calculator (XLSX)

(Version 0.0.4 (Beta))

Calculates Psi-values for the intake and exhaust ducts to hot water heat pumps.

Note: this release is for testing purposes only.


Shape Tool (XLS)

(Version 0.7)

Use this tool at very early design stage to tell you the approx. U-values you will need for floor/wall/roof. The Shape Tool doesn't reflect the changes in internal gains within calculations on PHPP9, but is still generally applicable.


Ventilation Commissioning Guidance and Design/Commissioning Worksheet (ZIP)

As Sally's presentation at the PHI conference 2106: An Updated Final Protocol Worksheet and Commissioning Instructions. These are based on the difficulties we have found with ventilation systems in the the UK, and make specific suggestions about how the commissioning process should be carried out, including:

  • the ability to declare the system "un-commissionable" if noise and airflow measurements cannot find acceptable values
  • the list of suitable types of anemometers for various measurements
  • Noise estimation for high background noise sites.
  • Testing where duct leakage needs to be established.

Intake Location Calculation (XLSX)

(Version 0.3)

On many projects we need to decide how close we can locate an air intake to a polluting exhaust or boiler flue. This workbook is for calculating the minimum recommended distances between intake and exhaust openings and boiler flues using the equation provided in Annex A of BS EN 13779: "Ventilation for non-residential buildings - Performance requirements for ventilation and room-conditioning systems". Note that this calculation does not take into account directional louvres.


Additional Files Used to Set Up THERM (ZIP)

(Version 2)


  • Boundary library 2.4
  • Material library 2.5
  • Initial THERM file for setup
  • Setup file to produce report from THERM

Psi from THERM Calculator (XLSX)

(Version 47)

Excel workbook that derives a Psi-value when you paste in reports from THERM.

THERM Quick Reference Sheet (PDF)

THERM quick reference sheet (covers THERM and the WARM Psi from THERM sheet).


Buying an Eco-House? (PDF)

What to ask for if you are thinking about buying a eco/green/low energy building.

Housing Association Air Test Report (PDF)

Report on housing association existing stock, showing air tightness before and after installation of external insulation.

Coheating Testing Info (PDF)

A brief overview of coheating - what, why and how.