Really Useful Software for Architects

Free Downloads

To download the selected evaluation software, click the appropriate link below and choose "Save this program to disk".  Please click here to read the instructions for downloading and installing the software. Please contact RUSFA if there are problems with the download or installation.

sap126.zip (13.11.14)  Sapper version 12.01   BRE approved SAP calculator for SAP 2012 worksheet 9.92. Includes Dewpoint U-value calculator with condensation prediction.

sap916.zip (20.11.14)  Sapper version 9.03.0   SAP calculator for SAP 2009 worksheet 9.9. Includes Dewpoint U-value calculator with condensation prediction.

dew31.zip (09.01.13)  Dewpoint version 3.01   U-value calculator and condensation assessment using the "combined method" (BS EN ISO 6946) as required by new Part L1

rads11.zip (02.01.2009)  Rads (basic version)   Room by room heat loss calculator (up to 20 rooms) including "Boilerbrowser"for easy access to the government's boiler database

rads21.zip (08.06.2011)  Rads (professional version)   Room by room heat loss calculator (up to 20 rooms) including "Dewpoint"  U-value calculator and "Boilerbrowser"for easy access to the government's boiler database

PV1.zip (14.02.10)  Photovoltaics version 1  Photovoltaic energy calculator;

wind81.zip (15.02.10)  Windpower version 1  Wind energy calculator;

Aco21.zip (01.09.07)  Acoustics version 1  sound absorption and reverberation time calculator.

stairs2.zip (08.03.13)  Stairs version 2  Calculates treads, risers and pitch of stairs to comply with Part K

WaterCalc916.zip (18.11.14)  WaterCalc version 1  Water efficiency calculator;

If you have any queries or comments on the programs, please complete the contact form


The evaluation versions of the software are identical to the full version except that they are partially disabled (What do you expect for free!). Most features work exactly as in the full working version.

If you like the software and you would like to convert to the full version, your 6 digit code will be given to you on receipt of an order form and cheque.

Click here to download an order form

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