On Tue, 04 Jan 2011 12:34:01 +0000 David J wrote :
What I would like to know is why this 'calculation' is a secret, only
available to those who have paid about £2k for a course that includes
the required software used. I realise that the various factors need
loading, but that should not be too difficult to manage.

Should not this piece of compulsory information be in the public
domain? If you can work out your own income tax, what is so special
about energy efficiency?

The methodology is in the public domain at
http://projects.bre.co.uk/sap2005/

The key issue is that EPCs can only be issued by accredited assessors,
and to be an assessor you need to be signed up in one of the schemes ...
which, as you've realised, doesn't come cheap.

--
Tony Bryer, Greentram: 'Software to build on' Melbourne, Australia
www.superbeam.co.uk www.eurobeam.co.uk www.greentram.com