Hello Dawn
Welcome to Poms in Oz.
What is your country of residence, please? You have said Portsmouth, but do you mean Portsmouth in the UK? I ask because if you are resident in the UK then whether Hubby is a Carpenter or a Carpenter & Joiner, his skills will need to be assessed by VETASSESS, not by TRA. The rule changes that might or might not happen on 1st September affect only the tradies who have to have their skills assessed by TRA.
Therefore if you are from Eire, USA, Canada or similar you will be affected by the new TRA rules. However if Hubby's skills assessment will have to be done by VETASSESS, he will not need any formal qualifications in any case.
Please see the following links:
Carpenter 4411-13 - Australian Skills Recognition Information
Carpenter and Joiner 4411-11 - Australian Skills Recognition Information
If he will still have to go through TRA, then it looks like it is going to be highly unlikely that it will be possible to do that without formal qualifications of some sort:
Go Matilda - Your Gateway to Australia - News
Best wishes
Gill