Guys (and gals

) please help me out here
I have an 8 month old lab/husky mix.. I got him when he was 2 mnths old.. The problem was that I was off college at the time, and my mum had her summer holidays (teacher), so he was with someone almost all the time.. he very rarely was left alone..
now we re trying to leave him alone.. at 1st he would destroy stuff but now we just clear things up and its not a problem at all.. the problem is the barking.. he doesnt stop barking and the neighbours have complained.. i ve tried leaving him for an hour at a go for 2 weeks but he did not improve
i read up and i think its separation anxiety.. however I have tried leaving him for 1min, 2mins, 5mins, etc... he always ends up barking.. should i then open for him? please help me everything is going well otherwise, but if he keeps barking like this every time he s left alone for 5mins, he ll annoy the neighbours so much
tnx in advance, hope u have some suggestions