Welcome to the Q&A Forum

Wow - thanks for your quick response.

The new domain is www.screenco.com.au and the old one is www.screenco.net.au

Just for reference - these are the "SEO expert's" actual words: "leave it there and run both sites, putting a 301 redirect will harm the site in the long run. 301 redirects from other domains are now believed to be bad links – from the same domain they are considered ok, as they are redirecting pages that are now not  working or temporary created by php or similar".

So do I take it he either a) is confused between a temporary and permanent redirection, or b)just doesn't want to spend half an hour doing the actual redirections?

After years using a .net.au site, my client has purchased the .com.au version of the same domain. I've now set up a new, responsive website using a wordpress template with new content, but used a similar page structure.

I've asked their web developer to now do a 301 permanent redirect on each old page from .net.au site to it's new .com.au page, but he has refused, saying it would be bad for long term SEO. Instead, he says they should run both sites (which I thought would cause duplicate content issues).

Both domains are hosted with the same company.

I thought as long as the 301 redirects were done on a page by page basis, there were no issues? I'm no SEO expert, (which he claims to be), so I just wanted to get another opinion on what best practice would be in this instance.