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I dont think you can do a G change of address for sub-domains.

There are many reasons to host your own WordPress blog versus using WordPress.com, including: You control and own the content You have complete design and layout control You are creating content for your site versus the WordPress.com site This is a helpful article with good reasons for hosting your own blog: 6 Reasons To Host Your Own Blog. But you're on an SEO site, so I'll address the most important reason to host your own blog: SEO.  Blogs, as you know, are powerful SEO tools, especially self-hosted WordPress blogs with SEO-friendly skins such as Thesis. I've helped many clients achieve top 10 and even #1 rankings for targeted keyword phrases simply through their keyword-optimized blog posts. This is why it's important to have the blog on your domain: that way you're driving traffic to YOUR site (where it can be converted to leads or customers) versus the WordPress.com site where you'd be driving traffic to Wordpress.com and people would have to make an extra click just to get to your domain. That is why I advise all my clients to use self-hosted blogs for best SEO lead generation results and encourage you to strongly consider doing so as well. I hope that helps!