Duplicate page titles reported on same links

[ElykInnovation]

Moz is reporting duplicate titles on my clients website, citing different versions of the same link, one without dubs as domain.com/link and the other with dubs as www.domain.com/link.

for example ...

duplicate title = Warranty Requests For Custom New Home Construction in Jacksonville
http://myhjhome.com/new-home-construction-warranty-request.html
http://www.myhjhome.com/new-home-construction-warranty-request.htmlthe links are the same, one is just with www and the other is without.

in another example ...

Moz reports 5 duplicate titles on the Home page, citing 5 different URLs that all load the same home page ...
duplicate title = Jacksonville Custom Home Builder, Quality Construction On Your Lot
http://myhjhome.com
http://myhjhome.com/
http://myhjhome.com/index.php
http://www.myhjhome.com/
http://www.myhjhome.com/index.php

is this just something that's always going to be reported as a duplicate title or is there a way for me to change the website so Moz doesnt report a duplicate title on the same page (since there really isnt a duplicate title in these examples)?

[ElykInnovation]

thanks for the help!

i've figured out how to setup 301 redirects from within the hosting account

and I'm setting the preferred domain in Google Webmaster Tools like ya mentioned

[MikeRoberts]

Yep... www.example.com, example.com, example.com/index.php, www.example.com/index.php can all be seen as separate pages if not handled correctly. Essentially you need to determine whether the WWW or Non-WWW version of your pages are your preferred and what your preferred version of the homepage is (slash, no slash, /index, etc. etc.). Then go into Webmaster Tools and set either WWW or Non as your preferred and set up 301s on your site to redirect anyone from the non-prefered to the preferred versions.