I would like to ask if is it legal to put someone content on own website (content will be changed to match my own design) without asking the owner of that site for permission. I would like to get some properties available in my area to display on my website from external sources to help people find something to rent/buy in that area. Can I do it without getting agreement with that site?
Can I use others' content on my own website without their permission?
copyright
No, you can't. Property details and photographs are copyrighted, and no one other than the creator can use them without permission. If you just want to use factual data -- asking price, number of bedrooms, etc. -- then it's more of a grey area, and you might be able to get away with it.