Capital gains tax on property

I purchased a property in May 2005 and lived in it as my main residence. I bought a new property and started letting the original property out from 2012 to October 2024. Can you please advise if I can claim back a percentage against my capital gains tax on property? Thanks

Hi,
Yes. You can claim private residence relief for the period that the property was your main residence.  
Please have a look at the guidance at helpsheet HS283. 
HS283 Private Residence Relief (2024)
There is a calculator below, which also has a link to the online capital gains service, so that you can report any gain and pay the tax due, withing the 60 day period.
Tax when you sell property
Thank you.