Will we pay capital gains tax?

We have two properties but would like to sell. Will we have to pay capital gains on the sold property?

Yes, you will be liable for this tax. One of your buildings will be your principal private residence (PPR) and when this is sold you do not usually pay tax on any profit. A second property, be it a holiday home or an investment house, will be subject to capital gains tax and possibly income tax on any trading activity. If you are in any doubt you should talk to your accountant.