CGT is tax on gains in value, so you can only owe CGT if it's worth more when you sell it than when you bought it... if it's your Principal Private Residence, and has been for the entire period* you owned it, then you are exempt from any CGT liability anyway.
Your issue, as Smeharg has pointed out, is that any CAT exemption you received when you inherited, may be dependent on you not selling the property for at least 6 years. You need to get proper advice before acting - I would recommend an accountant / tax consultant rather than a solicitor, a couple of hundred quid for good advice here could pay for itself many times over.