Yes, if you own an unencumbered property and wish to remortgage, you can take out borrowing. Lenders will want to know:
What the remortgage is for - e.g. to purchase a buy-to-let property, to invest in shares, to cover a financial cost or to renovate the home.
Your income, used for affordability calculations.
Any other debts in place such as loans, mortgages and credit cards.
Whether you have any bad credit issues, including bankruptcies, CCJs, IVAs or arrears.
Online calculators can be useful, but only look at the monetary figures, so are not a reliable indicator as to whether a lender would be able to accept your application on eligibility terms.
It is, therefore, crucial to consult with a mortgage expert to ensure you proceed with the right lender.