Yes, you can remortgage and use some of the equity as a down payment for the next buy to let. Property investors often use this technique to expand their holdings.
The lender will hire a valuer to officially calculate the current value of your existing home, allowing you to know precisely how much equity you have. This valuation will be charged to you, but some lenders offer free valuations.
You may also ask your current lender for a further advance. The lender may ask that they carry out a new valuation at that time just to ensure the value you have given on the application is correct.
Speak with our buy-to-let specialists who will be able to assist you in determining which path makes the most financial sense.