The direct-only deal is fixed until 30 June 2021 and has a booking fee of £199 and a completion fee of £800 on loans up to £500,000.
Tapered early repayment charges apply of 6% for the first two years, 5% in years three to six, 4% for the next two years, and 3% and 2% in the final two years respectively.
There is no higher lending charge and borrowers will be able to make 10% capital repayments each year without penalty.
Kim Rebecchi, sales and marketing director at Leeds Building Society, said: “This is the only ten-year product available with just a 20% deposit. The product is also fully portable should a borrower move home, providing further flexibility.”