The completion fee of £800 has been removed and a free standard valuation up to £335 added.
The society is also offering free legal services for standard re-mortgages.
These new deals are the lowest rates currently available in the market on a fees assisted basis.
Kim Rebecchi, Leeds sales and marketing director, said: "We are delighted to get 2013 off to a great start by converting our 2-year fixed rate's into a New Year sale mortgage range, which offer the lowest rates in the market on a fees assisted basis.
"The removal of the £800 completion fee and the addition of a free standard valuation up to £335, on rates beginning at only 2.54%, mean it really will be a Happy New Year.
"The opportunity to minimise the cost of the biggest monthly outgoing will be welcomed and this sale product provides this. These fees assisted products are ideal for purchases and remortgages alike."
The society's 2-year fixed rate products are available at current rates of 2.54% up to 75% LTV, at 2.94% up to 80% LTV and at 3.54% up to 85% LTV. All tiers of the product allow 10% capital repayments each year without penalty, have no higher lending charge and a booking fee of only £199.
