By Brian O’Connell Locking in a fixed mortgage price early has its benefits – and its costs. Homebuyers who want to land a solid mortgage during their purchasing process, but who are wary of fast-moving loan interest rates, may want to stabilize the scene with an extended mortgage rate lock. “A mortgage rate lock allows buyers to lock in a rate, ensuring that it won’t change between the time one applies for a mortgage and closes on their home,” said T.J. Williams, regional vice-president at New York City-based Wealth Enhancement Group. Most lenders offer a built-in 30-or-60-day rate lock which…