1 “. A lot of foreclosure attorneys will set a flat monthly fee that can cost anywhere from $300 to $600 per month. 2  Some foreclosure attorneys may even offer flat-fee packages that can cost anywhere from $1,500 to $5,000 for the year. To get a detailed price on basic lawyer fees, see “ How much do lawyers cost? “. 2  A lot of foreclosure attorneys will set a flat monthly fee that can cost anywhere from $300 to $600 per month. 3  Some foreclosure attorneys may even offer flat-fee packages that can cost anywhere from $1,500 to $5,000 for the year.