VIDEOClick to see full answer. Herein, how much does it cost to put a window in a wall? Average Cost to Install a Window in an Existing Wall While you can expect to spend anywhere from $1,000 to $5,000+ per window, no two projects are the same. This type of work requires a combination of framing, siding, finishing work and sometimes electrical and plumbing rerouting.Subsequently, question is, how many bricks can you safely remove from a wall? One further point to note is that you should never remove more than 2 bricks at once. If you have quite a few to do, replace 2 and leave them to cure correctly for at least a week before tackling any more. Consequently, how do you brick around a window? Lay bricks to about 12 inches from the bottom of the window. Install a steel lintel above the window with installation bolts to support the weight of the bricks over the open space of the window. Install metal flashing over the top of the lintel to prevent water from entering between the bricks. How do you measure a window for bricks?For metal windows in brick walls, measure the width from brick to brick. Measure the height of metal windows from the brick at the bottom to the lintel at the top. Measure the height of metal windows from the brick at the bottom to the lintel at the top. Note: The brick opening may be larger than the window opening.