On (date) we were advised that a change was being considered by the owner in (describe the area in the building or on-site --- be as exact as possible).
We have advised our subcontractors to delay (or stop) works in the area under consideration, as of this date. If further direction on how to preceed with the changes not received by (date), we can either commence work in the designated area or continue the "stop work" order, which may result in a delay to the project.
Please provide us with your decision in this matter.
On (date) we were advised by (owner, architect/engineer) that design changes were being prepared for(describe the area). Upon receipt of information from the (architect or engineer), we will prepare a proposed change order for the work in a lump sum amount for your review. Any changes in the contract completion time will also be included.