About 20 years in Seattle my neighbor built a fence from the middle of the side yard to the back. By building his half-fence, he blocked me from using his driveway, which was the only way to get my utility trailer into my back yard. I had done that once. Fortunately the trailer was not there when the fence went up.
The fence builders showed up one day and started digging on the property line. I had no idea it was coming and chased them off. They came back the next day and did the job on his side of the line. Some time later I built my own fence on the front half of that side on my side of the line, so the completed fence had a one-foot jog in the middle. It was not a matter of communication or cooperation - there was none.