The One-Sentence Policy for Working from Home | ProEdit
If you need a longer policy than this, you probably have larger problems in your organization. This really does cover it for most knowledge work.
If employees complete their work on time, and if they do a quality job, then location shouldn’t matter.
There is a big difference between “going to work” and “getting to work.” Of the two, only “getting to work” creates value. Managers should focus on improving the quality of the work and the efficiency of completion, rather than juggling the logistics of employee location.