Consider the benefits
Allowing term-time holidays can make job offers more attractive, and help you recruit and retain staff (particularly if other local schools/trusts don't offer this).
It can also give staff the chance to go on holidays at times when the costs are lower, and help to develop a sense of staff belonging within your school/trust.
If you do decide to offer this option, make sure the arrangements balance the needs of your school/trust with your support staff's wellbeing.
Identify which staff this could work for
To what degree would their absence during term time adversely affect pupils' learning? Would other school/trust operations still function effectively during term time with the person on leave? How many days' leave during term time in total (e.g. 10 in a calendar year) or in one block (e.g. up to 5 days) would be possible? Who