I work with ND teens/young adults. Issues such as this usually related to control struggles and issues with change. Needing a particular “safe space” to be the same all the time also can signify a lack of internal safety, or ways of coping with the anxiety that a change can bring. The instinct, therefore, is to do as much as possible to avoid a change happening.
Things that can promote internal safety include learning anxiety management techniques - grounding, grounding/soothing objects and stims, breathing, reducing sensory input (using loop earplugs or noise cancelling headphones to minimise the noise from vacuuming etc), engaging in a special interest can also soothe the nervous system.
I engage in change planning with patients, talking about what the change is, what feelings it’s bringing up, involving patients in strategising how to cope with a change. Usually I’d suggest a change is introduced incrementally using a version of a graded exposure type approach, but of course this isn’t always possible for practical reasons.
FWIW I’m seeing lots of these issues appearing because of the rebound from
Covid, for many ASD kids/teens Covid kept things unnaturally stable and reduced the need to adapt to change on a daily basis. Now things are going “back to normal” it’s increased the demands and for many autistic young people their window of tolerance for change and anxiety is much smaller than it was.