The environment, and assistive technologies as part of this, can play an important role in supporting the participation and wellbeing of people living with dementia. If not considered, environments can be overwhelming and disempowering. Disability approaches including environmental considerations and assistive technology were often not offered routinely with people living with dementia. Concerned by this, dementia advocates aimed to create change in this area. The Environmental Design-Special Interest Group (ED-SiG) of Dementia Alliance International was developed as an international consumer-driven community of practice bringing together people with different relevant expertise including living experience (people living with dementia, care partners), architecture and design, occupational therapy, rehabilitation and care provision. This practice opinion piece provides an overview of dementia, the need for collaborative practices within practice with people living with dementia, and the considerations of assistive technology, environmental design and the global context. The reflection provides insights into this international community of practice, with personal reflections of members with living experience of dementia, and benefits and opportunities in considering environmental design and assistive technology from the perspectives of members. This work demonstrates and advocates collaborations that centre the perspectives and expertise of people living with dementia.