Extra care
Definition
CQC

These services cover many different arrangements. Usually, they consist of purpose built accommodation in which varying amounts of care and support can be offered, and where some services and facilities are shared.
The care that people receive is regulated by the Care Quality Commission, but the accommodation is not.
Definition
NE Lincolnshire Council: Social Care Handbook

Extra care housing is housing designed with the needs of frailer older people in mind; varying levels of care and support are available on site.
Plain English definition
Think Local Act Personal (TLAP) Jargon Buster

Similar to sheltered housing, but with additional care and support available for people with illnesses or disabilities who wish to have a home of their own. Extra-care housing may be an option if living alone at home is difficult, but you do not wish to opt for residential care. It allows you to have your own home, either rented or bought, with personal care and domestic help readily available.