Church consultation is a broad discipline that covers many facets of church needs. And the field covers churches of any size, from small, rural churches to large, suburban megachurches. Granted, a larger church typically has more resources that allows for a deeper analysis, but consultants also have much to offer the smaller church as well.
Rainer, S. S. (2004). The Emerging Trend of Comprehensive Church Consultations. Journal of the American Society for Church Growth, 15(3), 3-15. Retrieved from https://place.asburyseminary.edu/jascg/vol15/iss3/2