Most of these churches plan to continue to grow, so the design must also accommodate future expansion. The fastest growing churches are the large independents and evangelical denominations that were formed in this century. They tend to expand in direct proportion to their concern for outreach. While some churches are concerned with providing basic human needs and others are concerned with preaching the evangelical gospel, the largest growing churches are concerned with both. Typically the exuberance and charisma of their congregations spark further growth.
Mainline churches tend to start new churches rather than expand an existing congregation.
Delgatty believes that growing churches will be able to sustain growth.