Poorly kept buildings and work done to them by church members or hack contractors who have no business doing the work.
In fact 75% of the churches I have been in as a contractor working or visiting have 2 or more items which should be red tagged and put out of service and in some cases building code violations are so heinous as the church should not be allowed to hold services.
Why then is the church allowed to conduct services if there are such bad things going on inside ?
Mainly it is because local code enforcement does not crack down on churches like they do normal business.
Many churches have not been properly inspected in decades .
Why all the bad work and why is it tolerated ?
A good question with many answers.