[BBC] A 300-strong colony of Natterer's bats roost in the roof of St Andrew's Church in Holme Hale but cannot be removed as they are a protected species.
Rev Stephen Thorp said the bats are "off-putting" and have made couples look elsewhere for their wedding.
The church hopes new ultrasound technology will resolve the problem.
The Home Hale colony, near Swaffham, is thought to be one of the biggest in England.
The bats tend to fly within the body of the church where excrement can then damage furnishings and sometimes irreplaceable objects of international significance, said experts.
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