Yurts and shepherd's huts are springing up in Gower without planning permission, it has been claimed.
Gordon Howe said conservation group the Gower Society, which he represented, could only pick up a "smattering" of them when it conducted fly-overs of the area of outstanding natural beauty (AONB) twice a year.
But he said the growth of yurts and the like had accelerated since the coronavirus pandemic, when foreign travel had been limited.
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"I must confess there is a lot of new developments below the radar, and the radar is planning," Mr Howe told a meeting of the Swansea Council-led Gower AONB Partnership Steering Group.
"There is an awful lot of yurts, shepherd's huts and extensions going on off the radar until you look at Google Earth and then, all of a sudden, it pops up."
Mr Howe said people could click on some of these developments on Google Earth and details of the business came up. He claimed such businesses were earning money but not contributing financially.
The council is undertaking a review of Gower's capacity for camping and caravan sites, which will consider the rise of new types of visitor accommodation.
Council officer Ruth Henderson said people needed to make the authority aware of potential planning breaches so it could investigate, although she said there was a "huge backlog" in enforcement currently.
Mr Howe said the Gower Society wasn't complaining about all of the developments he referred to.
"We are not having a downer on tourism, in that sense, we just think it's wrong that people should be able to do what they like and just ignore the system that many of us respect," he said.
Natural Resources Wales (NRW) officer Hamish Osborn said there was a problem in many places in Gower with the way developments disposed of sewage.
He said this needed to be factored into the planning process.
Ms Henderson said she understood that NRW was a consultee on planning applications.
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"We are not consulted on everything," said Mr Osborn. "Sometimes not all of the comments filter through. I think there is a planning policy that is not always adhered to as strictly as it might be."
He said there was a drainage concern currently involving a group of cottages and cabins.
The steering group also considered the cumulative impact of mass participation events in the AONB.
Members said more prior notification and a central system of logging such events would be a good idea.
Paul Thornton, of the Wildlife Trust of South and West Wales, said he only became aware of one such event when he came across a pony munching on one of its wayfaring flags.
Mr Howe said it was a difficult balance as nobody wanted to be accused of denying people the chance to take part in them.
But he added: "There's far more going on than we realise."
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