Ceredigion, Pembrokeshire, Anglesey, Conwy, Powys, Carmarthenshire and Gwynedd are exploring new powers to charge up to 100% extra.
The Welsh Local Government Association said it meant second homes could make a "fair contribution" to the community.
Ceredigion, Pembrokeshire, Anglesey, Conwy, Powys, Carmarthenshire and Gwynedd are exploring new powers to charge up to 100% extra.
The Welsh Local Government Association said it meant second homes could make a "fair contribution" to the community.
14.03.16
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