# The Town and Country Planning (General Permitted Development) Order 1995, Paragraph D.1: Development not permitted


Development is not permitted by Class D if—
(a) the total area covered by the water source heat pump (including any pipes) exceeds 0.5 hectares; or
(b) the capacity of the water source heat pump exceeds 45 kilowatts thermal.

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Source: https://www.legislation.gov.uk/uksi/1995/418/schedule/2/part/43n1/paragraph/D.1 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-general-permitted-development-order-1995/schedule-2/part-43n1/paragraph-D.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.