Retail need tests are only required for retail developments, as described in Planning Policy Wales and TAN 4 Retail and Commercial Centre Development.
Dim ond ar gyfer datblygiadau manwerthu y mae angen profion o angen manwerthu, fel y disgrifir ym Mholisi Cynllunio Cymru a TAN 4: Datblygiadau Manwerthu a Masnachol.