Fy mwriad hefyd yw cyflwyno rheolau ar ddefnyddio lloriau mesanîn newydd mewn datblygiadau manwerthu, dull sydd wedi'i ddefnyddio gan fanwerthwyr ar gyerion y dref i gynyddu maint eu siopau yn sylweddol, heb fod angen caniatâd cynllunio.  Byddaf yn ymgynghori ar natur benodol y rheolau hyn maes o law.
It is also my intention to introduce controls on the insertion of new mezzanine floors in retail developments, a tool which has been used by out-of-town retailers to increase the sizes of their stores significantly, without the need for planning permission. I shall be consulting on the specific nature of these controls in due course.