Detailed drawings and plans, among other things, will need to be considered and consultations may be required from other relevant departments before being able to advise further.
Bydd angen ystyried lluniadau a chynlluniau manwl, ymysg pethau eraill, ac efallai y bydd angen ymgynghoriadau gan adrannau perthnasol eraill cyn gallu cynghori ymhellach.