Mae’r Ddeddf wedi atgyfnerthu’r ystyriaeth a roddir i’r Gymraeg ar bob lefel o'r system gynllunio, gan ddechrau â’r Fframwaith Datblygu Cenedlaethol, Cynlluniau Datblygu Strategol ac i lawr i Gynlluniau Datblygu Lleol. Dangosodd y Ddeddf ymrwymiad Llywodraeth Cymru i ymdrechu i sicrhau bod yr iaith Gymraeg yn ffyniannus ac yn fywiog ym mhob rhan o Gymru.
The Act consolidated consideration for the Welsh language at every level of the planning system, from the National Development Framework, through to Strategic Development Plans and down to Local Development Plans.  It demonstrated the Welsh Government’s commitment to strive for a Welsh language that is thriving and vibrant in every part of Wales.