An Bord Pleanala is considering a proposal to delivery 450 homes to Leixlip,
Ardstone Homes has lodged an application for 350 houses and 100 apartments at Barnhall.
It also wants to build a chilcare facility and a new roundabout on the Celbridge Road.
It says associated road alignment is required to a vehicular access with revised entrance arrangement to the Wonderful Barn Complex
Since July, planning applications for housing developments of more than 100 homes or more than 200 student bed spaces can be made directly to An Bord Pleanála