An Bord Pleanala has given the go-ahead to house builder Cairn Homes to construct 426 residential units near Greystones in Co Wicklow.
The appeals board has granted the developer planning permission in spite of local opposition to the homes in the fast-track planning application.
The planned homes on a site within the townlands of Farrankelly and Killincarrig, Delgany, located 2.5km south of Greystones, is made up of 245 houses and 181 apartments.
The development includes three four-storey apartment blocks at the centre of the development.
As part of the planning permission, Cairn Homes is required to sell 42 units to the local authority for social and affordable housing.
The appeals board received 18 submissions on the plan from locals, councillors and sports clubs.
Objectors claimed the development will not be done in a sustainable way and will lead to a heavy reliance on cars.
A number of councillors supported the proposals but others claimed that the density is excessive and that the scheme will be visually obtrusive and incongruous.
However, the executive of Wicklow County Council backed the plan.
The council executive said that the four-storey apartments at the centre of the development are considered acceptable and comply with the national guidance.
Now, the appeals board has upheld the recommendation of its inspector in the case, Karen Hamilton, to grant planning permission.
The board has ruled that the development would not seriously injure the residential or visual amenities of the area.
Nor would it seriously injure the property in the vicinity or detract from the character or setting of the adjacent protected structure.
The developers were seeking a 10-year permission to complete the development.
However, the appeals board has ordered that the development be carried out within seven years.
As part of a recent trading update, Cairn stated that it expects up to nine new site commencements in the next six to 12 months and has a strong forward sales pipeline.
Cairn Homes recorded pre-tax profits of €21.3m on revenues of €192.4m in the 12 months to the end of last June.