Countryside is billing its new development, Brook Valley Gardens, as "an ideal oasis surrounded by diverse landscapes, wildlife and green open spaces", inspired by the early 20th-century "garden suburbs".
Countryside said: "Research has shown that moving to an area with green space has a sustained and long lasting impact on people's well-being, far more than a pay rise or promotion, which only provides a short term boost.
"Combined with the benefits to the environment as well, living by green space is hugely beneficial physically and mentally and also provides a great way to spend time with family and friends."
The development is bordered by leafy residential areas, playing fields, open space and golf courses. Nature reserves at Rowley Green Common and Totteridge Common have a number of large ponds for children to enjoy and learn. There is an outdoor activity centre for orienteering, adventure courses and camping at Moat Mount Outdoor Centre. There is a wildlife-rich ancient meadow at Totteridge Fields and Monken Hadley Common's bridleway is "ideal" for horse riding and cycling.
Richard Cherry, CEO of Partnerships at Countryside, commented: "Our main priorities when regenerating the former Dollis Valley Estate into Brook Valley Gardens was to focus on the principles of green open space, community, imaginative design and healthy living.
"More people now, especially families, are recognising the health benefits of moving away from a frantic 24 hour lifestyle and enjoying time together in a more relaxed and slower paced environment. Our regeneration of the area is allowing more people to be able to enjoy an improved and healthier lifestyle."
Over around 12 years and five phases, 600 new homes will be built, each with a private rear garden. Residents and the surrounding local community will also benefit from a new community centre, nursery, shared communal gardens, children's play areas and public open spaces providing "a rich mix of facilities, landscapes, habitats and wildlife".