No new housing should be shoe-horned into existing villages. To the extent that open spaces already exist, that is great. To the extent that they do not, new developments of greenfield sites NEVER result in a net increase in open spaces. Even if an area that is not developed is privately owned, it still constitutes open space with the ensuing benefits of support for nature and wildlife, improved flood defences and views out of villages / a feeling of openness. Building developments on such land, even where they incorporate some open / green space, is still a substantial net decrease in open space compared to not having developed the land.