Before commencing construction on a plot, it is highly essential to study it from the Vastu point of view. This includes checking out the worthiness of the environment which can be determined by making sure the plot does not stand next to any graveyard, crematorium or cemetery. Quite apart from the rigmarole and nuisance of having to view funeral processions from time to time, such plots should be avoided as they cause a lot of psychological harm to the dweller as he gets constantly reminded of mortality. Moreover, crematorium grounds are associated with a lot of tantric black magic rituals and rites which makes such plots anti Vastu.
As a Vastu practitioner, I strongly recommend checking for direction of slope in the plot as one of the main Vastu tips for house construction before starting construction work on it. A slope towards the east of the plot provides overall wellbeing while a slope along the north is a generator of wealth, the reason being north is the direction owned and ruled by the God of wealth Kuber. A slope to the west is inimical to knowledge while a south descending slope is extremely harmful for the residents. On a general note, the North-South axis of the site should be the larger side of the rectangular plot. Additionally, water flowing along the west and south sides of a property is regarded as bad for long-term prospects of those inhabiting it. On the contrary, a river flowing in the north-east direction is like a dream come true for Vastu followers. It has been seen that many ashrams have developed along such naturally existing feature in a plot.
If a plot has prominent natural features of having rocks, hills, moulds or large boulders in the south, south-west or west direction of the site, these can be left in their place. These directions should have heavy objects which are capable of blocking the afternoon sun rays. If there are heavy objects in directions other than those mentioned above, they should be removed immediately. If this cannot be done, then it is best to avoid such plots.
As for religious structures with a plot or site, these are well regarded or at least tolerated. When lying outside the boundaries of your plot, they would cast heavy shadows on your fortune. The energies of the site all get focussed on this religious magnet which explains why temple towns and pilgrimage places are never converted to anything else. The same issue of a dwelling’s energies being drawn off by a powerful neighbouring structure means one should not construct a residence near schools, cinemas, hospitals and so on.
A dilapidated structure, on the verge of getting ruined, near your site should be avoided too. History says that ruins have never been regarded as picturesque; it is even avoided by those who are homeless. However, all these obstacles can be nullified if there happens to be a public road between them and the site. Also, if the distance between the bringers of bad luck and your site happens to be double the height o f your house the bad lick caused by it gets nullified automatically.