Wall and foundation cracks naturally form due to any small vibrations or structural movement. However, the extent of any cracks can tell its own story about the building itself and its construction.

You should be aware that construction materials use water as an essential ingredient to build with concrete, plaster etc. - and materials that don't often absorb atmospheric moisture during their lifetime... such as wood etc.

Understanding that all materials have a drying out time as water evaporates from them and they reduce in size. There is no way to ensure that all materials shrink at the same rate . This means that the concrete block or brick wall, its plaster covering, the wooden door frame, the beams in the roof and the floor will all shrink at different times and will move apart or against each other as they do so. The extent of such movements become apparent when cracking lines appear. This can leave some fairly impressive looking cracks along the joints of walls, where ceilings and walls connect and running along door frames. Although this is not serious it can be addressed on a cosmetic level. You should insist on your developer or builder to take right away. It is also a good idea to check with your neighbours and see if it is a widespread issue in the development - it is always better to approach the developer as a group rather than as an individual. Where you suspect that the cracking is more serious then you may need to go down a different route.

If you suspect it is structural, you will need to get a independent report from a building surveyor or civil engineer. If this is the case, the developer is most likely at fault and you should approach them accordingly and seek redress.