Thanks for your helpful replies. I, too, think it could just be a crack in the plaster board rather than the more sinister structural crack. Makes a difference in the decision to either sell now before more problems emerge or holding it for longer term and just fixing the plaster.

Thanks again.

The cracks appeared around Dec 2013 (6months ago). House was built approx. 2005 (hence I didn’t think it would be structural crack as these would appear a bit earlier and would have been more pronounced. Over the last 6 months, the crack hasn’t gotten any worse – it has pretty much stayed the same.

No staining or change in colour.

The cracks are on the ceiling above the BIR (built-in robe) of the bedrooms and not on the walls, so external walls are not affected. In one bedroom, the crack is in a semi-circle but is quite deep and pronounced. In another bedroom, the crack is not as deep but is starting to crack on a straight line across the ceiling (not diagonal line) – it could possibly be where the plasterboard on the ceilings were joint?

House is single level.