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If a recently build house (2 years) has a thin cracks in a long wall (approx 5 metres) from floor to ceiling in more or less a straight line, vertical, about half way along the wall. And the same on the wall opposite. Would you expect that to happen with plaster expanding and contracting or would you be more concerned that it was structural? They don't appear to be changing or widening. There is no sign of cracking outside. The walls were built with thermolyte internally and brick externally.

Sounds like its just the plaster board panels moving, which is quite normal and i wouldn't say anything structural. Newly built houses can take 10 years to settle so this type of thing would be common. Its not great for you to have to correct with the house being new. But simply cut a v-shape along the line of the crack and fill with a flexible filler to solve the problem. Hope this helps.

[quote="debbie thompson"]If a recently build house (2 years) has a thin cracks in a long wall (approx 5 metres) from floor to ceiling in more or less a straight line, vertical, about half way along the wall. And the same on the wall opposite. Would you expect that to happen with plaster expanding and contracting or would you be more concerned that it was structural? They don't appear to be changing or widening. There is no sign of cracking outside. The walls were built with thermolyte internally and brick externally.[/quote] This is normal a new house needs time to settle, central heating plays havoc with everything but what i really need to know is how wide are cracks? A couple of mm nothing to worry about really would expect cracks around ceiling to wall or around wood to plaster ie door frames ect decorators caulking or good quality filler should fix no problem.