Soldato
It's a bit too simplistic to blame it on sub contractors not caring. I may be biased working for a sub contractor of the like of Taylor Wimpey but it mainly comes down to how organised site management is. Often sub contractors are asked to rush though work and told it doesn't matter how it looks and just get it done as there is already CMLs booked or the site management has to meet targets for how many houses built. Biggest issue of all though is being booked in when only part of the job is actually ready, this is how things end up missed or wrong/don't work as it's been done in the wrong order. As a general rule the bigger the house builder the worse quality houses they tend to be due to more corporate pressure of just getting them built and worrying about issues after. Your best off going to visit to site and have a chat with the site manager to try get a gauge of what's it like.