We are thinking of getting our loft converted in the new year - obviously subject to Covid-related job retention, new taxes, recession etc.
If we do go ahead, has anyone in hertfordshire used a company that they recommend? And would anyone mind putting their approx costs so i can see which quotes end up being cowboys? 
I’m looking at a fairly straightforward velux conversion with no bathroom, but a slightly complicated staircase up that would have to turn a right angle half way and be unsupported so imagine That will bump up the costs. I’ve been reading the older loft-conversion threads and have picked up a lot of useful info (esp staged payments and get timetables for each part) but wondered if anyone had any additional words of wisdom to impart?