I split my extension into three phases, the first being a water tight shell, the second internal works and the third landscaping.
I hired Steve to carry out Phase 1. I had three quotes, but chose Steve as he showed most interest by carrying out two site visits and looking through the plans thoroughly before submitting a price.
During the build process, Steve demonstrated a vast depth of knowledge in construction and building regulations. I felt at all times that he was in full control of the project.
The quality of work was very high. Time was taken to do the job properly. Steve was onsite everyday.
I kept an online diary of progress which has plenty of pictures.
http://www.house-extension.co.uk/forum/topic.asp?TOPIC_ID=912&whichpage=1
As a result of the high standard of work for Phase 1, I then hired Steve to take on Phase 2, the internal works. I ran out of money for Phase 3.
In summary, would I recommend SanBuild : Yes, I think your project would be in safe hands.