Ask to see for photo's of their actual work and also call their customers for references, almost all of our work (and we are incredibly busy) comes form referrals.
One the other hand, the ongoing saga of a newly accredited (last week) incompetent, (not deliberately cowboy, just plain incompetent) installer,
Took these photo's of a 'corrected' slate install -(owner asked me to check it over) it is being redone again next week - their electrics are OK, on the roof though they are using a mix of themselves (sparks) and roofers with no Solar PV Installation training;
The screws on EVERY bracket were loose, because the bracket used was installed in the wrong way (again...) I could see from the ground that something wasn't correct.
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The most worrying thing... they have been working for another installer as a sub-contractor for the last 3 months..
So, this customer will get a good job done here, however there must be a number of installations that they have done that are clearly going to cause problems, - who to report them to that actually has any teeth / jurisdiction to make them do anything?