I'll respond to that as a retired builder.
The customer has accepted the quote so I don't view that as fraud although I never did that as I'd be uncomfortable with it and would have given back at least some of the savings however I only ever accepted work from customers I felt I could trust or were refered by existing customers and I saw that trust as being both ways.
There are some very dodgy builders out there but also very dodgy customers. I had several instances where customers attempted to sqeeze discount
after the work was complete which IMO is morally just as bad as Phils' example and a few slow / very slow payment but those people were quickly blacklisted and no further work accepted however much they begged.
Profit on top of overheads, wages and material costs is a valid and essential part of business, how else would you be able to invest in and expand the business as well as cover unexpected costs and a failed business is of no use to a customer who wants that business to continue trading in case he has future callbacks.
Materials were usually priced at retail with some exceptions, I rarely would accept work unless I provided the materials ( customers are often very bad at project management ) and I had full control, that way I could ensure it was carried out to my standards and on time. If someone wasn't happy with my price and asked me to cut corners I refused and suggested there look for others who would do that, changing the design whilst retaining quality was a different matter.
I had my business for more than 18 years before retiring and it was very successful though harder work, longer hours and I was paid more managing companies for other people. It was built purely on reputation, I never overcharged but was far from cheapest either, my opinion is that whilst everyone would like a RR for the price of a Mini in reality what they really want is a good job for a fair price. The customer has a duty to himself to do the research and it is after all his decision whether to accept or refuse a price.
e would you be able to invest in and expand the business as well as cover unexpected costs.
The vast majority of small business owners are honest and fair and they work bloody hard, long hours in the business which has undoubted rewards but also drawbacks often having the added responsibility of providing a livelihood for employees, sometimes a heavy burden.
Bob
( thankfully now retired
)