The hidden cost in the cheapest quote you'll ever accept

When three quotes come back and one is noticeably lower than the other two, the instinct is to treat it as the good deal the other two missed. Sometimes it is — a smaller operation with lower overheads can genuinely undercut a bigger one on the same quality of work. But a suspiciously low quote is more often explained by one of three things, and none of them are "you got lucky."

The first is under-specifying materials — a cheaper grade of paint, thinner insulation, a boiler a size smaller than the property actually needs — things that look identical on the quote line but not in five years. The second is scope creep: a deliberately narrow quote that becomes a series of "that'll be extra" additions once work has already started and switching provider mid-job is expensive and disruptive. The third, and the most common, is simply a quote priced to win the job with a plan to catch up on margin through those same additions later.

None of this means the cheapest quote is automatically wrong. It means the cheapest quote is the one that most deserves a specific question: what exactly is included, in writing, and is this a fixed price or an estimate that assumes nothing goes wrong. A quote that survives that question in detail is a genuinely good deal. One that gets vague under it usually explains its own gap to the other two.