Three is the starting point, not the rule
Ask any experienced homeowner in the Triangle how many quotes to collect and you'll hear "three" more than any other number. It's not a magic figure — it's the minimum needed to see a pattern. One quote tells you what one contractor thinks the job is worth. Two quotes just tell you which of two people bid higher. Three is where you start to see whether a price is typical, unusually low, or padded.
Below three, you're guessing. Above four or five, you're usually just spending more evenings on-site walking contractors through the same job for very little added insight — which is the diminishing-returns problem below.
Why more quotes stop helping after a point
Every additional quote costs you something: a scheduled visit, a wait for the estimate to land in your inbox, and time spent re-explaining the scope. The first three quotes usually reveal the real range. A fourth or fifth quote occasionally catches an outlier — a contractor who's slow right now and hungry for work, or one who clearly doesn't want the job and prices accordingly high. But most of the time, quotes four and five just confirm what quotes one through three already showed you.
The exception: if your first three quotes are wildly inconsistent — say, a spread of more than 40-50% between the lowest and highest — that's a signal to get a fourth opinion before you decide anything. A wide spread usually means the contractors aren't all pricing the same scope of work, which is the next problem.
Compare scope first, price second
In a market as busy as Raleigh-Durham right now, price gaps between quotes are often scope gaps in disguise. The region has seen sharp wage pressure — one industry analysis found the Raleigh-Durham area reported 9-11% wage increases driven by R&D facilities and cleanroom construction requirements