Three quotes for the same wall, thousands apart, and no way to tell which is right. The problem is almost never that one contractor is dishonest. It is that each of them was left to decide what the job consisted of, so three different jobs got priced, and the numbers were never comparable in the first place.
Write the scope before you make a call
The single change that makes bids comparable is deciding the scope yourself and handing the same document to everyone. It does not need technical language. Describe the area with rough dimensions, say what exists now and what should exist afterwards, note what is being removed and who disposes of it, state any material preference, and flag access constraints and anything that must be protected. Ask every contractor to price that document and to list anything they would add. Now the differences between bids are answers to the same question.
Vetting comes before pricing
Before I compare a single number, I confirm each contractor is licensed where the work requires it, carries liability coverage and workers’ compensation, and can show recent local work of the same type rather than of any type. An uninsured bid is not a cheaper bid, it is an uninsured one, and if someone is injured on the property or the work fails, the exposure lands on the owner. Guidance on vetting and hiring qualified masons is published by the Mason Contractors Association of America.
Insist on itemization
Ask for the price broken into demolition and disposal, excavation and base preparation, materials with specifications rather than categories, labor, equipment and access, and cleanup. Specifications are the part that matters: mortar type rather than the word mortar, base depth rather than the word base, and named products for drainage components. When a bid is itemized this way, comparison becomes mechanical, and the line causing the difference between two quotes usually identifies itself immediately.
The red flags that show up in the paperwork
A large deposit demanded before any material is ordered. A quote that will not itemize. Pressure to decide today, or a discount that expires. No written scope, only a total. A reluctance to provide an insurance certificate. Cash-only terms, or an offer to skip a permit as a favour, which usually means the permit could not be obtained. And a bid dramatically below the others, which is not generosity but a scope that has quietly lost the buried work.
What to ask while they are on site
The site visit is where the useful information is. Ask what the base will be and how deep, and why that depth for this soil. Ask where water will go. Ask who is actually on site each day and whether any of it is subcontracted. Ask how long the work will take and what happens if the ground turns out differently than expected. Ask what the warranty covers and for how long, in writing. A contractor who answers these specifically has thought about your job; one who answers in generalities is quoting from a template. It is also worth watching what they do rather than only what they say. Someone who walks the whole area, looks at where the downspouts discharge, probes the ground, and asks what the space is used for is gathering the information a real price depends on. Someone who paces the length, glances at the wall, and quotes from the driveway has priced an average job rather than yours, and averages are exactly what goes wrong once the excavation opens up.
Frequently asked questions
How many quotes are worth getting? Three is the usual answer and it works, provided all three price the same written scope. Ten quotes on an undefined job produce ten incomparable numbers and no more clarity than one.
Is a verbal quote ever acceptable? For a very small repair, perhaps. For anything structural or substantial, no. The written scope is what defines the work, and without it every disagreement later is a matter of recollection.
Should the lowest bid win? Not by default. The lowest bid usually wins by omitting something, often structural work that cannot be seen, such as footing depth or drainage. Compare itemized scopes, verify licensing and insurance, and buy the most complete work at a fair price. Coating quotes hide the same thing: an epoxy flooring installer in Las Vegas who omits surface prep will always look cheaper than one who priced the grinding.