How to Evaluate 3 Grading Quotes That Don't Agree — NC Homeowner's Diagnostic

You asked three contractors the same question — “can you fix my yard drainage?” — and got three different answers with three different price tags. $14,800. $7,200. $5,200.

The problem isn’t the spread. The problem is that you don’t know which answer is right for your lot. Before you pick a number, you need to figure out which contractor actually diagnosed your yard.

Step 1 — Check the Scope, Not the Total

If two quotes list different scopes, you’re comparing two different jobs. The price difference tells you nothing until you reconcile what each contractor actually proposed to do.

Pull out all three quotes and look for these specific details:

• Square footage or cubic yards stated? A quote that says “grade the yard” versus one that says “regrade 2,400 sq ft, move approximately 45 cubic yards of Piedmont clay, establish 2% slope toward street” — those are not the same quote.
• Drainage destination named? “Install French drain” tells you nothing about how French drain systems NC actually behave in Piedmont clay. “Daylight a 4-inch perf pipe to the swale at the property boundary” tells you where the water actually goes.
• Compaction method stated? “Grade and seed” will settle after the first rain. “Compact in 6-inch lifts with vibratory plate, proof-roll before seed” won’t.

Most low-budget grading quotes skip the compaction spec entirely — leaving you to solve yard drainage solutions NC all over again after the first heavy rain.

Step 2 — Reconcile the Volume Calculation

Ask each contractor to walk you through their volume estimate — how many cubic yards do they plan to move, and how did they arrive at that number?

A legitimate grader — the kind you can find when you hire a verified NC grading contractor — has done a cut-fill calculation. They know approximately how much Piedmont clay moves out (cut) and how much needs to come back in (fill). A contractor who “eyeballed it” during a 10-minute walkthrough probably hasn’t run the numbers.

What to ask: “Can you show me how you calculated the cubic yards?”

A good answer sounds like: “I measured the low point at X and the high point at Y, figured about Z yards of cut to get you to a 2% slope with positive drainage toward the street.”

A bad answer sounds like: “I’ve done a lot of these, I know what it costs.”

If a contractor can’t explain the math, they haven’t done the math. That’s what gets you a 3x overrun after mobilization.

Step 3 — Read the Line Items

An itemized quote protects you by making promises specific — each line item is a commitment the contractor can’t walk back after mobilization.

What to look for line by line:

• Mobilization — a reasonable flat fee on a residential job; becomes a red flag if it’s 30% or more of the total on a small residential regrade
• Equipment — does it name the machine? A skid steer, track hoe, and motor grader are three different tools for three different jobs
• Material — if fill is coming in, what kind? Structural fill, screened topsoil, and red clay each have different compaction properties
• Haul-off — if cut material leaves the site, who pays for disposal and where does it go?
• Erosion control — is silt fence and seeding included? North Carolina’s E&S erosion and sediment control regulations require erosion controls for most ground disturbances over 10,000 square feet — confirm with your county, as thresholds can differ at the local level

Lump-sum bids aren’t necessarily dishonest. The problem is you lose the ability to verify whether the work matched the agreement. See what a line-item grading quote should contain for the full line-item breakdown.

Step 4 — The Bid-Spread Diagnostic

If the spread is more than 2x between high and low bids, someone diagnosed your lot differently — or someone didn’t diagnose it at all.

A wide spread is actually diagnostic data. Here’s what’s usually behind it:

• Spread from different scope: Contractor A plans to install a full French drain system with daylit outlets. Contractor C plans to regrade only. Same yard, completely different fix.
• Spread from padding: Contractor A’s mobilization is $4,200. Contractor B’s is $1,800. Ask both to justify it.
• Spread from lowball: Contractor C’s price assumes no haul-off, no E&S controls, and self-compacting Piedmont clay. None of those assumptions hold in NC.

When the spread is over 3x, get a fourth quote — or ask Contractor C to scope-match. “Can you price it with the same drainage spec as Contractor A?” puts all three on comparable footing.

Read more about how to interpret a wide bid spread — that page covers the diagnostic interpretation after you’ve worked through the scope reconciliation here.

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The One Flag That Kills a Bid Outright

If a contractor can’t give you an active NCLBGC NC Licensing Board for General Contractors license number when asked, stop the evaluation process.

Price comparison is secondary to qualification. Before comparing line items, confirm each contractor has:

1. An active NC license — verify directly at the NCLBGC portal (nclbgc.org), not just their word
2. A COI Certificate of Insurance with general liability coverage that names your project

Everything else — the spread, the scope, the line items — only matters if you’re comparing licensed, insured contractors.

See red flags that kill a bid outright and NC contractor licensing requirements for the full qualification checklist.

The Comparison Matrix — What’s in a Vague Bid vs a Good One

Common Mistakes

Choosing the middle price by default. Middle price doesn’t mean middle quality — it means someone bid $4,000 under the detailed contractor without showing why.

Not asking for volume math. If a contractor can’t explain how they got to their cubic-yard estimate, they guessed. That guess becomes your problem during construction.

Comparing totals without reconciling scope. Two quotes pricing two different jobs is not a comparison. It’s two contractors solving two different problems at two different prices.

Ignoring the mobilization line. On small residential jobs, a padded mobilization fee can account for half the spread between bids. Ask both high-bid and low-bid contractors to justify it.

Get a Verified Contractor’s Itemized Quote

The contractors listed on NC Grade and Haul are verified against active NCLBGC license status. When you hire a verified NC grading contractor, you start the evaluation process knowing the baseline qualification question is already answered.

Ask any contractor on our directory for an itemized quote — not a single number, not a “free estimate.” A line-item quote with cubic yards, compaction spec, and drainage destination named.

Questions to Copy and Text to Each Contractor