Why an Honest Checklist Matters
Driveway replacement is one of the highest-dollar exterior projects most homeowners ever buy. The market is full of contractors competing on price by cutting the parts of the job nobody sees — sub-base, reinforcement, mix spec — and selling a thin, under-engineered slab that looks identical to a properly-built one for the first 18 months. This checklist tells you what to demand from every quote so you are comparing real projects, not the prettiest bid.
The Frankenstein Slab Reality
Some contractors will quote you a sunken-slab fix using mudjacking or modern poly-leveling — injecting fill material under the slab through drilled ports to lift it back to grade. This works mechanically. The problem is cosmetic: the lift leaves dozens of patched pump-port holes and exposed crack sealant across the surface, creating what we call a Frankenstein slab. To hide the scars you need a uniform resurfacing overlay on top of the lift. Once you add the injection cost plus the cosmetic resurfacing, the combined bill frequently matches or exceeds a full rip-and-replace on freshly compacted gravel — and the rip-and-replace gives you a sound new sub-base instead of a band-aid on a failing one. Ask any contractor quoting an injection-only fix what the slab will actually look like when they are done.
Sub-Base Questions to Ask Every Contractor
What is under the slab determines whether the driveway lasts 30 years or 5. Demand specifics:
• What gravel mix do you use, and how deep? (Expect a custom blend of #57 stone and 21A compactible gravel, 4 to 6 inches deep, over the native clay.)
• How many passes of compaction, and in what lift depths? (Expect 2-inch lifts, multiple passes per lift, mechanical compaction — not 'we eyeball it.')
• What separates the gravel from the clay underneath? (Expect non-woven geotextile fabric. Without it, clay pumps up into the gravel over the first wet/dry cycles and the base loses its compaction.)
If any of those answers is vague or skipped, the slab on top is going to fail no matter how good the pour looks.
Slab Thickness — 4 to 5 Inches, Not Less
Standard residential driveways should be poured 4 inches thick minimum, with 5 inches the right call wherever heavier vehicles or delivery trucks ever touch the slab. Some contractors quote 3-inch slabs to compete on price. A 3-inch slab cracks under real-world neighborhood traffic — heavy delivery step-vans turning around, contractor trucks parking loaded, a moving truck the day you sell the house. Get the slab thickness in writing on the contract and do not negotiate it down.
Reinforcement — Wire Mesh and #4 Rebar, Not Nothing
A properly-engineered residential driveway is reinforced with a combination of steel wire mesh and #4 rebar grid, tied and elevated so the steel sits in the center of the slab where it actually does work. Some contractors quote 'fiber-reinforced' concrete in lieu of steel — fiber is fine as a supplement, not a replacement. Some quote no reinforcement at all. An unreinforced slab will crack along thermal-expansion lines within the first Northern Virginia winter.
Mix Specification — Winterized and High-Strength
Demand a high-strength, winterized concrete mix engineered for Northern Virginia freeze-thaw cycles. The exact technical spec matters less than the contractor being able to articulate why they chose it. If they cannot explain the mix beyond 'concrete is concrete,' walk away.
Permits, Aprons, and Right-of-Way Responsibilities
Replacing a driveway on the original footprint usually does not require a building permit, but extending into the right-of-way, widening, or touching the apron at the public street always does. Apron work is its own scope — it requires Line-of-Sight studies, municipal engineering, and county or VDOT permits. A contractor offering to handle the slab AND the apron themselves is usually one of two things: actually capable (rare, expensive) or about to subcontract the apron piece and leave you with two warranties and finger-pointing if something goes wrong at the seam. The cleaner pattern is one contractor doing the whole driveway project end-to-end.
The Contractor Red-Flag Checklist
Get more than one quote and compare them on these specifics, not on bottom-line price:
• Specific gravel type and lift depth? • Non-woven geotextile under the gravel? • Slab thickness in writing? • Reinforcement type (mesh + rebar)? • Mix spec articulated? • Apron work included or sub-contracted? • Written warranty terms? • Insurance certificate provided up front?
If two quotes look 30 percent apart on total price, the cheaper one is almost certainly cutting from the list above.