A driveway story has been making the rounds this month. Atlanta News First reported on October 6 that Skip and Maria Mason paid $52,000 for a colored concrete driveway meant to be terracotta, to match the roof of their Mediterranean-style home. Five months after the pour, it's a light pink.
"It's not even close to the color it's supposed to be," Skip Mason told the station.
Mason told the station the color matched the approved sample when the concrete was poured, then got lighter as it dried. The terracotta shade now shows up only when it rains or when the driveway is hosed down. The contractor hadn't responded to the station's requests for comment, so we don't know what went wrong on that job, and we won't guess.
What we can do is explain how colored concrete works, because a new driveway is a big-ticket job, and color is one of the easiest things to get wrong.
Wet concrete is darker than dry concrete
This is the first thing to know. Solomon Colors, a maker of concrete pigments, puts it plainly: freshly poured concrete looks darker because of its higher moisture content, and as the concrete cures and water evaporates, the color lightens and evens out.
So the shade you see on pour day is not the shade you'll live with. Judge a color sample dry, never wet, and ideally after it has cured for a while.
There's a flip side. Solomon Colors also notes that a film-forming sealer can darken the color to about the shade it had when wet, and many sealers add a sheen from matte to high gloss. If your driveway only looks right when it rains, ask your installer whether a color-enhancing sealer is an option. It won't fix a mix that was wrong, but it changes what you see.
What makes colored concrete vary
Integral color means the pigment is mixed into the whole batch, so it goes all the way through the slab. Even then, the final shade depends on a long list of things. In a guide for contractors on keeping color consistent across pours, Solomon Colors names these:
- Extra water. Water dilutes both the cement and the pigment, so water added at the truck to make the mix easier to place lightens the color.
- Water on the surface. Spraying water while finishing can lighten the surface and cause streaks.
- The cement itself. Gray cement isn't one exact color. The same type of cement from different plants can give a different finished shade.
- The sand. Lighter sands make lighter concrete, and darker sands make darker concrete.
- Calcium chloride. This common accelerator is hard to spread evenly, and uneven spots can set darker. The guide recommends a non-chloride accelerator for colored work.
- Finishing and curing. Troweling too early, uneven trowel pressure, switching tools mid-slab, broom technique, and curing under plastic sheeting can all show up as shade differences.
Pigment dose matters too. Solomon Colors says the optimum loading is 2% to 4%, that below 1% the color can look washed out or patchy, and that above 7% you've hit the saturation point, where more pigment won't make the color any stronger.
Before you sign for a colored driveway
Based on the pigment maker's advice and the consumer tips in the Atlanta News First report:
- Ask for a mockup. Solomon Colors recommends a sample poured under actual job conditions, kept on site as the reference for the real job.
- Approve the color dry. A wet sample will look darker than the finished slab.
- Put the color in writing, including the pigment name or number and the dose.
- Ask about water and accelerators. "No water added at the truck" and "non-chloride accelerator" are fair questions for colored work.
- Check the company. The station suggests verifying a physical address, confirming the company uses its own crew, and talking to recent customers in person.
How thick should a driveway be?
Concrete Network says 4 inches is the minimum for a residential driveway carrying passenger cars and SUVs. For heavier vehicles, such as half-ton trucks or large RVs, it suggests 5 to 6 inches. Some towns require the apron, where the driveway meets the street, to be 5 or 6 inches thick, so check with your local building department.
The extra inch isn't free. Concrete Network estimates going from 4 to 5 inches can add about 20% to your total concrete cost, while boosting load capacity by nearly 50%. It also notes that 5-inch and thicker driveways usually get rebar, while 4 to 5 inches commonly use wire mesh.
How much concrete a two-car driveway takes
Here's a common two-car driveway, 20 × 24 ft (480 sq ft), run through our concrete calculator with 10% extra for spillage and uneven ground:
| Thickness | Concrete volume | With 10% extra | Ready-mix to order |
|---|---|---|---|
| 4 in | 160 cu ft | 6.52 cu yd | 6.75 cu yd |
| 5 in | 200 cu ft | 8.15 cu yd | 8.25 cu yd |
Ready-mix is usually ordered in quarter-yard steps, so we rounded up. The jump from 4 to 5 inches adds 25% more concrete, about 1.6 cubic yards, which is the main reason it costs more. A single-car driveway 12 ft wide and 40 ft long is also 480 sq ft, so it needs the same amounts.
Most driveways sit on a compacted gravel base. If your contractor calls for 4 inches of gravel under that same 480 sq ft, the cubic yard calculator gives 5.93 cu yd, or about 6 yards in bulk. At the calculator's 1.4 tons per yard, that's roughly 8.3 tons.
Fun fact: You could pour that 4-inch, 20 × 24 ft driveway from bags, but you'd need 294 bags of 80-lb mix. That's 23,520 lb, or almost 12 tons of bags to lift, haul and mix by hand. It's why the concrete calculator suggests ready-mix once a job reaches about a cubic yard.
Measure first, then get quotes
If your driveway isn't a simple rectangle, break it into rectangles and triangles in the square footage calculator, then use that area with your thickness in the concrete calculator. Knowing the yardage helps you compare quotes line by line. If you're going colored, also ask that every truck use the same cement source and the same pigment dose. Solomon Colors warns that switching suppliers mid-job, or dosing a small final load as if it were a full truck, can change the shade.
Sources
- Atlanta News First: They paid $52K for a driveway to match their home. They got pink concrete instead. (October 6, 2026)
- Solomon Colors: Colored concrete FAQs
- Solomon Colors: Consistency across pours
- Concrete Network: How thick should a concrete driveway be?
- Trend signal: news coverage from the past two weeks (Google Trends could not be checked on this run)
