Regrading vs. a Drainage System: How to Tell Before You Sell

The back corner of a 1978 ranch held water for three days after every inch of rain. The homeowner had a quote in hand: 160 feet of French drain, two catch basins, a pop-up emitter, a little over $12,000. What the yard actually needed was about eleven yards of screened topsoil, a day with a skid steer and a laser, and 900 square feet of sod.

That job went to the second contractor who looked at it. The first one never shot a single elevation.

Selling pipe before you've proven that grade can't do the work is the most reliable way to lose a bid you should have won. It's also how contractors end up warrantying a system that never touched the real problem, because the water was never in the soil to begin with.

Most wet yards have two problems stacked, and only one of them needs pipe

Surface water and subsurface water fail differently, and they get fixed differently. Surface water is rain that lands on grass, roof or pavement and has nowhere downhill to go. Regrading solves it, because regrading is the only thing that changes where water goes when it's still on top of the ground.

Subsurface water is water already in the soil — perched on a clay lens, sitting on a high table, pushing out of a seam in a hillside. No amount of shaping the surface moves it. That's what pipe and stone are for.

The reason contractors mix these up is that both look identical on the first phone call. The homeowner says "the back yard stays wet." You need a read that separates them, and the cleanest one is timing. Standing water in a defined low spot 24 hours after the rain stops, with a clear high side, is a grade problem. A whole lawn that's still spongy at 48 hours with no ponding anywhere is a soil problem. Plenty of yards are both, and in those the grading half is usually cheaper and always comes first.

If you want the full source-by-source read before you narrow it to this question, the five-source field diagnostic covers grade, roof water, soil, water table and off-site runoff in one visit. What follows assumes you've already got the big picture and now have to decide what to put on the estimate.

Four measurements decide it, and they take fifteen minutes

Do these in order. The first one that comes back wrong usually ends the conversation about grading.

1. Fall from the wet spot to your lowest legal discharge point. Shoot it with a laser, or run a string line and a torpedo level if that's what's in the truck. You need 1% minimum across lawn to keep sheet flow moving — that's an eighth of an inch per foot — and closer to 2% for the first ten feet off a foundation. Over a 35-foot run at 2%, that's 35 × 0.25 in = 8.75 inches of drop. If the total existing drop between those two points is two inches, you now know exactly how much elevation you have to manufacture.
2. Exposed foundation at the house. Measure from finished grade to the bottom of the siding or the top of the block. Most codes want six inches of foundation showing, and most siding manufacturers want four to six inches of clearance. If you've got eight inches exposed, you can add maybe two to four inches of fill at the wall and no more. This number kills more regrades than anything else, because the fix everybody imagines — build the high side up — is often off the table before you start.
3. A shovel hole, 12 to 18 inches deep, in the wettest spot. Dig it and watch the walls for ten minutes. Water weeping in from the sides at eight or ten inches means the soil is already charged and grading won't touch it. A hole that's saturated in the top four inches of topsoil and dry below is a surface problem wearing a disguise.
4. Roof volume. An inch of rain produces about 0.623 gallons per square foot of roof. A 1,600-square-foot footprint puts out 1,600 × 0.623 = roughly 1,000 gallons per inch of rain, and if that's split across four leaders, each one is dumping about 250 gallons within a few feet of the wall. Count the downspouts, look at where they end, and do this math out loud in front of the homeowner. On a surprising number of jobs the whole problem is 40 feet of buried leader extension and a corrected pitch.

If the shovel hole comes back wet from below, run a perc test before you price anything, because the answer stops being grade versus pipe and becomes a question of where the water can be stored or sent. The catch basin versus dry well decision turns on that same test and the drawdown math behind it.

Regrading is enough more often than the bid sheet suggests

Here's how the four measurements map to a fix. Your market and your soils will shift the edges of this, but the logic holds.

Notice that two of five rows are grading work and one is gutter work. That ratio isn't universal, but it's closer to reality than the assumption that every wet yard call is a pipe job.

Price the regrade properly — it's not the cheap job people assume

Run the dirt volume before you quote. A fill that tapers from seven inches at the house to nothing 35 feet out has an average depth of half the maximum: 3.5 inches, or 0.29 feet. Across 900 square feet that's 900 × 0.29 = 261 cubic feet, divided by 27 = 9.7 cubic yards. Add 10 to 15% for compaction and settlement and you're ordering about 11 yards.

Multiply 11 by your delivered price per yard of screened topsoil, which swings widely with haul distance — a rural yard with a pit ten minutes away and a metro job with a 40-minute round trip are not the same number, so use yours, not a published one. Then add restoration. Nine hundred square feet of sod, or seed, straw and a return visit. Then the machine, the labor at your loaded hourly rate, and the disposal if you're cutting more than you're filling.

Do that honestly and the regrade often lands at 30 to 45% of the pipe quote rather than 10%. That's still a much easier number for a homeowner to say yes to, and it's a real job with real margin. The failure mode is treating grading as a favor you throw in — that's how contractors end up hand-placing eleven yards of soil for the price of a service call.

Five situations where grade alone will never get there

Say these out loud on site when they apply. Naming the constraint in front of the homeowner is what makes the larger number credible later.

• No outfall below the wet spot. If daylight, the street, a swale or a legal tie-in is all at or above the low point, shaping the surface just relocates the puddle.
• The house sits low. When the finished floor is below the surrounding yard, every regrade pushes water toward the building. You're into interception and pipe.
• Water table within about 18 inches. Confirmed by the hole filling from below and staying full. Surface shaping does nothing for a yard that's wet from underneath.
• Hardscape or mature trees lock the elevation. A patio slab, driveway, pool deck or a root flare you can't bury sets a fixed grade you have to work under, not over.
• Concentrated flow, not sheet flow. A neighbor's four downspouts, a street inlet backing up, a roof valley dumping in one place. Once it's a stream, a swale erodes and a pipe is the honest answer.

Quoting the smaller fix is how you win the bigger one

Run the arithmetic with your own close rates — these are illustrative, and you should replace every one of them.

Say you only quote the pipe system at $12,000, and homeowners who called about a wet corner say yes one time in four. Expected revenue per qualified lead: 0.25 × $12,000 = $3,000.

Now say you quote a $3,800 regrade that closes six times in ten, and roughly a third of those customers come back within two seasons for the subsurface work because the yard improved but didn't fully dry. That's 0.6 × $3,800 = $2,280 now, plus 0.6 × 0.33 × $12,000 = $2,376 later. Around $4,650 per lead, and the second job comes from someone who already trusts you and doesn't shop it.

Change the close rates to yours and the conclusion may flip. The point is that the comparison is worth running once a year, and almost nobody runs it.

There's a second effect the math doesn't capture. A homeowner who watched you shoot elevations, explain why the pipe quote was premature, and fix it for a third of the price will tell their neighbors that specific story. That's the referral pattern in drainage work — not "they did good work," but "they told me I didn't need the expensive one."

Put phase two on the proposal, not on a follow-up call

The risk of selling the smaller fix is obvious: sometimes it doesn't fully solve it, and you're the one who recommended it. Handle that in writing on the day you quote, not next April.

Show both paths on one document. Option A is the regrade with the scope stated plainly: this corrects surface pitch and roof discharge, it does not address water entering the soil from below. Option B is the subsurface system, priced, with the note that it's the recommended next step if the yard still holds water after a full wet season. Put the numbers you measured — the fall, the exposed foundation, the depth water appeared in the hole — right in the proposal. That's what makes the second conversation a continuation instead of a cold start. The structure for options on a single proposal matters more here than on almost any other job type.

Then keep the record. In ScapesHQ, the estimate, both options, what was signed and the notes from the site visit sit on the property record, so when that number shows up on the phone next spring you can read back your own measurements before you answer. What ScapesHQ won't do is chase it for you — automated follow-up playbooks aren't built, and neither is job costing, so if you want to know whether your regrades actually beat your pipe jobs on margin, that comparison still lives in your accounting software. Set a calendar reminder for the first heavy rain after the season turns and make the call yourself.

FAQ

How much fall do I need to fix a wet yard by grading alone?

Plan on 1% minimum across open lawn, which is an eighth of an inch per foot, and about 2% for the first ten feet away from a foundation. Multiply the run length by the required drop per foot to get your target, then shoot the actual elevations to see how much of it already exists. If the gap between what you need and what you have can't be made up without burying siding or cutting into a patio, grading alone won't get there.

Will regrading fix a wet yard with heavy clay soil?

It fixes the part of the problem that's surface water sitting in a low spot, and clay yards often have plenty of that. It does nothing for water already perched inside the soil profile, which is what a shovel hole seeping from the sides at eight or ten inches is telling you. On many clay lots the honest answer is that grading removes the ponding and shortens the wet period, but the lawn will still be soft, and the homeowner needs to hear that before they sign.

How much soil can I add against a house foundation?

Measure the exposed foundation first. Most codes want roughly six inches of foundation visible above finished grade, and siding manufacturers generally want four to six inches of clearance, so your available fill is whatever exists above that minimum. If only eight inches of block is showing, you have two to four inches to work with at the wall and you'll need to make up the rest of the fall by cutting at the low end.

Should a regrade be priced much cheaper than a French drain?

Usually cheaper, but not dramatically so once restoration is counted. Run the fill volume — area times average depth, divided by 27, plus 10 to 15% for compaction — then add sod or seed, the machine, disposal and your loaded labor. Done properly a regrade often lands at 30 to 45% of the pipe quote, which is still an easy yes for the homeowner and a profitable day for you.

How long should I wait before recommending the drainage system after a regrade?

One full wet season, so the yard gets tested by the kind of rain that caused the original complaint. Tell the homeowner that timeline on the day you quote, and write the second option and its price on the same proposal. Then set your own reminder for the first heavy rain after the season turns rather than waiting for them to call.

The short version

Before you quote pipe, shoot the fall from the wet spot to your lowest discharge point, measure exposed foundation at the house, dig a shovel hole 12 to 18 inches deep and watch where water enters it, and calculate roof volume at 0.623 gallons per square foot per inch of rain. Water sitting on top of the ground with somewhere downhill to go is a grading job; water entering the hole from the sides is a pipe job. Price the regrade properly including fill volume and restoration, put both options on one proposal with the measurements written into it, and let the smaller fix earn you the bigger one.

Book a walkthrough and we'll put one of your own wet-yard jobs on the screen with the regrade option and the pipe option side by side.