2026 cost guide · updated August 2026
Crawl Space Waterproofing Cost in Metro Atlanta
Crawl Space Waterproofing costs $3,200 to $12,500 in Metro Atlanta, or $45 to $95 per linear foot of interior perimeter drain. An interior perimeter drain around 110 linear feet with a sealed sump basin, a 1/3 horsepower pump and a discharge line typically runs $6,500 to $10,000 in Metro Atlanta.
Line-item pricing
| Line item | Low | High | Unit |
|---|---|---|---|
| Interior perimeter drain, perforated pipe in washed stone | $45 | $95 | linear ft |
| Sealed sump basin with 1/3 hp pump and check valve | $1,200 | $2,600 | each |
| Battery backup sump pump | $700 | $1,600 | each |
| Discharge line to daylight, trenched | $18 | $42 | linear ft |
| Exterior downspout extension and splash correction | $120 | $400 | per downspout |
| Exterior regrading at the foundation | $8 | $22 | linear ft |
| Foundation wall crack sealing | $350 | $900 | per crack |
What underpriced waterproofing quotes leave out
- A battery backup pump, on lots where the storm that floods also drops power
- Discharge line length to a point genuinely clear of the foundation
- The land disturbance permit exterior excavation can trigger
- Whether exterior grading would solve it for a tenth of the price
- Spoil removal from a low-clearance crawl space, which is hand-and-bucket work
Estimate your project
This calculator uses the same published line items and city factors shown on this page. Nothing is hidden behind a form, and it does not ask for your contact details.
- Crawl Space Waterproofing
- $3,400 – $13,100
- Grading and downspout correction
- n/a
- Planning range
- $3,400 – $13,100
- Atlanta factor: +5%. Intown access constraints and street parking add crew time
- Standing water means drainage is installed before any liner. Sealing a wet crawl space traps the water.
This is a planning estimate built from the same published line items shown elsewhere on this site. It is not a quote. The binding number comes from an on-site measurement.
What drives the price
Waterproofing is the crawl space service most often bought before it is needed and most often skipped when it is. The distinguishing question is not how wet the crawl space looks but when the water arrives. Water that appears during or immediately after rain is surface water and roof water, and it is corrected with gutter work, downspout extensions and regrading for $600 to $2,500.
Water that appears on dry days is groundwater, and no amount of exterior grading affects it: it needs interior perimeter drainage bedded in washed stone, tied to a sealed sump, at $45 to $95 a linear foot plus $1,200 to $2,600 for the basin and pump. Metro Atlanta has entire neighbourhoods in each category, which is why the diagnosis precedes the quote.
- Linear feet of perimeter drain required
- Whether the soil is Cecil clay, which trenches slowly, or sandy alluvium
- Sump pump capacity, battery backup, and discharge routing distance
- Whether exterior grading and downspout extension can solve part of the problem more cheaply
- Shallow bedrock, which prevents exterior drainage entirely in places like Stone Mountain and Smoke Rise
The cheaper option worth considering first
Before commissioning any drainage system, spend $400 on gutter cleaning, downspout extensions and a splash-block correction, then watch the crawl space through one wet week. On the ridge lots across North Fulton and East Cobb that is frequently the entire fix. It is the cheapest test available and it costs less than the inspection fee many companies charge.
We publish this because the alternative is frequently the right purchase, and because a company that only ever recommends its largest package is not diagnosing anything. Crawl Space Waterproofing service details covers when each approach applies.
Crawl Space Waterproofing cost by Metro Atlanta city
Each city’s factor reflects a documented physical or procedural condition: clearance height, soil and hydrology, permitting process, or drive time. It is not local property values.
| City | Typical low | Typical high | Factor | Main reason |
|---|---|---|---|---|
| Alpharetta | $3,100 | $12,100 | -3% | Generous 36 to 48 inch clearance makes crews efficient |
| Kennesaw | $3,100 | $12,000 | -4% | Newer 1990s and 2000s stem-wall construction with excellent clearance |
| Marietta | $3,200 | $12,500 | metro avg | Straightforward suburban access on most East Cobb lots |
| Dunwoody | $3,200 | $12,500 | metro avg | Standard suburban access and clearance |
| Peachtree Corners | $3,200 | $12,400 | -1% | Consistent stem-wall construction with good access |
| Tucker | $3,300 | $13,000 | +4% | Shallow granite on the eastern slopes forces interior drainage over cheaper exterior options |
| Chamblee | $3,300 | $12,900 | +3% | Slab-to-crawl transition detailing adds scope |
| Mableton | $3,300 | $12,800 | +2% | Low clearance in the older Riverline stock |
| Lilburn | $3,300 | $12,800 | +2% | Split-foyer crawl spaces need sealing at the finished-space boundary |
| Douglasville | $3,300 | $12,900 | +3% | Septic drain fields constrain discharge routing and sometimes force longer runs |
| East Point | $3,300 | $13,000 | +4% | Deferred maintenance on century-old piers frequently expands scope once opened |
| Atlanta | $3,400 | $13,100 | +5% | Intown access constraints and street parking add crew time |
| Sandy Springs | $3,400 | $13,300 | +6% | Steep lots complicate material handling and discharge routing |
| Decatur | $3,400 | $13,400 | +7% | Tree ordinance review can push exterior drainage into a costlier interior solution |
| Norcross | $3,400 | $13,300 | +6% | Century-old sills and piers in the historic district need careful shoring |
| Acworth | $3,400 | $13,100 | +5% | Seasonal Allatoona pool movement means sumps are sized on the seasonal high, not the inspection-day condition |
| Roswell | $3,500 | $13,500 | +8% | Chattahoochee corridor lots typically need drainage before any barrier work |
| Brookhaven | $3,500 | $13,600 | +9% | 18 to 28 inch clearance in the cottage neighborhoods raises labor hours |
| Stone Mountain | $3,500 | $13,800 | +10% | Shallow bedrock makes exterior drainage impractical, pushing work to costlier interior systems |
| Smyrna | $3,600 | $14,000 | +12% | Clearance under 24 inches on much of the older stock raises labor hours substantially |
City pages for this service
Methodology and sources
These ranges are a planning model built for this site, not a survey of what other contractors charge. It has three inputs. Material quantities are taken off a reference 1,400 square foot crawl space with 150 linear feet of foundation wall, priced at Metro Atlanta supplier list rates. Labour hours are costed against Bureau of Labor Statistics wage data for the Atlanta metropolitan area, where the mean hourly wage was $34.57 in May 2025. Permit fees come from the published schedules of the jurisdictions listed on this site.
- U.S. Bureau of Labor Statistics: Occupational Employment and Wages, Atlanta-Sandy Springs-Roswell, May 2025
- U.S. Department of Energy, Building America: Unvented, Conditioned Crawlspaces
- U.S. Department of Energy, Building America Solution Center: Unvented, Insulated Crawlspaces
- Georgia Department of Agriculture: IRC Section R408 Under-Floor Space, as applied in Georgia
- Georgia Structural Pest Control Commission Notice 14-08: Under-Floor Space Ventilation Fact Sheet
- U.S. EPA: A Brief Guide to Mold, Moisture and Your Home
Benchmark: Our model puts a complete Metro Atlanta encapsulation at $5 to $7 per square foot. Nationally published ranges are wider, roughly $3 to $10, because they average markets with very different soil, humidity and labour conditions. Georgia sits in the upper-middle of that spread for a specific reason: roughly 50 inches of annual rain and summer dew points above 65F mean a Metro Atlanta crawl space almost always needs the dehumidifier, which markets in dry climates can often skip.
Crawl Space Waterproofing cost: common questions
How much does waterproofing cost in Metro Atlanta?
Crawl Space Waterproofing runs $3,200 to $12,500 in Metro Atlanta. An interior perimeter drain around 110 linear feet with a sealed sump basin, a 1/3 horsepower pump and a discharge line typically runs $6,500 to $10,000 in Metro Atlanta. Per-unit pricing runs $45 to $95 per linear foot of interior perimeter drain.
Why do waterproofing quotes vary so much?
The three variables that move the number most are linear feet of perimeter drain required, whether the soil is cecil clay, which trenches slowly, or sandy alluvium, sump pump capacity, battery backup, and discharge routing distance. A quote that is far below the ranges here has usually omitted one component of the complete system, and it is fair to ask which.
Does waterproofing need a permit in Metro Atlanta?
Interior drainage and sump installation usually needs an electrical permit for the pump circuit. Exterior excavation frequently triggers a land disturbance permit, and Norcross specifically requires one.
How long does waterproofing take?
2 to 4 days on site. Add permit lead time where a building or electrical permit applies, and add time where water has to be intercepted before the main work can begin.
Are these prices quotes?
No. These ranges are a planning model built for this site, not a survey of what other contractors charge. It has three inputs. Material quantities are taken off a reference 1,400 square foot crawl space with 150 linear feet of foundation wall, priced at Metro Atlanta supplier list rates. Labour hours are costed against Bureau of Labor Statistics wage data for the Atlanta metropolitan area, where the mean hourly wage was $34.57 in May 2025. Permit fees come from the published schedules of the jurisdictions listed on this site.
Is there a cheaper alternative to waterproofing?
Before commissioning any drainage system, spend $400 on gutter cleaning, downspout extensions and a splash-block correction, then watch the crawl space through one wet week. On the ridge lots across North Fulton and East Cobb that is frequently the entire fix. It is the cheapest test available and it costs less than the inspection fee many companies charge.
What do cheap waterproofing quotes leave out?
Most commonly: a battery backup pump, on lots where the storm that floods also drops power; discharge line length to a point genuinely clear of the foundation; the land disturbance permit exterior excavation can trigger. If a quote sits well below the ranges on this page, ask the contractor which of those it excludes.
Related: Crawl Space Waterproofing service details · 2026 Metro Atlanta cost report · Permit guide · All cost guides
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