BASEMENT EXCAVATION · LAKE OCONEE & LAKE SINCLAIR
Get a free estimate
or call (678) 863-5620The short answer
Basement excavation removes several hundred cubic yards of soil, about 300 for a 1,000-square-foot basement, to make room for footings and walls, plus working space around them. On sloped Lake Oconee and Lake Sinclair lots it usually means a walkout dug into the hill, planned around Piedmont clay, shallow rock, winter groundwater and Georgia Power's shoreline setbacks.
Reviewed by A Class Septic Services · Last updated
Who does the work
One crew, raw ground to a working system
Key facts
Each row links to the agency, code or publisher it comes from. Tap a source to check it yourself.
| Topic | What it says | Source |
|---|---|---|
| How much dirt | About 300 cubic yards of excavation for a 1,000-square-foot basement. | This Old House: Cost to Dig Out a Basement (2026 Guide, updated 04/01/2026), 2026 |
| Excavation rate | $75 to $150 per cubic yard of dirt (typical market range, This Old House 2026 and Bob Vila 2024). | Same source as above |
| New-construction basement dig | $10,000 to $30,000 (typical market range, Bob Vila 2024). | Bob Vila: How Much Does It Cost to Dig Out a Basement? (updated Feb 1, 2024), 2024 |
| Rocky or hard-to-reach sites | $30,000 to $50,000+ for basement or crawl space excavation (Bob Vila 2023). | Bob Vila: How Much Does Excavation Cost? (updated July 25, 2023), 2023 |
| Foundation drains | IRC R405.1 requires drains around concrete or masonry foundations that retain earth and enclose habitable or usable space below grade, except on well-drained soils. | InterNACHI: Inspecting Foundation Drainage for Below-Grade Spaces (IRC R405) |
| Lake Sinclair setback | New construction must be outside the project boundary and at least 75 feet from the shoreline; dwellings are limited to two stories above ground. | Georgia Power: Lake Sinclair Dwellings and Additions guidelines, 2023 |
| Cave-in rule | Excavations 5 feet deep or more need sloping, benching, shoring or shielding where workers enter, unless cut in stable rock. | OSHA Fact Sheet FS-3476: Trenching and Excavation Safety, 2011 |
| Before digging | Georgia 811 ticket at least 3 business days ahead. | Georgia 811: The 811 Process, 2026 |
Plain definitions
The whole story
A lot that drops toward Lake Oconee or Lake Sinclair practically designs its own foundation. Cut the house into the hill and the downhill side opens to the view at grade, with doors to a patio and the path to the dock. On Lake Sinclair leased lots it matters for another reason: Georgia Power limits dwellings to two stories above ground (Georgia Power, Lake Sinclair), so living space below the upper floors is how many owners get the room they want.
The same rules govern where the hole can go. New construction there has to sit outside the project boundary and at least 75 feet from the shoreline, or farther if the county setback is greater, and the septic system with its repair area has to fit on the lot without disturbing the project boundary. If the house and septic don't fit, Georgia Power says the dwelling should be modified. We lay out the basement after the septic area is fixed, not before.
The ground under that hole varies a lot. A Davidson or Cecil soil can be clay or saprolite well past basement depth, which digs cleanly (Davidson). A Wilkes soil on a ridge can reach hard bedrock around 40 to 60 inches, right at footing depth (Wilkes). A Helena soil may hold a perched water table 18 to 30 inches down from January to April (Helena), which means a winter basement dig can fill with water overnight. A test pit with the machine before the price is set is cheap insurance against all three.
There's also the plumbing to think about. A basement bathroom sits lower than everything else in the house, and often lower than the inlet of a septic tank that was placed downhill toward the lake. Fixtures that can't drain by gravity need a pump, so the basement floor elevation, the sewer exit and the septic pump system should be decided together before we dig.
How the job runs
Corners, finished floor height and footing depth from the builder's plans, with over-dig added on every side. On a walkout, we also set the daylight line where the floor meets the slope.
Building permit in hand, Georgia Power approvals on lake lots, county land disturbance permit if the work is within 200 feet of the lake's bank or disturbs an acre. Then the 811 ticket.
O.C.G.A. § 12-7-17, Exemptions, Georgia Erosion and Sedimentation Act (text via Onecle)
Silt fence below the dig and the stockpile, a stone entrance for trucks, and a plan for where 300-plus cubic yards of soil will go.
O.C.G.A. § 12-7-6, Best management practices; minimum requirements (text via Onecle)
Topsoil is saved separately. The main hole comes out to subgrade, with spoil kept for backfill and the rest loaded out or spread as fill elsewhere on the lot.
Cut faces are sloped or benched so crews can work at the footings. Excavations are checked after rain, when clay walls weaken.
Footing trenches are cut to the depth and width on the plans. Rock at footing grade is removed or the footing is stepped, as the builder's engineer directs.
Groundwater or rain in the hole is pumped out and the floor kept dry for footings. Foundation drains are set at or below footing level, bedded in washed stone.
InterNACHI: Inspecting Foundation Drainage for Below-Grade Spaces (IRC R405)
Once walls are waterproofed, drains are in and the builder says the walls are braced, we backfill in compacted lifts and shape the grade to fall away from the house.
Permits & the Georgia rules
County building permit for the house, with the foundation design the dig must match.↗
On a Lake Sinclair leased lot, Georgia Power's review package: architectural drawings, a site plan with the county-approved septic tank, drain field and well, the septic and building permits, and a land disturbing permit if over 1 acre.↗
A county land disturbance permit where the work disturbs an acre or more or falls within 200 feet of the bank of state waters, which on lake lots it often does.↗
A Georgia 811 locate ticket at least 3 business days before excavation starts.↗
Georgia rule Georgia Power, Lake Sinclair dwellings
“All new construction must be outside of the project boundary and at least 75’ from the shoreline.”
Georgia rule Georgia Power, Lake Oconee guidelines
“No structures are permissible inside of the Georgia Power’s project boundary other than permitted and approved shoreline structures.”
Georgia rule O.C.G.A. 12-7-6(b)(6)
“Disturbed soil shall be stabilized as quickly as practicable.”
Your options
OPTION 01
When it fits: Lots that fall 8 feet or more across the house footprint, which describes most lake lots.
OPTION 02
When it fits: Flat or gently sloped lots away from the shoreline where all walls will be below grade.
OPTION 03
When it fits: Shallow rock, high winter water, tight budgets or lots where the setback leaves no room for a deeper dig.
What it costs
Basement excavation, new construction
$10,000–$30,000
per project
Typical market range — Bob Vila: How Much Does It Cost to Dig Out a Basement? (updated Feb 1, 2024), 2024
Excavation rate
$75–$150
per cubic yard
Typical market range — This Old House: Cost to Dig Out a Basement (2026 Guide, updated 04/01/2026), 2026
Basement or crawl space excavation
$1,500–$30,000
per project
Bob Vila: $30,000 to $50,000+ in rocky or hard-to-reach areas.
Typical market range — Bob Vila: How Much Does Excavation Cost? (updated July 25, 2023), 2023
Basements and waterproofing
$5,000–$15,000
per project
Typical market range — HomeAdvisor: How Much Does Excavation Cost in 2026? (updated June 20, 2026), 2026
Dirt hauling and removal
$8–$25
per cubic yard
Typical market range — HomeAdvisor: How Much Does Excavation Cost in 2026? (updated June 20, 2026), 2026
Dirt hauling (higher-cost markets)
$140–$230
per cubic yard
Bob Vila: $1,400 to $2,300 per dump truck load.
Typical market range — Bob Vila: How Much Does Excavation Cost? (updated July 25, 2023), 2023
Rock blasting
$40–$100
per cubic yard
Typical market range — HomeAdvisor: How Much Does Excavation Cost in 2026? (updated June 20, 2026), 2026
National cost-guide ranges, dated by year, meant to help you budget rather than to stand in for a quote from A Class Septic Services. For a free estimate on your basement dig, call (678) 863-5620.
Free estimate: (678) 863-5620Where we do this
FAQ
Straight answers, with the rule or record behind them. Still unsure? Call and ask the crew that digs.
(678) 863-5620Bob Vila's 2024 guide puts basement excavation for new construction at $10,000 to $30,000, and This Old House lists $75 to $150 per cubic yard of dirt. Rocky or hard-to-reach sites can run $30,000 to $50,000 or more. These are national typical ranges, not quotes.
Source: Bob Vila: How Much Does It Cost to Dig Out a Basement? (updated Feb 1, 2024)
This Old House estimates about 300 cubic yards for a 1,000-square-foot basement. HomeAdvisor puts standard delivery loads at up to 15 cubic yards, so that is roughly 20 loads if none of it stays on site, which is why balancing spoil on the lot matters.
Source: This Old House: Cost to Dig Out a Basement (2026 Guide, updated 04/01/2026)
On sloped lots it usually is: the downhill wall opens at grade, less soil comes out, and water can drain to daylight. On Lake Sinclair leased lots, where Georgia Power limits dwellings to two stories above ground, a walkout lower level adds living space within that rule.
Source: Georgia Power: Lake Sinclair Dwellings and Additions guidelines
Soft, weathered rock can usually be ripped. Hard rock may need a hammer, and blasting runs $40 to $100 per cubic yard per HomeAdvisor. Some Piedmont soils such as Wilkes reach hard bedrock 40 to 60 inches down, so a test pit before pricing is worth it.
Source: USDA NRCS Official Series Description: Wilkes series
Under IRC R405.1, drains are required around concrete or masonry foundations that retain earth and enclose habitable or usable space below grade, unless the foundation sits on well-drained or sand-gravel soils. Piedmont clay is rarely that, so plan on drains at or below footing level.
Source: InterNACHI: Inspecting Foundation Drainage for Below-Grade Spaces (IRC R405)
At Lake Sinclair, Georgia Power requires all new construction to be outside the project boundary and at least 75 feet from the shoreline, or farther if the county setback is greater. At Lake Oconee, nothing can be built inside the project boundary except permitted shoreline structures.
Source: Georgia Power: Lake Sinclair Dwellings and Additions guidelines
Only if it is above the tank inlet with enough fall. Basement fixtures that sit lower need a pump to lift wastewater to the tank, which is common on lake lots where the house steps down the hill. Decide floor elevation and septic layout together.
They do: A Class Septic Services takes 10% off for military members and first responders. Bring it up when you call (678) 863-5620.
Keep going
Excavation & Site Work
Sources
Rules, costs and local facts on this page link to the agency, code or publisher that states them. Cost figures are third-party market ranges, not our prices — estimates are free.
Reviewed by A Class Septic Services · Last updated
Ready when you are
Most lake lots slope toward the water, which makes a walkout basement the natural foundation. We dig the hole, the over-dig and the footing lines, deal with clay, rock and winter water, and backfill against finished walls in compacted lifts.
(678) 863-5620Free estimate
or call (678) 863-5620