Deck footing excavation typically costs $75 to $200 per footing hole for standard residential deck footings, depending on required depth, soil conditions, and number of footings needed. Treat every figure on this page as a starting point rather than a quote: footing depth is set by the local frost line and building code, not by how the deck looks or how deep seems reasonable, and this is one of the more strictly inspected parts of a deck-building project.
A deck footing has to extend below the frost line so seasonal freezing and thawing of the soil doesn't heave the footing and, with it, the whole deck structure over time. This depth varies considerably by region and is one of the first things confirmed with the local building department before footing locations are even marked.
What actually drives the price
Required depth is the single biggest factor, and it varies a lot by climate. Regions with deep frost penetration need significantly deeper footings than milder climates, which means more excavation per footing and sometimes different equipment than a shallow footing would require.
Number and spacing of footings depend on the deck's size and design, set by the structural plan, so a larger or more elaborate deck with more support points means more individual footing excavations, each needing to meet the same depth and diameter requirements.
Soil and rock conditions matter directly, since encountering rock or extremely compacted soil at or above the required footing depth means additional work to reach code depth, sometimes requiring different tools than standard footing excavation.
Access for equipment affects cost on tighter residential lots, since footing excavation sometimes happens with a small excavator or auger attachment, and a site with obstacles or narrow access may require more manual excavation instead, which takes longer.
Inspection requirements
Most jurisdictions require an inspection of footing excavations before concrete is poured, to confirm depth and diameter meet code. Confirm this inspection is scheduled as part of your project timeline, since pouring before a required inspection often means the work has to be redone.
A short checklist before you book
Confirm required footing depth with your local building department before excavation. Confirm the number and spacing of footings match your structural deck plan. Assess soil conditions for rock or heavy compaction that could affect depth. Check access for excavation equipment on your specific lot. Confirm inspection timing before concrete is scheduled to be poured.
Costs vary by site conditions. Use the ranges here to sanity-check what you're quoted, then get a direct price for your own property.
Submit Your Project — Free, Direct Access to Operators on Pro Operator Network.