How Much Does Foundation Underpinning Cost?
Foundation underpinning typically costs $1,000 to $3,000 per pier, with most residential projects running $10,000 to $40,000 total. Push piers and helical piers are the common methods. Cost depends on the number of piers, depth to competent soil, access constraints, and engineering and permits — which add $2,000 to $5,000 on top of the contractor's price.
Best price · Quotes back fast · PE stamps backed by Apex Grid Engineering
When underpinning is needed
Underpinning is prescribed when a foundation has settled differentially — doors racking, stair-step cracks in masonry, floors sloping — and the cause is inadequate bearing (fill, expansive clay, or soil that was never competent). Cosmetic cracks from normal shrinkage do not need piers. A structural engineer should diagnose the cause before any contractor sells you piers; the wrong fix on the wrong problem wastes the entire budget.
Pier types and how they are priced
Push piers (resistance piers) are hydraulically driven to refusal or bedrock using the building's weight as reaction — best where a firm bearing stratum exists at depth. Helical piers are screwed in and work better in lighter structures and variable soils. Both are priced per pier installed, and the count comes from the engineer's repair plan, not the contractor's estimate. Expect 8-20 piers on a typical settled corner.
Engineering, permits, and sequencing
The engineer's scope ($2,000-$5,000) covers the forensic evaluation, pier layout and depths, a repair plan with details, and construction observation of the pier installation and load testing. Most jurisdictions require a permit for underpinning. Sequence matters: fix drainage and plumbing leaks first (water is the usual culprit), then underpin, then repair finishes — doing it backwards guarantees repeat work.
The bottom line
Budget $1,000-$3,000 per pier plus $2,000-$5,000 for engineering and permits. Get the engineer's diagnosis before the contractor's bid — and fix the water problem first.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.