Concrete Footing Cost Calculator

In 2026, concrete footings typically cost $5 to $25 per linear foot installed, so a standard residential strip footing around a 150-foot foundation perimeter often runs about $1,500 to $3,500. The price depends on the footing size (a standard 16x8 footing is cheapest; heavy or deep frost-depth footings cost more), the reinforcement (plain concrete vs standard or engineered rebar), the soil conditions, and how the trench is excavated. Footings are a relatively small part of a total foundation cost but a critical structural one. Larger structural footings, difficult soil, rocky digging, and tight hand-dug access all push the per-foot cost toward the higher end.

A concrete footing is the wide, reinforced concrete base that sits below a foundation wall, column, post, or other structure and spreads the building's load out onto the soil. Because it's wider than the wall it supports, it distributes weight over a larger area so the structure doesn't sink, settle unevenly, or crack. Footings are poured at the bottom of an excavated trench (or hole, for isolated pier footings) and must reach stable, undisturbed soil and, in cold climates, extend below the frost line so freezing ground doesn't heave them. Virtually every permanent structure — houses, additions, garages, decks, retaining walls, and fences carrying significant load — relies on properly sized and placed footings for structural stability.

They work together but aren't the same thing. The footing is the wide concrete base at the very bottom that contacts and spreads load onto the soil; the foundation (such as a foundation wall, stem wall, or slab) sits on top of the footing and supports the structure above. Think of the footing as the 'feet' and the foundation wall as the 'legs.' A footing is typically poured first in a trench, then the foundation wall is built or poured on top of it. This calculator estimates the footings specifically — the excavation, forming, reinforcement, and concrete for the strip footing — which is one component of a complete foundation. Full foundation walls, slabs, or basements are separate, larger scopes.

Footing depth is governed by two main factors: reaching stable, undisturbed soil and getting below the frost line. In cold climates, footings must extend below the local frost depth — which can range from a foot or so in mild areas to four feet or more in the far north — so that freezing and thawing ground doesn't push the footing up and crack the structure (frost heave). They also must bear on firm, load-bearing soil, not loose fill or topsoil. Local building codes specify minimum footing depths and dimensions for your area, and an engineer may be required for unusual soils or heavy loads. This is why a deep frost-depth footing costs more than a shallow one — there's far more excavation and concrete involved. Always build to your local code's required depth.

It depends on the application and local code. Many residential strip footings are reinforced with rebar (typically two or more horizontal bars running the length of the footing) to add tensile strength, help the footing span minor soft spots in the soil, and resist cracking — and code often requires it, especially for larger footings, poorer soils, or seismic areas. Some small, lightly-loaded footings on very good soil may be allowed as plain concrete. Heavier structural footings and those carrying concentrated loads use more or engineered reinforcement. Rebar is inexpensive relative to the cost of a footing failure, so it's commonly included. This calculator lets you choose none, standard rebar, or engineered reinforcement so the estimate matches your project's requirements. Follow your local code and any engineer's specifications.

Footing size (width and thickness) is determined by the load it carries and the soil's bearing capacity. A common residential strip footing for a one- or two-story home is roughly 16-20 inches wide and 8 inches thick, but heavier structures, weaker soils, or concentrated loads call for wider and thicker footings to spread the load adequately. As a general rule, the footing should be about twice the width of the wall it supports, but the precise size should come from the building code's prescriptive tables or, for non-standard situations, an engineer's calculation based on your soil and loads. Undersized footings can lead to settling and cracking, while oversized ones waste money. This calculator offers standard, heavy, and frost-depth options to reflect different size requirements.

Usually yes — when a contractor quotes a full foundation, the footings are typically part of that scope, poured first as the base for the walls or slab. However, if you're pricing footings on their own — for a deck, a retaining wall, a fence, a porch, a room addition tying into an existing structure, or a standalone structural element — the footings are quoted separately, which is what this calculator estimates. It's always worth clarifying with your contractor whether a foundation bid includes the footings, the excavation, reinforcement, and any required drainage, since these can sometimes be listed separately. Knowing the per-linear-foot footing cost helps you understand and compare quotes for the structural base of any project.

For a typical residential project, excavating, forming, reinforcing, and pouring the footings often takes just 1 to 3 days of on-site work, depending on the length and complexity. The trench is dug to the required depth, forms are set where needed and reinforcement placed, an inspector usually checks the trench and rebar before the pour, and then the concrete is placed and finished. After pouring, the concrete needs to cure — it's typically firm enough to build on within a few days, though it continues gaining strength for about 28 days. Difficult soil, rocky excavation, deep frost footings, tight hand-dug access, and weather can extend the timeline. The footing pour is an early, foundational step, so getting it right and properly inspected is well worth the time.