Concrete Footing Takeoff: The Complete Guide (2026)

Footing subcontractors live and die by one number per job: total linear feet of footing. Get it right and the invoice matches the work. Get it wrong and you either gave away concrete and labor for free or you’re arguing with a wall company over a plan neither of you wants to re-measure.

This guide walks through the takeoff exactly the way it’s done on real residential plans — the same process whether you do it with a calculator at the kitchen table or check an automated takeoff before sending the invoice.

What you’re actually measuring

Concrete footings are the widened base — commonly 6 inches thick and 18 to 24 inches wide in residential work — poured under every concrete foundation wall. The wall (typically 8–10 inches wide) is formed and poured on top of the footing by the wall crew.

Because the footing follows the wall, the footing takeoff is a wall-line takeoff. You are measuring the plan’s foundation wall layout, not hunting for separately drawn footings. On most residential foundation plans the footing is only shown as a dashed line offset around the walls, if it’s shown at all.

Two quantities come out of the takeoff:

1. Linear feet (LF) of footing — the total length of every footing run.
2. Pad count — the number of isolated interior pads (pier pads) under posts and columns.

That’s the whole invoice for most footing subs: LF × rate plus pads × flat rate, with a higher LF rate when rebar goes in.

Step 1: Find the right page and the right lines

On a full permit set, the footing information lives on the foundation plan (often labeled S1, A1, or “Foundation/Basement Plan”). Confirm three things before measuring anything:

• Scale — usually 1/4” = 1’-0” on residential foundation plans, but never assume; the title block tells you.
• Wall schedule — which lines are concrete foundation walls (your scope) versus wood-frame walls (usually not your scope). Foundation walls are typically drawn as double lines with a thickness call-out (10” is common for basement walls, 8” for porch and cold-room walls).
• Margin notes — many wall companies hand-write the job address, total footage, rebar requirements, or pad counts in the margins. Read these first. When a handwritten total exists, it’s the number your takeoff has to reconcile with.

Step 2: Measure the perimeter out-to-out

Start with the outer perimeter, and measure it out-to-out — along the outside face of the foundation walls. Residential dimension strings are almost always given to the outside face of the foundation wall, so the perimeter is usually a clean chain of printed dimensions you can add without scaling anything.

Two rules keep the perimeter honest:

• Opposite sides must agree. The sum of the segments along the north side must equal the south side (and east must equal west) on a closed rectangle-ish plan. If they don’t, you misread a dimension — find it now, not after the pour.
• Jogs count twice. Every bump-out or step in the perimeter adds two short runs (in and out). These 2-and-3-footers are exactly what gets missed at 11 p.m. with a calculator.

Step 3: Add interior foundation-wall runs

Interior concrete foundation walls — under beam lines, between garage and basement, around cold rooms and porches — get footings too. Measure each interior run and add it to the total.

Watch the dimension convention flip: exterior dimensions run to the outside of walls, but interior chains typically run between inside faces. When an interior dimension string doesn’t visibly close against the perimeter, that’s usually why.

What you generally don’t include (billing conventions vary — confirm yours):

• Wood-frame load-bearing wall strips — some plans call for a shallow strip footing (e.g. 16” × 6”) under interior wood walls. Many footing subs exclude these from the concrete-wall LF total or bill them separately.
• Window wells, wing walls, and short decorative stubs — frequently excluded or negotiated.
• The pads — counted separately, never as linear feet.

Whatever your convention, apply it identically on every job — inconsistency is what turns a month-end invoice into a dispute.

Step 4: Count the pads

Interior support pads carry the posts that hold the main beam. On the plan they appear as small squares (often dashed) along the beam line, usually 38”×38” up to 46”×46” and 12–19 inches deep, sometimes with a size schedule.

Count them, note any size call-outs, and bill them as units. If the plan shows a beam line with posts but no pads drawn, that’s a flag to raise with the wall company — not a guess to make silently.

Step 5: Reconcile and sanity-check

Before the total goes on an invoice:

• Compare against the handwritten total if the wall company provided one. Agreement within a couple of feet is normal (rounding); a 20-foot gap means someone missed a run.
• Sanity-check the magnitude. A typical detached house runs 250–350 LF of footing. A townhouse unit runs less; a large custom home more. A number far outside the band deserves a re-measure.
• Check the rebar call. Rebar often isn’t on residential plans at all — it’s decided at the site. If your rate changes with rebar (commonly +$0.50/LF), confirm before invoicing, not after.

Where manual takeoffs go wrong

Across real plans, the recurring errors are remarkably consistent:

Every one of these is invisible in a final total. That’s the core problem with hand takeoffs: the number carries no evidence. A takeoff you can see — every run drawn on the plan with its length — is auditable by anyone in thirty seconds.

Manual vs. automated footing takeoff

The manual process above works and has worked for decades. Its cost is time and silence: 20–40 minutes per plan and errors that don’t announce themselves.

FootingTakeoff automates exactly this workflow — perimeter out-to-out, interior runs, pad counting, margin-note reconciliation — and returns the takeoff as an overlay on your plan with every run labeled, uncertain segments flagged in red, and the total already priced at your $/LF and $/pad rates. You review the flags instead of re-measuring the plan.

Either way, the discipline is the same: measure the walls, respect the conventions, reconcile the total, and never send a number you can’t point to on the plan.