Finance

What is a variance in construction?

Variance has two everyday meanings in construction. On the cost side, it is the difference between what was budgeted and what actually happened. On the permitting side, a zoning variance is official permission to depart from a zoning rule on one property.

Two construction professionals review paper plans beside a tablet at a jobsite workbench.
Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

Most contractors use variance in the job cost sense: the budget said $42,000 for framing labor, actual cost came in at $47,500, so the variance is $5,500 unfavorable. Owners, developers, and architects also use it in the zoning sense, as in "we need a variance for the side setback." Context usually makes it obvious which one is meant. Both can move a project's money and schedule.

Cost variance on a job

A cost variance compares a budget line with actual or projected cost. It is reported by cost code so the project manager can see exactly where a job is gaining or losing money. Favorable means under budget; unfavorable means over.

Cost variance report, month four (example)
Cost codeBudgetActual to dateProjected finalVariance at completion
Excavation$60,000$58,200$58,200$1,800 favorable
Concrete foundations$145,000$121,000$152,000$7,000 unfavorable
Rough framing labor$88,000$40,000$94,000$6,000 unfavorable
Framing material$112,000$109,000$110,500$1,500 favorable

Notice the comparison that matters is budget versus projected final, not budget versus actual to date. Concrete has spent $121,000 of a $145,000 budget, which looks fine until the PM projects $31,000 more to finish. That is why variance reporting depends on an honest cost to complete.

  • Price variance: the unit cost changed, such as lumber costing more than estimated.
  • Quantity variance: more material or hours were used than the takeoff assumed.
  • Productivity variance: crews installed fewer units per hour than planned.
  • Scope variance: the work changed. This one should become a change order, not a loss.

For tracking across the whole company, see budget variance and the job cost report.

Zoning variance

A zoning variance is a property-specific exception to a zoning ordinance, such as a reduced setback, extra height, or less parking than the code requires. It is usually granted by a local board of zoning appeals or similar body after an application and a public hearing, and many jurisdictions require the applicant to show a hardship caused by the property itself rather than by the owner's plans. Rules and standards vary by city and county, so check with the local planning department. See zoning.

For a contractor, a pending variance is a schedule risk. Say a builder is pricing a small infill duplex where the lot is 4 feet too narrow for the side setbacks. The owner needs a variance before the building permit can issue. If the hearing is two months out, the start date in the contract should depend on approval, not on a calendar date.

Common mistakes

  1. Reviewing cost variance only at job end, when nothing can be fixed.
  2. Treating scope changes as cost overruns instead of pricing them as changes.
  3. Signing a fixed start date on a job that still needs a zoning variance or other approval.
  4. Reporting variance against actual to date instead of projected final cost.

Related terms

Cost variance is a core part of job costing, earned value, and the monthly WIP review. For a routine, see how to run a weekly job cost review and how to find margin fade on construction projects. Smart Business Automator shows budget, committed, actual, and projected cost by cost code so variances show up while there is still time to act; see job costing and WIP automation.

Frequently asked questions

What is a favorable variance in construction?

A cost line that is projected to finish under its budget. An unfavorable variance is projected to finish over budget.

How often should cost variances be reviewed?

Most contractors review them at least monthly with the WIP, and many review active jobs weekly so problems surface while there is time to act.

Who grants a zoning variance?

Usually a local board of zoning appeals, board of adjustment, or similar body, after a public hearing. The process and standards are set by local and state law.

Is a variance the same as a special use permit?

No. A variance relaxes a specific rule, like a setback or height limit. A special or conditional use permit allows a use the zoning district permits only with approval.

Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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