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How to budget a contingency for a home project

Every remodel and many repairs find something nobody priced. A contingency is the money you set aside for it, decided before the walls come open.

Updated
2026-10-05
Reading time
3 min
Written by
casaq editorial
Expert review
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Statute checked
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The short answer

There is no official contingency percentage. A practical way to size one: look at how widely owners’ reported costs vary for the job (wide spread, bigger contingency), add more for older houses and for work that opens walls, floors or roofs, and read how the contract prices changes. Keep the contingency separate and spend it only through written change orders.

Use the spread of what owners paid

The American Housing Survey shows how much costs vary by job [1]. For hired jobs in 2023, the 75th percentile was about 2.2× the 25th for water heaters, 2.5× for roofing, 3.7× for bathroom remodels and 5.0× for kitchen remodels [1]. Much of that spread is scope (a vanity swap and a gut renovation are both “bathroom remodels”), but it also signals how much these jobs tend to grow.

A like-for-like swap with a fixed scope (a water heater, a condenser) needs little contingency. Remodels and anything that opens up the structure need more.

What raises the risk

  • Opening things up: walls, floors, subfloors and roof decks hide rot, old wiring and plumbing.
  • House age: older houses are more likely to hold materials and systems that need updating when touched.
  • Permits: an inspector may require bringing nearby work up to current code.
  • Allowances in the quote: “tile allowance $8/sq ft” moves with what you pick.
  • Vague exclusions: “unforeseen conditions billed at time and materials”.

A way to size it

casaq’s suggestion (an opinion, not a standard): for fixed-scope replacements, a small cushion; for remodels, set aside enough to reach the 75th percentile of what owners paid for that job in today’s dollars if your quote is below it. In 2023 survey dollars, the 75th percentile for a kitchen remodel was $25,000 and for a bathroom remodel $14,700 [1]; casaq adjusts these with CPI-U to today’s dollars [2].

How to spend it

  • Agree in the contract that changes need a written change order with the price before work starts.
  • Ask for photos of any hidden damage before you approve extra work.
  • Track contingency spending in your log with the change orders attached.
  • Keep the invoices: improvements that add to your home’s value can add to its tax basis when you sell [3].

Quote Check shows the middle half of what owners paid, in today’s dollars, for 31 job types.

See the spread for your job

Sources

  1. U.S. Census Bureau, American Housing Survey (AHS) 2023, home improvement module (public use file). Retrieved 2026-10-05.
  2. U.S. Bureau of Labor Statistics, CPI-U, U.S. city average, all items (CUUR0000SA0). Retrieved 2026-10-05.
  3. IRS Publication 523, Selling Your Home. Retrieved 2026-10-05.

Information, not legal, insurance or engineering advice. Spot something wrong? Send a correction; accepted corrections are logged publicly with a date.