How much contingency should a renovation budget have?

A rule of thumb is 10–20% of the project cost. Newer homes and cosmetic projects can stay near 10%; older homes and anything that opens up walls, plumbing, or electrical should lean toward 15–20%, because that's where the expensive surprises hide.

What should a renovation budget include?

Materials, labor or your contractor's price, fixtures and finishes, permits and fees, design or drawings if any, and a contingency buffer for surprises. Leaving out permits, design, or contingency is the most common way a budget comes up short.

Why do renovations go over budget?

Usually because of hidden conditions found once work starts (rot, outdated wiring, non-level floors), scope changes mid-project, and finishes chosen without a firm budget. A realistic contingency and a written budget you track against prevent most overruns.

Renovation Budget Template: How Much Contingency Do You Need?

A renovation budget isn't just a total — it's a list of everything the project will cost, plus a buffer for what you can't see yet. The homeowners who go over budget almost always missed the same two things: a category they forgot, or a contingency that was too small. Here's how to build one that holds up.

What a renovation budget should include

Materials — tile, drywall, paint, lumber, and the like.
Labor — your contractor's price, or your own trades if you're managing them.
Fixtures & finishes — vanities, tubs, faucets, lighting, cabinets, counters. The line that balloons fastest.
Permits & fees — building permits and inspections. Small, and often forgotten.
Design / drawings — a designer or architect, if the project needs one.
Contingency — the buffer for surprises. Not optional.

How much contingency?

The rule of thumb is 10–20% of the project cost. Where you land depends on the risk:

Contingency by project risk
Situation	Contingency
Newer home, cosmetic work, nothing opening up	~10%
Typical remodel with some plumbing or electrical	~12–15%
Older home, or walls/plumbing/wiring opening up	~15–20%

The temptation is to zero it out to make the numbers work. Don't — that's not saving money, it's hiding the risk. The surprises come whether or not you budgeted for them.

The rule Contingency isn't padding — it's the part of the budget that keeps a nasty surprise from becoming a stalled project. Budget 10–20%, more for older homes.

Build the whole budget in one place — free

The BidSolid Renovation Budget + ROI Tool has every category built in, applies your contingency automatically, and adds an honest resale-recoup estimate. There's a free lite version, and the full tool adds a financing calculator and budget scenarios.

Get the free version

Frequently asked

How much contingency should I budget?

10–20% of project cost — near 10% for newer homes and cosmetic work, 15–20% for older homes or anything opening up walls, plumbing, or wiring.

What should the budget include?

Materials, labor, fixtures and finishes, permits, design if needed, and contingency. Forgetting permits, design, or contingency is the usual shortfall.

Why do renovations go over?

Hidden conditions, mid-project scope changes, and finishes chosen without a firm budget. A real contingency and a written budget prevent most of it.

Contingency guidance reflects standard industry rules of thumb. Educational only; your project's costs depend on its condition and scope.