Renovation Contingency: How Much to Set Aside

A practical guide · 2026

Ask anyone who's finished a renovation what they'd do differently and "I'd have kept a bigger contingency" is near the top of the list. A renovation contingency is the part of your budget set aside not for a specific job but for the unknowns — the rot behind the plaster, the drain that isn't where the drawing says, the price that's gone up since you got the quote. It's the difference between a surprise being an inconvenience and a surprise being a crisis.

How much contingency do you need?

There's no single right number, but there are sensible ranges that depend mostly on how much you can't see:

If you're choosing between two numbers, choose the higher one. A contingency you don't spend becomes budget back in your pocket; a contingency you didn't set becomes a credit-card balance or a half-finished room.

What a contingency is — and isn't — for

A contingency covers things that were genuinely unforeseeable or unavoidable: hidden damage, code-required work you didn't know about, a material that's been discontinued. It is not a slush fund for upgrades. The moment "we found extra money" becomes "let's get the nicer tiles," the reserve is gone before the risks that justified it have even appeared. Scope changes should come from the main budget (or a conscious decision to increase it), not from the safety net.

When to draw on it

Treat the contingency as a separate pot and move money out of it deliberately, one event at a time:

1. A genuine surprise or required change appears.
2. You price it as its own small commitment.
3. You draw that amount from the contingency and record it — what it was for, and the new balance remaining.

The point of recording each draw is simple: it keeps the reserve honest. "We've got plenty of contingency left" is a dangerous feeling when nobody's actually counting. Knowing you've drawn 60% of it by the half-way point is an early warning you can act on — slow down, re-scope, or top up the reserve — long before it's an emergency.

How to track the reserve

You want one number you can trust at any time: contingency set aside, minus everything drawn, equals what's left. A spreadsheet can do this if you're disciplined, but it's easy to forget to deduct a draw, and a stale reserve figure is worse than none because it gives false confidence. This is exactly what a budget app is good at — Storypole keeps a dedicated contingency buffer, lets you record each draw against it, and shows the depleting reserve right at the top of the cost screen as a live early-warning, so you can't accidentally believe you have headroom you've already spent.

Common mistakes

• No contingency at all. The most expensive line item in many renovations is the one nobody budgeted for.
• Spending it on upgrades early. By the time the real surprise lands, the cushion is gone.
• Not tracking draws. An un-tracked reserve feels infinite until it isn't.
• Setting it as a vague "buffer in my head". If it isn't a number you can see, it isn't protecting you.