Renovation Contingency: How Much to Set Aside

Nobody plans for surprises on purpose — and yet almost every homeowner lives through at least one before their renovation wraps. Rot behind an old tub surround. A plumbing run that doesn't match the drawings. An electrical panel too old to safely reuse.

None of that means your project is doomed to run over. It means your budget needs a number built specifically for the unknown: a renovation contingency. The real question isn't whether you need one — it's how much, because "add a bit of cushion" isn't a plan, and neither is picking 10% out of thin air.

Here's how much to actually set aside, how that number shifts by project type and home age, and how it works differently once you're pricing against a fixed-price quote instead of an hourly one.

What a Renovation Contingency Actually Is

A renovation contingency is money held on top of your renovation budget — not for upgrades you're hoping to add, but for genuine unknowns that only surface once work begins. Think of it as insurance against what's behind your walls, not a slush fund for changing your mind about tile halfway through.

Key Insight: A contingency covers what nobody could reasonably have priced without opening the wall. It does not cover a mid-project decision to upgrade your countertop or add a feature that was never in the original plan — that's a change order you chose, not a surprise you absorbed. Our piece on renovation mistakes that blow your budget covers why blurring that line is one of the most common ways a budget gets away from people.

How Much Should You Set Aside?

There's a well-established range for this, and Vancouver's older housing stock tends to push most local projects toward the upper half of it.

Project type / home age	Recommended contingency	Why
Newer home (post-1990), cosmetic-only scope	10%	Walls haven't been opened in decades; systems are likely already up to date
Mid-range kitchen or bathroom renovation	10–15%	Some plumbing and electrical opens up, with modest but real uncertainty
Whole-home renovation, any era	10–15%	More square footage touched means more chances to find something
Pre-1980s home, full renovation or gut	15–20%	Aging wiring, plumbing, and framing are the rule here, not the exception
Character or heritage home, major structural work	20–25%	Unknown structural conditions and original systems compound the risk

These numbers line up with what we walk clients through project by project. Our basement renovation cost guide recommends the same 10–15% range, because basements have some of the highest rates of "we found something" of any space in a house. Our whole-home renovation cost guide lands in the same range for a related reason — the more of a house you touch, the more chances there are to uncover something nobody could have seen from the outside.

Why the Same Renovation Can Need a Different Number in Two Different Houses

Two kitchen renovations with identical square footage and finishes can carry very different contingencies, for one reason: what's behind the wall.

A kitchen in a 2005 townhouse and a kitchen in a 1936 character home aren't the same risk, even if the cabinets on the mood board look identical. Age correlates directly with what's inside the walls — permit history, prior renovations (or the total absence of them), and whether the electrical and plumbing have ever been touched since the home was built. A house renovated in the 1990s likely already has grounded wiring and modern drainage behind newer drywall. A house that's never been opened up below the surface is one where the panel, the pipes, and the framing are all original — and it only takes one of those to justify the wider cushion.

What a Contingency Covers — and What It Doesn't

Vague contingency talk is exactly how homeowners end up over- or under-budgeting, so it's worth being specific.

A contingency typically covers:

• Rot, mould, or water damage found once a wall or tub surround comes out
• Knob-and-tube wiring or ungrounded circuits discovered behind newer finishes
• Galvanized or aging plumbing that needs replacing once it's exposed
• Structural framing that doesn't meet current code once it's uncovered
• Code-required work triggered by the permit process itself — for example, an inspector requiring a panel upgrade once electrical is opened up

A contingency should not be treated as budget for:

• Upgrading finishes mid-project because you saw something nicer at the showroom
• Adding scope that was never part of the original plan
• Absorbing a quote that was thin to begin with — that's not a surprise, that's a low estimate doing what low estimates always eventually do

Key Insight: If you notice yourself dipping into contingency for choices rather than discoveries, that's a scope conversation — not a budget one. A detailed, fixed-price proposal exists precisely so decisions like these get made on paper before demolition starts, not improvised once the walls are already open.

Is a Contingency the Same Thing as a Change Order?

No, though the two are closely related. A contingency is the money you set aside in advance. A change order is the paperwork that documents each specific use of it — what was found, what it costs, and what it does to the schedule. Every legitimate draw against your contingency should show up as a written change order, never as a verbal heads-up followed by a bigger invoice at the end. If a contractor can't put a change in writing before the work happens, that's worth pausing on.

How to Use a Contingency Without Quietly Losing It

1. Track it as its own line. The moment contingency gets folded into "the budget" generally, you lose the ability to see whether you're actually protected or already exposed.
2. Require a written change order for every draw. Cause, cost, and schedule impact, documented before work proceeds — not explained after the fact on an invoice.
3. Ask what's already priced in. A contractor who's properly surveyed your home has likely already built known risks — old wiring in a pre-1970s house, for example — into the fixed number itself, which means your personal contingency is there for the truly unknown, not the entirely predictable.
4. Don't spend it early out of relief. It's tempting to fold contingency into a wishlist upgrade once you're a few weeks in and nothing's gone wrong yet. The surprise that shows up in month three won't check whether you've already spent the cushion on tile.
5. Let it go unused when it goes unused. Contingency you don't need isn't wasted money — it's the plan working exactly as intended.

Where a Fixed-Price Contract Changes the Math

This is the part that surprises most homeowners: your personal contingency and your contractor's pricing risk are two separate things, and mixing them up gets expensive fast.

On a time-and-materials or cost-plus job, the contractor's risk is largely passed straight to you — every surprise becomes a new bill, stacked on top of whatever contingency you'd already set aside. Under a genuine fixed-price contract, a contractor who's actually surveyed your home has already priced the predictable risks — the wiring, the plumbing, the framing you'd reasonably expect in a house of that age — directly into the number they quote. What your own contingency has to cover shrinks to the truly unforeseen, instead of the merely likely.

That distinction matters before you compare two quotes side by side, and we've written a full breakdown of how a fixed-price quote differs from a lowball one — including the questions that expose which one you're actually looking at.

We build every estimate this way. We survey the space, price the risks we can reasonably expect for a home of its age and condition, and hold that number. What we quote is what you pay — your contingency stays reserved for the genuinely unforeseen, not for gaps we should have caught ourselves.

A Simple Example

On a $150,000 mid-range renovation, here's what different contingency percentages actually look like in dollars:

Contingency %	Amount set aside
10%	$15,000
15%	$22,500
20%	$30,000

A newer home going through that same $150,000 scope is reasonably budgeted at 10–15%. A 1960s character home taking on the same renovation is better planned at 15–20% — and if that extra cushion goes unused, it simply never gets spent, since a real contingency isn't a fee, it's a reserve.

Key Takeaways

• Set aside 10% for newer homes and cosmetic-only work, 10–15% for most mid-range and whole-home renovations, and 15–25% for older, character, or heritage homes and any full structural work.
• A contingency covers genuine unknowns — rot, old wiring, outdated plumbing, code-triggered upgrades. It does not cover mid-project upgrades or scope you chose to add.
• Every legitimate draw against contingency should arrive as a written change order, not a bigger invoice at the end.
• A fixed-price contract narrows what your contingency needs to cover, because predictable risks are already priced into the number you sign.
• Unused contingency isn't a loss — it's confirmation the plan worked.

FAQ

How much contingency should I budget for a kitchen or bathroom renovation? Around 10% for a newer home, and closer to 15% for an older Vancouver home where the walls behind the cabinets or tub haven't been opened in decades.

Is a renovation contingency the same as an allowance? No. An allowance is a placeholder budget for a specific item you haven't chosen yet, like tile or light fixtures. A contingency is a reserve for unforeseen conditions discovered once work starts. Confusing the two is a common way homeowners under-budget both.

What happens if I don't use my contingency? It stays yours. A contingency is a reserve, not a fee — if the project goes as planned, that money is simply never drawn on.

Does a fixed-price contractor still need me to keep a contingency? Yes, but it covers less ground. A fixed-price quote from a contractor who's surveyed your home properly has already priced the predictable risks into the number; your personal contingency is there for the small percentage of things that genuinely couldn't have been known in advance.

Should I keep my contingency as cash or as available credit? Either works, as long as it's genuinely accessible and separate from your day-to-day finances. What matters more is treating it as untouchable for anything other than a documented, written change order.

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A contingency isn't a sign you're expecting things to go wrong — it's what lets you handle it calmly if something does. If you're planning a renovation in Vancouver and want a number that already accounts for what's realistic for your home's age and condition, reach out for a fixed-price estimate. We'll walk the space, tell you honestly what we expect to find, and put one number in front of you that's built to hold.