How much contingency should I hold?

Rather than a fixed percentage, ask your contractor what specifically they are uncertain about in your project. Older homes and basements carry genuine unknowns behind walls; new construction carries far fewer. The uncertainty should drive the contingency, not a rule of thumb.

Is scope creep always bad?

No — sometimes adding something while a wall is already open is genuinely efficient and much cheaper than doing it later. The problem is unplanned creep. If you are going to add something, price it and decide deliberately rather than nodding it through on site.

What is the most commonly forgotten cost?

Making good — drywall repair after trim removal, patching behind old cabinetry, and the painting that follows. It is real work, it is frequently excluded from a carpentry quote for legitimate reasons, and it is almost never in the homeowner’s mental estimate.

Costs

Renovation Budget Mistakes

Updated July 25, 20262 min read

The short answer

Renovation budgets rarely fail because of one large surprise. They fail through an accumulation of small forgotten items, scope creep, and a contingency that was never set aside. Nearly all of it is predictable, which means nearly all of it is avoidable.

The eight mistakes

No contingency at allIn an existing house, what is behind the walls is a genuine unknown. A budget with nothing held back is a budget that will be exceeded.
Budgeting the quote, not the projectRemoval, disposal, drywall repair, painting, permits and appliances are frequently excluded from a carpentry quote — legitimately. They are still costs.
Scope creep by increments"While we are at it" is how a kitchen becomes a main floor. Each individual addition is reasonable; the total is not.
Taking the cheapest quote without asking whyA 30% gap for the same scope is a lighter specification, and the difference reappears later as replacement.
Forgetting the finish stageFilling, caulking and painting are a large share of a project’s labour. Budgets that stop at installation are budgets that stop early.
Not pricing the disruptionWeeks without a kitchen means eating out. It is a real cost that never appears in a quote.
Phasing without designing firstSplitting a project without designing the whole thing produces mismatched results and repeated setup costs.
Spending it all on the visibleA beautiful door on a particleboard box is a budget allocated backwards.

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Answers

Frequently asked questions

How much contingency should I hold?: Rather than a fixed percentage, ask your contractor what specifically they are uncertain about in your project. Older homes and basements carry genuine unknowns behind walls; new construction carries far fewer. The uncertainty should drive the contingency, not a rule of thumb.
Is scope creep always bad?: No — sometimes adding something while a wall is already open is genuinely efficient and much cheaper than doing it later. The problem is unplanned creep. If you are going to add something, price it and decide deliberately rather than nodding it through on site.
What is the most commonly forgotten cost?: Making good — drywall repair after trim removal, patching behind old cabinetry, and the painting that follows. It is real work, it is frequently excluded from a carpentry quote for legitimate reasons, and it is almost never in the homeowner’s mental estimate.

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