Change Orders: How a Build Budget Actually Moves

Every homeowner asks a version of the same question before signing a contract: how do I stop this budget from running away from me? It is a fair question, and the answer is less about the number in the contract than about the process that governs what happens after it.

Change orders are that process. They are also the part of a construction contract most homeowners skim.

What a change order actually is

A change order is a written amendment to the construction contract. It records three things: what is changing, what that does to the price, and what it does to the schedule. Both parties sign it, and the work proceeds afterward, not before.

That last part is the entire protection. A conversation on site is not a change order. An email saying "sounds good" is not a change order. The document exists so that six months later, nobody has to rely on memory about what was agreed to on a Tuesday in March.

Where changes actually come from

In our experience across Vancouver, Burnaby, and North Shore projects, changes arrive from four directions, and they are not equally predictable.

• Owner-requested: a different finish, an added bathroom, a reconfigured kitchen. Fully within the owner's control.
• Unforeseen site conditions: what the demolition reveals. Knob-and-tube wiring, undersized framing, failed perimeter drainage, previous work that was never inspected.
• Authority-driven: something a municipal inspector or engineer requires during the build that was not on the approved drawings.
• Design gaps: a detail the drawings did not resolve, which has to be decided before the trades can proceed.

Only the first category is a choice. The other three are discoveries, and how a builder handles them tells you most of what you need to know about the builder.

The renovation penalty

A renovation on a 1920s Grandview-Woodland or Kitsilano house generates more change orders than a new build of the same size on a cleared lot. This is not a reflection on anyone's competence. It is a straightforward consequence of the fact that nobody can see inside a wall until it is open.

Older Metro Vancouver housing stock shares a recognizable set of conditions: original wiring at the end of its life, framing sized to a different era's expectations, drainage that has been quietly failing for a decade, and layers of previous work done without permits. Any of those can turn into a change order the week the walls come down.

The cheapest change order is the one you found during pre-construction, when it was still a decision instead of an emergency.

This is why we push for real investigation before the contract price is locked, rather than after. Opening a few strategic access points on an older home costs something upfront. It routinely prevents a far larger surprise once the trades are mobilized and the schedule has no slack in it.

Fixed price does not mean no changes

There is a persistent misunderstanding worth clearing up. A fixed price contract fixes the price of the scope that was drawn and specified. It does not freeze the project against all future change.

If the scope changes, the price moves, through a change order. We have written before about how fixed price contracts create certainty and about where cost-plus contracts genuinely work better. Neither structure eliminates change orders. They differ in how the change gets priced, not in whether change happens.

Allowances are a different thing entirely

Homeowners often confuse allowances with change orders, and the distinction matters at invoice time.

An allowance is a placeholder carried in the original contract for something not yet selected, tile, plumbing fixtures, lighting. The contract assumed a number. When the real selection comes in, the price adjusts by the difference, up or down. That is an expected reconciliation, not a change in scope.

A change order covers work that was never in the contract. Mixing the two in conversation is how a homeowner ends up feeling blindsided by an adjustment that was, in fact, disclosed at signing. A good builder walks through every allowance line before the contract is signed and explains which ones are most likely to move.

Who is allowed to say yes

This one causes more friction than it should, and it is trivially preventable.

On a typical project, several people give instructions on site. Two spouses. An interior designer directing finish work. Sometimes an architect. The contract should name, in advance, whose approval actually commits the budget.

Without that, a site foreman receives a direction from one person, carries it out in good faith, and the invoice lands in front of someone who never agreed to it. The resulting argument has nothing to do with construction and everything to do with a question that could have been settled in one sentence at signing.

What a change order should contain

A change order that records only a dollar amount is doing half the job.

• A plain description of the change, written so someone reading it a year later understands it.
• The cost impact, broken into labour, materials, and any trade markup, rather than a single unexplained figure.
• The schedule impact in days, including any knock-on effect to trades sequenced behind the change.
• Who requested it, and which of the four categories above it came from.
• Signatures from the owner and the builder, dated before the work starts.

The schedule line matters more than homeowners expect. For a family renting elsewhere while the work runs, two added weeks is a real cost that never appears in the price column. We have written separately about what living through a renovation actually involves, and the schedule impact of change orders is a large part of that picture.

How contingency fits

A contingency is money set aside inside the budget for changes nobody can name yet. It is not padding, and it is not the builder's money.

A thin contingency makes a project look better on a spreadsheet and leaves nothing in reserve for the first genuine surprise. On an older Metro Vancouver home, that surprise is close to guaranteed. Where a budget carries a realistic reserve, unforeseen conditions get handled as planned work. Where it does not, every discovery turns into a conversation about finding money.

The contingency should be visible in the budget as its own line, drawn down against signed change orders, with what remains reported back to the owner as the project runs. A contingency the owner cannot see the balance of is not serving its purpose.

Reading the pattern

One change order in month three is normal. A steady stream of them, all small, all for work that seems like it should have been in the original scope, is telling you something else: the drawings were not complete enough to build from when the contract was signed.

That is worth catching early, because the fix is cheap at the start and expensive in the middle. If change orders are arriving weekly for items that feel like they belong in the base contract, the right move is to stop and reconcile the drawings against the contract scope, rather than continuing to process them one at a time.

Frequently asked