Two line items cause more end-of-job arguments than everything else on an estimate combined, and it's usually because the contractor and the customer are reading them differently. An allowance and a contingency both look like "extra money set aside" from a distance. They're not the same thing, they don't cover the same risk, and treating them as interchangeable — or worse, folding both into one lump-sum number — is exactly what produces the ugly conversation three weeks into the job.
Two different kinds of unknown
An allowance is a placeholder for a selection the customer hasn't made yet. The work is in scope — you know you're installing tile in the bathroom, you know you're hanging light fixtures in the kitchen — but the specific product and its price aren't settled. Nobody's picked the tile yet. The allowance is your best estimate of what it'll cost once they do.
A contingency is a buffer for unknown conditions — not unknown selections, unknown reality. What's actually behind that wall. What the subfloor looks like once the old tile comes up. Whether the wiring in a 1920s house meets any code written after Truman left office. Nobody, including you, knows in advance whether a contingency gets spent. That's the whole point of it.
The distinction matters because the two numbers behave completely differently once the job starts:
- An allowance almost always gets spent, in some amount — the customer needs tile whether it costs $4 a square foot or $14. The only question is how close the real number lands to the placeholder.
- A contingency might get spent in full, in part, or not at all. A gut remodel on a century-old house is going to eat into contingency almost every time. A new deck going onto open ground, with nothing to open up and no existing structure to surprise you, might use none of it.
Mixing them into a single "extra 10%" line, or worse, quietly building both into a lump-sum price without naming either one, means the customer has no way to tell which kind of number they're looking at — and no way to know, when the final bill runs over the original quote, whether that's because they picked expensive tile or because you found rot. Those are two very different conversations, and a customer who can't tell them apart is going to assume the worse one.
Sizing an allowance so it isn't quietly misleading
The failure mode with allowances isn't usually dishonesty — it's optimism dressed up as a number. A contractor under pressure to look competitive against three other bids sets the tile allowance at $3 a square foot because it makes the total look better, knowing full well the customer is going to walk into a showroom and fall for something at $9. That allowance wasn't a placeholder. It was a number chosen to win the bid, and the customer finds out three weeks in that the "included" flooring doesn't include the flooring they actually want.
The fix is simple to state and requires a little more work up front: price the allowance against a real product at a real price the customer could actually buy today, not a number that makes the bid look competitive. If you're quoting a $6-a-square-foot tile allowance, know that $6-a-square-foot porcelain actually exists at the supplier you'd send the customer to, and that it isn't the worst thing on the shelf. If the customer's taste runs upmarket, say so before they pick — "most of our clients in this budget range end up around $8–10 a square foot for something they're happy with" is a more useful sentence than a low number that just delays the disappointment.
Sizing a contingency, and why it isn't one number for every job
Contingency should scale with how much you can actually see before you start. The less visibility you have into existing conditions, the higher it needs to be.
- A gut remodel on a 1920s house — old wiring, unknown plumbing runs, plaster over who-knows-what, a real chance of rot once walls open up — commonly carries a contingency in the 15–20% range of the job's direct cost. You're not being pessimistic; you're pricing the fact that nobody has seen inside those walls since Eisenhower was president.
- A new deck on open ground with no existing structure to demo and nothing hidden to uncover might carry 5% or less, mostly to cover things like unexpected soil conditions at the footings.
- Most remodel work involving demo of existing finishes — a kitchen gut, a bathroom down to the studs — tends to land somewhere in between, often 10–15%, depending on the age of the house and how much of the existing structure you can actually inspect before signing the contract.
The variable that matters most is visibility, not project size. A $200,000 new-construction addition with engineered plans and a clean site can carry a lower contingency percentage than a $15,000 bathroom gut in a house nobody's opened a wall in since it was built.
What happens to unspent contingency
This is the sentence that makes the whole line item credible, and a lot of contractors skip it: unspent contingency belongs to the customer. If you budgeted $3,000 for unknown conditions and only used $800 of it, the other $2,200 comes off the final bill — not into your pocket as a quiet profit bump.
Say this up front, in writing, on the estimate. A customer who hears "we set aside a contingency, and whatever we don't use comes back to you" trusts the number in a way they won't if contingency reads as a hidden markup with a nicer name. It also removes your own incentive to go looking for reasons to spend it, which is the thing customers are (reasonably) suspicious of when they hear the word.
How an allowance overage becomes a change order
When the customer picks tile that runs over the allowance, that overage isn't a surprise charge tacked onto the final invoice — it's a change order, priced and approved before you place the material order. If you haven't nailed down how change orders work on your jobs, this post covers the process in full; the short version here is that the reconciliation should happen at the moment of selection, not at the moment of the final bill. The customer picks the $9 tile against a $6 allowance, you write up the $3-a-square-foot difference across the actual square footage, they sign it, and everyone's clear on the number before the material shows up on site.
Contingency reconciles differently — there's no "selection" moment to trigger it. It gets tracked against actual spend as discovered-condition work comes up (the same category of work covered in the change-orders post), and the unspent balance gets credited at the final invoice, alongside whatever draw schedule you're using to collect payment through the job.
What to literally write on the estimate
Vague allowance and contingency lines are the single biggest reason this gets adversarial later. Write down, for each allowance:
- The dollar amount, and the unit it's priced per — "$6/sq ft, material only, installation priced separately" is a completely different number than "$6/sq ft installed," and the two get confused constantly.
- What it covers and what it doesn't — tile only, or tile plus trim and transition pieces?
- The date the customer needs to make the selection by, tied to your lead time for ordering. No date means no accountability when a stalled decision pushes the schedule.
And for contingency:
- The dollar amount and the percentage it's based on (materials only, or the full job cost).
- A one-line statement that unspent contingency is credited back at final invoice.
- What triggers drawing on it — typically your discovered-conditions clause from the scope of work, the same clause that turns a rotted subfloor into a legitimate change order rather than a dispute.
Worked example: a bathroom remodel
A $22,000 bathroom gut on a house built in 1962. The estimate carries a $2,400 tile allowance (200 sq ft of floor and shower wall at $12/sq ft installed) and a $2,200 contingency (10% of direct job cost, for discovered conditions behind the existing tile and subfloor).
The customer falls for a tile that runs $16/sq ft installed — a $4/sq ft difference across 200 sq ft, or $800. That gets written up and signed as a change order before the tile is ordered. Separately, once demo starts, the plumber finds galvanized supply lines that need to be replaced before the new fixtures go in — $650 in additional labor and material, drawn from contingency and documented against the discovered-conditions clause.
Final numbers: the tile allowance overage adds $800 to the contract price via change order. The contingency absorbs the $650 in plumbing work, leaving $1,550 of the original $2,200 unspent — and that $1,550 comes off the final invoice. The customer paid more for their tile choice, which was their decision to make. They paid less than the full contingency, because the house had fewer surprises than budgeted for. Both outcomes are visible, both were explained at the moment they happened, and neither shows up as a mystery number on the last page of the invoice.
That's the actual value of separating these two lines: not that either one is small, but that the customer can always tell which kind of number they're looking at.
JobPencil estimates support allowance and contingency as their own line items — priced per unit, with selection deadlines and reconciliation built into the same document the customer signs, not a side conversation that happens after the fact. Build one free in the browser, no account required.