In a stable-price environment the difference between a fixed-price and a cost-plus renovation contract is mostly administrative. In 2026 it is a risk allocation decision, and it deserves an explicit conversation.
Why it matters now
Material costs are running above pre-2020 levels because of supply-chain pressure and tariffs on imported building products. Lumber, roofing materials and imported tile have all seen significant increases, with roofing tariffs from 10% to 60%. Cabinets, steel and appliances carry exposure.
On a project spanning several months, prices can move between quote and purchase. Someone absorbs that.
Fixed price
The contractor carries the risk. If materials rise, their margin absorbs it.
The consequence is that a competent contractor prices that risk in. A fixed-price quote in a volatile market includes a buffer, and you pay for it whether or not prices move.
It is the right choice when you need budget certainty — particularly if the project is financed and the payment schedule is fixed.
Cost plus
You carry the material risk and pay the contractor a fee or percentage.
You avoid paying for a buffer you may not need, and you benefit if prices fall. You also carry the exposure if they rise, which makes the final figure genuinely uncertain.
It works when there is trust, transparency on invoices, and a client who can absorb variance.
The middle options
Fixed price with a material escalation clause. Fixed unless a named category moves beyond a defined threshold. Given that tariff exposure is concentrated in identifiable categories — cabinets, steel, appliances, roofing, imported tile — this can be written precisely rather than vaguely.
Fixed price with an allowance. Common for finishes: a budget figure for tile or fixtures, reconciled against actual. Keeps the structural work fixed while leaving selection open.
Early material purchase. Buying and storing the exposed items at the start removes the timing risk entirely. It requires storage and capital, and it is the cleanest answer where both exist.
Questions to ask before signing
What happens if material prices move? A contractor who has thought about this answers precisely.
Which items are quoted and which are allowances? Allowances are where budgets drift.
When are materials purchased? Ordering at the start versus as needed changes the exposure.
Is the quote before or after HST? In Ontario, 13% applies to labour and materials — over $52,000 on a $400,000 project. Permits add $400 to $2,000+.
The contract type is not a detail to leave to the contractor’s standard template. It is the single clause that determines what your number actually means.
Sources
- Maserat Developments — Hidden Costs Guide
- Lighthaus Built — 2026 Pricing Breakdown
- MeinHaus — Renovation cost in Canada 2026