Material Costs in Contractor Billing: What You're Actually Paying For

Understanding Material Costs in Renovation Billing

Material billing is one of the most misunderstood areas of renovation contracting. Here's how it actually works — and how to ensure you're being billed fairly.

How Contractors Price Materials

Contractors typically price materials one of three ways: (1) Cost-plus — they charge you their actual cost plus a percentage markup (15–30% is typical). (2) Fixed price — materials are included in a firm total project price. (3) Time and materials — you pay actual material receipts plus labour at an hourly rate.

What Does the Markup Cover?

A contractor's material markup isn't pure profit. It covers: time sourcing and ordering materials, managing deliveries and storage, handling returns for damaged or excess material, and the risk of material price increases between quote and purchase. These are real costs worth paying for on complex projects.

How to Ensure Transparency

Request that your contractor specify major materials in the contract — brand, model/style, and quantity. For cost-plus billing, ask to see material receipts. For fixed-price contracts, get a clear scope that specifies material quality so you can confirm the materials used match what was quoted.

When to Question Billing

Question billing when: materials specified in the contract are substituted for cheaper alternatives; the quantity billed significantly exceeds the area of the project; or the project price increases substantially beyond what change orders would justify. Legitimate contractors welcome questions about billing.