Time and Materials Contract in Construction Explained (With Real Examples)

Construction Projects Rarely Go Exactly as Planned

Construction projects rarely go exactly as planned. Design changes, supply chain delays, and unexpected site conditions can quickly alter project scope and cost.

That’s why contractors and project owners rely on different construction contract types to allocate risk and manage payment structures. One of the most flexible options is the time and materials contract in construction.

A time and materials (T&M) contract allows contractors to bill clients based on the actual labor hours, materials used, and equipment costs, rather than a fixed project price.

This approach works particularly well when the scope of work is unclear or likely to change during the project.

In this guide, we’ll cover:

• What is a time and materials contract

• A real-time and materials contract example

• Key components of a T&M contract construction agreement

• Time and materials vs fixed price contract comparison

• Best practices for contractors and project owners

What Is a Time and Materials Contract?

A time and materials contract is a construction agreement where the project owner pays the contractor based on:

• Labor hours worked

• Cost of materials used

• Equipment costs

• Contractor markup

Unlike fixed-price agreements, the final project cost is not predetermined. Instead, the contractor invoices the client periodically based on actual work performed.

This model is often used when the project's scope is evolving; design plans are incomplete, or unexpected site conditions may arise.

Because the cost is tied directly to work performed, T&M contract construction agreements provide greater flexibility for both contractors and owners.

Key Components of a Time and Materials Contract

A well-structured time and materials contract in construction typically includes several important elements.

1. Labor Rates

The contract defines hourly labor rates for each role involved in the project, such as:

• Project managers

• Engineers

• Skilled trades

• Laborers

These rates often include wages, overhead, and profit margins.

2. Material Costs and Markup

The contractor is reimbursed for materials used on the project.

Typical material markup ranges between 10% and 30%, covering procurement, transportation, and administrative costs.

3. Equipment Costs

Construction equipment used on the project may be billed based on:

• Hourly equipment usage

• Rental costs

• Operating costs

4. Not-to-Exceed Clause

Many T&M agreements include a maximum spending limit known as a Guaranteed Maximum Price (GMP).

This clause protects the owner by capping the total project cost while still allowing flexibility.

Time and Materials Contract Example

Let’s look at a simplified time and materials contract example.

Imagine a contractor hired to renovate a commercial office space where design details are still evolving.

Labor

Materials

• Wiring: $3,200

• Fixtures: $1,800

Material markup (20%): $1,000

Total Project Cost:
$18,500

If additional work is required, the cost will increase based on extra labor hours and materials used.

While time and materials contracts offer flexibility, many construction projects still use fixed-price agreements. Understanding the difference between the two helps contractors choose the right approach for each project.

Time and Materials vs Fixed Price Contract

Here’s how time and materials vs. fixed price contracts compare in practice:

When project requirements are uncertain, T&M contracts provide flexibility that fixed pricing cannot offer.

What Makes Time & Material Contracts a Better Option?

1. Flexibility for Changing Scope

Projects with evolving design or unknown conditions benefit from T&M agreements.

This flexibility allows contractors to adjust work, materials, and schedules without renegotiating the entire contract.

2. Transparency in Costs

Owners see actual labor hours and material costs, making pricing more transparent.

Detailed cost breakdowns also help build trust between contractors and project owners.

3. Reduced Estimating Risk for Contractors

Contractors don’t need to inflate bids to cover unknown risks.

Instead, they can focus on completing the work efficiently while billing only for the resources actually used.

4. Faster Project Start

Work can begin even before final plans are completed.

This helps projects move forward quickly, especially when timelines are tight or design details are still evolving.

Disadvantages of T&M Contracts

Despite the flexibility, T&M contract construction agreements also carry risks.

1. Less Cost Predictability

The final project cost can increase if the project takes longer than expected.

2. Higher Owner Risk

The project owner carries most of the cost risk.

3. Requires Strong Cost Tracking

Every hour worked and every material purchase must be recorded accurately.

Quick Tips to Create a Win-Win Situation with Time & Material Contracts

To make time and materials contracts successful, contractors and project owners should follow a few best practices.

1. Define Labor Rates Clearly

Specify hourly rates for each role involved in the project. Clearly defining rates for supervisors, skilled trades, and laborers helps prevent confusion or disputes during invoicing.

2. Establish Spending Limits

Use a not-to-exceed clause to control budget risk. This ensures the project stays within a defined financial boundary while still allowing flexibility for scope adjustments.

3. Track Labor and Material Costs in Real Time

Accurate cost tracking helps avoid disputes and billing errors. Using digital tools or construction software can make it easier to monitor job costs and maintain detailed records.

4. Document All Scope Changes

Even with flexible contracts, documenting changes improves transparency. Written records of scope updates, approvals, and additional work help protect both contractors and project owners.

Why Construction Software Matters for T&M Contracts

Managing a time and materials contract in construction manually can quickly become complicated. Contractors need accurate tracking of labor hours, material costs, equipment usage, and job budgets to ensure proper billing and avoid disputes.

Modern construction ERP solutions help centralize this information and provide better visibility into project costs.

Solutions like ProjectPro built on Microsoft Dynamics 365 Business Central help contractors:

• Track labor and material costs by job

• Monitor project budgets in real time

• Automate billing for T&M contracts

• Maintain accurate cost records to reduce disputes

Final Thoughts

Handling time and materials contracts in construction without accurate cost tracking can quickly lead to billing errors, disputes, and shrinking profit margins.

With ProjectPro, contractors can track labor hours, material costs, and job profitability in real time, while automating billing for T&M contracts.

To see how ProjectPro helps contractors gain full control over time and materials projects, talk to an expert.