Time & Materials Contracts Explained: How Better Documentation Leads to Better Project Outcomes

There is no one-size-fits-all construction contract. From a general contractor’s (GC) perspective, every contract has the same core objectives: establishing a clearly defined scope and realistic schedule, allocating risk fairly, and ensuring appropriate compensation, etc. The difference lies in how these objectives are achieved. While lump-sum contracts are the most common, they’re not always the best fit. For projects with uncertain scope, changing conditions, or evolving owner requirements, a Time and Materials (T&M) Contract can be the better choice for GCs.

What is a T&M Contract, and when is it ideal?

T&M contracts represent approximately 20% of construction projects in the United States. 

As a reminder, a T&M contract is an agreement in which the project owner reimburses the contractor for the actual cost of labor, materials, equipment, and other approved project expenses, plus an agreed-upon markup for overhead and profit. Unlike a lump-sum contract, which establishes a fixed project price, a T&M contract is based on the actual resources used to complete the work. Many T&M agreements also include a not-to-exceed (NTE) limit to help manage costs while providing the owner with greater budget certainty. 

Many people enjoy surprises in everyday life. On construction projects, however, not so much. Surprises usually lead to schedule delays, budget overruns, and unexpected risks. Owners and general contractors alike value certainty. They want a clearly defined scope, a realistic schedule, predictable costs, and fair risk allocation.

Yet anyone with construction experience knows that complete certainty is rarely possible. Existing conditions, evolving project requirements, and unforeseen site issues can quickly change the scope of work. For projects with that level of uncertainty, a Time & Material (T&M) contract can provide the flexibility to adapt while maintaining transparency and accountability. 

In a lump-sum (fixed-price) contract, unexpected conditions can erode a GC’s profit margin and lead to difficult change-order negotiations with the project owner. Although these agreements are intended to provide price certainty, unforeseen field conditions often shift cost and risk back onto the GC once work is underway. When disagreements over scope and pricing are not clearly resolved, disputes can escalate into claims or even litigation. 

Industry data reflects this reality. A 2019 Global Construction Disputes Report found that 30% of construction projects end in dispute. The 2025 version noted that “During the year 2024, the average value of construction disputes in North America saw a significant surge, increasing by 40%…” The average dispute length is 12.5 months.

While T&M contracts are not immune to disputes and litigation, they can help reduce exposure by aligning compensation directly with actual labor, materials, and equipment used. It is supported by ongoing documentation and transparency. 

So, when is a T&M contract the right fit?

One clear example is when the project scope hasn’t been fully developed. This may occur when an owner is still finalizing funding, awaiting public approval, or refining design decisions. In these situations, a T&M contract allows a GC to begin work without assuming the full risk of an undefined scope, while accommodating the changes likely to occur as the project evolves.

Another common use case is emergency or rush work. When damage has occurred and owners need an immediate response, there is often insufficient time to develop a detailed estimate or negotiate a fixed price. A T&M contract allows the GC to mobilize quickly, perform the necessary work, and document costs as the project progresses.

Pros and Cons of T&M Contracts

While T&M contracts are a good option for GCs working in uncertain or fast-moving conditions, they also have drawbacks. Before signing off on a T&M contract, it’s important to understand both sides of the equation. 

Let’s start with the pros.

• The compensation package is straightforward. Contractors are paid the agreed-upon rate for labor, materials, equipment usage, and markup. If the scope evolves and additional work is required, contractors are paid accordingly, minimizing their risk.
• There is minimal estimating risk for contractors. Because contractors are reimbursed for actual time and materials, there’s less pressure to include large contingencies in the bid. Overall, there’s less work to do prior to construction. This often enables faster project mobilization, so work and compensation begin sooner. 
• In addition, T&M projects demand deep transparency. GCs need to share detailed tracking of labor, materials, and equipment with the owner. When done well, this can foster a good working relationship with the owner.

And the cons.

• Because payment is tied to actual effort rather than a fixed output, incentives tied to early completion or efficiency can be reduced, which may impact potential profits if not actively managed.
• Ongoing, consistent communication with the owner is a must. Since the final scope isn’t fully defined at the beginning of the project, owners need to be updated regularly to avoid misunderstandings around cost and progress. Without clear expectations or controls, such as not-to-exceed limits, projects can become vulnerable to cost overruns and disputes.
• EVERYTHING must be documented. GCs need to maintain meticulous records of labor, materials, equipment, and daily activities to validate costs. While this is time-consuming, a failure to do so can lead to delayed payments and/or disputes over compensation.

Ultimately, a well-managed T&M contract provides the flexibility to begin work quickly while ensuring contractors are compensated for the actual labor, materials, and equipment required. However, without the right processes and documentation, T&M projects can lead to budget overruns, scope creep, and billing disputes. 

Keys to a Successful T&M Contract

The flexibility of a T&M contract is one of its greatest strengths. However, if it’s not backed by disciplined documentation and real-time project visibility, that flexibility can quickly become a liability for GCs. The key to a successful T&M project is accurately tracking every labor hour, material purchase, equipment charge, and change order to support billing, monitor project costs, and keep owners informed as work progresses. 

To maximize the benefits of a T&M contract, GCs must consistently document throughout the project. This includes:

• Tracking labor daily. Record employee hours, trade classifications, and work performed to ensure accurate billing.
• Documenting material purchases in real time. Save receipts, purchase orders, and delivery tickets to create a complete audit trail.
• Logging equipment usage. Record equipment hours and associated work activities to support equipment charges.
• Managing change orders proactively. Document owner-requested changes as they occur and obtain approvals whenever possible.
• Keeping centralized project records. Store all documentation in one location to simplify invoicing, improve visibility, and reduce billing disputes.

Maintaining the level of documentation required for a successful T&M project is essential, but in practice, it can be difficult, time-consuming, and costly when managed manually. Tracking labor hours, material purchases, equipment usage, and change orders across multiple teams and job sites, all while keeping information accurate and up to date, is a tall task.

When this is done through paper records, spreadsheets, or disconnected systems, the risk of missing or inaccurate data increases significantly. These gaps can impact billing accuracy, delay invoicing, and lead to disputes with project owners over costs and scope. 

The most effective way to manage T&M contracts is with construction management software. It provides GCs the visibility and accountability they need to oversee labor hours, material costs, equipment usage, and change orders in real time. This level of tracking helps ensure accurate billing, provides clear support for costs incurred, and keeps owners aligned with project progress. The result is better financial control, fewer disputes, and stronger protection of contractor profitability throughout the project. 

If your team is focused on improving real-time tracking of costs, labor, and project changes, reach out to RedTeam. We can help you manage your next T&M project more effectively and set it up for success.