Understanding Borrow Material: Definition and Key Uses Explained

Quick Summary

Borrow material is soil, sand, gravel, rock, or other approved material excavated from one location and transported to another for use in construction. Contractors commonly use it to build pads, raise grades, construct embankments, backfill excavations, and improve site conditions. Choosing the right borrow material helps create stable, long-lasting construction projects while reducing costly settlement and drainage problems.

What Is Borrow Material?

Borrow material is earth or aggregate that contractors remove from one location and transport to another construction site where additional material is needed. The word “borrow” simply means the material comes from an outside source rather than the project site itself.

Many construction projects require more material than the property can provide. For example, a developer may need to raise the elevation of a building pad, construct a roadway embankment, or backfill around underground utilities. Instead of relying on unsuitable on-site soils, contractors often import borrow material that better meets the project’s requirements.

Borrow material is not one specific product. It may consist of clean fill, select fill, structural fill, sand, gravel, crushed stone, or approved native soil. The type selected depends on the engineering requirements, project specifications, and intended use.

Why Is It Called Borrow Material?

The construction industry has used the term “borrow material” for decades.

Historically, contractors described the process as “borrowing” earth from another location because the project site lacked enough suitable material. Although the material is never returned, the terminology has remained part of the construction industry.

Today, borrow material typically comes from commercial borrow pits, quarries, excavation projects, or approved stockpiles where suitable material is readily available.

The source of the material is just as important as the material itself. Contractors often require documentation showing the material meets project specifications before delivery begins.

Why Borrow Material Matters in Construction

Construction projects depend on stable soil conditions. If a project lacks sufficient material or contain

s unsuitable soils, contractors must import additional material before construction can continue. Without proper borrow material, foundations may settle, pavements may crack, retaining walls may move, and drainage problems may develop. Borrow material allows contractors to create consistent site conditions before building begins.

It also helps improve:

• Site grading
• Drainage
• Bearing capacity
• Slope stability
• Foundation performance
• Long-term durability

Using the proper material often saves significant time and money by reducing future repairs.

Common Types of Borrow Material

Several different materials may qualify as borrow material depending on the project.

Common examples include:

• Common Fill – General-purpose soil used to build grades and fill low areas where engineering requirements are less demanding.
• Structural Fill – Engineered material designed to support buildings, roads, retaining walls, and other structural loads.
• Select Fill  – Higher-quality material chosen because it meets specific engineering or project requirements.
• Sand – Often used where drainage is important or where engineers specify granular material.
• Gravel – Frequently used beneath roads, parking lots, utilities, and foundations because of its excellent drainage and stability.
• Crushed Stone – Provides exceptional strength and compaction for heavily loaded construction projects.

The engineer or project specifications determine which material best suits the application.

Where Does Borrow Material Come From?

Borrow material may come from several different sources depending on availability and project requirements. Commercial borrow pits remain one of the most common sources because they often produce consistent material that contractors have used successfully on previous projects. Other sources include active construction excavations, highway projects, commercial developments, quarry operations, and approved stockpile locations.

In some cases, contractors can reuse material excavated from another portion of the same project if testing confirms it meets the required specifications. Before hauling begins, many projects require testing to verify that the material satisfies engineering requirements for gradation, moisture content, bearing capacity, or compaction.

How Contractors Use Borrow Material

Contractors use borrow material on nearly every type of earthmoving project.

Common applications include constructing residential building pads, commercial developments, roadway embankments, utility trench backfill, retaining wall backfill, parking lots, airport projects, industrial sites, and site grading.

Pool removal projects also frequently require imported material. After removing a swimming pool, contractors often need additional fill to restore the yard to its original grade. Depending on future construction plans, engineers may specify higher-quality material capable of supporting structures built over the former pool area.

Successful projects depend not only on selecting the right material but also on installing, compacting, and testing it correctly.

Borrow Material vs. Fill Dirt

Although people often use the terms interchangeably, borrow material and fill dirt are not always the same.

Fill dirt describes a specific type of material commonly used to fill low areas, build grades, or restore excavated sites. Borrow material is a broader term that refers to any approved material transported from another location for use on a project.

For example, a contractor may import fill dirt from a borrow pit. In that case, the fill dirt also qualifies as borrow material because it came from an off-site source. However, borrow material may also consist of sand, gravel, crushed stone, select fill, structural fill, or other approved materials depending on the project’s requirements.

Understanding this distinction helps property owners communicate more effectively with contractors and engineers during project planning.

Borrow Material vs. Structural Fill

Structural fill is one type of imported material, but not every imported material meets the requirements for structural applications. Engineers specify structural fill when a project requires reliable support for buildings, retaining walls, roads, bridges, or other load-bearing structures. These materials must satisfy strict standards for particle size, strength, moisture content, and compaction. In contrast, the term “borrow material” simply identifies material brought to the site from another location. Depending on its properties and the project specifications, imported material may serve as structural fill, general grading fill, landscaping fill, or other approved construction uses. Selecting the right material depends on the engineering requirements and the intended purpose of the completed project

Borrow Material vs. Engineered Fill

Imported material and engineered fill describe two different concepts. Imported material refers to soil, aggregate, or other approved material brought to a construction site from another location. Engineered fill, on the other hand, describes how contractors install and verify approved material according to engineering specifications. This process typically includes placing the material in controlled lifts, adjusting moisture when necessary, compacting each lift, and confirming the required density through field testing. Many projects use imported material to create a stable foundation, but it only qualifies as engineered fill after contractors install and test it in accordance with the project specifications.

Common Mistakes When Using Borrow Material

One of the most common mistakes is assuming all borrow material performs the same.

Material that works well for general grading may not provide enough strength for a building foundation or roadway. Likewise, material with excessive organic matter, clay, or debris may create settlement problems if used in the wrong application.

Another common mistake involves selecting material based solely on price. Lower-cost material may require additional processing, testing, or replacement if it fails to meet the project specifications. Working with qualified contractors and following the engineer’s recommendations helps avoid expensive delays and future repairs.

Contractor Tip

Many property owners ask for “fill dirt” when they actually need a specific type of borrow material. Before ordering material, determine how the finished area will be used. A yard, driveway, building pad, retaining wall, and commercial development may all require different materials. Taking a few extra minutes to verify the project requirements can prevent costly mistakes and improve long-term performance.

Frequently Asked Questions

What is borrow material?

Borrow material includes soil, sand, gravel, rock, or other approved material excavated from one location and transported to another construction site for use as fill, backfill, or grading material.

Where does imported fill typically come from?

Contractors commonly obtain imported material from commercial borrow pits, quarries, approved excavation sites, highway projects, and construction stockpiles that produce suitable earth or aggregate.

Is imported material the same as fill dirt?

No. Fill dirt is one type of imported material that contractors may use on a project. Depending on the application, they may also use sand, gravel, crushed stone, structural fill, or select fill to meet the project requirements.

Can imported material become engineered fill?

Yes. Approved material can become engineered fill when contractors place it in controlled lifts, compact it to the required density, adjust moisture when necessary, and verify the work through field testing.

Does every construction project require imported material?

No. Some projects contain enough suitable on-site soil to complete the work. Others require off-site material because the existing soils do not satisfy the project’s grading, drainage, or engineering requirements.

Final Thoughts

Borrow material plays an important role in nearly every type of construction project. Whether contractors are building roads, preparing foundations, restoring grades, or developing commercial sites, selecting the right material helps create stable, long-lasting results.

Understanding the difference between borrow material, fill dirt, structural fill, and engineered fill allows property owners and contractors to make better decisions before work begins. Matching the material to the project’s requirements reduces risk, improves performance, and contributes to a successful construction project.

Dirt Connections Network (DCN)

 

Finding the right material often depends on knowing the right people. Dirt Connections Network (DCN) is a private construction marketplace where contractors, suppliers, truckers, developers, estimators, and other construction professionals connect directly to discover projects, material opportunities, trucking resources, and business relationships throughout the United States and beyond.

Dirt Connections Public Listings (DCPL)

Dirt Connections Public Listings (DCPL) provides a public, searchable platform where homeowners, contractors, suppliers, truckers, and developers can post and discover available fill dirt, borrow material, topsoil, aggregates, and material needs throughout the United States and beyond. Users connect directly without a broker or middleman, making it easier to improve project visibility and material coordination.

Disclaimer

This article is intended for educational purposes only. Material requirements, engineering specifications, local building codes, and environmental regulations vary by project and location. Always consult the project engineer, geotechnical engineer, or other qualified construction professionals before selecting or using borrow material.