How to Read Warehouse Specifications When Choosing a Building to Lease

When leasing warehouse space, one number—like a 32-ft clear height or 50-ft column spacing—can make or break your logistics efficiency. Understanding warehouse specifications is one of the biggest challenges when looking for the right space to lease. Listings are full of numbers, technical details, and features that many tenants don’t fully understand. But once you know what common warehouse terms actually mean, it’s much easier to choose the right warehouse space that works for your business instead of against it.

In this guide to reading warehouse specifications, you’ll learn how to decode listing terms, identify what’s really important for your business operations, and choose an available space that fits your present and future needs.

How to Read Warehouse Specifications—10 Warehouse Specs You Need to Understand

When searching through warehouse listings, having a basic understanding of important specifications can mean the difference between paging past impractical options and spending hours touring dozens of warehouses that won’t be efficient for your business.

What warehouse specifications matter most? Here are our top 10:

1. Clear height
2. Cubic storage capacity
3. Column spacing
4. Building depth
5. Floor load rating/floor load capacity
6. Lighting, ventilation, and HVAC
7. Sprinkler system type
8. Power supply
9. Dock doors, drive-ins, and access points
10. Zoning/use restriction

From understanding how much product can be stored to choosing a building with adequate power supply, these industrial property specifications can have an astronomical impact on how a building functions. What’s important for your business and what’s not? Let’s jump in to what each one of these specifications means so that you can make the best choice for your warehouse lease.

1. Clear Height

Clear height is the measurement of a warehouse’s height, taken from the floor to the lowest hanging object—not the actual ceiling. Clear height describes how high items can safely be stacked on racking in a building, which is why the number only goes up to the lowest hanging lighting, ductwork, or sprinklers.

With the rise of e-commerce and higher inventory levels, tenants are demanding higher clear heights, especially in metro areas like Charlotte, NC. While older buildings often had clear heights of 20′ or less, modern warehouses are emerging with clear heights of 28′, 32′, 36′, or even higher. The need for more storage is rising, and building taller ceilings is generally the most cost-effective way to increase storage efficiency without increasing overall square footage.

For example, increasing a building’s clear height from 32′ to 36′ can increase the warehouse’s overall capacity by 10%-25%.

2. Cubic Storage Capacity

Understanding cubic storage capacity is essential for deciding how much warehouse space you actually need.

This metric is a critical factor that describes the total amount of usable storage space a building offers, taking into account square footage as well as clear height. Cubic storage capacity allows you to know how much product a warehouse can actually hold.

To calculate cubic storage capacity, measure the warehouse’s total square footage, subtract non-storage spaces (such as bathrooms and offices), then, identify the clear height. The formula will look like this:

Usable Square Footage x Clear Height (in feet) = Cubic Storage Capacity

For example:

15,000 Square Feet x 20 Foot Clear Height = 300,000 Cubic Feet of Storage Capacity

3. Column Spacing

Column spacing is a horizontal measurement that refers to the distance between vertical supports in a warehouse. For example, a modern warehouse might have a grid layout of 52′ x 50′, meaning columns are 52′ apart in one direction and 50′ apart in the other.

Buildings with wider column spacing offer more unobstructed space, which means the layout of your warehouse can accommodate more efficient racking, larger aisle width, and easier maneuvering of forklifts and large equipment. This also makes both the receiving and picking processes more efficient, especially for automated material handling equipment.

4. Building Depth

Building depth measures a warehouse’s distance from the front to the back wall. This measurement matters for architectural design and zoning requirements in new builds. But it’s also important for giving insight into the possible arrangements for existing buildings, affecting how efficiently you can arrange storage racks, workstations, or assembly lines.

5. Floor Load Rating/Floor Load Capacity

Floor load rating is a measure that describes the amount of weight a floor can hold per square inch (PSI) or per square foot (PSI). This number is important for understanding whether a warehouse floor can sustain certain heavy machinery, both in use and in storage. Too much pressure exerted on a floor may not have a cataclysmic effect right away. Instead, it starts with a small crack but can proceed to cause monumental structural damage over time.

Floor load capacity is another measurement that identifies the total weight a floor can hold. It includes both the dead load (the permanent weight of the floor itself) and the live load (variable weights such as equipment, furniture, and workers). Construction quality and structural factors such as material strength and column spacing help determine floor load capacity. Knowing the floor load capacity of a warehouse is important for distributing equipment, racking, and inventory properly over the floor in order to uphold structural integrity.

6. Lighting, Ventilation, and HVAC

Proper lighting in warehouses greatly affects occupational safety. It also plays a key role in increasing productivity and workers’ comfort in warehouse and storage areas.

Lighting requirements vary somewhat in different types of warehouses and work areas. In areas with heavy equipment, OSHA safety standards require at least 2 lumens per square foot. However, best practice minimum requirements are at least 10 lumens per square foot, while warehouses moving smaller items can benefit from up to 30 lumens per square foot.

Proper ventilation removes contaminants and fumes from the air, reduces odors, helps to prevent compounding health issues for employees, and keeps warehouses cool during the summer months.

Ventilation requirements can vary by industry and types of product stored. For example, buildings handling hazardous fumes require more involved ventilation systems. And warehouses holding pharmaceuticals and certain dry goods require specific humidity levels.

When examining a warehouse listing, consider whether it provides natural and/or mechanical ventilation. Natural ventilation methods include windows, louvers, and gravity vents. Mechanical ventilation includes fans, ducts, and other systems to control airflow in and out of the building. In a warehouse listing, look for system components (such as high-volume or low-volume fans), physical locations of vents (such as roof or walls), and performance metrics, such as air changes per hour (ACH) or cubic feet per minute (CFM—the volume of air a system can move).

HVAC systems are important to note for maintaining proper conditions for storing different products. Standard warehouses typically do not have air conditioning because of the high operational costs of cooling large storage facilities with a significant amount of open space. They may or may not have heating systems.

HVAC systems can affect inventory control, as products sensitive to heat and cold may require certain minimum standards. When evaluating a warehouse listing, it’s important to take into account HVAC coverage (does it reach all storage zones or only office areas?), efficiency ratings (HSPF, SEER and AFUE), and the type of system (i.e. rooftop unit, split system, or unit heater).

7. Sprinkler System Type

Commercial warehouses typically have one of six types of fire sprinkler systems: wet pipe system, dry pipe system, pre-action system, deluge system, in-rack system, or ESFR system.

Wet pipe systems are the most common type. Dry pipe systems are able to withstand freezing temperatures and work well for warehouses with cold storage facilities or unoccupied buildings. Pre-action systems are best for items with sensitive storage requirements, such as libraries, IT equipment rooms, and museums. Deluge systems flood areas quickly and are used in warehouses that could be hazardous, such as aircraft hangars or chemical plants. In-rack sprinkler systems are built into the racking and are ideal in a warehouse design that consists of solid shelving, as they allow water to reach every area of the room quickly. And ESFR sprinkler systems are modern, high-quality sprinklers that are usually found in newer buildings and release water 2-3 times as fast as most other sprinkler systems.

The type of products or equipment you store, size of the building, potentially hazardous materials, warehouse layout design, and ceiling height are all factors that play a role in determining which type of warehouse sprinkler system is best.

8. Power Supply

Adequate power supply is a key factor that dictates whether or not a warehouse can support the functions and equipment your business requires. Power supply is typically identified by available voltage (such as 208V, 240V, 480V), amperage (how many amps are provided to the building), and the type of service (single-phase for basic operations or three-phase for heavy operations).

When considering a warehouse, check the listing for voltage and amperage details. This is critical to maintaining adequate power, operational efficiency, and overall safety as well as avoiding frequent outages and equipment malfunctions.

While small distribution warehouses might only need 200-400 amps at 240V, large warehouse operations may need 2,000 amps or more and three-phase service for stable, high-load operation.

9. Dock Doors, Drive-Ins, and Access Points

Having the right amount of dock doors, drive-in doors, and access points is critical to ensuring smooth warehouse processes and operational efficiency.

Dock doors are designed for truck loading and unloading and are elevated above ground level, typically with 8-10 foot doors.

Drive-in doors are ground-level access points that accommodate forklifts, pallet jacks, or other vehicles.

The number of dock doors, warehouse truck berths, and drive-in doors that a warehouse needs depends on a building’s use—for example, whether it’s used as a distribution center or a storage facility. Other access points, such as employee and visitor entrances, should also be considered, as they affect workplace traffic patterns and security.

A proper warehouse layout allows for streamlined loading and unloading with reduced bottlenecks and quicker turnaround times.

10. Zoning/Use Restriction

More than just design features, understanding a building’s zoning is an extremely important part of the decision-making process when choosing a warehouse space. Industrial zoning is typically broken down into light industrial and heavy industrial, but each locale has different zoning categories and requirements.

In the metro Charlotte area, common industrial zoning categories include ML-1 (typically used for light industrial), ML-2 (hazardous or noxious industrial uses), I-1 (light industrial), and I-2 (heavy industrial).

Re-zoning a property is a long, expensive process that comes with no guarantees, so it’s a good idea to ensure a property is zoned correctly for your business before closing on a lease.

FAQs About Reading Warehouse Specifications

What is the normal height of a warehouse?

While older warehouses tend to have clear heights of 20’ or less, new, Class A warehouses are being built with clear heights of 32’-36’ and even higher. 

Increasing the clear height of a building by just 4’ can increase the overall capacity of a warehouse by 10%-25%. Because of this, it’s vital to consider clear height when choosing a warehouse to lease or buy. 

What is cubic storage capacity in a warehouse? 

Cubic storage capacity is the total amount of usable storage space in a building. To find cubic storage capacity, multiply:

Usable Square Footage x Clear Height (in feet)

How does column spacing affect storage capacity in a warehouse?

The distance between columns (vertical supports) in a warehouse affects racking size as well as forklift paths. Wider columns typically allow for increased storage density, optimal rack configurations, and better loading efficiency.

What is floor load capacity? 

Floor load capacity is the total weight a floor can hold, including dead load and live load. Knowing the amount of weight a floor can support is vital for planning and preventing structural disasters. 

What types of warehouses are most common in Charlotte, NC?

Charlotte has a mix of older warehouse buildings as well as modern, Class A new builds. Common types of warehouses in the metro Charlotte area include storage and distribution centers (especially near the Charlotte Douglas International Airport), 3PL warehouses, light industrial facilities, assembly warehouses, cold storage properties, and industrial outdoor storage properties.

Find Your Next Charlotte Warehouse Lease With Regent CRE

Remember, understanding warehouse specs leads to smarter leasing decisions, improved operations, and room for future growth. At Regent Commercial Real Estate, we’ve worked with hundreds of clients to find just the right space, and we understand the many details that go into choosing the ideal property.

When choosing a building, warehouse specs are just the beginning. Cost, lease terms, proximity, and security are just a few more important warehouse lease factors to consider.

If choosing the right space feels overwhelming, we’re here to help. With over 10 years of experience in the greater Charlotte, NC area and nearly 1000 successful lease and sales transactions under our belts, we can help you analyze each aspect of a building and make sure you find the best space to fit your needs for both present and future operations.

Explore warehouse space in Charlotte or contact us today to get started.