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Portable and Prefabricated Buildings Frequently Asked Questions

How quickly can I get a modular building delivered?

Typically, in-stock standard plan buildings can be delivered the following business day. For buildings that require customization, the delivery time will vary based upon the extent of the modifications.

What if I want to have my modular building moved after the initial installation?

Whether on site, or between cities, Mobile Modular will arrange for relocation of your modular buildings. By contacting your local Mobile Modular office at 800-944-3442 or through our On-Line Request Service Form all of the necessary arrangements can be made including site visits, time frames, and all transportation and site related work.

How much notice should I provide prior to requesting to have my modular building returned?

We request that a 30-day notice be provided. However, we understand that there may be times in which a customer may require an earlier removal date. In these instances, we work with each customer to do everything within our power to accommodate their needs.

How can I tell if a modular building will fit on my site?

The best way to insure that a particular size of building will fit on your site is to contact Mobile Modular and request a site visit. We will have a representative come to your site to assess both the proposed building location, as well as the access route to be taken. This is the safest method to determine whether or not a building size is suitable for your site conditions. Under certain circumstances, a nominal fee may be charged for this service. To contact your local Mobile Modular office call 800-944-3442 or Email Us.

What should I know when considering a modular building for my site?

There are a variety of items to considering when thinking about using a modular solution for your project. Our representatives can answer your questions and share information to help you in your process. You can also refer to the below worksheet to prompt additional considerations.

How much space do I need to accommodate delivery of a container?

While we can work with you to deal with challenging site conditions or obstacles, there are some general guidelines for delivery clearance. The attached specifications sheet provides information on our variety of sizes.

What is the range of modular building sizes that can be ordered?

Mobile Modular has a wide array of standard sizes in stock and ready for delivery, an example of these is provided below. If you need a unique size, smaller or larger than the below, we can provide a building to suit your purpose. Standard building sizes range from:


  • Standard Single-Wides - 8'x20' (160 Sq.Ft.) to 12'x60' (720 Sq.Ft.)
  • Multi-Module Complexes - 24'x40' (960 Sq.Ft.) to 210'x120' (25,200 Sq.Ft.) and larger

Arkansas, Louisiana, Oklahoma, Texas

  • Standard Single-Wides - 8'x20' (160 Sq.Ft.) to 14'x70' (980 Sq.Ft.)
  • Multi-Module Complexes - 24'x32' (768 Sq.Ft.) to 210'x120' (25,200 Sq.Ft.) and larger


  • Standard Single-Wides - 12'x40' (480 Sq.Ft.) to 12'x56' (672 Sq.Ft.)
  • Multi-Module Complexes - 24'x36 (864 Sq.Ft) to 144'x56 (8064 Sq.Ft)

Alabama, Delaware, Georgia, Maryland, North Carolina, Pennsylvania, South Carolina, Virginia, Washington, D.C., West Virginia

  • Standard Single-Wides - 12'x42' (504 Sq.Ft.) to 12'x56' (672 Sq.Ft.)
  • Multi-Module Complexes - 24'x56' (1,344 Sq.Ft.) to 60'x60' (3,600 Sq.Ft.) and larger

What is the cost per square foot to buy a modular building?

The cost will vary based upon both the size and level of customization of the building. By contacting your local Mobile Modular office at 800-944-3442 or through our Online Request A Quote page, a salesperson can review your building requirements and provide you with an appropriate price.

What is the cost per square foot to rent a modular building?

The cost will vary based upon the size, level of customization and length of rental term. By contacting your local Mobile Modular office at 800-944-3442 or through our Online Request A Quote page, a salesperson can review your building requirements and provide you with an appropriate price.

When I add a building to my "Quote Cart", am I obligated in any way?

No. You are just requesting quotation information on selected buildings to assist you in your procurement decision making process.

How do I select the most cost-effective and appropriate building for my needs?

Selecting a building that is already closely configured to your floor plan needs (i.e. - # of private offices, # of restrooms, placement of exterior doors and windows, etc.) will provide you with the most cost-effective pricing and quickest delivery schedule. If you require specific information regarding occupancy code requirements for educational, assembly, childcare, general office space or any other usage, we can provide you with guidance and information that will assist you in selecting the most appropriate building from our inventory. Our buildings can be modified by our production staff to include any missing features that you desire.

We suggest you search the database and as you find a building that suits your needs move it to the Quote Cart. When you have several possibilities that will meet your needs, call us directly at 800-944-3442. Together, we can review your selections and determine the building or buildings that are best suited for your needs. You can then complete your online request. During non-business hours simply submit your selections and we’ll get back to you first thing the next business day.

What if I can't find the exact building I am looking for?

Mobile Modular can customize a building to meet your specific needs. We have the largest and most advanced state-of-the-art production facilities and skilled workforce in the industry for modifying modular buildings. We are able to provide virtually any modification including, adding doors, windows, interior partitioning, restrooms, floor coverings, special heating/air-conditioning/ventilation and customer specified exterior / interior wall finishes. Due to the investment we have made in our production infrastructure, we can turn-around customization work very quickly so that we can meet your delivery schedule.

It still will serve you to find a building size and floor plan from our inventory that comes closest to what your requirements are. You can then specify in the "Comments" box in the "Quote Cart" what additional features you desire. Buildings are scheduled to come back all the time, but would not yet appear on the inventory. One of these might just fit your needs.

How many buildings may I request a quote on?

There is no stated limit. However, unless you require different building sizes, specifications, or floor plans, you would only need to submit one building for quotation.

What happens if I am not sure of which regional inventory center in which to browse for buildings?

You should select the inventory center that is closest to the site where the building will be located. For California, site locations that are north of and include San Luis Obispo extending east to the Nevada border are handled by the Northern California inventory center. Site locations to the south of San Luis Obispo extending east to the Nevada border are handled by the Southern California inventory center.

How quickly will I receive my quotation information?

In virtually all cases a representative will contact you within one (1) hour of our receipt of your request, during normal business hours.

What if I experience a problem with my rented modular building?

Mobile Modular has the most extensive field service team in the industry. We have our own staff of modular building mechanics and fleet of service vehicles. If you should experience a problem with your modular building, simply call us at 800-944-3442 or use our On-Line Request Service Form. We will respond to your request promptly and work to complete the repairs as soon as possible.

Mobile Modular also provides field service for purchased buildings beyond their original warranty period and for other customer-owned buildings. Customers will be charged on a time and material basis based on the extent of work required.

Can I continue to rent beyond my original contracted rental term?

Yes, following the completion of your initial rental term you may continue on a month-to-month basis, or extend the term for a specific period of time. In the event you are continuing beyond the original term, the rental rate and dismantle/return delivery charges may be adjusted to reflect current market conditions. If you have questions regarding the extension of your rental term, contact us at 800-944-3442 or Email Us.

Are there insurance requirements associated with renting a modular building?

Yes. Customers are required to provide the following insurance coverage:
  • Comprehensive - Coverage for the loss, theft, destruction or damage of the building in an amount not less than the full replacement value as stated in the rental agreement
  • Liability: Public liability insurance with a minimum coverage amount of $1,000,000 per occurrence

What if I determine that I want to purchase the modular building I am currently renting?

If you wish to purchase the modular building you are currently renting, simply contact us at 800-944-3442 or Email us. At the time of contacting us, please have your lease contract number available (the contract number is noted on all Mobile Modular documents). We will gladly provide you with a purchase price.

Do stairs or ramps come with the modular building?

Standard stairs and handicapped access ramps/landings are available for rent with all buildings. Standard stairs will require final placement by the customer and adjustment to the threshold of the door or to grade. The customer is responsible for completing these adjustments, unless contracted for separately with Mobile Modular. Handicapped access ramps and landings can be provided by Mobile Modular to meet your requirements.

Can Mobile Modular make arrangements for electrical, plumbing and other site related work?

Yes. Mobile Modular can arrange for site related construction work including foundation systems, utility connections, skirting, ramps, stairs, permit processing, canopies, fire sprinkler systems and project management.

Is a permit required to place a modular building on your property?

It depends. Some local building departments require permits for modular buildings and others do not. We advise each customer to check with their local building department to make a final determination. We are happy to assist you in addressing any permit requirements that you may need to satisfy the appropriate approval agency; including special foundation systems, ramps, and fire alarm systems.

How many square feet should I use per person to calculate a building size?

The building code requirements and the customer's comfort level with specific sizes of work or activity space are the most important items to consider when determining an appropriate building size. There are some standard square footage guidelines for different building uses listed below that can assist you in determining an approximate building size.
  • Education (Classroom) - 30 sq.ft. per student
  • General Office Space - 100 sq.ft. per person
  • Assembly Space - 15 sq.ft. per person

Will modular buildings meet all of the appropriate building codes?

Local building departments may require that foundation systems to be used in conjunction with the modular building installation meet either permanent or temporary standards. In addition, local building and planning departments have responsibility for determining the standards for handicapped access, site utilities and aesthetic elements (paint colors, roofline treatments, etc.). Mobile Modular is very experienced in working with local building authorities and can assist our customers in dealing with these agencies, as well as providing for any additional items that may be required.
  • California Buildings - All of Mobile Modular's buildings are approved by one of three different agencies: Department of Housing and Community Development (DOH), Division of the State Architect (DSA) or Department of Motor Vehicles (DMV). Each of these agencies has pre-emptive authority for the construction requirements for buildings falling under their respective jurisdiction.
  • Florida Buildings - All of Mobile Modular's buildings are approved by the Department of Community Affairs (DCA) and education buildings are also approved by Clemons, Rutherford and Associates (CRA). Each of these agencies ensures that such units, systems, or component parts are in full compliance with the Florida Building Code.
  • Mid-Atlantic Buildings - All of Mobile Modular's buildings in the Mid-Atlantic are approved for North Carolina Department of Insurance (NCDOI), Georgia Department of Community Affairs (DCA), Virginia Department of Housing and Community Development (DHCD), and Maryland/District of Columbia Department of Housing and Community Development (DHCD). Each of these agencies has pre-emptive authority for the construction requirements for buildings falling under their respective jurisdiction.
  • Texas Buildings - Although Mobile Modular has available both Texas Department of Licensing and Regulation (TDLR) decal and International Building Code Congress (IBCC) buildings, these agencies do not have preemptive authority for the construction of modular buildings. Prior to arranging for shipment of a building, it is important for customers to verify with their local building department what construction standards are required. Mobile Modular typically can comply with these requirements and will work with the local building department to meet their standards.

How long will a modular building last?

Mobile Modular's buildings are built to meet building codes that are very similar to those required of conventionally constructed buildings. Further, Mobile Modular requires significantly higher standards for the construction of its entire rental product. This means provided a modular building is maintained in an appropriate manner, its life span should be consistent with that of conventional structures.

Do the buildings come with electrical outlets?

Yes, Mobile Modular's buildings come with electrical outlets. Typically, on standard buildings duplex outlets are placed on perimeter walls and are spaced approximately every 12'. On customized building floor plans electrical outlets can be provided for either wall-mounted or floor mounted access to serve private offices, computer network storage areas, open work areas, kitchen appliances, restroom facilities or any other special needs of the customer.

Do they have heating and air-conditioning?

Yes, virtually every building comes equipped with a heating and air-conditioning (HVAC) system. Most buildings have end wall HVAC units (some buildings have roof-mounted) which are ducted above the ceiling to provide ventilation to different parts of the building. On the smallest building sizes the HVAC unit is a free-blow system.

Are they insulated?

Yes, Mobile Modular's buildings are insulated to meet various building code and energy efficiency requirements.

Do they have to look like a trailer?

No. By utilizing various options offered by Mobile Modular your modular building can look as permanent as conventionally built structures. Elements such as skirting, canopies, custom rooflines, recessed or pit set installations and storefront window/door treatments are available to enhance the look of permanency of the building. By visiting the Photo Library you can view installations with these different treatments.

How much does a container weigh?

The empty weight of a container varies, the below specification sheet will give you an indication of what to expect.