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Modular Building Inspection Services

UL Solutions offers inspections for life safety systems and equipment in modular buildings prior to shipping, helping to solve the challenge of reviewing these systems during construction.

Crane lifting a prefabricated wooden building module to its position in the structure

Inspecting life safety systems and equipment in modular building units before shipping for construction helps architects, building manufacturers, building owners and code officials make informed decisions about improvements needed to meet code requirements.

Through our modular building inspection services, UL Solutions witnesses the construction of the modular unit before shipping. We observe various building systems in operation to assess whether fire, life safety and security systems will operate as designed in the event of an emergency once they are assembled at the installation site.

We utilize a detailed, rigorous inspection process that results in an objective report of compliance gaps so you can make informed decisions before shipping.

UL Solutions modular building inspection services helps provide peace of mind that fire and life safety systems have undergone objective inspection, demonstrating a commitment to safety.

Achieve compliance for your modular building’s life safety systems to construction code requirements

Successfully navigating the complex issues of regional code requirements and emergency response tactics can prove challenging, but can save money when executed correctly and at the right time.

It is important for modular buildings to be safe and to operate efficiently. That is no easy task. It takes a thorough understanding of complex issues, including regional code requirements, hidden maintenance needs and emergency response tactics.

UL Solutions has the expertise to assist you in optimizing the compliance of your modular building’s life safety systems to international code requirements. A key issue is that when a modular building is constructed at an off-site location, the local code official cannot review or witness the critical systems and equipment located within walls or behind panels.

UL Solutions experts can inspect these systems and equipment before you ship the unit for compliance with applicable requirements.

By inspecting systems and equipment before the unit ships, our building inspection services help provide peace of mind that fire and life safety systems have undergone objective inspection. Relevant codes and standards are based on both international and local regulations, such as:

  • ICC building and fire code
  • National Electrical Code® (NEC®)
  • NFPA 5000®, Building Construction and Safety Code®
  • NFPA 1, Fire Code
  • NFPA 101®, Life Safety Code®
  • NFPA 855, Standard for the Installation of Stationary Energy Storage Systems
  • UL 3401, Outline for 3D Printed Building Construction
  • UL 3223, Outline of Investigation for Data Center Certification

UL Solutions will take these steps to help you ensure that your modular and traditional buildings comply with the relevant codes:

  • Peer plan review
  • Factory inspections of units (on-site and remote)
  • Certificate of inspection for each factory-built unit
  • Installation site review (upon request)

We offer numerous building life cycle services, including: Factory inspection, precommissioning, training, annual life safety reviews, and review and assessment of building security needs.

Demonstrate your commitment to safety through your modular buildings

UL Solutions understands complex construction requirements around the world, and we customize our modular inspection services to meet customers’ individual needs.

We perform customized inspections of modular building and equipment units to help you ensure that the unit systems perform their critical functions to protect lives and enable business continuity.

Around the world, building and fire code officials turn to UL Solutions for trusted, code-complainant support based on rigorous testing and inspection. We certify and inspect fire, electrical and life safety security product installations while providing in-depth knowledge of local, national and international codes and regulations. UL Solutions operates in an array of global locations with a full range of services from design to site inspection.

For modular and traditional buildings, UL Solutions offers a range of inspection services

Fire safety


  • Occupancy classification or equipment designation
  • Types of construction identification
  • Site location limitations for unit height and coverage
  • Energy storage system (ESS) protection
  • Emergency access routes and open spaces
  • Fire compartmentation
  • Openings in fire-rated walls and floors
  • Smoke control and venting
  • Interior finish surfaces

Life safety


  • Exit systems
  • Egress ramps
  • Emergency and escape lighting
  • Illumination and marking of means of egress
  • Fire detection and early warning equipment
  • Emergency procedures plan

Fire protection systems


  • Portable fire extinguishers
  • Sprinkler systems
  • Fire pumps
  • Standpipe and hose systems

Security systems


  • Intrusion alarm systems
  • Access control equipment
  • Closed circuit TV
  • Motion detectors
  • Video surveillance systems

FAQ

Where can you use the units after inspection?

Residential, commercial, agricultural, industrial, energy storage systems, data centers, cryptocurrency mining units and more

How can UL Solutions inspect all of my units even if they’re not on-site?

We can provide video inspection of future units once both UL Solutions and the manufacturing teams are satisfied with the equipment and the craftsmanship of the trades used for the installation and the product certifications and quality assurance process are initialized.

Where do you offer these services?

We offer these services in all 50 U.S. states and internationally. We have internally trained staff and a network of resources with deep expertise in local and global regulations. Our teams have conducted inspections throughout Europe, Asia and North and South America.