What Porta-King Building Systems does

Porta-King Building Systems, a division of Jay Henges Enterprises, Inc., is a privately held US manufacturer of prefabricated modular buildings founded in 1969 and headquartered at 4133 Shoreline Drive, Earth City, Missouri. The company operates 160,000 square feet of combined manufacturing space across two facilities and has been in continuous operation for over 50 years, producing the broadest product portfolio it claims of any US modular/prefabricated building manufacturer in its category.

Its core offering spans seven product families: modular rooms and offices (control rooms, break rooms, conference rooms, inplant offices, warehouse and factory offices); modular cleanrooms classified to ISO 5-8 with non-shedding finishes; modular walls and partitions including cleanroom walls and tall walls up to 40 feet; guard booths and ballistic-rated security buildings (U.L. 752 Levels 1-8, NIJ Levels I-IV); preassembled buildings (toll booths, scale houses, operator booths, restrooms, press boxes); equipment enclosures (motor control, switchgear, pump, machine, laser); plus shelters, mezzanines, and observation towers. Underlying technology centers on pre-engineered wall panels built around solid insulating cores (EPS at one-pound density delivering R-10, or optional polyisocyanurate at R-20), surfaced with vinyl-covered drywall, painted steel, FRP, HPL, or PVC, with sound transmission ratings up to STC 47 and 48 dB average reduction.

The business model is primarily capital equipment sales of factory-built components shipped from Earth City for either customer or third-party installation, supplemented by installation services and custom design/engineering work. Pricing is project-based and quote-driven, with modular structures qualifying as capital equipment for accelerated depreciation, and standard lead times of 4-5 weeks on inventoried materials. Go-to-market is sales-led via phone-based representatives (888-210-3526, 888-481-1671), regional sales managers conducting on-site visits, an e-commerce shop, and a third-party installer network across North America. Customers span manufacturing/industrial, warehouse/distribution, pharmaceutical/medical device, security/government, and commercial/retail verticals, with named users across automotive, EV, aerospace, technology, retail, food service, healthcare, and US federal defense and law enforcement.

Name

Porta-King Building Systems

Legal name

Porta-King Building Systems, A Division of Jay Henges Enterprises, Inc.

Website

https://portaking.com

Company type

Private

Founded year

1969

Operating status

Operating

Headcount range

11–50 employees

Short description

Porta-King Building Systems is a US manufacturer of prefabricated modular buildings founded in 1969 in Earth City, Missouri, serving manufacturing, warehouse, pharmaceutical, defense, and commercial customers with offices, cleanrooms, guard booths, equipment enclosures, mezzanines, and towers.

Ownership category

akta.pro rank

Product category

Prefabricated Modular Building Systems

NAICS

Showcase, Partition, Shelving, and Locker Manufacturing (337215), Office Furniture (including Fixtures) Manufacturing (33721), Commercial and Institutional Building Construction (236220)

SIC

Prefabricated Metal Buildings & Components (3448), Partitions, Shelvg, Lockers, & Office & Store Fixtures (2540)

akta.pro primary industry

Modular/Offsite General Contracting & Installation (IMAFAAAK)

Keywords

• Prefabricated modular buildings
• Modular cleanroom systems
• Inplant office construction
• Guard booth manufacturing
• Modular equipment enclosures

Headquarters

HQ city

Earth City

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Marketing or Sales, Technology or R&D

Revenue model

1. Prefabricated Building Sales: One-time sales of prefabricated modular buildings including modular offices, control rooms, cleanrooms, guard booths, equipment enclosures, shelters, mezzanines, and towers. Products are shipped as pre-engineered components or factory-assembled units for installation by customer or third-party installers.
2. Installation Services: On-site installation, offloading and anchoring services available throughout North America via third-party installers and company-affiliated installation teams.
3. Custom Design Services: Custom design and engineering services for modular buildings. On-site support before, during, and after installation included as part of sales process.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

Porta-King Building Systems designs, manufactures, and ships prefabricated modular building systems for industrial, commercial, government, and security applications. Core offerings include modular inplant offices, ISO-classified cleanrooms, modular wall partitions, guard booths and ballistic-rated security buildings, preassembled structures, equipment enclosures, shelters, mezzanines, and observation towers. Products are custom-engineered in Earth City, Missouri and shipped as pre-engineered components or factory-assembled units for installation by the customer or third-party installers.

Product overview

Porta-King Building Systems offers a comprehensive portfolio of prefabricated and modular building solutions. The company's offerings include: Modular Rooms & Offices (control rooms, break rooms, conference rooms, restrooms, inplant offices, warehouse and factory offices); Modular Cleanrooms classified to ISO 5-8 standards for pharmaceutical, medical device, semiconductor, and precision manufacturing; Modular Walls & Partitions (office partitions, freestanding walls, cleanroom walls, tall walls up to 40 feet); Guard Booths, Guard Houses & Security Buildings with ballistic-rated options; Preassembled Buildings (toll booths, outdoor restrooms, scale houses, operator booths, parking booths); Modular Equipment Enclosures (motor control, switchgear, pump, machine, and laser enclosures); Shelters (vestibules, stair enclosures, smoking shelters); Mezzanines; and Observation Towers. All products are designed, manufactured in Earth City, Missouri, and shipped for rapid installation with reusable, reconfigurable components.

Differentiator

Problem solved

Functional benefit

Products and services

• Modular Rooms & Offices

Quantifiable outcome

• Construction time reduced by 50% compared to conventional construction
• +4 more outcomes

Named customers27 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• Cleanroom Certification SpecialistscoreImplementation/ SI/ Consulting PartnerFor cleanroom applications requiring ISO certification, Porta-King engages cleanroom specialists who have the knowledge and equipment necessary to construct, certify, and service these environments. Their outside sales team has established relationships with these contractors throughout the U.S. to deliver turnkey solutions.

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• WillScot: Largest North American provider of modular space and portable storage, offering a national fleet of mobile offices, modular buildings, and storage containers with turnkey installation. Highly comparable product category but at vastly greater scale, broader geographic reach, and with in-house financing.
• Algeco (Modulaire Group): European-headquartered modular space provider with a North American presence offering portable and modular buildings across industrial, commercial, and public-sector segments. Comparable modular building category with substantially larger scale and broader geographic reach.
• ATCO Structures: Global provider of modular space solutions including workforce housing, offices, schools, and industrial buildings. Highly comparable modular building product, with substantially larger scale and international footprint than Porta-King.

Direct peers

• Triumph Modular: Modular construction provider focused on multi-story commercial and institutional modular buildings. Comparable modular construction methodology, though Triumph is more weighted to larger commercial/institutional projects versus Porta-King's industrial concentration.
• Ramtech Building Systems: Modular building manufacturer serving commercial, educational, healthcare, and industrial markets with relocatable and permanent modular construction. Comparable modular construction approach and customer verticals, particularly in cleanroom-adjacent environments.
• National Partitions: Manufacturer of modular inplant offices, cleanrooms, and industrial buildings using pre-engineered wall systems. Directly overlaps with Porta-King's core inplant office and cleanroom lines, targeting the same manufacturing customer base.
• Allied Modular Building Systems: Manufacturer and installer of modular offices, exterior buildings, two-story structures, mezzanines, and cleanrooms. Direct overlap on product range and customer base, with a particular focus on the inplant office and mezzanine segments.
• Starrco: Prefabricated modular office and cleanroom manufacturer offering pre-engineered wall systems with sound and thermal control. Closely comparable technology and product range, focused on the same inplant/cleanroom customer segments.
• Panel Built: Manufacturer of modular offices, mezzanines, cleanrooms, and equipment enclosures with pre-engineered wall panel systems. Most direct head-to-head competitor in the inplant office and mezzanine space, serving similar manufacturing and warehouse customers.

Emerging players

• Coresix Precision Manufacturing (cleanroom wall panels): Manufacturer of cleanroom wall and ceiling systems for pharmaceutical, semiconductor, and biotech facilities. A more focused cleanroom specialist that overlaps with Porta-King's modular cleanroom product line.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/Porta_King
• Facebookfacebook.com/159427238861
• LinkedInlinkedin.com/company/porta-king-building-systems

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Porta-King Building Systems