What InPlant Offices does

InPlant Offices, Incorporated is a privately held U.S. manufacturer of custom prefabricated in-plant modular buildings, interior partition wall systems, equipment enclosures, modular cleanrooms, and portable booths and shelters. Founded in 1987 and headquartered at a climate-controlled manufacturing facility in St. Louis, Missouri, the company designs and fabricates modular structures using interchangeable 3-inch steel or anodized aluminum structural framing systems (3SP-20, 3SP-16, 3AP) paired with insulated wall panels available in multiple finishes and fire ratings. Specialized product lines include LASER BLOCK light-tight enclosures conforming to ANSI Z136 and FDA/CDRH standards for Class IV laser safety, and modular cleanroom systems delivered through partnerships with cleanroom design and construction specialists.

The company serves enterprise customers across industrial manufacturing, automotive, retail, government, and warehouse/distribution end markets, with named accounts including the world's largest retailer, multiple auto manufacturers, secure government facilities, and warehouse operators. Revenue is generated through one-time project-based sales priced via custom quotes, with installation handled either directly or through a nationwide representative and authorized material-handling dealer network organized into 8 U.S. regional territories. Standard order lead times run 5-7 weeks from quote approval, and products qualify as equipment under IRS Section 179 for accelerated depreciation by the buyer. The firm operates with 11-50 employees, has no external funding, no parent company, and no disclosed M&A activity, indicating a self-funded, owner-operated specialty manufacturer.

Name

InPlant Offices

Legal name

InPlant Offices Incorporated

Website

https://inplant.com

Company type

Private

Founded year

1987

Operating status

Operating

Headcount range

11–50 employees

Short description

InPlant Offices, founded 1987 and headquartered in St. Louis, Missouri, is a privately held manufacturer of custom prefabricated modular in-plant buildings, partition wall systems, cleanrooms, laser safety enclosures, and portable booths, serving industrial, automotive, government, and retail enterprise customers across the U.S. through a regional rep and dealer network.

Ownership category

akta.pro rank

Product category

Prefabricated Modular Buildings

NAICS

Office Furniture (except Wood) Manufacturing (337214), Showcase, Partition, Shelving, and Locker Manufacturing (337215)

SIC

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

akta.pro primary industry

Modular/Offsite General Contracting & Installation (IMAFAAAK)

akta.pro secondary industry

Industrial & Cleanroom Fit-Out (Factories, Warehouses, Controlled Environments) (IMAFANAF)

Keywords

• Prefab modular buildings
• Partition wall systems
• Equipment enclosures
• Cleanroom construction
• Portable guard booths

Headquarters

HQ city

St Louis

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, Infrastructure

Revenue model

1. Modular Building Systems Sales: Custom prefabricated modular office buildings and partition wall systems sold directly to customers. Buildings can be configured as one-story, two-story, or with rooftop storage. Products are manufactured to order with customization based on customer specifications.
2. Equipment Enclosures: Custom protective enclosures for equipment, machinery, lasers, and safety barriers. Includes laser enclosures conforming to ANSI standards, machine room enclosures, and safety wall systems.
3. Portable Booths and Shelters: Pre-assembled portable office buildings, guard shacks, ticket booths, parking booths, toll booths, control rooms, and operator cabs shipped fully assembled.
4. Cleanroom Systems: Modular cleanroom and controlled environment systems for pharmaceutical, medical, agricultural, and manufacturing applications. Partners with specialists for air handling and ISO compliance.
5. Installation and Project Management Services: Nationwide rep and dealer network provides project management through installation, or simple oversight as required. Includes CAD drawings, installation instructions, and ongoing support.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

InPlant Offices manufactures custom prefabricated modular office buildings, partition wall systems, equipment enclosures, modular cleanrooms, and portable booths/guard shacks. Products are built in steel or anodized aluminum framing with 3-inch thick insulated wall panels and are sold as one-story, two-story, or rooftop-load configurations. The company offers project management through installation via a nationwide dealer network and ships portable units fully assembled.

Product overview

InPlant Offices manufactures prefabricated modular building systems and partition wall solutions for commercial and industrial applications. The product portfolio centers on modular office buildings and wall systems (available in painted steel or anodized extruded aluminum), complemented by specialized equipment enclosures, laser safety rooms (LASER BLOCK), modular cleanrooms, and portable booths/guard shacks. Building systems come in three structural variants (Standard Steel 3SP-20, Heavy-Duty Steel 3SP-16, and All-Purpose Aluminum 3AP) with matching 3-inch thick wall panel options including painted gypsum, vinyl-faced, steel-faced, FRP-faced, and cement board. Products are customizable, relocatable, and expandable with nationwide dealer network installation services. Since 1987.

Differentiator

Problem solved

Functional benefit

Brands

• LASER BLOCK: Light-tight safety enclosures for laser equipment conforming to ANSI Z136 standards and FDA/CDRH compliance.

Quantifiable outcome

• Load capacity up to 125 pounds per square foot for roof storage
• +3 more outcomes

Named customers4 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

Feature6 records

Partnerships

Three partnerships are on record, tiered core.

• Cleanroom Design and Construction SpecialistscoreStrategic or Co-development PartnerInPlant partners with leading cleanroom design and construction specialists to meet ISO cleanroom requirements. Partners assist with air handling equipment, ISO-rated classifications, code requirements, and installation of controlled environment systems.
• Laser Safety Equipment TechnicianscoreStrategic or Co-development PartnerInPlant partners with experienced laser safety technicians to ensure quality service, products, and safe working environments for LASER BLOCK enclosures. Partners ensure ANSI Z136 standards and FDA/CDRH compliance.
• Material Handling SpecialistscoreChannel Partner/ Reseller/ DistributorNationwide network of authorized distributors who are material handling specialists that provide sales, project management, and installation services for InPlant modular buildings and wall systems across 8 regional territories.

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Starrco: Specialty manufacturer of modular offices, cleanrooms, and pre-assembled buildings for industrial and laboratory environments — closely comparable product portfolio and customer use cases to InPlant.
• National Partitions: Direct competitor producing modular offices, partition walls, and cleanrooms for warehouses, manufacturing plants, and government facilities — same product category, similar custom-configure-and-install model.
• Trendway: Manufacturer of office furniture, demountable walls, and modular office systems primarily for commercial and institutional settings — competing in the office partitions and modular workspace category.
• Panel Built: Manufacturer of prefabricated modular offices, mezzanines, cleanrooms, and equipment enclosures for industrial facilities — competes head-to-head in the same in-plant office and partition wall category with similar dealer-based GTM.
• Porta-King Building Systems: Direct competitor manufacturing prefabricated modular buildings, in-plant offices, cleanrooms, and equipment enclosures using similar steel-and-panel construction — overlapping product line, customer base (industrial/warehouse), and project-based channel model.
• Cleanroom International: Specialty modular cleanroom manufacturer for pharmaceutical, medical, and industrial applications — directly overlaps with InPlant's modular cleanroom product line and controlled-environment customer segment.
• Allied Modular Building Systems: Manufacturer of modular in-plant offices, two-story structures, partitions, and equipment enclosures for industrial customers — comparable product mix, materials (steel/aluminum framing), and quote-based custom sales motion.

Broad incumbents

• Haworth: Large-scale manufacturer of office furniture, modular walls, and architectural interiors — broad portfolio with prefabricated room and partition products that overlap with InPlant's modular office and partition wall offerings.
• DIRTT Environmental Solutions: Larger, publicly-traded manufacturer of prefabricated interior modular wall systems with a digital configurator — competes in the same modular walls/cleanroom space but serves a broader commercial/institutional base with a more tech-enabled model.
• Steelcase: Global office furniture and architectural interiors incumbent with modular walls, prefab rooms, and workstation systems — much larger scale but overlaps in modular office products for commercial/industrial customers.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/inplant-offices

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

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 InPlant Offices