KSK

What KSK does

KSK (株式会社KSK 構造診断研究所) is a Japanese construction consulting firm founded in 2003 and headquartered in Toride, Ibaraki Prefecture, specializing in non-destructive testing (NDT) and lifecycle maintenance of concrete infrastructure. The company serves public infrastructure owners (national, prefectural, and municipal governments), private infrastructure operators, and smaller engineering firms, providing inspection, testing, deterioration prediction, repair design, and construction management services across the full concrete structure lifecycle. Its proprietary technology portfolio includes the J-System for thermal-based surface anomaly detection (NETIS SK-110019-VE, claimed unique in Japan with formal performance certification), an FBG fiber optic structural health monitoring system (NETIS KT-140134-A), drone-based inspection using Skydio and IBIS2 platforms, 3D laser scanning, and near-infrared spectroscopy for chloride ion measurement via IHI Infrastructure Systems' Concrete View device. KSK also licenses and integrates Fuji Film's HibiMikke cloud image diagnosis service for automated crack detection.

KSK monetizes through a mix of project-based professional services, recurring Maintenance Alliance Contracts (¥50,000/month or ¥600,000/year), equipment rental and sales via its wholly-owned Civile Rental division, technical staffing through Civile Haken and NeedsYours subsidiaries, and traffic regulation services via TKS (Toride Regulation Service). The go-to-market is sales-led, leveraging three regional offices in Toride, Matsudo, and Sapporo to serve Kanto, Hokuriku, Tohoku, and Hokkaido regions, with NETIS registrations as a primary competitive credential for public-sector procurement. The company maintains an ecosystem of partnerships with Fuji Film, IHI Infrastructure Systems, GSSI, Japan Aviation Electronics, and a network of university academic advisors, which collectively underpin its technical differentiation. Marketing is conducted through industry events, technical publications, the corporate website with categorized inquiry forms, and active recruitment campaigns on Mynavi, Jobree, and Instagram. The firm operates as a privately held corporation with 51-100 employees and no disclosed institutional ownership.

Name

KSK

Legal name

株式会社KSK　構造診断研究所

Website

https://www.k-s-k.co.jp/

Company type

Private

Founded year

2003

Operating status

Operating

Headcount range

51–100 employees

Short description

KSK is a Japanese concrete structure inspection and maintenance consultancy (founded 2003) serving public infrastructure owners, private operators, and engineering firms with non-destructive testing, deterioration prediction, and repair design across Japan.

Ownership category

akta.pro rank

Product category

Structural Inspection and Concrete Maintenance Consulting

NAICS

Building Inspection Services (54135), Building Inspection Services (541350)

SIC

Services-Engineering Services (8711), Services-Miscellaneous Equipment Rental & Leasing (7350), Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Road & Highway Authorities (Planning, Construction, Maintenance) (BPAIALAA)

Keywords

• Non-destructive testing
• Concrete structure inspection
• Structural health monitoring
• Infrastructure maintenance services
• Bridge inspection services

Headquarters

HQ city

Toride

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Technical Inspection & Consulting Services: Core revenue stream from concrete structure inspection, testing, analysis, diagnosis, maintenance planning, repair design, and construction management services. Services are provided to public infrastructure owners and private sector operators on a project basis.
2. Maintenance Alliance Contract: Monthly/annual subscription-style retainer contracts offering ongoing technical consulting, technical education, human resource support, coordination, and equipment rental at preferential rates. Priced at ¥50,000/month or ¥600,000/year.
3. Testing Equipment Rental & Sales: Rental and sale of non-destructive testing instruments, soil/concrete testing equipment, and environmental monitoring equipment. Dedicated rental division 'Civile Rental' established in 2014.
4. Staffing & Human Resource Services: Technical personnel dispatch and placement services including construction management personnel, licensed inspectors, and travel/escort staffing. Operated through subsidiary 'NeedsYours' (ニーズユアーズ).
5. Traffic Regulation & Security Services (TKS): Traffic guidance and security services for construction sites, operated through Toride Regulation Service (TKS) at the same headquarters location.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

KSK delivers integrated non-destructive inspection, testing, deterioration prediction, evaluation, repair design, and construction management services for concrete infrastructure such as bridges, elevated highways, tunnels, and port facilities. Services are sold on a project basis to public infrastructure owners (national, prefectural, and municipal governments) and private operators, supplemented by a recurring Maintenance Alliance subscription contract and an equipment rental/sales division.

Product overview

KSK (株式会社KSK構造診断研究所) is a concrete structure maintenance and inspection company offering a comprehensive suite of diagnostic technologies and services. Their core offerings include non-destructive inspection systems (J-System, FBG sensor monitoring), image-based analysis (ひびみっけ), drone inspection services, 3D point cloud scanning, and near-infrared spectroscopy. They provide the complete lifecycle of concrete structure management from planning, inspection, testing/analysis, deterioration prediction, evaluation, to countermeasures and maintenance alliance services.

Differentiator

Problem solved

Functional benefit

Products and services

• J-System (Jシステム) Concrete Surface Anomaly Detection A non-destructive inspection service that detects anomalous temperature areas on concrete surfaces to identify damage such as delamination and spalling. Used as primary screening for soundness testing (tap-sounding). Registered in NETIS (SK-110019-VE) and offered to public infrastructure owners and private operators for bridge, elevated structure, and concrete asset inspection.
• FBG Long Sensor Measurement/Monitoring System A fiber optic sensor monitoring service using Fiber Bragg Grating (FBG) technology to deliver high-precision, area-based, long-term, real-time measurement of strain and temperature in structures. Enables continuous structural health monitoring for bridges and infrastructure. Registered in NETIS as KT-140134-A.
• HibiMikke (ひびみっけ) Image Diagnosis Service Cloud-based image diagnosis service that uses image analysis technology to automatically detect cracks on concrete surfaces and convert results to CAD data (dxf files) for inspection documentation. KSK offers this as part of its inspection workflow. NETIS Registration No. KT-190025-VR.
• Near-Infrared Spectroscopy Concrete Deterioration Diagnosis Inspection service that uses near-infrared light to measure chloride ion concentration on concrete surfaces, particularly for coastal infrastructure and salt damage diagnosis. Uses the Concrete View device developed by IHI Infrastructure Systems and chemometrics analysis. Identifies areas with high chloride concentration for detailed investigation screening.
• Drone Inspection Service Structural inspection service using drones for bridges and confined spaces. Operates Skydio 2+ for bridge inspections in non-GPS environments and IBIS2 drones for narrow, dark confined spaces with collision-resilient flight control.
• 3D Point Cloud Data Service 3D scanning service using terrestrial and handheld laser scanners to capture 3D point cloud data for structural recording, shape (as-built) management, maintenance, and construction planning. Also applied to heritage site recording, disaster documentation, and building restoration records.
• Maintenance Alliance Contract A subscription-style retainer contract offering ongoing technical consulting, technical education, human resource support, coordination, and equipment rental at preferential rates for small-to-medium construction and engineering firms. Priced at ¥50,000/month or ¥600,000/year, with customization available based on service scope and inquiry frequency.
• Civile Rental Equipment Rental and Sales Rental and sale of non-destructive testing instruments, soil and concrete testing equipment, and environmental monitoring equipment. Operated through the dedicated 'Civile Rental' division established in 2014 with professional staff support.
• Technical Staffing and Dispatch (NeedsYours / Civile Haken) Technical personnel dispatch and placement services providing construction management personnel, licensed inspectors, and travel/escort staffing. Operated through subsidiary companies NeedsYours (ニーズユアーズ) and Civile Haken (シビル派遣).
• TKS Traffic Regulation and Security Service Traffic guidance and security services for construction sites, operated through the Toride Regulation Service (TKS) division at the KSK headquarters location.
• Technical Inspection, Diagnosis, Repair Design and Construction Management Services End-to-end technical services for concrete structures covering inspection, testing and analysis, deterioration prediction, evaluation and diagnosis, repair design, and construction management. Provided on a project basis to public infrastructure owners and private operators.

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

AI capability2 records

Feature6 records

Partnerships

Eight partnerships are on record, tiered core, key and minor.

• IHI Infrastructure Systems (IHI インフラシステム)coreTechnology or Integration · 1 January 2014KSK uses IHI Infrastructure Systems' 'Concrete View' device, developed for measuring chloride ion concentration on concrete surfaces using near-infrared spectroscopy. KSK applies this technology for coastal infrastructure inspection and chloride-induced deterioration diagnosis.
• GSSI (Geophysical Survey Systems, Inc.)keyTechnology or Integration · 1 January 2012KSK uses GSSI ground penetrating radar equipment (SIR-EZ XT and SIR-3000) for rebar detection, subsurface investigation, and buried object detection. SIR-3000 holds the world's top market share. Equipment registered in NETIS.
• Fuji Film (富士フィルム) - HibiMikke ServicecoreTechnology or Integration · 1 January 2011KSK uses Fuji Film's 'HibiMikke' (ひびみっけ) image diagnosis service as part of its inspection workflow. This service uses image analysis technology and cloud platforms to digitize and automate structural crack detection, converting results to CAD data (dxf files). Registered as NETIS KT-190025-VR. KSK integrates this technology into its own inspection service offering.
• University Professors and Expert AdvisorscoreStrategic or Co-development PartnerKSK maintains advisory contracts with multiple university professors and expert researchers in concrete engineering, structural engineering, and maintenance. These advisors provide technical guidance and research-backed expertise to support the company's inspection, diagnosis, and repair design services.
• Japan Aviation Electronics (日本アビオニクス) - Infrared ThermographykeyTechnology or IntegrationKSK distributes Japan Aviation Electronics infrared thermography cameras (G120EX/G100EX/G100 and R300SR series) as part of its equipment sales catalog, used for thermal inspection of concrete structures.
• NeedsYours (ニーズユアーズ)minorOthersRelated human resources dispatch company under the KSK network. Operates staffing services for engineers, inspectors, and travel/escort personnel. Referenced as a related business on the KSK website.
• Civile Rental (シビルレンタル)keyOthersSpecialized rental division for measurement and testing equipment, established in 2014. Part of KSK's related business network providing non-destructive testing equipment, soil/concrete testing instruments, and environmental monitoring gear to the construction industry.
• Civile Haken (シビル派遣)minorOthersCivil engineering personnel dispatch service. Part of the KSK group network for human resource services in the construction and infrastructure inspection sector.

Scale indicators1 record

Recent moves6 records

Expansion highlights5 records

Direct peers

• NDI Co., Ltd. (非破壊検査株式会社): Japan's leading dedicated non-destructive testing company, offering inspection services across industrial sectors including infrastructure. Directly comparable to KSK in NDT service offerings and Japanese customer base, though at significantly larger scale and broader industry coverage.

Broad incumbents

• CTI Engineering Co., Ltd. (株式会社建設技術研究所): Major Japanese engineering consultancy with established infrastructure inspection and asset management practices serving government clients. Comparable because it competes for the same public-sector bridge and infrastructure inspection mandates, though it offers a much wider portfolio.
• NEWJEC Inc. (株式会社ニュージェック): Japanese engineering consultancy with strong bridge and infrastructure inspection capabilities, often competing for government inspection contracts. Comparable to KSK on the bridge/concrete inspection service line but operates with broader engineering offerings.
• Chodai Co., Ltd. (株式会社長大): Engineering consultancy specializing in bridges, tunnels, and social infrastructure with inspection and asset management services. Highly comparable on bridge inspection use cases served to the same Japanese public-sector customer base.
• Pacific Consultants Co., Ltd. (パシフィックコンサルタンツ株式会社): One of Japan's largest engineering consultancies with infrastructure inspection, maintenance planning, and asset management services. Overlaps with KSK in serving public infrastructure owners on bridge and concrete structure lifecycle programs.
• Dai Nippon Consultants Co., Ltd. (大日本コンサルタント株式会社): Japanese engineering consultancy with infrastructure inspection and deterioration diagnostics capabilities serving public-sector clients. Comparable on the inspection and structural assessment service line.
• Nippon Koei Co., Ltd. (日本工営株式会社): Large Japanese engineering consultancy with infrastructure maintenance and inspection practices serving domestic and international clients. Overlaps with KSK on infrastructure inspection and lifecycle management for public-sector customers.
• Obayashi Corporation (株式会社大林組): Major Japanese general contractor with significant in-house infrastructure inspection and maintenance capabilities. Competes indirectly with KSK when clients bundle inspection with construction or repair work.
• Mistras Group, Inc. U.S.-headquartered, publicly listed non-destructive testing and inspection provider with infrastructure and industrial inspection services. Comparable in NDT technology deployment and inspection service model, though globally scaled.

Others

• Fuji Film Corporation (富士フイルム株式会社): Owner of the HibiMikke social infrastructure image diagnosis service that KSK integrates into its inspection workflow. Adjacent rather than competing — a technology supplier whose offering overlaps with KSK's inspection deliverables.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Instagraminstagram.com/ksk.corporation

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries4 records

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 KSK