What The Castle Group,LTD does

The Castle Group, Ltd is a UK-based manufacturer and service provider of occupational and environmental health and safety measurement instruments, founded in 1971 and headquartered in Scarborough, North Yorkshire. Its core offering centers on electronic measurement instruments for noise (dBAir octave band sound meters, SONIK and SONIK-E), hand-arm and whole-body vibration (Vexo H, VibA8), gas detection (GasAlertMicro 5/IR/PID), air sampling (Pocket Pump, Sidekick), audiometry, EMF and light, with each instrument calibrated and supported by an in-house laboratory. These instruments are tightly integrated with a proprietary software stack: TheCastleCloud for remote data management and reporting, dBdataPro (v3.5.1) for noise analysis, and VibdataPro (v5.0.2) for vibration analysis, with wireless calibrators (dBCal Triple Level) auto-pairing into the ecosystem.

The business operates as a diversified, multi-revenue-stream industrial safety platform. Castle monetizes through one-time instrument sales (Castle Shop e-commerce and international distributors), usage-based equipment rental (Castle Rent), professional calibration and repair services, training courses (3-day Competent Person training from £975 delivered at Scarborough and Peterborough), and consultancy services. Go-to-market combines product-led e-commerce, sales-led trade-in programs, and a channel partner motion recruiting international distributors, supported by content marketing (free seminars, webinars, eBooks) targeting UK health and safety, industrial, and construction professionals needing to comply with the Control of Noise at Work Regulations 2005, Control of Vibration at Work Regulations 2005, COSHH, and EMF at Work Regulations. The company holds BS EN ISO 9001:2015 certification, underwent management buyouts in 1980 and 2014, and grew through the 1995 acquisition of a noise/vibration consultancy and an audiometer medical company.

Name

The Castle Group,LTD

Legal name

Castle Group Ltd

Website

https://castlegroup.co.uk

Company type

Private

Founded year

1971

Operating status

Operating

Headcount range

11–50 employees

Short description

Castle Group Ltd is a UK-based manufacturer of occupational and environmental health and safety measurement instruments, including sound level meters, vibration meters, gas detectors, and air sampling equipment, serving industrial, construction, and health and safety compliance customers through direct sales, training, and calibration services.

Ownership category

akta.pro rank

Product category

Industrial Health & Safety Measurement Instruments

NAICS

Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (3345), Testing Laboratories and Services (54138), Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512)

SIC

Industrial Instruments For Measurement, Display, And Control (3823), Services-Testing Laboratories (8734)

akta.pro primary industry

Indoor Air Quality (IAQ) & Building Health Assessments (EUAHAGAG)

akta.pro secondary industry

Testing, Adjusting & Balancing (TAB) & Performance Verification (BPABACAJ)

Keywords

• Noise measurement instruments
• Vibration measurement equipment
• Occupational health safety
• Environmental monitoring technology
• Acoustic calibration services

Headquarters

HQ city

Scarborough

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Instrument Sales: Sale of proprietary measurement instruments including sound level meters, vibration meters, calibrators, gas detectors, air sampling equipment, and accessories through Castle Shop e-commerce platform and international distributors.
2. Equipment Rental: Rental services through Castle Rent for customers who prefer not to purchase equipment outright. Provides flexible access to measurement technology.
3. Calibration and Repair Services: Professional calibration and repair laboratory for technical measurement equipment including sound meters, vibration meters, gas detectors, air sampling equipment, audiometers, EMF meters, light meters, and temperature/hygrometer instruments.
4. Training Academy: World-class safety and environmental courses including Noise at Work Competent Persons Training (3-day course), Vibration Safety at Work, Environmental Noise, Air Sampling, EMF Regulations Safety. Training delivered on-site or at 4-star facility in Scarborough and Peterborough.
5. Consultancy Services: Safety, environment and industrial consultancy services for both simple and demanding issues. Includes HAVS tool testing service.

Pricing tiers

Go-to-market motion3 records

Distribution channels6 records

Marketing channels8 records

Core offering

The Castle Group designs, manufactures, and sells electronic measurement instruments for workplace and environmental noise, hand-arm and whole-body vibration, air sampling, gas detection, audiometric screening, and electromagnetic field exposure. It complements instrument sales with an integrated stack of cloud and PC software (TheCastleCloud, dBdataPro, VibdataPro), equipment rental (Castle Rent), a UKAS-style calibration laboratory (Castle Calibration), classroom training courses (Castle Training Academy), and bespoke safety, environment, and industrial consultancy (Castle Consultancy). The end-to-end offering is aimed at industrial, construction, and occupational health-and-safety customers needing to comply with UK HSE regulations.

Product overview

Castle Group Ltd is a UK-based manufacturer and supplier of environmental measurement and monitoring technology with over 50 years of experience. The company's product portfolio centers on noise, vibration, air sampling, gas detection, and occupational health measurement instruments. Core products include the dBAir octave band sound meter, SONIK-E environmental sound meter, SONIK sound level meters, Vexo H hand arm vibration meter, and VibA8 vibration meter. These instruments are supported by companion software including Castle Cloud (cloud-based data management), dBdataPro (noise analysis), and VibdataPro (vibration analysis). The company also offers calibration services, training courses, consultancy services, and equipment rental through its integrated business units. Products are available for purchase through the Castle Shop online store and via international distributors.

Differentiator

Problem solved

Functional benefit

Brands

• dBAir: Sound level meter product line including wireless-enabled models
• SONIK
• Vexo
• VibA8
• Sonus
• dBCal
• TheCastleCloud
• dBdataPro
• VibdataPro

Products and services

• Castle dBAir Octave Band Sound Meter Class 1 or Class 2 octave band sound level meter with data logging and secure cloud-based software, suitable for Noise at Work and Environmental Noise measurement.
• Castle SONIK-E Environmental Sound Meter Environmental sound meter with ultra low sound level detection and simultaneous LAeq, LCeq and PeakC measurements, compatible with PC and Castle Cloud software.
• Castle SONIK Sound Level Meters Easy-to-use sound level meters with 24+ hours battery life, available in Class 1 and Class 2 models, compatible with PC and Castle Cloud software.
• Castle Vexo H Hand Arm Vibration Meter UK's best-selling hand-arm vibration (HAV) meter, supplied with PC software, compliant with ISO 8041:2005, designed for quick and simple HAVS measurements.
• Castle dBCal Triple Level Acoustic Calibrator Acoustic calibrator with three output levels (94dB, 104dB, 114dB) at 1kHz, automatic wireless pairing with new Castle meters, fits standard 1/2" microphones, and works with Castle Cloud.
• Sonus Range Sound Level Meters and Dose Meters Logging and non-logging sound level meters and dose meters (Sonus, GA116L, GA116E, GA216L, GA116B, GA116I, GA216B, GA216I, GA257L) for workplace noise exposure and dose measurement, supported by dBdataPro analysis software.
• VibA8 Vibration Level Meter Vibration level meter for machinery and whole-body vibration measurement, supported by VibdataPro PC analysis software (v5.0.2, Windows 11 compatible).
• Castle Excalibur Audiometer Range Audiometers (including the GA1001 Excalibur, RA300, and RA500) for industrial hearing screening and workplace audiometric testing under hearing conservation programmes.
• Castle Pocket Pump Air Sampling Pump Personal air sampling pump for COSHH assessments, workplace exposure monitoring, and indoor air quality measurement.
• Castle Sidekick Constant Flow Pump Constant flow air sampling pump for industrial hygiene and air quality monitoring applications.
• Castle GasAlertMicro 5 Multi-Gas Detector Family Multi-gas detectors (GasAlertMicro 5, 5 IR, and 5 PID variants) for monitoring up to five gases simultaneously, including combustible gases, oxygen, carbon monoxide, hydrogen sulfide, and volatile organic compounds, for confined space and hazardous atmosphere work.
• Castle HAVi Vibration Exposure Monitor Hand-arm vibration exposure timer/monitor that counts vibration exposure, calculates exposure points, and warns operators as they approach EAV and ELV limits.
• Castle Personal Noise Activated Warning Devices Personal and area noise activated warning devices (GA902 noise warning sign, GA904 Electronic Orange, GA905 noise switch, GA907 dBAlert!) for hearing protection zone enforcement and personal hearing protection.
• Castle Cloud (TheCastleCloud) Cloud-based data management platform for Castle measurement instruments, with a powerful database, customized reporting, and remote data access for noise and vibration compliance programs.
• Castle dBdataPro Noise Analysis Software PC noise analysis software for Sonus and Vocis sound meters, current version 3.5.1, supports instrument data import, analysis, and Windows 11.
• Castle VibdataPro Vibration Analysis Software PC vibration analysis software for Vexo and VibA8 vibration meters, current version 5.0.2 with Windows 11 support.
• Castle Calibration Services Professional calibration and repair laboratory for sound level meters, vibration meters, gas detectors, air sampling equipment, audiometers, EMF meters, light meters, and temperature/hygrometer instruments, supporting both Castle and other manufacturers' equipment.
• Castle Training Academy World-class occupational safety and environmental training courses (Noise at Work Competent Person Training, Vibration Safety at Work, Environmental Noise, Air Sampling, EMF Regulations Safety) delivered at 4-star facilities in Scarborough and Peterborough or on-site, from £975 per 3-day course.
• Castle Consultancy Safety, environment, and industrial consultancy services for simple and complex occupational health and safety issues, including a HAVS tool testing service.
• Castle Rent Equipment Rental Equipment rental service hiring Castle measurement instruments at a fraction of purchase price for temporary measurement and project-based needs.

Quantifiable outcome

• Nearly 2 million people are at risk of HAVS in the UK, demonstrating the market need Castle addresses
• +1 more outcomes

Named customers3 records

Segments6 records

Ideal customer profiles6 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

One partnership is on record.

• International Distributors NetworkcoreChannel Partner/ Reseller/ DistributorCastle Group actively recruits international distribution partners to expand global reach. Distributors gain access to sell best-selling products in their country/area with large margins, special offers on demonstration equipment, optional back-to-back shipping without stock requirements, and dedicated support. No formal contract required.

Scale indicators5 records

Recent moves9 records

Expansion highlights5 records

Broad incumbents

• Brüel & Kjær (HBK): Global market leader in sound and vibration measurement instrumentation, part of Hottinger Brüel & Kjær (HBK). Operates across much broader scope than Castle but directly overlaps in sound level meters, vibration analyzers, and calibration services for industrial and environmental applications.
• Larson Davis (PCB Piezotronics): US-based manufacturer of sound level meters and noise monitoring equipment for occupational, environmental, and aerospace applications. Part of the larger PCB Piezotronics group with broader sensor portfolio but overlapping instrument offerings.
• TSI Incorporated: US-based manufacturer of precision measurement instruments including air sampling pumps, particle counters, and aerosol monitors. Overlaps with Castle's air sampling and COSHH-related product lines as part of a broader industrial hygiene portfolio.
• Honeywell (Gas Detection / PPE): Global industrial conglomerate offering gas detectors (e.g., BW Technologies, Honeywell Analytics) and hearing protection products used in occupational safety applications. Comparable product categories to Castle's gas detection and noise compliance offerings.
• 3M (Occupational Health & Safety Division): Global conglomerate whose Occupational Health & Safety division offers hearing protection, noise dosimetry, and detection equipment alongside a much broader product portfolio. Overlaps with Castle in workplace noise compliance and gas detection.

Direct peers

• SVANTEK: Poland-based specialist manufacturer of sound and vibration measurement instruments including Class 1 sound level meters and analyzers. Comparable niche product focus to Castle and even resold through Castle Shop.
• Norsonic: Norwegian manufacturer of precision sound level meters, noise analyzers, and building acoustics instrumentation. Comparable in instrument type and regulatory compliance focus (occupational and environmental noise).
• Cirrus Research: UK-based direct competitor specializing in sound level meters, noise dosemeters, and acoustic measurement instruments for occupational and environmental noise monitoring. Closely comparable product portfolio and regulatory focus (Noise at Work) to Castle Group.
• Casella (a TSI company): UK-based manufacturer of occupational health and hygiene instruments including sound level meters, vibration meters, dust monitors, and air sampling equipment. Direct competitor across Castle's measurement categories with similar regulatory focus.
• Rion Co., Ltd. Japanese manufacturer of sound level meters, vibration meters, and acoustic measurement instruments. Comparable product portfolio targeting occupational and environmental noise compliance markets.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/castlegroup71
• YouTubeyoutube.com/castlegroup71
• Facebookfacebook.com/castlegroupltd
• LinkedInlinkedin.com/company/952369

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries6 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 The Castle Group,LTD