What Stroma Ltd does

Stroma Ltd is a UK-headquartered compliance testing and environmental consultancy that provides accredited testing, inspection, and certification services to the built environment and infrastructure sectors. The company operates two divisions: Stroma Built Environment, which delivers UKAS-accredited air tightness testing, acoustic testing, SAP/SBEM/DSM energy calculations, BREEAM and overheating assessments, environmental sustainability consultancy, and digital surveying; and Stroma Specialist Access, which provides rope access inspections, structural drone surveys, scour assessments, and infrastructure vegetation removal for rail and highways clients including Network Rail, National Highways, and Amey. Underlying technology includes the in-house Compliance Pack documentation portal, the AutoBrel-integrated Part L evidence workflow, CAA-accredited drone operations, Smart HTC discrete-sensor heat loss measurement, and proprietary testing methodologies across 25 years of operation.

Stroma is a private limited company incorporated in England and Wales (Companies House No. 08960979), operating as a wholly-owned subsidiary within the Phenna Group Built Environment Division following its 2022 acquisition. Its business model is primarily project-based professional services: testing and inspection are quoted per project, while energy consultancy, certifications (EPCs, DECs, BREEAM), and compliance documentation are delivered under either project or multi-year licence arrangements. The company sells through dedicated direct sales teams split between the Wakefield Built Environment office and the Sheffield Specialist Access office, supported by content marketing via the Stroma Insights podcast, blog, and LinkedIn presence, capturing leads through web quote forms and inbound phone/email. Stroma serves a diversified customer base across architects, planners, housebuilders, retrofit owners, infrastructure operators, and tall-structure asset managers in the UK, Ireland, Europe, the Middle East, and Australia.

Funding rounds and audited revenue are not publicly disclosed. Leadership comprises Group CEO Martin Holt, Managing Director Steve Horrocks, HR Director Jonathan Gallie, QHSE Director Mark Rollins-Mann, and IT Director Calum Malcolm, with stated headcount of 51–100 employees and an operational footprint supported by offices in Wakefield and Sheffield.

Name

Stroma Ltd

Legal name

Stroma Group Ltd

Website

https://stroma.com

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

51–100 employees

Short description

Stroma Ltd provides accredited compliance testing, inspection, and environmental consultancy to architects, housebuilders, and infrastructure operators across the UK, Ireland, Europe, Middle East, and Australia, operating as the Built Environment Division of Phenna Group.

Ownership category

akta.pro rank

Product category

Building Compliance Testing Services

NAICS

Testing Laboratories and Services (54138), Testing Laboratories and Services (541380), Building Inspection Services (54135), Building Inspection Services (541350)

SIC

Services-Testing Laboratories (8734)

akta.pro primary industry

Building Compliance Testing & Certification (Backflow, RPZ, Cross-Connection) (BPABAHAK)

akta.pro secondary industry

Structural & Civil Inspection (Steel, Concrete, Foundations) (EUAEAHAI)

Keywords

• Building compliance testing
• Air tightness testing
• Acoustic testing services
• Energy performance assessment
• Specialist access inspections

Headquarters

HQ city

Castleford

HQ country

United Kingdom

HQ region

Europe

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. Testing and Inspection Services: One-time professional testing and inspection services including air tightness testing, acoustic testing, energy performance assessments, thermography, and specialist access inspections. Services are quoted per project or per assessment.
2. Energy Consultancy Services: Recurring and project-based consultancy including SAP calculations, SBEM/DSM, BREEAM assessments, overheating analysis, and carbon assessments for residential and commercial projects.
3. Certification and Compliance Services: Certification scheme services and building control compliance support including EPC lodgement, Display Energy Certificates, TM44 air conditioning inspections, and compliance documentation. Valid for multi-year periods (EPCs valid 10 years, TM44 valid 5 years).

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels7 records

Core offering

Stroma Ltd provides UKAS-accredited compliance testing, energy performance assessment, and environmental sustainability consultancy for the UK construction sector through its Built Environment division, and delivers specialist access inspection, maintenance, and examination services for rail, highways, and built structures via its Specialist Access division. Offerings include air tightness testing, acoustic testing, SAP/SBEM calculations, BREEAM assessments, drone surveys, rope access inspections, and infrastructure vegetation removal.

Product overview

Stroma Ltd operates as a compliance testing and environmental consultancy with two main divisions: Stroma Built Environment and Stroma Specialist Access. Stroma Built Environment provides a comprehensive suite of sustainability and regulatory compliance services including UKAS Accredited Air Tightness Testing, Acoustics Testing, Energy Performance Services (SAP Calculations, SBEM & DSM), Environmental Sustainability Services, and BREEAM Assessments. Stroma Specialist Access delivers inspection, maintenance, and examination services for UK infrastructure using rope access techniques, drone surveys, and difficult access methods. The company also offers digital tools including Compliance Pack (online compliance management platform) and newer services launched in 2022 including 3D Modelling, Topographical Land Surveys, Measured Building Surveys, and Drone Surveys. Together, these services support clients throughout the construction lifecycle from pre-construction planning through to post-construction compliance verification.

Differentiator

Problem solved

Functional benefit

Products and services

• Stroma Built Environment Expert sustainability and regulatory compliance services for the UK construction sector, providing air tightness testing, acoustic testing, energy performance assessments, and environmental sustainability consultancy for residential and commercial projects.
• Stroma Specialist Access Inspection, maintenance, and examination services for UK rail, highways, and built structures using rope access techniques, drone surveys, and difficult access methods.
• Air Tightness Testing UKAS Accredited Air Tightness Testing services including pre-test site inspections, final air testing, and certification for Part L compliance. Includes Plenum Testing, Part F Testing, Room Integrity Testing, and Smoke Shaft Vent Testing for construction sector clients.
• Acoustics Testing Acoustic testing services from initial design stages through to project completion for compliance against Approved Document E of the Building Regulations. Includes Noise, Dust & Vibration Monitoring and Sound Insulation Testing.
• Energy Performance Services Energy assessments and consultancy including SAP Calculations, SBEM & DSM calculations, Energy Statements, Carbon Assessments, Daylight & Sunlight Assessments, Life Cycle Analysis, and Overheating Analysis for residential and commercial projects.
• Environmental Sustainability Services Desktop Impact Assessments, CO2 emission reduction strategies, air quality maintenance, energy conservation compliance, and planning requirements support. Includes Air Quality Assessments, Indoor Air Quality, Thermography, Drone Surveys, and 3D Modelling.
• BREEAM Assessments Building Research Establishment Environmental Assessment Method assessments providing sustainability rating of buildings for residential and commercial developments.
• CDM Services Construction Design and Management services ensuring regulatory compliance for construction projects under CDM regulations.
• Rope Access Inspections Safe and efficient rope and difficult access techniques delivered by IRATA-certified technicians to inspect and examine structural assets across rail, highways, buildings, culverts, and masts.
• Scour Foundations Assessments Levels 1 and 2 Scour Assessments to inspect and maintain bridges over rivers that may be vulnerable to collapse due to flooding and other environmental factors.
• Structural Drone Surveys Drone technology inspections for structural assets in difficult-to-access areas where traditional asset and structural inspection methods are unfeasible or costly. Operated by CAA-accredited drone pilots.
• Infrastructure Vegetation Removal Safe, efficient vegetation removal works for rail, highways, and water infrastructure services. Includes site clearance, tree-felling, herbicide treatments, invasive species control, and rock slope descaling, supported by RISQS accreditation.
• Bridge Inspections Rope access and difficult access techniques for bridge inspection services using bolt climbing and other methods to access bridge structures for detailed examination.
• Environmental Survey Services Bundle of 3D Modelling, Topographical Land Surveys, Measured Building Surveys, and Drone Surveys producing digital building information models, accurate CAD outputs, and site survey data to support construction project decision-making.
• Compliance Pack Online compliance management platform enabling clients to manage regulatory compliance documentation online, including BREL reports and photographic evidence for house builders.

Quantifiable outcome

• 3.5 million+ air tightness tests completed over 25 years
• +3 more outcomes

Named customers4 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Four partnerships are on record, tiered core, strategic and minor.

• AutoBrelcoreTechnology or IntegrationStroma partnered with AutoBrel to provide a streamlined management solution that simplifies the collection of Part L photographic evidence for BREL (Building Regulations England Part L) reports. This digital workflow tool helps house builders manage compliance documentation more efficiently throughout construction.
• Future Homes HubstrategicStrategic or Co-development PartnerStroma joined the Future Homes Hub as a partner working on the climate and environment plan for new homes. The Hub brings together all participants in home building to achieve the sector's climate and environmental goals in line with the UK's net-zero targets. Stroma participates in topics including the Future Homes Standard, embodied and whole-life carbon, biodiversity net gain, and air quality.
• ACI ReportscoreOthersACI Reports is a sister company within the Phenna Group. Sarah Edwards from ACI Reports appeared as a guest on the Stroma Insights podcast to discuss TM44 air conditioning inspections, EPCs, and Display Energy Certificates. The companies collaborate on energy compliance services, with ACI Reports handling TM44, EPC, and DEC work.
• Silkstone EnvironmentalminorOthersSilkstone Environmental provides Measured Building Surveys and is referenced as a referral partner on the Stroma website, with their services accessible through the Stroma Pre & Post Construction service pages.

Scale indicators10 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Element Materials Testing: Element is a global testing laboratory network providing materials and product testing, including building envelope and construction-related testing, serving as a scaled incumbent comparator in the same lab-based testing category.
• Buro Happold: Buro Happold is an international engineering consultancy with significant UK building performance, sustainability, and MEP design work that intersects with Stroma's energy and sustainability consulting services.
• SGS UK: SGS is a global inspection, verification, and testing company offering UK building and infrastructure testing services that overlap with Stroma's compliance and inspection portfolio.
• Bureau Veritas UK: Bureau Veritas is a global TICC major with UK construction compliance, building inspection, and energy performance services that overlap with Stroma's Part L, BREEAM, and EPC offerings.
• Intertek UK: Intertek provides building products and construction materials testing, energy, and sustainability services across the UK, overlapping with Stroma's energy performance and acoustic testing work.

Direct peers

• TRC Companies: TRC is a US-headquartered environmental, inspection, and energy services firm providing building performance, energy compliance, and infrastructure inspection services comparable to Stroma's portfolio.
• RSK Group: RSK is a UK-focused environmental and geotechnical services group with energy, sustainability, and inspection services that compete with Stroma's environmental sustainability and air tightness testing practices.
• SOCOTEC UK: SOCOTEC UK is a leading testing, inspection, and compliance services provider with deep exposure to building control, air tightness, asbestos, and fire safety across UK construction and infrastructure — directly overlapping Stroma's Built Environment and Specialist Access offerings.
• Hydrock (now Stantec): Hydrock was a UK building performance, compliance, and engineering consultancy offering SAP, SBEM, BREEAM, and acoustic services directly competitive with Stroma Built Environment before its Stantec acquisition.
• Apex Companies: Apex Companies is an environmental and infrastructure services provider offering building compliance, energy, and inspection services that overlap with Stroma's built-environment testing practice.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/channel/UCjQjeG97cuTaHvjJAolgw
• Facebookfacebook.com/stromagroup
• LinkedInlinkedin.com/company/stromagroup
• Instagraminstagram.com/stromagroup
• Xx.com/stromagroup

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 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 Stroma Ltd