Simpson Associates

What Simpson Associates does

Simpson Associates (trading as Simpson TWS) is a UK structural and civil engineering consultancy established in 1969 and headquartered in Henley-on-Thames, with additional offices in Gloucester and London. The firm delivers a portfolio of integrated engineering services covering structural design and analysis, civil and infrastructure engineering, temporary works design (with particular strength in complex central London basement construction inherited from the 2019 TWS merger), sustainability, conservation/listed-building work, hydrology, transport planning, and site appraisals.

The consultancy is structured as a Limited Liability Partnership (Simpson Associates Consulting Engineers LLP, Company Number OC351954) and operates a project-based professional services model. Revenue is generated through fees charged for engineering consultancy engagements on commercial, residential, hospitality, education, manufacturing, and public-sector projects. Clients are acquired through industry relationships, repeat engagements, referrals, professional networks, and tender processes; pricing is project-specific and not publicly disclosed. The firm works with named enterprise clients including Barratt London, Whitbread/Premier Inn, Galliard, Legal & General Investment Management, Taylor Wimpey, Renishaw, Kier, and Bewley Homes.

The firm has scaled through a measured combination of organic growth and acquisitions, completing the merger with Taylor Whalley and Spyra in September 2019 (combining 120 years of expertise) and acquiring Graphic Structures in November 2024, which lifted headcount to over 100 across three offices. Certifications include ISO14001 (environmental management, 2023) and Cyber Essentials. The current equity-partner group includes Gareth Crowther, Ian Rollinson, Chris Martin, Mike Beckly, Mark Cradduck, and Jamie Munro. Notable disclosed projects include the £460m A417 Missing Link for National Highways, the 627-apartment Lower Essex Street Birmingham scheme for Galliard, 456 new homes at New Malden for Barratt, the Forum Gloucester (Kings Quarter, 600,000 sq ft), and Hub by Premier Inn Marylebone (294 bedrooms, 14 storeys).

Name

Simpson Associates

Legal name

Simpson Associates Consulting Engineers LLP

Website

https://simpsoneng.com

Company type

Private

Founded year

1969

Operating status

Operating

Headcount range

51–100 employees

Short description

Simpson Associates (trading as Simpson TWS) is a UK-based structural and civil engineering consultancy founded in 1969, serving commercial, public-sector, and residential clients with design, temporary works, and infrastructure services from offices in Henley-on-Thames, Gloucester, and London.

Ownership category

akta.pro rank

Product category

Structural Engineering Services

NAICS

Engineering Services (54133), Architectural, Engineering, and Related Services (5413)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

Systems Engineering & Technical Program Management (BPAHAIAI)

Keywords

• Structural engineering services
• Civil engineering consultancy
• Temporary works design
• Infrastructure engineering
• Transport planning services

Headquarters

HQ city

Henley On Thames

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. Engineering Consultancy Services: Professional engineering consulting services charged on a project basis. Revenue generated through fees for structural engineering, civil engineering, and related consultancy services for commercial, residential, and public sector projects.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Simpson Associates (trading as Simpson TWS) is a structural and civil engineering consultancy delivering practical, commercial engineering solutions for commercial, public sector and domestic clients. The firm provides structural design, structural analysis, forensic structural investigation, temporary works design, civil and infrastructure engineering, hydrology, transport planning, sustainability, site appraisals, and conservation engineering services from offices in London, Henley-on-Thames, and Gloucester with a UK-wide service offering.

Product overview

Simpson Associates (trading as Simpson TWS) is a structural and civil engineering consultancy that provides a unified portfolio of engineering services rather than a software product platform. The company offers eight core service disciplines: Structural Engineering, Civil & Infrastructure, Temporary Works, Sustainability, Site Appraisals, Hydrology, Conservation, and Transport Planning. These services are delivered as an integrated consultancy offering, with particular expertise in complex temporary works, central London basement construction, and heritage building alterations. The company serves commercial, public sector and domestic clients across the UK.

Differentiator

Problem solved

Functional benefit

Products and services

• Structural Engineering Comprehensive structural design, analysis, forensic structural investigation and temporary works design services for commercial, public sector and domestic clients.
• Civil & Infrastructure Civil engineering expertise including infrastructure, environment, hydrology and transport planning services that combine to maximise the development potential of sites for clients.
• Temporary Works Temporary works design services including complex temporary works and central London basement construction projects.
• Sustainability Sustainable engineering services with focus on environmental management and sustainable development practices, backed by ISO14001 certification.
• Site Appraisals

Quantifiable outcome

• Embodied carbon reduced by 7,000 tonnes through alternative RC slab design for sustainable warehousing project
• +1 more outcomes

Named customers14 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Five partnerships are on record, tiered core and minor.

• JW Filshill Ltd.coreStrategic or Co-development Partner · 18 November 2025Leading Scottish wholesaler partnered with Simpson Associates (AI consultancy) to implement AI-powered data transformation. The collaboration aims to improve retail operations and support growth for KeyStore convenience store partners through data-driven strategies and digital transformation across the network.
• Graphic StructurescoreStrategic or Co-development Partner · 12 November 2024London-based civil and structural engineering consultancy acquired by Simpson TWS in November 2024. The acquisition continued steady growth, bringing staff numbers to over 100. Graphic Structures built reputation for award-winning design-lead engineering solutions particularly in affordable housing and public-sector projects.
• Taylor Whalley and Spyra (TWS)coreStrategic or Co-development Partner · 3 September 2019Simpson Associates acquired Taylor Whalley and Spyra in 2019, combining 120 years of engineering expertise. The merger consolidated presence in London and provided robust succession strategy. TWS brought particular experience in complex temporary works and central London basement construction.
• Constructing Excellence GloucestershireminorOthersIndustry body collaboration for site visits, networking events, and professional development including Constructing Excellence Gloucestershire Club breakfast events and annual showcases.
• Clive Graham Associates, Spatial Dimensions, Playle & Partners, Watkins PayneminorOthersCollaborating consultants for Connect 5 Networking Breakfast initiative bringing together industry professionals across property and construction sectors.

Scale indicators11 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Walsh Associates: Mid-size UK structural and civil engineering consultancy serving developers, architects and public clients — directly comparable scale and service mix to Simpson TWS.
• Price & Myers: London-based structural engineering consultancy with a similar partner-led, project-focused model and strong heritage/cultural portfolio overlap with Simpson TWS.
• Heyne Tillett Steel: London structural and civil engineering practice competing directly in commercial, residential and conservation work; comparable in size, culture and central-London specialism.
• Pell Frischmann: UK-headquartered multi-disciplinary engineering consultancy covering structures, civils, highways and infrastructure. Closely comparable mid-size UK competitor for both public and private sector structural/civil mandates.
• Curtins: UK structural and civil engineering consultancy with multiple regional offices and a heritage comparable to Simpson TWS. Directly competes for residential, commercial and education sector structural work.
• Watkins Payne: UK structural and civil engineering consultancy referenced in the same Connect 5 professional network group as Simpson TWS; comparable size and service offering for residential and commercial work.

Broad incumbents

• Arup: Global engineering consultancy with deep UK presence covering structural, civil, infrastructure and temporary works. Overlaps directly with Simpson TWS on large UK building and infrastructure projects but at materially greater scale and breadth.
• Mott MacDonald: International engineering, management and development consultancy with strong UK structural/civil practice. Competes with Simpson TWS on UK infrastructure and built-environment mandates, particularly on National Highways-style schemes.
• WSP: Global professional services consultancy with significant UK structural and civil engineering teams. Competes on similar project types — transport, residential, commercial and public sector infrastructure.
• AECOM: Global infrastructure consulting firm with substantial UK structural/civil engineering capability. Comparable on building and infrastructure engineering consultancy work for developers and public clients.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/simpson-associates_2
• Instagraminstagram.com/simpsoneng1/?hl=en
• Xx.com/simpsonassocia3

Revenue estimate

Valuation estimate

Number of profiles

Profiles13 records

Subsidiaries2 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 Simpson Associates