Pettit Singleton Associates

What Pettit Singleton Associates does

Pettit Singleton Associates (PSA) is a privately held UK building services and mechanical & electrical (M&E) engineering consultancy founded in 1989 and headquartered in Preston, with a regional office in Carlisle. The firm delivers in-house M&E design, feasibility studies, Authorising Engineer services (notably HTM compliance for NHS clients), project management, Clerk of Works, and sustainability and decarbonisation consultancy, using CAD and Revit BIM for design coordination. PSA serves NHS Trusts, universities, local authorities, housing associations, charities, and commercial clients across the North West of England and Cumbria, with 20+ year repeat relationships with several anchor clients.

PSA operates a B2B professional services model, earning project-based consultancy fees determined through tendering and procurement frameworks, with multi-year contracts typical on public sector work. Its go-to-market relies on direct enterprise engagement, industry reputation, repeat business, and credentials including ISO 9001, ISO 14001, Cyber Essentials Plus, CIBSE Low Carbon Consultant, and BREEAM Excellent-rated project deliveries. The firm is founder-led (Steve Singleton), reports 0% staff turnover, and has delivered year-on-year growth over the past decade while remaining small (11–50 employees) and organically funded.

Name

Pettit Singleton Associates

Legal name

PSA Ltd.

Website

https://psaltd.co.uk

Company type

Private

Founded year

1989

Operating status

Operating

Headcount range

11–50 employees

Short description

Pettit Singleton Associates is a UK building services and M&E engineering consultancy founded in 1989, delivering mechanical and electrical design, Authorising Engineer, sustainability, and project management services to NHS Trusts, universities, local authorities, and developers across the North West of England and Cumbria.

Ownership category

akta.pro rank

Headquarters

HQ city

Preston

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Professional Services - M&E Consultancy: Fee-based professional services for mechanical and electrical engineering design, consultancy, and project management. Revenue generated through consultancy fees on project engagements with public and private sector clients.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Pettit Singleton Associates provides mechanical and electrical (M&E) building services engineering design and consultancy, energy and sustainability advisory, Authorising Engineer services, feasibility studies, project management, and Clerk of Works services for construction projects. The firm delivers end-to-end support for healthcare, education, public sector, residential, and heritage clients across the North West of England and Cumbria. All capabilities are delivered in-house by qualified engineers.

Product overview

Pettit Singleton Associates (PSA) is a sustainable engineering consultancy for the construction industry offering a comprehensive suite of building services. The portfolio centres on core M&E (Mechanical & Electrical) consultancy services including Mechanical Engineering Design, Electrical Engineering Design, Building Services Feasibility, Compliance & Regulation, Authorising Engineer services, Lead Consultant, Project Management and Clerk of Works. These are complemented by specialist Sustainability & Energy services covering Decarbonisation & Net Zero planning, Renewable Energy Design, and Energy Performance Certificates & Surveys. The offering is structured as a unified consultancy service where all capabilities are delivered in-house, enabling the firm to provide end-to-end support from initial feasibility through to project completion and compliance verification.

Differentiator

Problem solved

Functional benefit

Products and services

• Building Services Feasibility Provides early engineering insight into the mechanical and electrical infrastructure of a building, helping project teams understand opportunities, constraints and potential costs before progressing into detailed design. Targeted at construction project teams and estates managers evaluating capital projects.
• Mechanical Engineering Design Design and consultancy for mechanical systems throughout projects, covering heating, ventilation, air conditioning and plumbing, delivering optimised designs, cost savings and regulatory compliance. Delivered either as part of an M&E contract or for specialist mechanical requirements, for construction clients across sectors.
• Electrical Engineering Design Design and consultancy for electrical systems including planning, conceptualising implementation, analysing electrical needs, designing system layouts and ensuring compliance with standards. Uses advanced software tools to model, simulate, and optimise system performance for efficiency, safety, reliability, and sustainability.
• Compliance and Regulation Auditing of existing building services M&E and life safety systems, identifying non-compliances and providing tailored solutions to bring systems up to standard, with focus on healthcare, residential and commercial sectors.
• Authorising Engineer Technical oversight for M&E systems ensuring designs, plans and implementations meet industry standards and legal requirements, providing specialist technical advice and guidance. Particularly used in healthcare environments under HTM standards as Authorising Engineers for NHS Trusts.
• Lead Consultant

Named customers20 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

Feature4 records

Partnerships

25 partnerships are on record, tiered core and minor.

• Cumbria Chamber of CommercecoreOthersPSA joined Cumbria Chamber of Commerce as a Partner Member, providing opportunity to connect with local business community, share expertise, and engage with Chamber members working on building projects or considering retrofit work.
• FWP GroupminorImplementation/ SI/ Consulting PartnerArchitectural firm collaborated with PSA on Cumberland Sports Village project (£10.6m) for combined Workington football and rugby facility.
• DAY ArchitecturalminorImplementation/ SI/ Consulting PartnerArchitectural practice collaborated on multiple Manchester Metropolitan University projects and Broadgreen Hospital refurbishment.
• Thomas Armstrong GroupminorImplementation/ SI/ Consulting PartnerConstruction firm collaborated on Phoenix Enterprise Centre heritage refurbishment and Orchard Cottage renovation projects.
• Caddick ConstructionminorImplementation/ SI/ Consulting PartnerMain contractor for Jubilee Gardens extra care residential (£20m) in Leyland.
• Atkinsons BuildersminorImplementation/ SI/ Consulting PartnerContractor partnered on Harbour Place extra care residential project in Workington.
• Morgan Sindall ConstructionminorImplementation/ SI/ Consulting PartnerMain contractor for Workington Innovation Centre (£12m) new build office development.
• PK EngineeringminorImplementation/ SI/ Consulting PartnerM&E contractor collaborated on Workington Innovation Centre project.
• Greenmount ProjectsminorImplementation/ SI/ Consulting PartnerContractor on Manchester Metropolitan University Careers Studio project.
• Cassidy & AshtonminorImplementation/ SI/ Consulting PartnerArchitectural practice collaborated on MMU International College refurbishment.
• Gilling Dod ArchitectsminorImplementation/ SI/ Consulting PartnerArchitects for Cheshire & Wirral Partnership NHS Trust mental health facility refurbishment.
• Red Tree Building ContractorsminorImplementation/ SI/ Consulting PartnerContractor for Manchester Metropolitan University Digital Education Nexus.
• Carefoot plcminorImplementation/ SI/ Consulting PartnerContractor for Wrightington, Wigan & Leigh Teaching Hospitals endoscopy unit (£6.4m).
• Story ContractingminorImplementation/ SI/ Consulting PartnerDesign and build contractor for Lakes College civil engineering training facility.
• JJ GroupminorImplementation/ SI/ Consulting PartnerPartnered on Lakes College civil engineering training facility project.
• MercersminorImplementation/ SI/ Consulting PartnerMechanical subcontractor on Manchester Metropolitan University Digital Education Nexus project.
• T ClarkeminorImplementation/ SI/ Consulting PartnerM&E contractor for Network Rail National Records Office project.
• Cumbria MechanicalminorImplementation/ SI/ Consulting PartnerMechanical contractor on Harbour Place extra care residential project.
• Walsh M&E ElectricalminorImplementation/ SI/ Consulting PartnerElectrical contractor for XYZ Building office fit-out project.
• CurtinsminorImplementation/ SI/ Consulting PartnerEngineering consultancy collaborated on Manchester Metropolitan University Careers Studio project.
• ICON ProjectsminorImplementation/ SI/ Consulting PartnerProject management on MMU International College refurbishment.
• JFW ConstructionminorImplementation/ SI/ Consulting PartnerContractor for Cheshire & Wirral Partnership NHS Trust mental health facility refurbishment.
• GR BradshawminorImplementation/ SI/ Consulting PartnerContractor on mental health facility project.
• Day Cummins ArchitectsminorImplementation/ SI/ Consulting PartnerArchitectural practice for Phoenix Enterprise Centre heritage conversion project.
• Places For PeopleminorImplementation/ SI/ Consulting PartnerProgramme Initiation Manager referenced working with PSA on capital replacement projects.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Pick Everard: Mid-sized UK building services and structural engineering consultancy serving NHS, education, residential and heritage clients. Closest direct peer in scale, sector mix and delivery model to PSA.
• EDP Consulting Engineers: Specialist UK M&E and sustainability consultancy focused on healthcare, education and commercial sectors. Closest niche-comparable peer with similar scale and HTM-style healthcare expertise.

Broad incumbents

• Cundall: Multidisciplinary engineering consultancy with a strong building services (MEP) practice across UK, Europe, Asia and Australia. Competes with PSA in healthcare, education and sustainability-led commercial projects.
• Hoare Lea: UK-headquartered MEP building services engineering consultancy. Operates at significantly larger scale but competes with PSA for healthcare, education and public sector M&E commissions; provides the closest like-for-like capability benchmark.
• Hydrock (now part of Stantec): UK-built environment consultancy offering MEP, sustainability and decarbonisation services prior to Stantec acquisition. Overlaps with PSA in healthcare estates, education and net-zero advisory work.
• Ridge and Partners: UK property and construction consultancy offering M&E, structural and project management services. Larger than PSA but competes for healthcare, education and developer-led schemes.

Emerging players

• Exectrend: UK healthcare Authorising Engineer and estates compliance specialist. Direct overlap with PSA's HTM AE offering for NHS Trusts.

Regional players

• Buttress Architects: North West England-based architectural practice with heritage and conservation focus. Comparable regional North West footprint and overlap with PSA on heritage retrofit projects such as Phoenix Enterprise Centre.
• Watson Batty Architects: Yorkshire/North of England architecture and building consultancy with M&E capability. Similar regional UK profile and public-sector client base as PSA.
• Northern Trust (Building Services): North West-based building services consultancy serving similar NHS, council and developer clients. Direct geographic peer for PSA's Preston/Carlisle heartland.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/pettit-singleton-associates
• Facebookfacebook.com/Marketing-Means-154423544624531

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 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 Pettit Singleton Associates