Choosing the right electrical engineering partner can have a direct effect on safety, cost, energy use, construction quality and long-term system performance. From commercial buildings and industrial facilities to transport, utilities and renewable energy projects, a well-designed electrical system helps a project operate safely and reliably from day one.

Electrical design services cover much more than producing drawings. They can include load calculations, power distribution design, lighting, earthing, protection, cable sizing, energy systems, equipment specifications, system studies and construction documentation. The right provider will also understand how electrical systems interact with mechanical, structural, architectural and control disciplines.

The UK market includes large multidisciplinary engineering consultancies, specialist design firms and smaller engineering practices. This guide highlights 10 providers with established electrical engineering and design capabilities across different sectors. The list is intended as a practical market overview rather than a universal ranking, because the right provider depends on project size, technical scope, location and budget.

What Are Electrical Design Services?

Electrical design services involve planning and documenting the electrical systems required for a building, facility, infrastructure project or industrial installation. Engineers turn the project requirements into practical systems that can be installed, tested, maintained and operated.

Typical electrical design work may include:

• Electrical load assessments

• LV and MV distribution design

• Single-line diagrams

• Cable sizing and voltage-drop calculations

• Lighting design

• Emergency lighting

• Small power systems

• Earthing and bonding

• Lightning protection

• Generator and UPS systems

• Solar PV and battery storage integration

• EV charging infrastructure

• Protection and coordination studies

• Electrical equipment schedules

• Tender documentation

• Construction drawings

• Testing and commissioning support

Good design also considers future requirements. For example, a commercial building may need enough electrical capacity for additional EV chargers, heat pumps, data equipment or renewable energy systems.

How We Selected These Electrical Design Providers

There is no single measure that can identify the right electrical engineering company for every UK project. Instead, this list considers factors such as the breadth of documented electrical capabilities, UK presence, sectors served, project complexity and the range of design stages supported.

Some providers focus strongly on major infrastructure and energy projects. Others have substantial building services expertise, while smaller consultancies can offer more focused support for commercial and industrial clients.

The companies below are therefore presented as notable providers to consider rather than as a definitive performance ranking.

Top 10 Providers of Electrical Design Services in the UK

1. Arup

Arup is a major engineering and design consultancy with a long-established UK presence. Its electrical engineering practice works across buildings, transport infrastructure, energy, water and waste utilities.

Arup states that its electrical services include energy audits, demand assessment, supply and system resilience, utilities consultancy and sustainable electrical engineering design. Its building services teams also integrate electrical engineering with mechanical and public health disciplines. 

This makes Arup relevant to large and technically complex projects where electrical systems need to be coordinated with several other engineering disciplines.

Suitable for: Major buildings, infrastructure, transport, energy and complex multidisciplinary projects.

2. WSP

WSP provides electrical engineering across buildings, infrastructure, energy and transport projects. Its UK services include mechanical, electrical and plumbing engineering, lighting and energy solutions, power generation, transmission and distribution.

WSP's published capabilities include electrical engineering design, EV infrastructure consultancy, power facility design, network planning and detailed design. Its MEP practice works across sectors including commercial offices, healthcare, aviation, data centres and residential assets. 

The company is therefore suited to projects where electrical design forms part of a wider multidisciplinary engineering package.

Suitable for: Buildings, infrastructure, power networks, transport, healthcare and energy projects.

3. AtkinsRéalis

AtkinsRéalis offers electrical engineering services across the energy, water, rail and built environment sectors. Its published engineering and design capabilities cover electrical distribution systems, design, tendering, procurement and surveying. 

Its UK building design teams also work on LV and MV power systems, earthing, renewable technologies, PV and battery energy storage systems, including grid connections. The company references industry software such as Trimble ProDesign and ETAP within its electrical design work. 

This broad sector coverage can make the company relevant to technically demanding infrastructure and building projects.

Suitable for: Rail, water, energy, buildings, infrastructure and critical facilities.

4. Mott MacDonald

Mott MacDonald has electrical engineering capabilities across energy, water, buildings and infrastructure.

Its UK electrical engineering work includes LV installations, distribution systems, motor control centres, switchboards, cabling, instrumentation, industrial networks, PLCs and SCADA. Its energy teams also work on renewable generation, network design, grid connections and transmission and distribution projects. 

Mott MacDonald Bentley combines Mott MacDonald's design expertise with JN Bentley's contracting experience, supporting projects from feasibility and design through construction and commissioning. 

Suitable for: Water, wastewater, energy, infrastructure, industrial and building projects.

5. AECOM

AECOM operates across infrastructure, buildings, transport, water and other major project sectors. Its UK business brings together planners, designers, engineers, scientists, project managers and other technical specialists across the project lifecycle. 

AECOM's building engineering work includes mechanical and electrical engineering. Its project work also demonstrates electrical engineering involvement in complex facilities, such as the King's College London Quadrangle Building, where its engineering team provided mechanical and electrical engineering services for research laboratories and teaching spaces. 

Suitable for: Large commercial buildings, infrastructure, transport, education and complex development projects.

6. Jacobs

Jacobs provides integrated design and engineering services across multiple industries. Its approach covers work from concept and feasibility through detailed design, with multidisciplinary teams supporting project delivery. 

Jacobs has also supported major UK electricity infrastructure programmes. For example, its National Grid design and project services framework included feasibility, surveys, conceptual and detailed design, assurance, verification and commissioning across areas such as substations, overhead lines, cables, HVDC and protection and control. 

Suitable for: Energy infrastructure, utilities, transport, water and complex multidisciplinary programmes.

7. Arcadis

Arcadis provides integrated design and engineering services across buildings, transport, power utilities, water utilities, railways and other asset types.

Its electrical design and engineering capabilities form part of a wider multidisciplinary service. Arcadis also describes mechanical and electrical engineering work involving buildings, transportation networks, energy infrastructure and complex assets. 

Its approach can be useful where electrical engineering needs to be integrated with structural, mechanical, civil, transport or digital design.

Suitable for: Buildings, rail, infrastructure, utilities, energy and large development programmes.

8. Ramboll

Ramboll has electrical engineering capabilities covering buildings, energy, industry and transport. Its UK engineering practice works across the project lifecycle, from early studies and design conditions through to handover.

Ramboll's electrical capabilities include high and low voltage systems, emergency power, generators, batteries, earthing, lightning protection, fire detection, security systems and IT and communications networks. Its power systems services also cover grid connections, substations, electrical layouts, load flow, earthing and system studies. 

Suitable for: Data centres, hospitals, commercial buildings, energy infrastructure and complex power systems.

9. Stantec

Stantec provides engineering and design services in the UK, including electrical engineering, buildings engineering, detailed engineering and design, energy audits and feasibility studies. 

Its UK services also include mechanical and electrical engineering, digital design and engineering, sustainability and building performance. 

This combination can be useful for projects where electrical systems must be considered alongside building performance, sustainability and wider engineering requirements.

Suitable for: Buildings, infrastructure, energy, water and multidisciplinary engineering projects.

10. Almens Consult

Almens Consult provides electrical engineering consulting focused on practical technical solutions, project design and planning, process optimisation and compliance assurance. Its electrical engineering offering supports projects of different sizes and includes design-related engineering expertise. 

Almens Consult also covers electrical control and design work, including power system design, load analysis, PLC programming, SCADA development, protection coordination studies and energy management system design. 

For businesses seeking a more focused engineering consultancy, this type of service can be useful where the project requires direct technical input rather than a large multidisciplinary consultancy structure.

Suitable for: Commercial and industrial electrical projects, controls, power systems, energy management and compliance-focused work.

Comparison of Electrical Design Providers

What Should Electrical Design Services Include?

A complete electrical design package should match the project's size and technical requirements. A basic commercial refurbishment may need lighting, small power, distribution and compliance documentation. A large industrial facility may need detailed power studies, protection coordination, motor control, automation and high-voltage systems.

Electrical Load Calculations

Engineers assess connected loads and expected demand before selecting equipment and distribution systems. Correct calculations help avoid undersized systems while preventing unnecessary overcapacity.

Power Distribution Design

This covers how electrical power moves from the incoming supply through transformers, switchgear, distribution boards and final circuits. Single-line diagrams help engineers and contractors understand the proposed arrangement.

Lighting Design

Lighting design considers illumination levels, energy consumption, controls, emergency lighting and the purpose of each space. Modern projects may also integrate daylight control and automated lighting systems.

Earthing and Protection

Earthing, bonding and protective devices form an important part of electrical safety. The design should consider fault conditions and ensure that protective equipment operates as intended.

Renewable Energy Integration

Solar PV, battery storage and other low-carbon technologies create new design requirements. Engineers may need to consider generation profiles, protection, grid connections, energy storage and system control.

EV Charging Infrastructure

EV charging can add significant electrical demand. A good design assesses available capacity, charging requirements, load management and future expansion before equipment is installed.

Why Professional Electrical Design Matters

Electrical design decisions affect both construction and operation. A weak design can lead to costly changes during installation, poor system performance, difficult maintenance and avoidable energy use.

Professional electrical design services help identify these issues before construction begins. Engineers can assess system capacity, coordinate equipment, produce accurate drawings and specifications, and identify clashes with other disciplines.

Good design also supports compliance. UK projects may need to consider applicable regulations, standards, client specifications and distribution network requirements. The exact requirements depend on the type of installation and project.

How to Choose the Right Electrical Design Company

Start by defining the project scope. A company that is experienced in large infrastructure projects may not be the most practical choice for a smaller commercial installation, while a specialist consultant may not have the resources needed for a major national programme.

Consider these factors:

Technical Experience

Look for experience with the electrical systems actually required for the project. Ask whether the provider has worked with LV, MV or HV systems, industrial controls, renewable energy, data centres, healthcare or other relevant environments.

Design Deliverables

Confirm what you will receive. Depending on the project, this may include calculations, specifications, single-line diagrams, layouts, equipment schedules, cable schedules and construction documentation.

Compliance Knowledge

The consultant should understand the relevant UK requirements and project-specific standards. This is particularly important for safety-critical and regulated environments.

Coordination

Electrical design rarely exists in isolation. The provider should be able to coordinate electrical systems with architecture, mechanical services, structures, fire systems, ICT and other disciplines.

Project Communication

Clear communication reduces design changes and delays. Ask who will lead the project, how design reviews will be handled and how revisions will be controlled.

Whole-Life Considerations

The cheapest initial design is not always the lowest-cost solution over the life of a building or facility. Energy use, maintenance, reliability, replacement requirements and future expansion should also be considered.

Common Mistakes When Selecting Electrical Design Services

One common mistake is choosing a provider based only on price. A lower design fee may not represent lower total project cost if the design creates construction changes or operational problems.

Another issue is failing to define the scope. Electrical design can cover anything from basic layouts to complex power system studies. Without a clear scope, it becomes difficult to compare quotations.

Businesses should also avoid treating drawings as the only deliverable. Calculations, specifications, schedules and design assumptions can be equally important because they explain why equipment and systems have been selected.

Finally, consider future demand. Buildings and industrial sites are becoming more dependent on electricity, particularly as EV charging, heat pumps, battery storage and renewable generation become more common.

How Almens Consult Can Help With Electrical Design

Almens Consult supports businesses with electrical engineering solutions covering project design and planning, technical engineering, controls and compliance. Its services can include power system design, load analysis, protection coordination, PLC and SCADA solutions, and energy management system design. 

The team can help businesses assess electrical requirements, develop practical design solutions and address technical or compliance challenges across commercial and industrial projects. This approach can be useful for organisations that need focused engineering support from initial planning through to implementation.

Conclusion

The UK has a broad market for electrical design services, ranging from global engineering consultancies to specialist engineering companies. Arup, WSP, AtkinsRéalis, Mott MacDonald, AECOM, Jacobs, Arcadis, Ramboll, Stantec and Almens Consult all offer documented electrical engineering capabilities, although their sectors, project scales and delivery models differ.

The right choice depends on your project requirements rather than the size of the provider alone. Before appointing an engineering consultant, review its technical experience, design deliverables, compliance knowledge, multidisciplinary coordination, communication process and understanding of whole-life costs.

A clear scope at the start will also make it easier to compare proposals and select an electrical engineering partner that can deliver safe, practical and maintainable systems.