Senior Mechanical Design Engineer

Equans UK & Ireland; United Kingdom; On-site; GBP 50,000 - 70,000; Full time

Job summary

Equans UK & Ireland is seeking a Senior Mechanical Design Engineer to lead high-quality mechanical design projects focused on decarbonisation and energy solutions. This role involves managing design teams, ensuring project compliance with regulations, and delivering innovative HVAC and energy systems for public and private clients in the UK. The position offers a competitive salary and comprehensive benefits, making it an ideal opportunity for experienced engineers committed to sustainability and innovation.

Benefits

25 days annual leave (+ public holidays)

Life Cover equivalent to 2 times annual salary

Employee discount shopping schemes

Gym membership discounts

Cycle to work scheme

Holiday purchase scheme

Corporate social responsibility days

Learning opportunities and professional qualifications

Qualifications

• Minimum of 6 to 10 years’ experience in mechanical building services design.
• Experience in low-carbon technologies and sustainable retrofit projects is essential.
• Chartered Engineer status preferred.

Responsibilities

• Lead the design of HVAC systems and low-carbon energy solutions.
• Manage end-to-end project delivery ensuring compliance with industry standards.
• Support the development and mentoring of junior engineers.

Skills

Design Management

Project Delivery

Risk Assessment

Energy Efficiency

Decarbonisation

Education

Degree in Mechanical Engineering

Retrofit Designer Certification

Tools

IES

Energy Pro

BIM

CAD

Job description

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Equans is looking for a Senior Mechanical Design Engineer (Decarbonisation & Energy Solutions) to join our team in London or Manchester. This is a full-time role. On offer is a competitive salary, and benefits package.

The Senior Mechanical Design Engineer is responsible for the delivery of high-quality mechanical designs and technical support across decarbonisation and sustainable retrofit projects. This includes the design and optimisation of HVAC systems, heat pumps, and building automation systems, supporting the full project lifecycle from early feasibility through to construction and commissioning.

This position requires technical leadership, design management, and mentoring responsibilities within a multidisciplinary environment. The role supports public and private sector clients in achieving their decarbonisation and net-zero ambitions.

Working closely with the Lead Mechanical Design Engineer, this role ensures compliance with industry regulations, fosters innovation, and supports the development of junior engineers within the team.

What will you deliver?

Mechanical Design & Engineering

• Develop mechanical designs across RIBA Stages 2 to 4, with ongoing technical support to the project team through Stages 5 to 6.
• Design and integrate low-carbon energy solutions, including heat pumps, district heating, HVAC, BMS and other energy-efficiency measures typical of sustainable retrofit into new and existing buildings.
• Support energy modelling and system performance simulations using IES, Energy Pro, and other tools.
• Ensure compliance with relevant standards (CIBSE, PAS 2035, MCS, UK Building Regs) and guidelines.
• Participate in the implementation and coordination of BIM and CAD-based design processes.
  
  

Design Management & Team Development

• Undertake design and design coordination and management, integrating mechanical, electrical, and energy systems for seamless project execution.
• Participate in technical reviews in support of the tendering-, commercial and project delivery.
• Facilitate collaborative design workshops to enhance interdisciplinary coordination and innovation.
• Ensure best practices in design management, aligning with sustainability, compliance, and operational efficiency.
• Liaise with the design and project teams to ensure smooth progression into delivery.
• Produce and develop technical reports, drawings, and specifications.
  
  

Project and Risk Support

• Manage designs and support end-to-end project lifecycle delivery, helping to ensure projects are delivered on time and within budget.
• Conduct design reviews, ensuring design solutions meet performance, safety, and regulatory standards
• Assist in identifying design risks and contribute to risk mitigation strategies and manage the design risk registers.
• Provide input into procurement and supplier selection processes.
• Support planning submissions and due diligence processes for retrofit interventions.
  
  

Technical Leadership & Retrofit Strategy

• Effectively communicate technical concepts clearly to internal and external stakeholders.
• Support internal teams and external clients in decarbonisation projects such as ReFit, PSDS, Warmer Homes, GHNF, and HNES.
• Manage the development of decarbonisation project planning for public and private sector clients, including local authorities, social housing associations, healthcare, and commercial organisations.
• Conduct technical and financial feasibility assessments for low-carbon technologies such as heat pumps, district energy systems, HVAC, BMS, and solar PV, ensuring their viability and suitability.
• Oversee the retrofit design process, ensuring mechanical interventions align with decarbonisation goals and funding criteria, from feasibility to completed design.
• Coordinate with energy, electrical, and project delivery teams to ensure holistic system design.
• Collaborate in design workshops and knowledge-sharing sessions to foster continuous improvement and innovation.
  
  

What can we offer you?

On offer is a competitive salary, and benefit package, which includes;

• 25 days annual leave (+ public holidays)
• Life Cover equivalent to 2 times annual salary
• Employee discount shopping schemes on major brands and retailers
• Gym membership discounts
• Cycle to work scheme
• Holiday purchase scheme
• 2 corporate social responsibility days per year
• Broad range of learning opportunities, such as professional qualifications, collective/individual training, and personalized support programmes
• Attractive Employee Referral Rewards Scheme
• Access to our growing employee networks
• 24/7 Employee Assistance Program and access to mental wellbeing app
  
  

Who are you?

Qualifications or Required Experience:

Experience:

• Experience in design and design management, risk assessment, and project delivery of sustainable retrofit, low-carbon technologies, and energy efficiency projects.
• Proficiency in design-, energy modelling- and simulation software such as IES, Energy Pro, PVsol, Termis, NEMO, and Netsim.
• Experience working across full RIBA stages on multidisciplinary teams.
• Experience in public sector or funding-driven decarbonisation projects such as PSDS and WH/ SHDF.
• Minimum of 6 to 10 years’ experience in mechanical building services design.
  
  

Qualifications:

• Degree in Mechanical Engineering or Building Services Engineering (BEng or equivalent).
• Chartered Engineer status (CEng) with CIBSE or IMechE preferred.
• Retrofit Designer Certification is highly desirable, but not essential.
  
  

Who are we?

In the UK & Ireland, Equans is a provider of sustainable facilities management and regeneration, and cutting-edge energy and digital services. Our 15,000 employees combine these activities to deliver decarbonisation across the built environment and help businesses, communities, public sector organisations and government to accelerate the transition to a low carbon, resilient world.

Globally, Equans is a world leader in the energy and services sector with operations in 20 countries, 90,000 employees working on 5 continents and a turnover of 19.2 billion euros in 2024. Equans is a subsidiary of the Bouygues group.

Our ambition

At Equans, we are driven by our ambition to be recognised for our operational excellence and as the best place to work for our employees. This commitment extends to achieving global and sustainable performance through Impact, ensuring that everything we do aligns with our core values—Accountability, Respect, Team Spirit, and Service Focus.

We take ownership, act with integrity, and set high standards. We listen, support, and care for one another. We collaborate and build trust to achieve shared goals, always striving to meet our customers' needs in a proactive and pragmatic way. These values shape our culture, strengthen our community, and inspire us to deliver excellence every day.

What's next?

If this role is of interest to you, please click below to register, apply, and track your progress! A member of our Resourcing Team will review your application and be in touch.

As part our commitment to better reflect the markets within which we operate, we encourage applications from women, ethnically diverse individuals and people with disabilities, along with all candidates who identify with protected characteristic groups under the Equality Act 2010.

At Equans we’re committed to delivering a culture where everyone’s voice is heard and supported. We know the value a diverse workforce creates, delivering better results for our people, customers, and stakeholders. Diversity and inclusion is at the core of what we do, should you join Equans you’ll find a welcoming and open workplace where you’re supported and encouraged to be your true self at work.

You’ll also have access to our growing employee networks including AccessAbility (representing those with physical and mental disabilities), Encompass (representing the LGBTQ+ community), RISE (representing people from ethnic backgrounds), Veterans & Reservists, WOMEN Together (representing women in Equans), Working Parents, and Young Professionals.

For this role, you must have evidence of the right to work in the UK. Unfortunately, we are not able to offer a re-location package with this job role. Certain roles may require applicants to undergo a Disclosure check, as noted in the role requirements.

The Equans Resourcing Team manage this requirement. Agency involvement is not required. All related enquiries should come to the resourcing team not direct to Equans Managers.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

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