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Mott MacDonald • London, UK

Associate Mechanical Building Services Engineer

2 days/week at home

A little flex time – We’re happy to talk flexible working and how we can support your responsibilities beyond the workplace. We offer a range of options depending on your role, so please discuss this with your recruiter.

Apply now

Job Description

Mott MacDonald

We’re a global engineering, management, and development consultancy.
Our purpose is to improve society by considering social outcomes in everything we do, relentlessly focusing on excellence and digital innovation, transforming our clients’ businesses, our communities and employee opportunities.

A fundamental part of this is respecting each person’s differences and striving to meet their needs.

We are proud to be a one of Glassdoor’s top employers to work for in the UK, as well as being recognised as a Top Inclusive Company in the UK.

Our values: Progress, Respect, Integrity, Drive, Excellence.

About the business unit
The Buildings and Cities Unit (BNC) has a major presence in Mott MacDonald's regional offices throughout the UK and mainland Europe, providing a wide range of diverse and transferable cross-sector skills across five key Sectors; Advisory, Built Environment, Energy, Transportation and Water. We also provide local services to customers and technical leadership to the rest of the Group in these sectors.

Overview of role
Do you want to work for a company whose purpose is to improve society by considering social outcomes, and to transform businesses, communities, and opportunities for its employees?

We are seeking an Associate Mechanical Building Services Engineer to support and develop the project delivery, technical capability, and profitability of our Building Services team in London in support of a wider team in Brighton, Croydon, London and Cambridge. The buildings services team comprises 110 staff within the multidisciplinary buildings team of 550 staff in London and the Southeast Division.

The Building Services team enjoys successful client relationships in Stations; Airports; Residential, Defence; Healthcare; Local Authority; Education; and Higher Education. We are keen to grow our expertise and size of team.

Our projects are regional, national and global with opportunities for travel in support of such.

We are seeking a candidate who will help build client relationships through excellent project delivery and communication skills and help in generate more work from clients.

The candidate will be self-motivated and capable of delivering high quality designs to time and budget with minimum supervision. As part of the wider practice network the team has developed reputation for work winning, successful project delivery and technical excellence.

We are looking to support a candidate with long-term career goals in both design and management.

The successful candidate will typically be responsible for;
• All aspects of assigned project design work.
• Driving technical excellence in sustainability and safety in our designs.
• Support graduate/early career professionals, act as technical mentor.
• Working and liaising with other disciplines whilst delivering projects.
• Management of internal and external stakeholders.
• Support to senior managers running the commercial and contractual side of projects.
• A range of small to large projects within our building services team
• Working autonomously within a team carrying out building services projects.
• Potentially managing several projects and the work of others
• Able to act as the main Client facing / technical lead for Mott MacDonald on selected projects

We are actively recruiting a diverse workforce that is reflective of the communities we serve. We recognise that differences in ability, skills and experience are a strength and encourage applications from people of all backgrounds.

Candidate specification
The candidates will:
• Be CEng and a member of the IMechE or CIBSE.
• Be based in our London office for a minimum of three days a week.
• Travel to projects and offices across the London and the Southeast as required with occasional national and global travel.
• Have a track record in building services mechanical engineering design and specification using relevant industry software (NBS Create, IES, TAS and REVIT etc).
• Have excellent communication skills, including report writing and presentations.
• Have an ability to work collaboratively, both internally and with external partners and sub-contractors.
• Being responsible for the design and delivery of a wide range of projects.
• Up to date knowledge of current building regulations, legislation and standards applicable in building and infrastructure design.
• Self-motivated, with the ability to work on own initiative and the confidence to make decisions.
• Have a track record in writing specifications including General Requirements/Preamble, Scope of Works, BMS and Automatic Controls / Description of Operation Specifications
• Have a track record of change control management and pricing of Client instructions / variations
• Good working knowledge of thermal comfort, psychometrics and HVAC processes
• Good working knowledge of large / district LTHW and CHW cooling networks including sizing, space planning, system hydraulics and controls
• Good working knowledge of large ventilation system design and design of terminal comfort cooling and air conditioning units (fan coils units, displacement ventilation, chilled beams etc)
• Good working knowledge of BSRIA BG 6 and some familiarity of construction procurement routes and contracts (JCT, NEC etc)
• Working knowledge of fire safety systems including smoking extract systems, wet and dry riser systems, sprinklers, gaseous fire suppression systems

We would like the candidate to, or aspiring, to:
• Manage engineering teams comprising building services engineers, structural engineers and civil engineers.
• Commercial / financial management of projects
• Train graduates/Early Career Professionals (ECP).
• Bid for work or able to provide support to those leading bids.
• Maximise profitability of projects, monitoring against budget, reacting and anticipating potential problems and communicating in line with client expectations.
• Lead Mechanical elements of one large project or a portfolio of smaller projects.


Equality, diversity, and inclusion

We put equality, diversity, and inclusion at the heart of our business, seeking to promote fair employment procedures and practices to ensure equal opportunities for all. We encourage individual expression in our workplace and are committed to creating an inclusive environment where everyone feels they can contribute.


We want you to perform your best at every stage in the recruitment process. If you are disabled or need any support to enable you to apply or attend an interview, please contact us at reasonable.adjustments@mottmac.com and we will talk to you about how we can support you.

Agile working

Happy to talk Flexible Working and how we can support your responsibilities beyond the workplace.

We offer some fantastic benefits including:

Health and wellbeing

  • Private medical insurance for all UK colleagues.
  • Health cash plan to support you with every day health costs and treatments.
  • Access to Peppy, providing free support from menopause experts for all UK colleagues.
  • A variety of wellbeing support is available through our comprehensive wellbeing program, including access for you and your family.
  • Ability to flex your salary to opt into a wide range of health benefits, many of which can be extended to your family too.

Financial wellbeing

  • We match employee pension contributions between 4.5% and 7%.
  • Life assurance equal up to 4 x your basic salary, with an option to increase the level of cover to 6 x your salary.
  • Our income protection scheme provides a financial benefit, as well as absence and return to work support due to long-term illness or injury.
  • Flexible benefits, including increased life assurance cover, critical illness insurance, payroll saving and will writing.
  • As an independently owned business we share the financial success of the business with all our colleagues in various ways including annual bonus schemes.


  • A minimum of 33-35 days holiday each year, inclusive of public holidays and dependent on level, with the ability to buy or sell leave through our flexible benefits programme.
  • Holiday entitlement increased to a minimum of 35 days after 5 years’ service.
  • Variety of employee saving schemes and discounts from high-street retailers.

Enhanced family and carers leave

  • Enhanced family leave policies, including 26 weeks paid maternity and adoption leave, and two weeks paid paternity/partner leave.
  • Our shared parental leave matches maternity leave meaning we pay up to 24 weeks at full pay.
  • Up to five additional days leave are provided for those with significant caring responsibilities, two of which are paid.

Learning and development

  • Primary annual professional institution subscription.
  • A broad range of opportunities to enhance both technical and soft skills through mentoring, formal training, and self-development options.

Networks, communities, and social outcomes

  • Join a wide range of groups including our Advanced Employee Networks which support our LGBTQ+, gender, race and ethnicity, disability, and parents/carers communities.
  • Make a difference within our communities through our social outcomes.

Apply now, or for more information about our application process, click here.

Company benefits

Open to part-time employees
Adoption leave – 26 weeks full pay
Open to part time work for some roles
Buddy scheme
Flexible working week
Enhanced sick pay
Dental coverage
Compassionate leave
Health assessment
Eye Care Support – Eyecare vouchers
Private GP service – Private Medical care for all UK staff
Season ticket loan
Theme park discounts
Religious celebration leave
Buy or sell annual leave
Accrued annual leave
Caregiver Leave
Enhanced maternity leave – 26 weeks
Enhanced paternity leave – 2 weeks
Shared parental leave – We match up to 24 weeks full pay
Pregnancy loss leave
Tax-free childcare
In office yoga classes
Cycle to work scheme
Faith rooms
Salary sacrifice
Life assurance
Annual pay rises
Pension match/increase
Life insurance
Annual bonus
Income protection
Employee discounts
Professional subscriptions – We pay for your primary professional annual subscription
Lunch and learns
Employee assistance programme
L&D budget
Teambuilding days
More information needed
More information needed
More information needed
Work-life balance
More information needed
Role modelling
More information needed
More information needed

Working at Mott MacDonald

Company employees

18,000 worldwide

Gender diversity (male:female)


Office locations

UK Wide; London, Croydon, Birmingham, Derby, Altrincham, Manchester, Whitehaven, Newcastle, Middlesbrough, Durham, Bristol, Southampton, Reading, Cambridge, Peterborough, Brighton, Norwich, Glasgow, Edinburgh, Aberdeen, Inverness, Cardiff, Newport, Exeter, Leicester, Leeds, Skipton, York

Hiring Countries

United Kingdom