Principal Mechanical Engineer salary in United Kingdom

Average Yearly Salary of Principal Mechanical Engineer in United Kingdom is approximately 90,531 GBP (106,329 USD). Data is for 2025 and indicates a pre-tax value. The salary itself depends on multiple factors such as seniority, job performance, certifications, experience or any other bonuses. The value indicated is an average amount based on records we have in database. Real values may vary. The data is for orientational purposes.

What does Principal Mechanical Engineer do?

A principal mechanical engineer is a highly skilled professional responsible for leading and overseeing mechanical engineering projects. They play a crucial role in the design, development, and implementation of mechanical systems and components. Their main tasks include conducting research, analyzing data, and creating technical specifications. They collaborate closely with other engineers and professionals to ensure that projects meet quality standards and adhere to safety regulations. Additionally, they provide guidance and mentorship to junior engineers, review and approve project plans, and manage budgets and resources. This occupation requires strong analytical and problem-solving skills, as well as a deep understanding of mechanical engineering principles and practices.

Skills: Principal Mechanical Engineer, Mechanical Engineering, Project Management, Design and Development, Technical Specifications, Leadership
Job industry: Engineering

How much does Principal Mechanical Engineer make?

Difference in salary year over year or average salary increase is approximately 4 %


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Salary comparison to National average

Is Principal Mechanical Engineer a well paid job?

Yes, our data show that Principal Mechanical Engineer is a very well paid job. With years and experience the salary might increase even further, resulting in higher satisfaction.

What is considered a high salary for Principal Mechanical Engineer?

High salary for Principal Mechanical Engineer would be somewhere between 99,584 GBP and 131,270 GBP. However this is an estimation based on Gaussian Distribution.

How much can you save working as Principal Mechanical Engineer in United Kingdom?

Living in United Kingdom the approximate monthly expenses are: 1,956 USD. This amount covers basic needs such as food, housing, clothing, healthcare and education costs for a single person. No luxury expenses such as traveling, leisure, hobbies are included in the estimation.

Estimated Yearly Salary: 90,531 GBP
Estimated Monthly Salary: 7,544 GBP
Estimated Weekly Salary: 1,741 GBP per week
Estimated Hourly Salary: 44 GBP per hour
By working as Principal Mechanical Engineer a person can save up to 6,905 USD per month or 82,862 USD yearly. Values are pre-tax.

NOTE: These values are estimates and are averaged for the whole country. Furthermore the value is likely exaggerated as no other expenses are taken into account in the projection. Unessential expenses are very subjective and are difficult to assess. Most likely the previously estimated number is significantly lower for majority of people. Expenses in different cities across the country may vary. Above values accuracy is low and is based on limited set of data obtained.

For more information regarding expenses in United Kingdom, see costs of living in United Kingdom.

Salary comparison to region and neighbouring coutries

Country's neighbours are: Ireland.
To make it easier for comparison a conversion from local currency to USD has been made (conversion rates may vary).

Estimated Yearly Salary for Principal Mechanical Engineer

Last revision of data: 2025-01-04

Salary increase per years of experience

Based on data available the salary increase per years of experience is as following

0 years (beginner) equals base salary

1 to 5 years of experience yields +12% salary increase

6 to 10 years of experience yields +25% salary increase

11 to 15 years of experience yields +16% salary increase

16 to 25 years of experience yields +9% salary increase

more than 25 years of experience yields +10% salary increase

NOTE: Details based on limited set of data. Percentages may vary. The salary increase over years of experience can vary widely based on factors such as job industry, job role, location, company size, and individual performance. To gain even larger increase in salary one is advised to switch jobs and / or employer.

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Data as of 2025

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