Senior Mechanical Building Services Design Engineer
Location: London
Employment Type: Full-Time, Permanent
Salary: -60,000 - -65,000 per annum

Role Overview
Our client is seeking an experienced and highly motivated Senior Mechanical Building Services Design Engineer to take a lead role within their growing Design & Build team. The role will suit a mechanically biased Building Services Design Engineer with strong technical capability, commercial awareness, and experience delivering mechanical design solutions within a Design & Build environment.

You will lead the mechanical design process from feasibility and concept through to detailed design, installation, and commissioning support. The role will involve close collaboration with estimating, project management, construction teams, clients, consultants, and supply chain partners to ensure designs are compliant, coordinated, buildable, and aligned with project requirements.

This is a London-based role and will initially be office-based, with flexibility for hybrid working after the first few months.

Key Responsibilities

• Lead the mechanical design of building services systems including HVAC, public health, and coordination with specialist system suppliers.
• Manage the full design lifecycle from feasibility and concept through detailed design, installation, and commissioning support.
• Collaborate closely with internal teams, including estimating, project management, and construction, to develop coordinated and buildable solutions.
• Engage with clients, consultants, and supply chain partners to ensure project objectives are met.
• Prepare and review detailed design calculations, drawings, and technical submissions.
• Ensure compliance with relevant regulations, standards, and sustainability targets.
• Value engineer designs to achieve cost efficiency without compromising quality or performance.
• Support procurement activities, including equipment selection.
• Attend meetings and provide technical support during construction and commissioning phases.

Requirements

• Degree qualified in Mechanical Engineering or Building Services Engineering, or equivalent.
• Chartered Engineer status, or working towards, is highly desirable.
• Extensive experience in mechanical building services design within a Design & Build environment.
• Strong knowledge of HVAC systems, heat load calculations, ventilation design, and public health services.
• Proficiency in industry-standard software, such as AutoCAD, Revit, IES, Hevacomp, or similar.
• Demonstrated experience delivering projects across sectors such as commercial, residential, healthcare, or industrial.
• Strong understanding of UK Building Regulations, CIBSE guidelines, and relevant standards.
• Excellent communication and project coordination skills.
• Commercial awareness with the ability to balance cost, quality, and programme requirements.
• Experience with BIM Level 2 or higher and digital engineering practices is desirable.
• Knowledge of sustainable design principles and low-carbon technologies, such as heat pumps and renewables, is desirable.
• Experience working directly with contractors or within a Design & Build organisation is desirable.

What''s on Offer

• Salary of -60,000 - -65,000 per annum.
• Senior-level mechanical design role within a growing Design & Build team.
• Opportunity to lead mechanical design across a diverse range of construction projects.
• Involvement from feasibility and concept through to detailed design, installation, and commissioning support.

Apply
This role would suit an experienced Mechanical Building Services Design Engineer who is confident leading technical design, working collaboratively with multidisciplinary teams, and delivering compliant, cost-effective mechanical solutions within a Design & Build environment.

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