Principal Mechanical Engineer Building Services Thomas Search are partnered with a leading, forward-thinking Mutli - disciplinary consultancy to appoint a Principal Mechanical Design Engineer into their expanding South-East Building Consultancy teamThis is an opportunity for a Principal Mechanical Building Services Engineer who wants to operate at the technical and professional core of project delivery. You''ll be joining an established MEP design team delivering work across a wide and balanced project portfolio, spanning residential, regeneration, healthcare, education, and commercial sectors. The role is design-led, client-facing, and suited to an engineer who is confident taking responsibility for outcomes, as well as a desire to lead projects, mentor junior members and ambition to succeed. Working within a multi-disciplinary environment, you''ll lead mechanical design packages, manage your own workload, and contribute to the successful delivery of projects from early concept through detailed design and construction support. The role will involve: Leading mechanical services design on building projectsActing as lead engineer within design teamsManaging and coordinating internal disciplines on smaller schemesProducing detailed designs, calculations, reports, drawings, and specificationsUsing industry-standard tools such as Hevacomp, IES, CAD, and RevitUndertaking QA reviews to ensure technical and regulatory complianceAdvising clients on energy efficiency, sustainability,