Senior to Principal Mechanical Design Engineer | Oxford | Low Carbon Projects, Heritage Refurbishments, Progression Opportunity A well-established, independent building services consultancy in Oxford is looking to strengthen their mechanical team with an experienced Senior or Principal Mechanical Engineer. Known for delivering technically robust, sustainable solutions across heritage, education, healthcare, and infrastructure projects, this team combines mechanical, electrical, lighting, Passivhaus, and building physics expertise under one roof. With a strong pipeline of work and ongoing investment in their people, this is a great opportunity to step into a high-impact role with long-term progression potential. 🛠️ Role Overview: Lead or support mechanical design from RIBA Stage 2 through to handover, including detailed HVAC, hot and cold-water systems, and sustainable design strategies Collaborate with clients, architects, and internal teams to develop low-energy, technically sound solutions across new-builds and complex refurbishments Apply building performance analysis and building physics principles where relevant, working closely with in-house specialists Oversee or contribute to technical documentation, drawings (AutoCAD, Revit), and specifications Attend site visits, manage design coordination, and provide support throughout the construction phase Mentor junior engineers and take an active role in internal knowl...