Summary
Overview
Work History
Education
Skills
Languages
Timeline
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Leon Pazagiannis

Leon Pazagiannis

Summary

A results-driven Senior MEP Project Manager with extensive experience leading multi-million-pound projects. Skilled in delivering high-performance building services solutions, ensuring compliance with industry standards, and optimizing energy-efficient systems. Proven ability to manage complex MEP installations while maintaining cost efficiency and exceeding client
expectations.

Overview

11
11
years of professional experience

Work History

Mechanical Lead

Mercury Engineering
06.2025 - Current
  • HEL10 : 48MW Data Center for Microsoft
  • Spearheading mechanical systems leadership in the design, construction, and commissioning of a 48 MW hyperscale data center, ensuring optimal performance, scalability, and compliance with Microsoft standards.
  • Overseeing the integration and coordination of Off-Site Manufactured (OSM) packages of water treatment, fire sprinkler pump house and guard houses, aligning early-stage prefabrication workflows with on-site delivery schedules to streamline construction timelines.
  • Directing end-to-end implementation of Building Automation Systems (BAS), enabling efficient monitoring and control of HVAC, energy usage, and environmental systems across the facility.
  • Managing the development and installation of critical security infrastructure—including access control, CCTV, and perimeter protection—ensuring robust compliance with global data center security protocols.
  • Delivering effective leadership on fire safety systems: supervised installation of fire alarm, fire sprinkler systems, and ensured full coordination with local regulatory requirements and safety codes.
  • Leading multidisciplinary coordination across stakeholders including design teams, contractors, and vendors to ensure alignment of mechanical scope with electrical, civil, and IT infrastructure.
  • Developing and maintaining project documentation, risk assessments, and commissioning reports for all mechanical assets, supporting transparency and operational continuity.
  • Acting as a key liaison between Microsoft’s global infrastructure team and local execution partners, ensuring standards of quality, sustainability, and innovation were met throughout project lifecycle.

Senior MEP Project Manager

MACE
07.2024 - 06.2025
  • LON01&02 : 98MW Data Center for Microsoft
  • Led the delivery of a £200M mechanical systems package for Microsoft’s hyperscale Data Center in North Acton, managing the full lifecycle from design through commissioning combined in both Unified Entities ( LON01 and LON02).
  • Oversaw the design, procurement, and installation of complex mechanical infrastructure, including HVAC systems, cooling towers, Primary Chilled Water (PCW), Variable Refrigerant Flow (VRF), public health mechanical works, and advanced fire suppression systems.
  • Spearheaded electrical systems design reviews and coordinating interdisciplinary input to ensure compliance with Microsoft’s global standards and seamless integration with mechanical services.
  • Managed Building Automation System (BAS) architecture and deployment, facilitating smart building capabilities across MEP systems.
  • Led Combined mechanical and electrical resolution of Requests for Information (RFIs), design workshops, Drawing Release and Technical Submittal Reviews whilst driving clarity and alignment between design intent and field execution during the RIBA stages in interface with the CSA packages.
  • Sequenced critical infrastructure works to support commissioning (CX) milestones, ensuring readiness for system tagging, testing, and final handover.
  • Coordinated across Stage 4 design consultants, subcontractors, and client representatives to maintain schedule, mitigate risks, and align deliverables with operational targets.
  • Utilized Microsoft’s digital project monitoring platforms to enhance real-time visibility, performance tracking, and commissioning acceleration.

MEP Project Manager

Ardmore
06.2023 - 07.2024
  • 8 Eaton Lane : A Heritage Building, transformed into a 42 Luxurious Apartments in Victoria,London.
  • Directed the Mechanical, Electrical, and Public Health (MEP) design from RIBA Stage 3 (Developed Design) through Stage 5 (Construction) for 8 Eaton Lane—a landmark heritage refurbishment project in central London.
  • Led technical coordination across architectural, structural, and conservation disciplines to preserve heritage elements while integrating modern building services.
  • Ensured full compliance with regulatory and sustainability standards, including BREEAM certification, BS 9991:2021 fire safety guidelines, and Loss Prevention Council (LPC) specifications.
  • Conducted in-depth energy strategy reviews and presented value-engineering proposals to optimize mechanical and electrical plant configurations while reducing capital and operational expenditure.
  • Fostered strategic relationships with the supply chain, securing innovative and cost-effective design and procurement solutions tailored to project constraints.
  • Chaired design review meetings and workshops with consultants and contractors, providing direction on interface management, system integration, and clash resolution.
  • Monitored site execution against programme targets, risk registers, and technical submittal schedules, proactively adjusting plans to maintain delivery milestones and client objectives.
  • Supported commissioning planning and MEP handover documentation, ensuring readiness for occupancy and long-term operational efficiency.

Building Services Manager

John Sisk and Son
01.2022 - 07.2023
  • NE03, St John's Hill Phase 2,E02& E03, 0% Net Carbon European Campaign by John Sisk
  • Directed the £19.5M MEP package for NE03, a multi-phase student accommodation project, driving design coordination, procurement strategy, and construction sequencing in alignment with tight university intake schedules and phased handover requirements.
  • Directed full lifecycle delivery of District Heating Network (DHN) infrastructure across the North East Lands development in Wembley for Sisk, ensuring hydraulic balancing, metering integration, and system interoperability across multiple mixed-use plots.
  • Spearheaded smart energy metering deployments and implemented carbon-neutral technologies—including low-carbon plantrooms, demand-side management platforms, and BMS-driven analytics—contributing to the UK South division’s decarbonization roadmap.
  • Structured commissioning sequences for critical building systems including HVAC, domestic water services, electrical distribution, and life safety systems. Oversaw witness testing, cause-and-effect validation, and streamlined documentation for handover.
  • Delivered St John’s Hill Phase 2, comprising four high-rise assisted living residential towers, integrating advanced MEP design to meet accessibility, compliance, and long-term care standards.
  • Coordinated fire strategy execution across blocks, including dry risers, refuge areas, and smoke ventilation.
    Integrated renewables-readiness, CHP, and energy recovery systems into plant layouts while maintaining operational simplicity for care staff.
  • Managed defect resolution, seasonal commissioning cycles, and client aftercare packages post-handover to ensure smooth transition to occupancy and long-term maintainability.


MEP Site Manager

Berkeley Homes
01.2018 - 01.2022
  • SQP1 & SQP4, 67and 57 floors skyscrapers of 1115 combined luxury apartments.
  • Directed site-based delivery of the £120M MEP package for South Quay Plaza 1, a 68-storey high-rise residential tower with integrated retail and amenities, overseeing all mechanical and electrical installations from shell to final fit-out.
  • Supervised MEP subcontractors across phases including site mobilization, first fix, containment installation, service riser fit-out, and final system commissioning for HVAC, power distribution, lighting, life safety, and public health systems.
  • Oversaw the successful deployment of a central Combined Heat and Power (CHP) plant, reducing CO₂ emissions and improving energy efficiency for over 60,000m² of built environment, in compliance with SAP and Part L regulations.
  • Coordinated vertical service risers across all floors, managing progressive lifts of mechanical systems including LTHW, CHW, boosted cold water, and extract ductwork—ensuring clash-free installation with architectural and structural interfaces.
  • Ensured precise sequencing of electrical systems, including LV switchgear installation, metering setups, apartment distribution boards, fire alarm routing, and structured cabling for smart home readiness.
  • Led technical site inspections, snagging walkdowns, and commissioning readiness reviews, resolving non-compliance issues and ensuring installation met specification and client quality standards.
  • Managed commissioning activities for all MEP systems, facilitating cause-and-effect verification, performance testing, water treatment, and BMS integration for HVAC and energy monitoring platforms.
  • Delivered full documentation sets—including Operation & Maintenance manuals, as-built records, and asset tagging—and hosted structured client handover meetings ensuring seamless transition to occupancy.
  • Acted as key liaison between site teams, design consultants, and client representatives, resolving design queries, change orders, and managing interface challenges while maintaining programme integrity.
  • Championed health, safety, and sustainability practices across MEP works, achieving zero lost-time incidents and contributing to Berkeley’s reputation for high-specification residential delivery.

Mechanical Construction Manager

SKANSKA
02.2014 - 01.2018
  • Elizabeth Line : A new Underground Line under Transport for London
  • Led on-site coordination of mechanical installation works for the Elizabeth Line at Paddington Station, one of the most complex phases of Crossrail’s development, delivering engineering activities in line with programme and quality benchmarks.
  • Managed daily briefings and task allocations for multidisciplinary site teams, including subcontractors, ensuring clear technical instruction and safety compliance across all project zones.
  • Administered QA/QC protocols in accordance with Network Rail standards, including inspection test plans (ITPs), red-line markups, snag resolution, and formal sign-off procedures.
  • Delivered toolbox talks and safety inductions tailored to high-risk activities, actively promoting a safety-first culture and achieving zero major incidents during critical operations.
  • Oversaw works across challenging environments including confined spaces, sump trenches within the live rail zone, HV substations, and security-sensitive areas—ensuring strict adherence to RAMS (Risk Assessment Method Statements), permit-to-work systems, and HAZCON procedures.
  • Facilitated interface coordination between mechanical, electrical, civil, and fire safety teams to ensure sequenced execution of works in line with access limitations and programme constraints.


Education

Master of Science - Building Services Engineering

Heriot Watt University
Edinburg ( Online)
01-2025

NVQ Level 7 in Senior Construction Management

City of Westminster College
London
01-2020

Bachelor of Science - Electronic Engineering

Piraeus Technical Institute
Athens, Greece
01-2013

Skills

  • Project Planning & Execution
  • Risk Mitigation & Compliance
  • Construction Documentation and Planning Instrumentation
  • MEP Design Development & Installation
  • Building Safety & Regulations
  • Contract Negotiation & Tender Management
  • Digital Construction & New methods of prefabrication
  • Supply Chain Development
  • Preconstruction Management
  • Handover Experience

Languages

English
Bilingual or Proficient (C2)
Greek
Bilingual or Proficient (C2)
Albanian
Bilingual or Proficient (C2)
Italian
Beginner (A1)

Timeline

Mechanical Lead

Mercury Engineering
06.2025 - Current

Senior MEP Project Manager

MACE
07.2024 - 06.2025

MEP Project Manager

Ardmore
06.2023 - 07.2024

Building Services Manager

John Sisk and Son
01.2022 - 07.2023

MEP Site Manager

Berkeley Homes
01.2018 - 01.2022

Mechanical Construction Manager

SKANSKA
02.2014 - 01.2018

Master of Science - Building Services Engineering

Heriot Watt University

NVQ Level 7 in Senior Construction Management

City of Westminster College

Bachelor of Science - Electronic Engineering

Piraeus Technical Institute

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Leon Pazagiannis