Chartered Engineering · Construction · Property

Delivering Complex
Infrastructure with
Precision & Integrity

20+ years of safety-critical delivery across rail depots, stations, MEP systems and residential schemes — as client, contractor and framework partner.

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£420M+ Major Depot Projects
20+ Years Experience
3 Chartered Bodies

About SPAG

Engineering Excellence.
Trusted Delivery.

SPAG Construction Ltd is led by Stuart Powell, dual Chartered Building Engineer and Construction Manager (CB Eng, FCABE, MCIOB), with over two decades of experience delivering complex, safety-critical infrastructure in live operational environments.

We specialise in full-lifecycle design, construction, testing, commissioning and handover of rail depots, stations, MEP / M&E systems and specialist equipment — working as client-side, main contractor or framework delivery partner.

Alongside major infrastructure, SPAG also provides residential procurement, leasing, renovation (DASH Accredited) and RTM management services.

CB Eng FCABE MCIOB MCMI

Stuart Powell

Director · Chartered Building Engineer

  • Designated Engineer & CRE on multi-million pound rail schemes
  • NEC Supervisor / CEM / DPE experience across Network Rail & TfL
  • HAZID / HAZOP, CSM-RA and CDM Principal Contractor leadership
  • Specialist in live operational environments with zero disruption focus
Full career journey →

What We Offer

Core Services

Engineering & Quality Assurance

Full technical assurance, design review, HAZID/HAZOP, RAM studies, testing & commissioning, and independent verification for safety-critical systems.

Construction & Project Management

End-to-end delivery of complex schemes — NEC contract administration, logistics in live environments, multi-disciplinary coordination and client handover.

Residential Procurement & Renovation

DASH Accredited residential acquisition, leasing, renovation and asset management. Focused on quality, compliance and long-term value.

RTM Management

Right to Manage company formation, governance and ongoing management services for residential leaseholders seeking control of their buildings.

Training & Mentoring

Practical training and mentoring in construction management, NEC contracts, CDM duties and technical assurance for engineers and site teams.

MEP / Specialist Systems

Mechanical, electrical, LV, fire/life safety, drainage, utilities and specialist depot plant & equipment — from design through to operational handover.

Selected Work

Featured Projects

High-value, complex schemes delivered in live operational environments with minimal disruption.

Modern London Underground train depot – Cockfosters & Northfields
TfL · 2024–2026

Cockfosters & Northfields Depots

Transport for London

Lead Project Engineer (Specialist Depot Systems & MEP). Designated Engineer for DP&E, technical interfaces with Siemens, fleet and operations, HAZID/HAZOP leadership, and full LV packages in live depot environments.

Designated Engineer Live Operations
Modern UK railway station with trains
Network Rail · 2019–2024

NW&C Region Works Delivery

MACE / Network Rail

Designated Project Engineer / Contractor Engineering Manager for MEP, buildings and stations. Full engineering lifecycle from inception to handover across depots, stations and sidings in live rail operations.

DPE / CEM / CRE CDM Compliance
Specialist MEP and plant systems in depot
£180M · 2016–2019

Old Oak Common Depot

Bombardier Transportation

Senior Construction Engineer and CRE (D&C) for Specialist Depot, Plant & Equipment. Lead NEC Supervisor for all construction and M&E activities, site-wide testing, commissioning and operational handover.

CRE (D&C) NEC Supervisor
MEP installation on major construction project
£240M · 2011–2016

Thameslink Hornsey & Three Bridges

Siemens Infrastructure

Senior Construction Engineer and CRE for Specialist Depot, Plant & Equipment across two major Thameslink depots. Multi-disciplinary delivery, NEC leadership and full commissioning of systems.

CRE (D&C) Multi-disciplinary
Modern residential development
Residential Portfolio

Residential Acquisition & Renovation

SPAG Construction Ltd

DASH Accredited residential procurement, leasing and renovation. Quality-focused asset improvement and RTM management for leasehold properties.

DASH Accredited RTM
Telehouse West data centre exterior, Docklands
2008–2010

Telehouse West – Docklands

MACE Group

Quality Assurance & Commissioning Manager for full MEP systems. Led IST, performance verification, FAT/SAT, defect management and complete handover documentation for a critical data centre facility.

QA / Commissioning Data Centre

Career Journey

20+ Years of Delivery

2024 – 2026

Lead Project Engineer

TfL – Cockfosters & Northfields Depots

Designated Engineer for Specialist Depot Systems & MEP. Technical interfaces, HAZID/HAZOP, testing & commissioning in live environments.

2019 – 2024

Designated Project Engineer / CEM

MACE – Network Rail NW&C Region

Full engineering lifecycle for depots, stations and sidings. Primary technical interface (DPE/CEM/CRE) for M&E and buildings.

2016 – 2019

Senior Construction Engineer

Bombardier – Old Oak Common Depot (£180M)

CRE (D&C) Specialist Depot Plant & Equipment. Lead NEC Supervisor for all construction and M&E activities.

2011 – 2016

Senior Construction Engineer

Siemens – Thameslink Hornsey & Three Bridges (£240M)

CRE for Specialist Depot systems across two major Thameslink depots. Multi-disciplinary NEC delivery and commissioning.

2010 – 2011

Asset Engineer

UK Power Networks

HV/LV feeder and substation upgrades including HVAC in live operational environments. Asset management strategy development.

2003 – 2010

Construction & Commissioning Roles

MACE · Network Rail · First Engineering

Progressed from Site Supervisor (Managed Station of the Year 2005–06) through Construction Manager to QA & Commissioning Manager on major schemes including Telehouse West.

Get in Touch

Ready to discuss
your next project?

Whether you need technical assurance, project delivery support, or residential property services — let’s talk.

Phone +44 775 181 2550
Email [email protected]
Company SPAG Construction Ltd · Company No. 11892056
Director Stuart Powell · CB Eng, FCABE, MCIOB, MCMI

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Or email directly: [email protected]