E J Smart Ltd delivers complete mechanical packages for commercial new-build — heating, ventilation, fire duct and sprinklers — and specialist plumbing and HIU services for domestic customers across London.
Full mechanical packages for main contractors and developers — heating, ventilation, fire duct, sprinklers and cold water. Plus ongoing PPM and reactive maintenance for existing installations.
HIU repairs and servicing, domestic plumbing and heating for homeowners and residents across London. Fast, qualified, fully insured.
Every project is managed directly by our in-house team. We take full responsibility for quality and programme — from first fix to commissioning — ensuring consistent standards on every contract.
We work with main contractors and developers as specialist mechanical sub-contractors on new-build residential and commercial schemes across London. Ready to price your next scheme.
Complete mechanical packages for multi-unit residential developments, from groundworks through to commissioning — including heating, ventilation, sprinklers and cold water.
Design, installation and commissioning of central plant rooms for residential and mixed-use developments.
Centralised and distributed heating systems for new-build and refurbishment projects across London.
Mechanical ventilation systems and fire duct installations for residential and commercial new-build schemes across London.
Design and installation of commercial and residential sprinkler systems for new-build developments, fully compliant with BS EN 12845 and BS 9251.
Mains-fed and boosted cold water systems, RPZ valves, backflow prevention and TMV installations.
Full system commissioning, hydraulic balancing, O&M documentation and structured handover.
Mechanical works within occupied or partially occupied buildings with minimal disruption.
Planned preventative maintenance and reactive call-out services for existing plant rooms and mechanical installations across London and the South East.
From urgent HIU breakdowns to planned annual servicing — we're the specialist your managing agent or housing provider should already have on speed dial.
Heat Interface Units are complex pieces of equipment — and when yours fails, it often means no heating and no hot water. We understand the urgency, which is why HIU fault diagnosis, repair and servicing is a core part of what we do.
We work across district heating networks throughout London, covering all major HIU manufacturers. Our engineers are Gas Safe registered and trained specifically on HIU systems.
Pinpoint the exact fault quickly — we carry common parts to resolve most systems in a single visit.
Regular HIU servicing keeps your system efficient, your warranty valid, and your bills lower.
Scaling and fouling are the most common HIU failures. We replace heat exchangers across all major makes.
Zone valves, flow control valves and thermostatic controls diagnosed and replaced by certified engineers.
Restore circulation and efficiency with professional powerflush treatment for blocked or sludged systems.
Annual service records, safety certificates and engineer reports for responsible landlords.
Full bathroom installations, showers, baths and sanitaryware fitted to a high standard.
New radiator installation, replacement, TRV upgrades and balancing for even heat distribution.
Emergency leak detection and repair, including trace-and-access and insurance-ready reports.
Unvented and vented hot water cylinder repair, replacement and G3 compliance certification.
We're not a box-ticker. A hands-on team with real project experience, real accreditations, and a reputation we protect on every job.
Every project is directly managed and supervised by our own team. We own the programme, the quality, and the outcome — with no buck-passing down the line.
We've delivered full M&E packages on multi-storey residential developments as principal mechanical sub-contractor, with direct accountability to the main contractor from day one.
Heat Interface Units are our domestic specialism. We diagnose fast, carry spares, and resolve most faults in a single visit — minimising disruption for residents.
Gas Safe registered, full public liability and employer's liability insurance, and Constructionline-ready documentation for any main contractor's supply chain requirements.
Whether you're a main contractor pricing a new-build scheme, a developer seeking a reliable M&E sub-contractor, or a resident with a heating emergency — we want to hear from you.