Renewable Energy Subcontractor: Our Capabilities for M&E Firms

Why M&E Firms Need a Specialist Renewable Energy Subcontractor

The Future Homes Standard, tightened Part L regulations, and the practical extinction of gas connections in new developments mean that every M&E contractor now needs heat pump, solar PV, and battery storage capability. The question is whether you build that capability in-house or partner with a specialist renewable energy subcontractor who already has it. At Electromatic M&E Ltd, we work as a dedicated renewable energy subcontractor for M&E contractors across London, Surrey, and the wider South East — bringing MCS certification, qualified engineers, and a project management approach built specifically for integration with main contractor workflows.

Related reading: Heat pump subcontractor in London: why builders work with us | White-label heat pump installation for builders and contractors

Our Core Capabilities

Air Source Heat Pumps (ASHP)

Heat pumps are now the default heating specification for new builds and an increasingly common retrofit requirement. Our ASHP capability covers the full range of domestic and light commercial applications:

• Monoblock and split systems from leading manufacturers including Mitsubishi Ecodan, Vaillant Aroetherm, Samsung EHS, and Daikin Altherma
• Capacity range: 4 kW to 16 kW for individual dwellings; cascade configurations up to 60 kW for multi-unit or light commercial projects
• Hot water integration: Unvented cylinder specification, sizing, and installation — we handle the complete heating and hot water package
• Controls and commissioning: Full system commissioning, weather compensation setup, and end-user handover documentation
• MCS compliance: Every installation is registered under our MCS certification, ensuring the end client can access the BUS Grant (subject to eligibility criteria set by Ofgem) and that the project meets all regulatory requirements

Solar Photovoltaic (PV) Systems

Solar PV is now a standard requirement under Part L 2021 for new dwellings and increasingly specified in commercial refurbishments. Our solar capability includes:

• Roof-mounted systems from 2 kWp to 50 kWp, covering domestic, multi-unit residential, and commercial buildings
• Panel brands: We work with tier-one manufacturers including JA Solar, Trina, and Canadian Solar
• Inverters: SolarEdge, GivEnergy, Solis, and Huawei — selected based on project requirements and monitoring needs
• MCS registration: All domestic installations registered under MCS, enabling Smart Export Guarantee (SEG) eligibility
• DNO applications: We handle G98 and G99 applications to UK Power Networks (UKPN) as standard
• Structural assessments: We coordinate with structural engineers where roof loading requires verification

Battery Energy Storage Systems (BESS)

Battery storage is increasingly specified alongside solar PV to maximise self-consumption, provide backup power, or enable time-of-use tariff optimisation. We install:

• Domestic batteries: GivEnergy, Tesla Powerwall, and Fox ESS — typically 5–13.5 kWh per unit
• Commercial storage: Larger capacity systems for offices, retail, and multi-unit developments
• Hybrid inverter integration: Single-inverter solutions that combine solar PV and battery in one package
• Retrofit battery additions to existing solar PV systems

Hot Water Systems

Heat pump installations almost always require a hot water cylinder. We specify, supply, and install:

• Unvented cylinders: Telford, Kingspan Tribune, and Megaflo — sized to match heat pump output and occupancy
• Heat pump-optimised cylinders with enlarged coils for low-temperature heat transfer
• Plant room layouts for multi-unit developments with centralised or individual systems

Certifications and Qualifications

When you subcontract renewable energy works, you need confidence that the certification chain is robust. A single compliance failure can hold up building control sign-off, delay handovers, and create costly rework.

All certifications are current and audited annually. We can provide copies of certificates, insurance schedules, and RAMS documentation as part of any subcontractor onboarding process.

Team and Capacity

Electromatic M&E Ltd operates with a team of qualified engineers, giving us the capacity to run multiple concurrent projects without compromising quality or timelines.

Current capacity

• Heat pump installations: 15–20 systems per month
• Solar PV installations: 10–15 systems per month
• Concurrent project capability: We can service 3–4 active sites simultaneously
• Lead time: Typically 2–4 weeks from confirmed order to mobilisation, depending on equipment availability

Scaling for larger projects

For multi-plot developments or large commercial projects, we can scale capacity through our network of vetted, directly supervised operatives. We have delivered phased installations across developments of up to 30 units, coordinating with main contractors to match the build programme.

How We Integrate with Main Contractor Workflows

Pre-construction phase

• Design input: We provide heat loss calculations, system sizing, cylinder specifications, and plant room layouts during the design phase
• SAP contributions: We supply the heating and renewable energy inputs for SAP assessments, working directly with your SAP assessor
• Value engineering: If the specification needs adjustment to meet budget or programme constraints, we can propose alternatives with clear cost and performance implications
• RAMS and method statements: Provided in advance of mobilisation, tailored to each site

Construction phase

• Programme integration: We work to your programme, attending site meetings and providing realistic durations for first fix, second fix, and commissioning phases
• First fix coordination: We install pipework, cable runs, and mounting brackets during the first fix phase, coordinating with your plumbing and electrical subcontractors to avoid clashes
• Second fix and commissioning: We complete connections, mount external units, commission systems, and complete MCS documentation
• Defects and snagging: We attend snagging inspections and resolve any defects within agreed timescales

Handover and close-out

• MCS certificates for every installation
• Building control documentation including commissioning records, system schematics, and compliance certificates
• End-user handover packs with operating instructions, warranty information, and maintenance schedules
• BUS Grant administration — we handle the application, approval, and redemption process for each qualifying dwelling
• O&M manuals in the format required by your client

Project Types We Support

New-build residential developments

From single custom builds to developments of 30+ plots. We provide the complete low-carbon heating and renewable energy package: heat pump, solar PV, battery storage, and hot water systems — all registered under MCS and compliant with Part L 2021 and the Future Homes Standard.

Retrofit and refurbishment

Social housing upgrades, local authority retrofit programmes, and private refurbishment projects. We work within ECO4, HUG2, and SHDF funding frameworks where applicable.

Light commercial

Offices, retail units, churches, schools, and community buildings. Systems from 16 kW to 60 kW, including cascade heat pump configurations and larger solar PV arrays.

Multi-unit residential

Purpose-built flats and apartment buildings with individual or communal heating systems. We design and install both individual ASHP-per-unit solutions and centralised plant room configurations.

Why M&E Firms Choose Electromatic

Single point of responsibility

Rather than coordinating separate subcontractors for heat pumps, solar PV, batteries, and hot water, you get one point of contact and one subcontract for the complete renewable energy package. This simplifies your procurement, reduces interface risk, and gives you a single party accountable for the integrated system performance.

MCS certification without the overhead

Obtaining and maintaining MCS certification is expensive and administratively burdensome. By subcontracting to Electromatic, your projects benefit from full MCS compliance — without your firm needing to carry the certification overhead.

Local knowledge

We are based in the London and Surrey area, with deep knowledge of local planning conditions, UKPN connection requirements, and building control expectations across Richmond, Kingston, Twickenham, Hampton, and the wider South East.

Commercial flexibility

We work under standard JCT or bespoke subcontract terms. We can price on a per-plot basis for developments, fixed price for defined scopes, or day rates for smaller works. We are open to framework agreements for ongoing partnerships.

Frequently Asked Questions

Can Electromatic work under our company branding?

Yes. We offer white-label installation services where we work as your team on site. The end client sees a seamless service under your company name, while we provide the technical delivery and MCS certification. See our article on white-label heat pump installation for details.

What geographical area do you cover as a subcontractor?

Our primary operating area covers London, Surrey, and the surrounding boroughs — including Richmond, Kingston, Twickenham, Hampton, Hounslow, Wandsworth, and Merton. For larger projects or framework agreements, we can extend our coverage across the wider South East.

How does MCS certification work when you are subcontracting?

All installations are completed under Electromatic’s MCS certification via our accredited umbrella partner. This means the end client receives an MCS certificate, which qualifies them for the BUS Grant (subject to eligibility criteria set by Ofgem) and SEG registration. We handle all MCS administration, consumer code requirements, and quality assurance — your firm does not need its own MCS registration.

What is your typical lead time for mobilisation?

For standard projects, we can typically mobilise within 2–4 weeks of confirmed order, subject to equipment availability. Multi-plot developments are programmed in phases to match the build sequence.

Do you provide design services or just installation?

We provide both. Our design capability includes heat loss calculations (MCS compliant), system sizing, SAP inputs, plant room layouts, and solar PV yield assessments. We can work from your specification or develop the design from scratch — whichever suits your project.

Ready to Discuss a Subcontractor Partnership?

If your M&E firm needs a reliable, certified renewable energy subcontractor, we would welcome the opportunity to discuss how we can support your projects.

Contact us for a subcontractor enquiry →

Call us: 07718 059 284 | Email: admin@electromatic.uk

We respond to all subcontractor enquiries within 24 hours.

The information in this article is for general guidance only and does not constitute legal, regulatory, or commercial advice. Certification details and capacity figures are correct as of April 2026 and may change. The Boiler Upgrade Scheme (BUS) grant of £7,500 is subject to eligibility criteria set by Ofgem — not all properties qualify. Electromatic M&E Ltd operates under MCS certification via our accredited umbrella partner. All installations comply with Building Regulations Part L and MCS standards. E&OE.

Written by Electromatic M&E Ltd — ASHP & Solar installer, London & Surrey (electromatic.uk)

Last updated: April 2026 | Electromatic M&E Ltd, Company No. 13837345