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How We Work

One company. The whole job.

Most retrofit programmes involve three or four different companies. An assessor, a coordinator, separate installers for each measure, and somebody in the middle trying to hold it all together. We take a different approach.

We do it all ourselves.

When you appoint Three Phase, you get one company managing the full process. The assessment, the coordination, the installation, the compliance. One team, one contract, one point of contact from the first survey right through to the final lodgement.

Our Retrofit Assessors survey every dwelling and put together the improvement plan. Because they work for the same company as the installers, the recommendations reflect what can actually be delivered on site. No disconnect between what gets specified and what gets built.

A dedicated Retrofit Coordinator then looks after the programme. Scheduling, measure sequencing, quality checks and householder communications all sit with one person who knows the job inside out.

When it comes to the install, the same team turns up each day. They know the site, they know the programme, and they take pride in the work. Solar PV, heat pumps, storage heaters, insulation and all the associated electrical works — all carried out by our people.

Once the work is done, we lodge everything through TrustMark, handle the MCS certification, update the EPCs and make sure every piece of documentation is audit-ready before we leave. One number to ring if anything needs attention after that.

Every measure, under one roof.

Here is what sits within our capability. Every one of these is carried out by our own qualified people.

Retrofit Assessment and Coordination

PAS 2035 qualified assessors and coordinators on our team. We manage the full pathway from dwelling surveys through to TrustMark lodgement.

Solar PV and Battery Storage

Domestic and commercial systems, MCS certified. Installations that qualify for the Smart Export Guarantee and government funding programmes.

Air Source Heat Pumps

System design, installation, commissioning and homeowner handover. MCS certified, delivered under funded programmes or privately.

Electrical Contracting

NICEIC approved. Rewires, fire alarms, intruder alarms, emergency lighting, periodic testing and three-phase installations.

Insulation

External wall, internal wall, cavity, loft and underfloor. Coordinated alongside heating and electrical upgrades as part of a single programme.

Compliance and Lodgement

TrustMark, MCS, EPC updates and all supporting documentation. Audit-ready before we leave site.

From Scotland to Penzance.

We go where the work takes us. Properties that are off gas and difficult to reach are part of what we do. We look after the logistics and accommodation so our teams can deliver the same standard of work wherever the property happens to be.

Ferries, accommodation, materials — all sorted before we arrive.

731+
Measures installed through CHiL
UK Wide
From Scotland to Penzance
Accreditations and Certifications
MCS Certification
MCS
Microgeneration Certified
NICEIC Approved
NICEIC
Approved Contractor
PAS 2035
PAS 2035
Retrofit Standard
HIES
HIES
Consumer Protection
ISO Certified
ISO Certified
9001 · 27001 · 45001
SWIP IWI
SWIP IWI
Insulation Warranty
Construction Online
Constructionline
Verified Member
MCS Certification
MCS
Microgeneration Certified
NICEIC Approved
NICEIC
Approved Contractor
PAS 2035
PAS 2035
Retrofit Standard
HIES
HIES
Consumer Protection
ISO Certified
ISO Certified
9001 · 27001 · 45001
SWIP IWI
SWIP IWI
Insulation Warranty
Construction Online
Constructionline
Verified Member
Let us show you how we work.

If you are planning a retrofit programme, managing a housing stock upgrade, or need an electrical contractor you can rely on, we would welcome the conversation.

What happens next
1We come back to you within one working day
2We discuss what you need and how we can help
3We put together a clear plan and timeline
Send us an enquiry
We will come back to you within one working day.