About
Delta T is a renewables-focused heating company covering Oxfordshire and Buckinghamshire. Run by director Chester and Adam, the business has grown from 8 to 15 people over the last three years - doubling year-on-year, entirely through word of mouth.
Three years ago, Delta T made the decision to drop gas, oil and LPG entirely and focus solely on renewables. That decision paid off, but it created a new problem: as the volume of heat pump installs grew, every job still had to route through Chester.
Since adopting Spruce, the team works independently across every stage of the process, and Delta T has had its strongest three years of trading.
"Spruce is essentially another employee in the background doing all the other bits. As long as you've put the right data in there, everyone's clear on what's gonna be happening." — Chester, Director
The Challenge
Delta T has always had thorough processes, but linking them together was a key issue. Chester would gather customer information, calculate heat losses, determine system sizing, and piece together proposals from data spread across three separate tools — one for quotes, another for designs, and a third for MCS documentation. Each did its job, but nothing connected them.
Everything routed through Chester
As the MCS-certified installer, Chester was the only person who could complete certain compliance steps. Engineers could do surveys and installs, but the documentation - heat loss sign-off, MCS paperwork, handover packs - all came back to him. The team had their own roles, but every job converged on one desk.
"Each individual's got their own role within the company and it all comes together within the one pack. But it was all reliant on myself being the MCS-certified person to fill all of that out."
A process that couldn't keep up
When Delta T was doing fewer heat pump installs, Chester could keep on top of it. But as the business doubled year-on-year, the bottleneck tightened. Site visits alone took three hours - an hour each way and an hour with the client. Back in the office, Chester was transferring data between systems and checking compliance forms on top of everything else.
The Solution
Chester now runs Delta T's heat pump workflow through Spruce, starting from the enquiry form on their website. Customer details come in directly, Spruce pulls the EPC data, and the team can send an itemised estimate before anyone has left the office; where previously Chester would have needed to manually review the enquiry, estimate the heat loss, and size the system himself.
"If you don't get back to the client soon enough, they will lose interest. If other people have got there quicker than you, then the homeowner is likely to go with a more responsive installer."
From there, survey data, heat loss calculations, proposals, and MCS documentation all sit in one place. Enter the information once and it carries through. But the real shift is who can do what: engineers now have their own installation packs with all the notes and specifications ready on site. Admin staff can handle compliance steps that previously only Chester could touch. Everything runs smoothly even when Chester's not at his desk.
"You can quite easily get different people within your team to do their own segments of work. It's not all reliant on myself."
The Result
Key outcomes:
Reduced admin time: Hours cut from each individual enquiry
More team collaboration: Multiple people working on different parts of each job simultaneously
Strong growth: 100% year-on-year for three consecutive years
The time Chester has got back isn't going into more admin. He and Adam have used it to work on the business - refining their installation process, improving how jobs run on site, and doing the kind of operational thinking that gets squeezed out when you're buried in paperwork.
For customers, the difference shows up early. They get an itemised estimate that breaks down exactly what each part of the system costs, so they can make informed decisions about their budget before Delta T even visits the property. Chester describes it as clarity - the customer knows what to expect rather than just seeing a figure at the bottom of a page.
"We've always been fairly good at providing the estimate initially. But it's cut hours off responding to each individual enquiry. Once they start coming in faster, that just compounds."
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