GRAX is not just a roadmap — it is a value creation sequence. Build the operating strength first, then grow, raise, acquire or exit from a position of control.
FOR £1M–£50M FOUNDER-LED HVAC AND RENEWABLES BUSINESSES
Operating Partner for HVAC and Renewables Businesses
Fractional COO and Operating Partner support for HVAC, heat pump, solar and battery installers. For owners whose quotes, callouts and cash all still route through them.
Strategic Value Creation
The GRAX Roadmap
Build, scale, raise, acquire and exit on your terms through a cleaner, stronger operating foundation.
G
01
Grow
Total Alignment through the 7Ts Operating Model removes friction, lifts margin and builds the operating foundation everything else depends on. Build the foundation.
R
02
Raise
Predictable cash and a disciplined balance sheet do more than attract capital. They set the terms you get it on, and the room you have to move afterwards. Strengthen the terms.
A
03
Acquire
A working operating model and a documented playbook let you buy adjacent capability and integrate it without losing control of margin or quality. Integrate with control.
X
04
Exit
When the time comes, the value is already built in. Operational maturity and clean evidence produce stronger offers and better terms. Realise premium value.
Creating Strategic Optionality
Business Valuation is not next year’s problem. It is today’s scoreboard.
What your business is worth is being decided now, by how you price work, who holds the client relationships, whether your accreditations sit with the company or with you, and how much of the revenue renews without being re-won. Every one of those is an operating decision, and every one of them is still open.
Today’s Value Drivers
The business is being valued long before a transaction begins.
Operational Framework
The Operating Structure Behind Installers That Scale
Most installation businesses hit a ceiling somewhere between £1M and £10M. Not because the work dries up, but because everything that matters still needs the owner — pricing the job, unblocking the site, chasing the application for payment.
Rostone builds the operating structure that takes those decisions off your desk. Quoting, scheduling, commissioning, handover and collection become processes the business owns rather than tasks you carry. What follows is stronger margin per job, a business that performs without you in it, and a set of numbers that holds up when a buyer, lender or investor looks closely.
How We Deliver
Built before the transaction. Proven when it matters.
We embed the operating discipline, leadership cadence and accountability that make the business stronger long before a raise, an acquisition or an exit is on the table.
Deal Readiness
Accreditations in the company name, contracts that survive due diligence, records that reconcile. Ready for a buyer, lender or investor before the conversation starts.
Operational Clarity
One defined route from enquiry to quote to install to commissioning to handover to cash. Everyone works to the same standard, on every job.
Margin Expansion
Margin visible at job level, not just at year end. Revisits, unbilled variations and remedials stop quietly consuming the profit you thought you'd made.
Transferable Value
Client relationships, technical knowledge and delivery standards held by the business rather than the founder. That is what a buyer is actually paying for.
How Alignment Works
Most installers aren't held back by demand. They're held back by what happens between the quote and the invoice.
Electrification is putting more work in front of good installation businesses than most can convert. The constraint is rarely enquiries. It is quote turnaround, engineer availability, site supervision, commissioning paperwork and the time it takes to get paid. Fix those and the same pipeline produces more revenue at better margin, with less of it sitting on the owner.
What Alignment Changes
What changes on site, in the office, and in the bank.
Before
More activity creates more noise.
When growth stalls, most installation businesses add rather than fix. More input into an operating model that is already the constraint.
More lead generation into a quoting process that already has a backlog.
More engineers without the supervision to keep the work consistent.
More vans and more van stock, with more cash tied up in both.
More software bolted on where nobody owns the process underneath.
The Alignment Bridge
Rostone connects strategy, people, process and execution into one way of working.
Diagnose
We go through the last twelve months of jobs, margins, quotes and challenges to find where value is leaking and what is genuinely dependent on you.
Align
We set the operating model: who decides what, how work is priced and scheduled, what standard delivery has to meet, and which numbers the leadership team runs on.
Execute
We stay in the business while it embeds. Weekly cadence, live measurement, and course correction until the new way of working is the only way of working.
After
Total Alignment creates measurable results.
Instead of layering new initiatives onto an operating model that can't carry them, the work goes into clarity, control and systems that scale with the revenue.
Margin you can see – efficiency improvement through reduced friction.
Quotes that move – shorter turnaround from survey to priced quote, and a conversion rate you can forecast against.
Capacity without headcount – more delivered work per engineer, per van, per pound of overhead.
A business that runs without you –decisions, standards and relationships held by the company.
The problem is not lack of activity. It is lack of alignment. Rostone creates the operating clarity that makes everything else work.
Common Scaling Challenges
Five operational breakpoints that cap installation businesses
Every business is different, but the same five breakpoints show up whenever operations stop keeping pace with the work coming in.
01
Everything Routes Through the Owner
Quotes, pricing calls and site escalations all queue at one desk. We set the decision rules and authority limits that let the team move without you.
Decisions made without you
02
Every Engineer Works Differently
Output varies by who turns up. We build the repeatable standards and checks that make delivery predictable regardless of crew.
Repeatable delivery standards
03
Revisits and Remedials Eat the Margin
Rework rarely appears in the accounts as rework. We design prevention into the process so the margin you quoted is the margin you keep.
Prevention-led processes
04
The Promise and the Delivery Don't Match
Sales sets one expectation, site delivers another. We align what is sold with what is installed, so every job reinforces the reputation that wins the next one.
Brand-aligned delivery
05
The Business Can't Absorb Change
Work mix shifts, new technologies land, client requirements tighten. We build the change capability that lets you move into new work without the operation breaking.
Change-ready frameworks
Who We Work With
Built for installation businesses ready to scale with control
We work with established installers and contractors, typically £1M–£50M in revenue — owner-managed businesses, family firms and PE portfolio companies in HVAC, heat pumps, solar and battery, electrical, EV charging, building controls and retrofit.
Premium Client Fit
The right fit is not size alone. It is readiness to change how the business runs.
Rostone works best with businesses that have already proven they can win the work, and now need the operating structure to deliver more of it without the owner in every decision.
£1M–£50M
Revenue range with real operational complexity.
Growing Pains
Friction emerging as engineers, jobs and sites multiply.
Scalable Systems
Business Owners
Get out of the quoting inbox and off the end of every phone call, without the business losing a step.
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Operational Clarity
CEOs
Visibility into delivery and margin at job level, so you can see where the business is leaking value and act on it.
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Portfolio Growth
PE Investors
Operational upside in installation and electrification assets: margin, working capital and management depth, built inside the portfolio company.
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