Overstory
Measuring the light

Approach
Four steps, one set of numbers.
The same team measures, sets the target, stays for the cuts and writes the report. Nothing is handed over a wall.
What you get, and when
Eighteen months, four handovers.
Press a step to see what lands on your desk at the end of it.
01Weeks 1 to 4Step 1 · Weeks 1 to 4
Measure
A footprint your auditor will sign.
We collect a year of energy, fuel, travel and purchasing data and turn it into a Scope 1, 2 and 3 footprint. Every figure is traced to a meter, an invoice or a supplier, so nothing has to be defended from memory later.
You get
- Baseline report
- A data room with every source
- A one-page summary for the board
You bring
- Twelve months of energy bills
- Fuel cards and travel records
- The purchase ledger
02Weeks 5 to 8Step 2 · Weeks 5 to 8
Target
A date and a slope you can defend.
We model three pathways against your growth plan and cost each one. You pick the pathway; we prepare the science-based target and manage the submission, so the board, the bank and your largest customer accept the same number.
You get
- Three costed pathways
- A net zero target ready for validation
- The board paper
You bring
- Your five-year growth plan
- Planned capital projects
- One hour with finance
03Months 3 to 18Step 3 · Months 3 to 18
Reduce
The cuts, in the order that pays.
A list of projects ranked by tonnes per pound, from heat and fleet to supplier contracts and green power. We stay on site with your operations team until the first third of the cut is delivered and measured.
You get
- A costed reduction plan
- A green energy tender
- Quarterly progress checks
You bring
- An operations lead
- Access to your sites
- Your ten largest suppliers
04Every yearStep 4 · Every year
Report
One set of numbers for everyone who asks.
The annual disclosure, the customer questionnaires and the impact report all come from the same checked dataset. It arrives ready for assurance, with the working attached.
You get
- Annual ESG disclosure
- Answers to customer questionnaires
- An impact report you can publish
You bring
- The year's data, in the model we leave you
- Two review meetings
What you get, and when
Eighteen months, four handovers.
Press a step to see what lands on your desk at the end of it.
01Weeks 1 to 4Step 1 · Weeks 1 to 4
Measure
A footprint your auditor will sign.
We collect a year of energy, fuel, travel and purchasing data and turn it into a Scope 1, 2 and 3 footprint. Every figure is traced to a meter, an invoice or a supplier, so nothing has to be defended from memory later.
You get
- Baseline report
- A data room with every source
- A one-page summary for the board
You bring
- Twelve months of energy bills
- Fuel cards and travel records
- The purchase ledger
02Weeks 5 to 8Step 2 · Weeks 5 to 8
Target
A date and a slope you can defend.
We model three pathways against your growth plan and cost each one. You pick the pathway; we prepare the science-based target and manage the submission, so the board, the bank and your largest customer accept the same number.
You get
- Three costed pathways
- A net zero target ready for validation
- The board paper
You bring
- Your five-year growth plan
- Planned capital projects
- One hour with finance
03Months 3 to 18Step 3 · Months 3 to 18
Reduce
The cuts, in the order that pays.
A list of projects ranked by tonnes per pound, from heat and fleet to supplier contracts and green power. We stay on site with your operations team until the first third of the cut is delivered and measured.
You get
- A costed reduction plan
- A green energy tender
- Quarterly progress checks
You bring
- An operations lead
- Access to your sites
- Your ten largest suppliers
04Every yearStep 4 · Every year
Report
One set of numbers for everyone who asks.
The annual disclosure, the customer questionnaires and the impact report all come from the same checked dataset. It arrives ready for assurance, with the working attached.
You get
- Annual ESG disclosure
- Answers to customer questionnaires
- An impact report you can publish
You bring
- The year's data, in the model we leave you
- Two review meetings
What you get, and when
Eighteen months, four handovers.
Press a step to see what lands on your desk at the end of it.
01Weeks 1 to 4Step 1 · Weeks 1 to 4
Measure
A footprint your auditor will sign.
We collect a year of energy, fuel, travel and purchasing data and turn it into a Scope 1, 2 and 3 footprint. Every figure is traced to a meter, an invoice or a supplier, so nothing has to be defended from memory later.
You get
- Baseline report
- A data room with every source
- A one-page summary for the board
You bring
- Twelve months of energy bills
- Fuel cards and travel records
- The purchase ledger
02Weeks 5 to 8Step 2 · Weeks 5 to 8
Target
A date and a slope you can defend.
We model three pathways against your growth plan and cost each one. You pick the pathway; we prepare the science-based target and manage the submission, so the board, the bank and your largest customer accept the same number.
You get
- Three costed pathways
- A net zero target ready for validation
- The board paper
You bring
- Your five-year growth plan
- Planned capital projects
- One hour with finance
03Months 3 to 18Step 3 · Months 3 to 18
Reduce
The cuts, in the order that pays.
A list of projects ranked by tonnes per pound, from heat and fleet to supplier contracts and green power. We stay on site with your operations team until the first third of the cut is delivered and measured.
You get
- A costed reduction plan
- A green energy tender
- Quarterly progress checks
You bring
- An operations lead
- Access to your sites
- Your ten largest suppliers
04Every yearStep 4 · Every year
Report
One set of numbers for everyone who asks.
The annual disclosure, the customer questionnaires and the impact report all come from the same checked dataset. It arrives ready for assurance, with the working attached.
You get
- Annual ESG disclosure
- Answers to customer questionnaires
- An impact report you can publish
You bring
- The year's data, in the model we leave you
- Two review meetings
01of 08Still unsure?Send us your last energy bill and a headcount. We reply with a rough footprint inside two working days.Ask a consultantQuestions
What clients ask before the first call.
- With a baseline call. In 40 minutes we work out which data you already hold, usually energy bills, fuel cards and purchase ledgers, and what a first footprint would take. Most companies have 70 percent of what they need.
- Six to nine weeks for a single-country business, a little longer with many sites. The time goes on collecting data, not on calculating.
- A first footprint starts at £14,000 and a full net zero strategy at £22,000. Every proposal has a fixed price and a list of what you receive.
- We prepare targets to the science-based standard and manage the submission. Sixty-two of our clients hold a validated target today.
- No. About half our clients start without one. We work with finance and operations and leave you with a data model one person can run.
- No. We have no stake in what you buy. If removals belong in your plan we help you specify and tender them.
- It depends on size, listing and where you sell. The first week of an ESG engagement is a scoping note that answers exactly this.
- We stay for the first year on a light retainer: quarterly reviews against the pathway and help when a lever turns out harder than modelled.
01of 08Still unsure?Send us your last energy bill and a headcount. We reply with a rough footprint inside two working days.Ask a consultantQuestions
What clients ask before the first call.
- With a baseline call. In 40 minutes we work out which data you already hold, usually energy bills, fuel cards and purchase ledgers, and what a first footprint would take. Most companies have 70 percent of what they need.
- Six to nine weeks for a single-country business, a little longer with many sites. The time goes on collecting data, not on calculating.
- A first footprint starts at £14,000 and a full net zero strategy at £22,000. Every proposal has a fixed price and a list of what you receive.
- We prepare targets to the science-based standard and manage the submission. Sixty-two of our clients hold a validated target today.
- No. About half our clients start without one. We work with finance and operations and leave you with a data model one person can run.
- No. We have no stake in what you buy. If removals belong in your plan we help you specify and tender them.
- It depends on size, listing and where you sell. The first week of an ESG engagement is a scoping note that answers exactly this.
- We stay for the first year on a light retainer: quarterly reviews against the pathway and help when a lever turns out harder than modelled.
01of 08Still unsure?Send us your last energy bill and a headcount. We reply with a rough footprint inside two working days.Ask a consultantQuestions
What clients ask before the first call.
- With a baseline call. In 40 minutes we work out which data you already hold, usually energy bills, fuel cards and purchase ledgers, and what a first footprint would take. Most companies have 70 percent of what they need.
- Six to nine weeks for a single-country business, a little longer with many sites. The time goes on collecting data, not on calculating.
- A first footprint starts at £14,000 and a full net zero strategy at £22,000. Every proposal has a fixed price and a list of what you receive.
- We prepare targets to the science-based standard and manage the submission. Sixty-two of our clients hold a validated target today.
- No. About half our clients start without one. We work with finance and operations and leave you with a data model one person can run.
- No. We have no stake in what you buy. If removals belong in your plan we help you specify and tender them.
- It depends on size, listing and where you sell. The first week of an ESG engagement is a scoping note that answers exactly this.
- We stay for the first year on a light retainer: quarterly reviews against the pathway and help when a lever turns out harder than modelled.

Start here
Book a baseline call.
Thirty minutes with a consultant. You leave with a rough footprint, the two biggest cuts and what a full pathway would cost.
Your call: Pick a size and a service
No cost, no deck. Replies inside one working day.

Start here
Book a baseline call.
Thirty minutes with a consultant. You leave with a rough footprint, the two biggest cuts and what a full pathway would cost.
Your call: Pick a size and a service
No cost, no deck. Replies inside one working day.

Start here
Book a baseline call.
Thirty minutes with a consultant. You leave with a rough footprint, the two biggest cuts and what a full pathway would cost.
Your call: Pick a size and a service
No cost, no deck. Replies inside one working day.