Now open
Waiting list
Register
One site or a portfolio
Tell us roughly how many roofs you are weighing. We will be in touch when capacity opens.
Join waiting list What an assessment includesStage1Energy
Rank every roof before you commit capital.
Assessments open by waiting list. Register interest for one roof or the whole estate.
First building free. £2,250 for one site - per-site cost falls steeply with volume.
Join the waiting list
Register interest for assessments. We open capacity in order - one roof or the whole estate.
Our offers
Most estates start by testing us on one building. The free one exists for that. It is not meant to become the shortlist.
Start here
Free Full Assessment
Free
One building
Capacity, yield, and indicative capex - with a written verdict.
How we work Request free assessmentFull report
Single Site Assessment
£2,250
One building
25-year model with engineering flags and named next steps.
What’s in a report EnquireMost chosen
Four-Site Pack
£4,950
Up to four buildings
£450 more than two singles
Four ranked reports plus a one-page board summary.
What’s in a report See Pack pricingProgrammes
Portfolio Assessment
From £1,200
Per building · five and up
£1,200 at 20 · £900 at 100
Same report standard on every roof, sequenced by priority.
How we work Price your portfolioWhy Stage1Energy
over the usual options
Not an installer. Not a day-rate consultancy. Independent feasibility for estates teams who need a board-safe answer.
Independent
Free installer studies sell panels. We deliver a pursue-or-park verdict - no sales agenda attached
Speed
1–5 sites in 5 working days once we have your data - 5+ sites take longer
Board-ready
Written recommendation with named assumptions and next steps - not an open-ended consultancy slog
Detailed modelling
LiDAR, financial, energy & engineering - engineering flags DNO connection, planning and permits, not detailed design calcs
Independent by design
A clear written recommendation - with evidence and named next steps. Independent of installers. Join the waiting list to register interest.
The fee is the same whether the verdict is pursue or park. A clear written recommendation - with evidence and named next steps. If the report doesn’t give you that, we rework it at no extra cost.
From roof to written verdict
How an assessment runs - without installer theatre.
01
Site & aerial inputs
02
Yield & returns model
03
Pursue / conditional / park
04
Named next steps
Latest insights
See all insights →Feasibility
What is a commercial solar feasibility study?
What a board-ready study covers - and what it deliberately leaves to others.
Returns
Is commercial solar worth it in the UK?
How to read payback, IRR, and hurdle rates without installer theatre.
Process
Feasibility study vs installer quote
Why the order matters when capital and roofs are on the line.
