Installer
Free, quick, sales-led
Paid for by the contract it hopes to win - so it leans toward the bigger system. Quotes arrive on different tariffs, discount rates and loss assumptions. Nothing about them is comparable.
Stage1Energy
Rank the estate before you spend on any of it.
Independent, fixed-scope, signed off by a person before it is issued. Identical assumptions on every roof, so the ranking means something.
Join the waiting list to register interest for assessments.
The gap
Free and unrankable, or rigorous and expensive.
Consultant-grade assumptions, applied identically across every roof you want ranked - before anyone visits anything.
Consultant
Proper, per site
A site visit and defensible numbers - priced for the roof you have already decided to build on. Costly when you need the same standard across an estate.
Stage1Energy
Identical, rankable
Every site runs on the same assumptions - five roofs or five hundred. Where a client-supplied figure differs from the rest, the report says so.
Estate filter
Take out the buildings you cannot build on. Not the ones you think will not work.
Real exclusions first
Short lease, planned disposal, listed status, end-of-life roof - make those before you send us anything. A roof due for replacement is often the cheapest moment to install.
Not exclusions
Roof size, orientation, age and gut feel are the questions the screen answers - not reasons to drop a building.
What the car park cannot see
Economics turn on self-consumption and your import tariff at that meter. A small roof on a 24/7 building will beat a large roof on a weekday office.
A roof wrongly included costs you one assessment. A roof wrongly excluded costs you the whole site - and you never find out.
If you can fund five installs this year, you want the best five across the estate you can build on - not the handful you already liked.
What this gets you
What changes after you commission the report.
You commission surveys for the roof you are going to build. This report is how you find out which roof that is.
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01
Bad sites stopped early
Surveys, engineers and DNO applications only on roofs worth the spend.
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02
The size that earns
Five scenarios on one layout - payback, NPV, self-consumption, budget, max capacity.
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03
The deciding assumption, named
The number the case turns on, the range it holds, and what happens outside it.
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04
Bookable carbon
Self-consumed vs export, declining grid path - a figure finance can defend.
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05
No incentive to say yes
We do not install or design. We publish how often we recommend against.
How every report is built
From the roof you have to the decision you need.
Seven stages in buyer order - is it worth doing, how big, what could stop it, what happens Monday. The same standard whether you bring one roof or a hundred.
Method chain
01 / 07
Every report is read and signed off before it is issued - verdict, conditions, and next actions written by a person. Material figures trace to a formula and a named source in the same document.
Same method on every roof - start with the waiting list.
Quality & independence
What you can rely on.
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01
Human review
Verdict, conditions and next actions written by a person. Signed off by Ted Evans - one site or a hundred.
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02
Independence
We do not install, procure or design. If we ever take a referral fee, we will say so on the site.
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03
Recommend-against
We publish how often we recommended against proceeding - including against a pursue case.
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04
Checked against meters
One operating array vs twelve months of metered generation - inside tolerance. One comparison, not a validation programme.
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05
Sourced figures
Material numbers trace to named sources. Defaults are stated, not hidden.
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06
Fixed fee
Join the waiting list to register interest. Written terms when capacity opens.
Applied assumptions
Assumptions are recorded in every report.
UK commercial defaults, printed with sources. Override any of them with bills, tariffs or a firm grid quote.
- Analysis life
- Discount rate
- Panel degradation
- System losses
- O&M costs & escalation
- Tariff escalation
- Carbon intensity
See the outputs on the assessment preview.
3D site model
Near-field shading is modelled, not assumed.
Buildings, parapets, plant and trees become a 3D scene - not a flat loss factor.
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01
Open LiDAR
National LiDAR fused with Google massing in one environment.
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02
Solstice views
Winter and summer - morning, midday, afternoon - at stated sun positions.
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03
Hand-marked detail
Flues and small chimneys below LiDAR (~1 m) marked by hand with height.
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04
Named dataset
EA National LIDAR 1 m, OGL v3. England and Wales; elsewhere, manual inputs.
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05
Feasibility grade
Enough to spot a real obstruction problem before anyone visits.
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06
Solstice row spacing
Winter solstice midday clearance - geometric, stated, identical on every roof.
What happens next
Where this sits in a project.
On roofs we recommend against, most of this never happens. That is the point - spend the next stages only where they earn.
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Structural & wind
Load and uplift screens now; chartered engineer ballast design later on sites you pursue.
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Shading
3D model and solstice views in every report. Per-panel design belongs to the installer.
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Setbacks
Geometric minimum for fair comparison. Fire and access setbacks are larger at design - treat our count as a ceiling.
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Costs
Comparable CAPEX build-up now; firm quote later. Report states the cost at which the recommendation flips.
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Tariffs & grid
Named national series until you supply a rate. Submit G99 early - it is the long pole on most sites.
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What this report is for
Board or investment decision and budget release. Liability sits in the terms of engagement.
After the ranking
From roofs that work to solar on the roof.
The report shortlists where the case holds. Everything after that only happens on those roofs.
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01
Pursue the shortlist
Board-ready verdicts on the roofs worth capital - park the rest before you spend on surveys.
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02
Clear the blockers
Structural, wind, DNO and planning next steps named in the report - commission them only where you pursue.
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03
Test the market
Installer quotes against the break-even cost in the report - so you know the day a quote lands whether it still works.
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04
Design and build
Layout, MCS design and install on the roofs you have already decided to take forward.