BACKMYDECISION

Proof-backed solar decisions · UK beta

Expensive solar decision?Sense-check the numbers.

Compare an independent estimate with your installer's claims before you spend—then record the real result and see which was closer.

Check my solar quote →See exactly how it works

No contact details · No sales calls · About one minute

Model estimatevsInstaller quotevsActual result
BACKMYDECISION MODEL · 2026.08SOURCED · UK
THE QUESTION

Does this installer's solar claim stack up?

Outcome check12 months
MODEL ESTIMATE£820–£1,060illustrative annual benefit
Assumptions visible
VS
INSTALLER QUOTE£1,050claimed annual benefit
Claim recorded before purchase
12M

Return with the outcomeThe comparison resolves only when the real result is added.

Illustrative example · Every live result includes its method and sources.

DON'T TRUST OPINIONS.

✦

TRUST RECORDED RESULTS.

✦

SEE WHO GETS IT RIGHT.

UK solar quote checker

Turn the sales pitch into checkable facts.

Paste the quote to extract its promises automatically, then check them against your home, tariffs and an independent range. Your figures stay on this device.

Start with the seller's own words

Paste the quote.
Extract the promises.

BackMyDecision looks for the system size, price, annual saving, generation and payback claims, then moves them into the independent checker. Nothing is uploaded to our servers.

PDF, Text, CSV, Markdown and JSON are read automatically in your browser. Files never leave this device.
YOUR HOMEQUICK CHECK
Include a home battery?
Current quick-check defaults26.11p/kWh import · 15p/kWh export · regional generation factor · simple payback · no finance, degradation or maintenance cost
How this estimate is calculated

Generation starts with system size and a regional annual yield, then adjusts for direction and shade. Benefit combines electricity used at home with exported electricity. The range varies the result by ±16% to show uncertainty.

Read the full method, limitations and dated sources →

?

YOUR SOLAR OUTLOOK

Waiting for the facts.

Complete the inputs to create an illustrative, source-linked forecast.

The method

Opinion ends.
Accountability starts.

01

Record the assumptions

Your tariff, roof, system cost and an installer's claimed saving are captured before the outcome is known.

02

Compare like with like

The model and installer claim sit side by side, with their differences and assumptions made visible.

03

Return automatically

Save a timestamped receipt and calendar reminders, then add the real result and see which forecast was closer.

Founding outcome cohort

Evidence starts with real returns.

The public accuracy board will open only after real homeowners return with comparable outcomes. Until then, this beta creates private, timestamped decision receipts.

  • 01 Every saved forecast includes a model version
  • 02 Calendar reminders bring the decision back
  • 03 Actual results compare model and installer error
YOUR AUTOMATED RETURN LOOPLIVE NOW
NOWSave the forecast

A dated receipt records the model, quote and assumptions.

30DCheck installation

An optional calendar reminder asks whether the plan changed.

12MAdd the outcome

Enter the real annual benefit and compare prediction error.

No manufactured winner.

Public scores appear only when there is enough comparable real-world evidence.

One method, progressively better evidence

Quick first. Detailed when it matters.

Every result shows what went in, what was assumed and what still needs a professional check.

QUICK CHECKSix essentialsBill · roof · shade · usage
QUOTE EXTRACTSeller promisesPrice · saving · generation
AUTOMATEDDecision receiptTimestamp · model version · reminders
RETURNActual resultModel error · installer error

YOUR QUOTE IS READY TO CHECK.

Before you spend thousands,
extract the promises.

Paste my quote ↑