HOUSE | VS | GRID

Methodology

How we calculate

We turn tariffs, installation quotes, usage patterns and measured performance into clear comparisons, showing the assumptions behind every pound, payback period and saving.
Read our methodology

Our methodology

What data does house | vs | grid use?

We combine supplier prices, published tariffs, government data and measured household usage to model realistic ownership costs.

Which assumptions affect the maths?

Every result states its assumptions, including installation costs, energy prices, degradation, financing, maintenance and expected equipment lifespan.

Are your savings figures guaranteed?

Savings depend on your home, tariff and habits. Our figures are estimates, not guarantees, and should support—not replace—personal advice.

How often do you update calculations?

We update calculations when prices, tariffs, incentives or product specifications change, recording the date and source for each analysis.

Do affiliate links influence your rankings?

Affiliate relationships may earn us commission, but they do not decide rankings. Our comparisons follow the published methodology and disclosed evidence.