Energy information should be useful, honest and easy to act on. That is what we aim to provide.

Energyguide.org.uk helps UK households understand energy costs, home efficiency, heating options, renewable technology and practical ways to reduce bills. The figures we publish are designed to help you compare options, ask better questions and make more informed decisions.

They are not promises, guarantees or personalised quotes. A home is not a spreadsheet. The same improvement can perform differently depending on the property, the people living in it, the installer, the local climate and the way energy is used day to day.

So our approach is simple: we use credible sources, explain uncertainty clearly and avoid pretending that estimates are more precise than they really are.

Our approach to energy data

We build our guidance around three principles:

Clarity
We want readers to understand what a figure means, what it includes and what it does not include.

Realism
Energy savings are affected by real-world conditions, not just laboratory performance or ideal assumptions.

Usefulness
Our data should help people make better decisions, even when the exact outcome will depend on their home.

That means we focus on practical ranges, typical scenarios and plain-English explanations rather than overcomplicated figures that look precise but may not reflect real life.

Where our information comes from

Energyguide uses publicly available data, recognised industry sources and market evidence to shape our estimates and guidance.

Depending on the topic, we may use information from:

• UK government energy statistics
• housing and building performance data
• fuel price and tariff information
• emissions factors for different energy sources
• product specifications and efficiency ratings
• installation cost data
• installer, manufacturer and retailer information
• industry reports and professional guidance
• academic research, field trials or monitored performance studies
• relevant regulations, schemes and technical standards

We give greater weight to sources that are current, transparent, UK-relevant and based on real-world evidence.

Where the evidence is mixed, limited or changing quickly, we aim to say so.

How we estimate savings

Energy savings depend on the measure being considered.

For example, insulation savings may depend on heat loss, existing insulation levels, heating fuel, property type and household behaviour. Solar panel savings may depend on system size, orientation, electricity prices, export payments and how much electricity is used in the home during the day. Appliance savings may depend on usage patterns and the efficiency of the product being replaced.

Because of this, our savings figures are based on typical scenarios rather than one-size-fits-all promises.

When estimating potential savings, we may consider factors such as:

• property type and size
• heating system and fuel type
• typical household energy use
• current and forecast fuel prices
• existing efficiency levels
• product performance
• installation quality
• expected lifespan of the measure
• carbon intensity of the fuel being saved or replaced
• real-world performance adjustments where appropriate

The goal is to give a sensible indication of likely savings, not to predict the exact outcome for every home.

Why your results may be different

Two households can install the same measure and see different results.

Your actual cost or saving may be affected by:

• how warm you keep your home
• how often your heating is on
• how many people live in the property
• whether you work from home
• the age and layout of the building
• existing insulation and ventilation
• local weather conditions
• your tariff and standing charges
• the quality of the installation
• maintenance and product performance over time
• changes in energy prices after installation

In some cases, a home improvement may increase comfort rather than reduce bills by the full technical saving. For example, after insulation, some households choose to heat previously cold rooms or keep the home warmer for longer. That is still a real benefit, but it can reduce the bill saving compared with the modelled energy saving.

How we handle installation costs

Installation costs are one of the hardest areas to estimate accurately because prices can vary widely between homes and regions.

When we publish typical costs, they are intended to help with early-stage planning. They are not a replacement for quotes from qualified installers.

Actual prices may vary depending on:

• property size
• building type and condition
• access requirements
• location
• labour costs
• material costs
• installer availability
• product specification
• scaffolding or specialist equipment
• electrical, plumbing or structural work
• remedial work before or after installation

Unless clearly stated, our cost estimates should be treated as typical guide prices. They may not include extras such as surveys, repairs, upgrades, redecoration, maintenance or replacement parts.

For major work, we recommend getting several quotes and checking that each quote covers the same scope of work.

Fuel prices and carbon figures

Fuel prices can change quickly, especially for gas, electricity, oil and LPG. Carbon figures also change over time, particularly for electricity as the UK grid changes.

When we calculate bill savings or carbon savings, we use the most suitable assumptions available at the time. These may include current tariffs, historic averages, government data, market rates or published emissions factors.

Because these inputs change, any savings estimate should be seen as time-sensitive. A figure that is reasonable today may need updating if energy prices, standing charges, export rates or emissions factors change significantly.

Where fuel prices are central to a calculation, we aim to make the underlying assumptions clear.

How often we review our figures

Different types of data need different review cycles.

Some assumptions move slowly, such as typical property characteristics or building fabric performance. Others can change much faster, such as energy prices, grant schemes, product costs and installer availability.

We review data when it is likely to affect the usefulness of our guidance, including changes to:

• gas and electricity prices
• standing charges
• government schemes
• building regulations
• product standards
• installation costs
• carbon emissions factors
• solar export rates
• heat pump, boiler and insulation markets
• appliance efficiency ratings

Where a topic is especially sensitive to price or policy changes, it may need more frequent review.

What our figures are useful for

Energyguide figures are intended to help you:

• compare different home energy improvements
• understand likely costs
• estimate possible bill savings
• estimate possible carbon savings
• decide whether an option is worth exploring
• prepare questions for installers
• understand what affects payback
• avoid unrealistic claims

They are most useful at the research and planning stage.

What our figures should not be used for

Our estimates should not be treated as:

• a guaranteed saving
• a fixed installation price
• a property-specific assessment
• a professional survey
• financial advice
• investment advice
• a legal or contractual figure
• a replacement for installer quotes
• a guarantee of eligibility for grants or schemes

Simple payback figures can be helpful, but they should be treated with caution. A calculation based on installation cost divided by annual savings does not usually account for future fuel prices, maintenance, finance costs, inflation, product lifespan or changes in household behaviour.

For high-cost improvements, the best decision will usually combine online research, professional advice and quotes based on your specific property.

Independence and transparency

Energyguide is built to help people understand their options, not to push one solution for every home.

A measure that works well for one property may be poor value for another. Solar panels, heat pumps, insulation, smart controls, batteries and efficient appliances all have strengths and limitations. Good guidance should explain both.

We aim to be clear about:

• what a measure can realistically achieve
• where savings may be uncertain
• what assumptions sit behind a figure
• what extra costs may apply
• when professional advice is needed
• when a technology may not be suitable

If Energyguide uses commercial partnerships, advertising or affiliate links, these should be clearly disclosed. Commercial relationships should not decide the savings assumptions or technical guidance used in our content.

Corrections and improvements

Energy data is never finished. Prices change, technology improves, new evidence becomes available and policy moves on.

When better data becomes available, we aim to improve our guidance. When we find an error, we aim to correct it. When a figure depends on uncertain assumptions, we aim to make that uncertainty visible rather than hide it.

Our goal is not to make energy decisions look simple. It is to make them clearer.

Referencing Energyguide data

You may reference Energyguide figures, but please do so responsibly.

When using our statistics, include:

• the relevant Energyguide.org.uk page
• the date you accessed the information
• the publication or review date shown on the page, where available
• any assumptions shown alongside the figure
• a note that the figure is an estimate, not a guaranteed result

Please do not present Energyguide estimates as exact savings, fixed costs or property-specific advice.

Our promise to readers

We know energy choices can involve large upfront costs and long-term consequences. Readers deserve information that is clear about both the opportunity and the uncertainty.

Energyguide aims to provide data that is:

• practical
• transparent
• UK-focused
• regularly reviewed
• based on credible sources
• clear about its limitations
• useful for real household decisions

We will not always be able to tell you exactly what a measure will save in your home. But we can help you understand the likely range, the main variables and the questions to ask before you spend money.