Energy assessment before buying a house

What energy information to check before purchase

Ask for available drawings, renovation records, heating-service history and energy bills, then compare them with the visible building envelope and systems. Annual bills are useful evidence, but they also reflect weather, household size, indoor temperatures, hot water, tariffs, controls and occupancy; they do not describe the fabric alone.

• Construction age and known wall, roof or attic insulation
• Window and door type, condition and available U-values
• Roof, attic, floor and foundation details where available
• Heating source, distribution, controls and maintenance records
• Ventilation type, extract points and signs of inadequate air change
• Energy bills with the period, fuel type and occupancy context
• Past renovation documents, warranties and remaining unknowns

Likely areas to inspect more closely

Look for incomplete insulation information, cold or damp-looking surfaces, staining around openings, roof or plumbing concerns, and condensation on windows. These observations are prompts for appropriate inspection, not proof of a cause.

Thermal bridges, air leakage and hidden construction can have a material effect on comfort and heat loss but are not confirmed by an online input record. Where uncertainty is important to the purchase decision, request a survey by a suitable local professional.

Questions to ask before buying an older house

Use this concise checklist to make a viewing or document request more systematic.

• What is known about the roof, attic, walls, floors and foundations?
• When were windows, heating equipment and ventilation last replaced or serviced?
• Which rooms feel cold, humid or difficult to ventilate?
• Are there records of leaks, mould, condensation or repairs?
• What assumptions explain the energy bills: occupancy, temperatures and fuel prices?
• Which renovation measures would need to be coordinated rather than done separately?
• Which unknowns need a survey before a renovation allowance is set?

Turn the assessment into a purchase-planning record

Enter what is documented, mark what is uncertain and use the estimated heat-loss breakdown to focus later questions. The result can help outline possible renovation implications, but it cannot guarantee running costs, building condition or a purchase outcome.

Prepare a property energy checklist

Use the available property information to identify gaps and next questions before purchase.