The goal is to identify practical clues: drafts, cold rooms, hot rooms, high usage, old equipment, poor controls, and habits that affect the bill.
Safety matters. Do not open sealed equipment, alter electrical systems, block ventilation, or attempt work that requires a qualified professional.
Bills
Compare usage, not only dollars.
Drafts
Check doors, windows, attic hatches, outlets, and penetrations.
Insulation clues
Cold rooms, ice dams, and uneven temperatures can signal issues.
Heating/cooling
Check filters, vents, thermostats, and maintenance history.
Hot water
Review showers, laundry, leaks, and water-heater age.
Lighting/appliances
Check old bulbs, standby loads, and major appliances.
Start with bills
Collect 12 months of bills if available. Look for usage spikes, seasonal patterns, and months where total cost rose without a clear usage change.
Separate weather effects from behaviour. A cold winter or hot summer can change energy use even if habits are similar.
Walk the home slowly
Check each room for drafts, cold floors, condensation, blocked vents, unusual noises, poor airflow, and temperature differences.
Take photos and notes. A simple room-by-room list is more useful than trying to remember everything later.
Know when to call a professional
Electrical work, gas appliances, combustion safety, insulation in difficult areas, major HVAC work, and moisture problems may need qualified help.
If safety is involved, do not treat energy savings as a do-it-yourself experiment.
DIY audit worksheet
| Area | What to look for | Next step |
|---|---|---|
| Doors/windows | Drafts, gaps, condensation | Weatherstripping or professional assessment |
| Attic hatch | Cold draft or poor seal | Seal carefully if appropriate |
| Vents | Blocked supply or return | Clear furniture and rugs |
| Furnace/heat pump | Dirty filter, odd noises | Maintenance or service |
| Water heater | Leaks, age, long hot-water runs | Repair planning |
| Lighting | Old high-use bulbs | LED replacement where suitable |
DIY audit checklist
- Collect 12 months of energy bills.
- Compare usage by season.
- Walk every room and note comfort problems.
- Check doors and windows for drafts.
- Check filters and vents.
- Look for hot-water waste.
- Prioritize safety and professional work where needed.
Related guides
For broader home-cost context, see Property Costs Explained. For repair and replacement planning, see Repair Costs Explained. These related guides and should be used only where their topics are relevant.
FAQ
Is a DIY audit enough?
It can find obvious issues, but it does not replace a professional assessment for complex, safety, or building-envelope problems.
What should I check first?
Bills, drafts, filters, vents, thermostat habits, hot water, and obvious comfort problems.
Can sealing drafts cause problems?
Major air sealing can affect ventilation and combustion safety, so use caution and professional advice where needed.