Home Energy Efficiency Annual Checklist fo

Most UK households set a smoke-alarm reminder but never schedule an equivalent home energy health-check. Yet a single afternoon spent ticking off the tasks below — once a year, every year — keeps heating safe, insulation effective, solar earning its keep, and your energy tariff as cheap as possible. Here is every task worth doing, organised by system.

1. Boiler and Heating System

Annual service by a Gas Safe registered engineer. Gas boilers must be serviced by an engineer on the official Gas Safe Register — it is a legal and warranty requirement. A standard service costs £80–£150 depending on location and boiler age, though London prices can reach £160. The engineer checks for leaks, tests combustion efficiency, inspects the flue, and verifies controls — any of which, if faulty, costs far more to fix later. Book in September or October before the winter rush.

Check the flow temperature. If you have a combi or system boiler, reducing the flow temperature to 55–60 °C forces the boiler into condensing mode more consistently. Research cited by the Energy Saving Trust suggests this can improve efficiency from around 80% to over 90% and save approximately £112 per year in a well-insulated home with no noticeable loss of comfort.

Bleed radiators. Air trapped in radiators causes cold patches at the top and makes the boiler work harder. Bleeding them takes five minutes per radiator with a radiator key and a cloth.

Inspect the thermostat and programmer. Smart thermostats such as Hive or Nest can reduce heating bills by 10–15% through better scheduling. If your programmer is more than ten years old, replacement is worthwhile.

2. Insulation Check

Loft insulation depth. Current building regulations and Energy Saving Trust guidance recommend a minimum of 270 mm of mineral wool insulation. The standard installation method lays 100 mm between the joists and 170 mm cross-laid on top. If your loft has less than this — common in homes built before 2000 — topping up can save up to £315 per year in a typical semi-detached house, according to Energy Saving Trust estimates.

Cavity wall insulation eligibility. Homes built between roughly 1920 and 1995 commonly have an unfilled cavity wall. If your EPC rating is D or below and you receive qualifying benefits (Universal Credit, Pension Credit, or similar), you may be entitled to free cavity wall insulation through the Energy Company Obligation (ECO4), which runs until 31 December 2026. Even without benefit eligibility, the Great British Insulation Scheme may cover partial costs. Check via the Simple Energy Advice helpline on 0800 444 202.

Draught-proofing. Gaps around doors, windows, letterboxes, and pipework are among the cheapest energy losses to fix. Self-adhesive draught-strip kits cost under £20 per door. Focus first on the main entrance, the loft hatch, and any suspended timber floors — these are the biggest leakage points.

3. Solar Panel Inspection

Visual inspection from the ground. Walk around the building and check for cracked, discoloured, or heavily soiled panels; damaged mounting rails; and any visible loose wiring. Binoculars help. Most issues visible from below warrant a professional visit before they escalate.

Monitor output data. Pull up your inverter app and compare monthly generation figures to last year's. A year-on-year drop of more than 5–8% that cannot be explained by shading or weather suggests a fault. Our guide to solar panel maintenance in the UK explains what to look for in monitoring data and when to call an installer.

Panel cleaning. In the UK, rain typically keeps pitched-roof panels at around 95% of peak output without manual intervention. However, panels at a shallow tilt (below 15°), near trees, in coastal areas, or beneath a bird flight path benefit from professional cleaning every 12–18 months. Costs run £4–£15 per panel depending on access. Annual maintenance including inspection and cleaning typically costs £100–£300 per year.

Inverter and isolator check. The AC isolator and DC isolator should be tested for correct operation once a year — this is typically part of an annual service by an MCS-certified installer. Isolators can corrode outdoors, particularly in coastal locations.

4. Battery Storage Health Check

Review state-of-health (SoH) in the app. GivEnergy, Tesla Powerwall, Fox ESS, and other battery systems report a SoH percentage in their monitoring apps. A reading below 80% before ten years of operation is worth querying with the installer — most batteries carry a 10-year warranty. See our detailed guide on whether solar batteries are worth it for the financial context around replacement.

Check ventilation clearances. Most indoor batteries need a minimum clearance on each side for heat dissipation. Confirm nothing has been stacked against the unit since installation.

Software updates. Battery firmware is updated remotely by most manufacturers, but log in to the management portal to confirm auto-update is enabled and that the system is running current firmware — older versions can miss efficiency improvements or safety patches.

5. Smart Meter and Tariff Review

Take or verify meter readings. Smart meters submit readings automatically, but it is worth checking the in-home display once a quarter to confirm the readings align with your bills. If your smart meter shows a communications error (a common issue with first-generation SMETS1 meters), contact your supplier — a firmware update often resolves it at no cost.

Review your tariff against the Ofgem price cap. Ofgem sets a quarterly price cap for default tariffs. From 1 July 2026, the cap for a typical household rises to £2,005 per year — a 13% increase driven by higher wholesale gas prices. If you are on a variable default tariff, use a comparison site to check whether a fixed rate or a time-of-use tariff (such as Octopus Agile or Intelligent Go) would be cheaper given your usage pattern. Households with solar and a battery can often save significantly on a time-of-use tariff by charging overnight at off-peak rates.

Check your Smart Export Guarantee (SEG) rate. SEG rates from different suppliers vary considerably. Switching SEG supplier is free and takes a few weeks. Review available rates annually — our guide to the best SEG rates keeps the current figures updated.

6. EPC Review and Upgrade Eligibility

Check your current EPC. Your EPC is stored on the national register at gov.uk/find-energy-certificate and is valid for ten years. If it is close to expiry, or if you have added solar panels or insulation since it was last assessed, commission a new assessment — a higher EPC rating typically increases resale value and may unlock better mortgage rates.

Warm Homes Plan eligibility. The government's Warm Homes Plan, launched in January 2026 with £15 billion of public investment over five years, funds solar panels, batteries, heat pumps, and insulation for lower-income households. Eligibility is income- and EPC-linked. Check at gov.uk/warm-homes-plan or via your local authority.

Seasonal Reminders

Autumn (September–October): Book boiler service before winter rush; check loft insulation; apply draught-proofing; set heating programmer to winter schedule; review tariff ahead of Q4 price cap change.
Spring (March–April): Clean solar panels before the high-generation summer season; review battery state-of-health; compare SEG export rate; check inverter monitoring data vs last year.
Summer (June–July): Take a quarterly meter reading; check tariff options for time-of-use switching; review EV charging schedule to maximise solar self-consumption during peak generation months.
Winter (December–January): Monitor boiler pressure and top up if below 1.0–1.5 bar; bleed any cold radiators; check smart meter for connectivity; compare winter solar generation against PVGIS baseline to spot underperformance early.