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Calling Owners – landlords – Tenants – Home Buyers – How are EPC ratings calculated?
EPC ratings are derived from the Standard Assessment Procedure (SAP), the UK government’s approved method for assessing energy performance in dwellings. The SAP score is a numerical value between 1 and 100+, representing the estimated cost of heating, lighting, and hot water. The higher the score, the more efficient the property.
This SAP score is then converted into the A – G band:
A (92-100) – Most efficient
B (81-91)
C (69-80)
D (55-68)
E (39-54)
F (21-38)
G (1-20) – Least efficient
Even small improvements – just 1 or 2 SAP points – can push a property into a higher rating band, improving marketability and regulatory compliance.
Typical SAP score gains from common improvements.
Here are some examples of how much a typical improvement might increase your SAP score, though actual results vary depending on the property’s size, age, and current condition:
Loft insulation (100mm → 270mm): +6 to 10 SAP points
Cavity wall insulation: +5 to 10 SAP points
Upgrading boiler to condensing model: +5 to 12 SAP points
Installing TRVs or smart thermostat: +2 to 4 SAP points
Switching all lighting to LEDs: +1 to 3 SAP points
Replacing single glazing with double glazing: +2 to 6 SAP points
Installing solar PV (e.g. 2kW system): +5 to 10 SAP points
Air Source Heat Pump (replacing electric heating): +10 to 20+ SAP points
Understanding the points impact helps landlords prioritise high-value improvements that could shift a property from, for example, a D (68) to a C (69) with relatively low effort.
What improvements are worth making?
It’s worth considering possible energy efficiency improvements as part of any wider work that’s being done on the property. Improvements could include:
Loft and Wall Insulation
Affordable, straightforward, and highly effective. Many older properties lack sufficient insulation and benefit immediately.
Heating System Upgrades
Replacing an outdated boiler or electric storage heaters with a modern condensing boiler or low-carbon system can significantly boost the score.
Windows and Glazing
Double or even secondary glazing improves thermal performance and tenant comfort, though it’s pricey.
Efficient Lighting
A quick win. Replacing old bulbs with LEDs is low-cost and measurable in SAP improvements.
Renewable Technology
Solar panels or heat pumps can be excellent long-term investments—especially when paired with government incentives or grant schemes.
Why does it matter?
Improving your EPC rating is more than a compliance issue – it’s also about protecting your investment. A better-rated property is easier to rent, cheaper to run, and more resilient to future regulation. Landlords should look to use their EPC report to identify tailored, cost-effective actions – and not underestimate the value of even small upgrades.
FAQ for EICR’s
Electrical Installation Condition Reports – clear answers with quick examples.
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1) What is an EICR?
An EICR is a formal inspection and test of a property’s fixed electrical installation (consumer unit, wiring, sockets, switches, lighting, earthing & bonding). It confirms whether the installation is safe at the time of testing and recommends any remedial work.
Example: Checking the fuse box (consumer unit), testing RCDs, and sampling circuits for insulation resistance and earth fault loop impedance.
Portable appliances (kettles, fridges, etc.) are not covered by an EICR – those are checked via PAT.
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2) Who needs one, and how often?
- Private rented homes (England, Wales, Scotland): at least every 5 years, or sooner if the last report says so.
- Owner-occupied homes: typically recommended every 10 years (and also at a change of occupancy/before buying or selling).
Example: A rented 2-bed flat that last passed in May 2021 will be due again by May 2026 unless the report set an earlier date.
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3) What do the EICR result codes mean?
- C1 – Danger present: immediate risk of injury – make safe straight away.
- C2 – Potentially dangerous: urgent remedial action required.
- FI – Further investigation: an issue needs investigating without delay to confirm safety.
- C3 – Improvement recommended: not unsafe, but upgrades advised.
Overall result: Any C1, C2 or FI makes the report Unsatisfactory. Only C3 (or none) is Satisfactory.
Example: Missing bonding to gas pipe = C2; cracked socket faceplate with live parts exposed = C1.
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4) What happens if my EICR is Unsatisfactory?
Arrange remedial works, then obtain written confirmation that defects were corrected (and further testing if required). For rented homes, complete works within the period specified by the report (often within 28 days, or sooner if stated) and share confirmation with the tenant and, if requested, the local authority.
Example: Your report shows a C2 for no RCD protection on a bathroom circuit. An electrician installs appropriate RCD protection and issues written confirmation so the installation can be re-assessed as safe.
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5) What does an EICR cover – and not cover?
- Covers: fixed wiring, consumer unit, sockets, switches, light fittings, earthing/bonding, and protective devices (RCD/MCB).
- Does not cover: portable appliances (PAT), fire alarms/emergency lighting or intruder alarms (have their own tests), EV chargers unless part of the installation being assessed, or non-electrical building defects.
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6) How should I prepare for the visit?
- Ensure clear access to the consumer unit and key sockets/switches (about 1m around the board if possible).
- Have someone available for access; secure pets; provide parking/permits if needed.
- Expect brief power interruptions during testing – switch off computers/servers in advance.
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7) How long does it take, and when do I get the report?
Duration varies by property size/complexity and by how many circuits require investigation. Reports are usually issued shortly after testing is complete, with a clear list of observations and a recommended re-test date.
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8) How long is an EICR valid?
Up to the recommended re-test date stated on the report (commonly 5 years for rented homes, 10 years for owner-occupied). If significant alterations or damage occur, an earlier inspection may be recommended.
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9) Who can carry out an EICR?
A qualified and competent person (e.g., registered with NICEIC/NAPIT or equivalent) who has the training, test equipment and insurance to perform inspection & testing.
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10) New build or recent rewire – do I still need an EICR?
New installations are issued an Electrical Installation Certificate (EIC). Your inspector sets the next inspection interval on that certificate. For rented homes, plan for a periodic inspection by the due date noted (often 5 years).
Note: Legal duties differ across the UK. Always follow the re-test date on your report and any local authority/licensing requirements.