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Explore insightful articles on energy efficiency, EPC regulations, and how EPC Certify helps Essex homeowners, landlords, and estate agents.
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Replacing an outdated boiler or electric storage heaters with a modern condensing boiler or low-carbon system can significantly boost the score.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.

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.
  6. 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.
  7. 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.

  8. 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.

  9. 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.

  10. 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.

Mike Hopper - November 2025
Mike Hopper - November 2025
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A1 service - Mike Hopper - November 2025
 R Harrison - August 2025
R Harrison - August 2025
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Supplier Feedback: David Pears was a true professional who seems to know every aspect of his job extremely well. No problem at all in recommending or using him again for all EPCs in the future. Website Feedback: Perfectly functional for required needs EPC, Westcliff-on-sea, R Harrison - August 2025
R Mehta - July 2025
R Mehta - July 2025
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Supplier Feedback: David was extremely professional, efficient, and knowledgeable throughout the entire EPC assessment process. He arrived promptly, explained everything clearly, and carried out the assessment with great attention to detail. What really stood out was his friendly and approachable manner — he made the whole experience smooth and stress-free. The report was delivered quickly and was well-presented and easy to understand. I wouldn’t hesitate to recommend David to anyone needing an EPC. Outstanding service — thank you! Website Feedback: Excellent and easy to use. EPC Assessment , Westcliff On Sea, R Mehta - July 2025
T Walsh -July 2025
T Walsh -July 2025
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 Supplier Feedback: David was very professional from first point of contact to the last when evaluating the EPC on my flat. Would definitely recommend him to anyone needing an EPC evaluation. Energy Performance Certificate, Essex, T Walsh - July 2025
A Kasprzak - July 2025
A Kasprzak - July 2025
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Supplier Feedback: Thank you for your feedback, please feel free to contact us should you need any further assistance. Much appreciated, Team EPC Certify  Energy Performance Certificate, Essex, A Kasprzak - July 2025
D Reeves - August 2025
D Reeves - August 2025
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Supplier Feedback: Knowledgeable and punctual EPC Assessment, Southend-on-sea, D Reeves - August 2025
Sveta King - September 2025
Sveta King - September 2025
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Dave was very thorough, noted all the information, and acted very professionally. He recommended improvements on EPC and electrical installation works that were very useful. I will use his services again. - September 2025
Claire Walden - October 2025
Claire Walden - October 2025
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Dave was excellent. He arrived on time, was very knowledgeable and prompt in providing EPC. Could not recommend highly enough! Thanks again for such a great service. Claire Walden - October 2025
M - August 2025
M - August 2025
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Supplier Feedback: Very professional and friendly man would definitely recommend him in the future. Website Feedback: Amazing EPC, Leigh On Sea Essex , M - August 2025
Hiedi Crudgington - August 2025
Hiedi Crudgington - August 2025
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David was very professional, gave a quick turn around with the paperwork, will definitely be using his services again for our next property ! Thank you so much again ! - August 2025
M Keen  - August 2025
M Keen - August 2025
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Supplier Feedback: Arrive on time, very efficient and I had the EPC Certificate by the end of the day. I would definitely recommend EPC Certify and David Pears to anyone. Website Feedback: Arrive on time, very efficient and I had the EPC Certificate by the end of the day. I would definitely recommend EPC Certify and David Pears to anyone. Energy Performance Certificates (EPC), Rayleigh, Essex, M Keen - August 2025
David Salmon - October 2025
David Salmon - October 2025
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Dave Pears attended EPC assessment same day and issued findings same day. Needed urgently for mortgage purposes. Top man !! David Salmon - October 2025
J - August 2025
J - August 2025
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  Supplier Feedback: Website Feedback: Dave came round literally in an extremely short time frame as I needed an epc for my first time buyers to progress with our sale. He spent time completing our survey and as speed was priority, sent it the same day, couldn’t really ask for a better service. The price was inline with those with much longer waits. So thankful for this service. Epc , Westcliff On Sea , J - August 2025   
Michael White - October 2025
Michael White - October 2025
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Excellent quick service. - October 2025
Robin Main - October 2025
Robin Main - October 2025
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Dave was prompt and informative in responding to my initial inquiry and providing a quote. He conducted the survey at short notice, arrived on time, was amiable and efficient during the survey process and provided me the results same day. Thank you! Robin Main - October 2025
Paul Fowler - October 2025
Paul Fowler - October 2025
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Absolutely professional and outstanding service! I wouldn’t hesitate to recommend David for your EPC or any electrical work – he goes above and beyond every time.Absolutely professional and outstanding service! I wouldn’t hesitate to recommend David for your EPC or any electrical work – he goes above and beyond every time. - October 2025
Shiuly Ahmed - October 2025
Shiuly Ahmed - October 2025
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David was so knowledgeable and explained everything when I asked him any questions. Gave me an appointment and actually turned up unlike some and completed the survey and uploads in an exceptionally timely fashion. Highly recommend. Shiuly Ahmed - October 2025
Clement Lawford - November 2025
Clement Lawford - November 2025
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Following my search on the .gov. website for a certify EPC assessor, I came across David on the list. I contacted David who was able to do the work on the same day. David was polite and friendly. I was able to download the report and certificate within a short time after his departure. I am very happy with this service. Clement Lawford - November 2025
Rene Dolphin - November 2025
Rene Dolphin - November 2025
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Really pleased attended and issued certificate quickly and reasonable price, so pleased thank you. Rene Dolphin - November 2025
   Anne Jones - November 2025
Anne Jones - November 2025
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David did an EPC and EICR today. Turned up on time, very thorough, suggested a few improvements for the future. Very professional and friendly, would highly recommend and will use again. Anne Jones - November 2025
Isla Lightfoot - November 2025
Isla Lightfoot - November 2025
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A lovely guy and really prompt service. All done in less than 24 hours. Very reasonable cost wise as well. Highly recommend. Isla Lightfoot - November 2025
Michelle Smart January 2026
Michelle Smart January 2026
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David Pears did my EPC today. I must say how impressed I was with the fine details carried out during the EPC, he took his time to go through every detail of my home room by room and outside, to capture the information he needed. I was able to ask questions, and David was able to answer to the best of his knowledge. By the end of the working day I received my EPC certificate by email. I would definitely recommend David, he is very professional and personable. Michelle Smart January 2026
 Steven Dearlove January 2026
Steven Dearlove January 2026
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Very prompt service. Did two EPCs for me. Very Happy. Steven Dearlove January 2026
Luxe Property and Financial Services Ltd January 2026
Luxe Property and Financial Services Ltd January 2026
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Dave is friendly bubbly guy, easy to get along with and carries out his work swiftly whilst keep you updated. Highly recommended. Luxe Property and Financial Services Ltd January 2026
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