Whether you’re constructing a new property or selling an existing one, Energy Performance Certificates (EPCs) play a key role in demonstrating a building’s energy efficiency. But the standards for new builds and existing homes differ significantly.

✅ EPC Requirements for New Builds

New build properties in the UK typically achieve an EPC rating of B or above, although there is no blanket statutory minimum EPC band for new builds. This is due to strict Part L Building Regulations (concerning energy performance), which mandate:

  • Highly efficient insulation and glazing

  • Low-carbon heating systems like heat pumps

  • Energy-efficient lighting

  • Use of renewable energy (e.g., solar panels) is often encouraged or required

Builders are required to submit SAP (Standard Assessment Procedure) calculations and achieve a high rating before a completion certificate is issued.

🏘️ EPC Requirements for Existing Homes

Existing homes must have a valid EPC when:

  • Being sold or rented

  • Undergoing major refurbishment

  • Applying for certain grants or funding

The legal minimum for rental properties in England and Wales is currently an E rating. However, the UK government has proposed that this minimum could be raised to a C rating by 2028 for new tenancies (subject to confirmation).

Key Differences

Feature New Builds Existing Homes
Minimum EPC Rating B (or higher) E (rental); none for sales, but recommended
Assessed Against SAP (Standard Assessment Procedure) RdSAP (Reduced SAP)
Regulation Part L of Building Regulations Minimum Energy Efficiency Standards (MEES)
Certification Required Before occupation Before sale/rent

 

Why It Matters

Achieving a higher EPC rating can:

  • Reduce energy bills

  • Increase property value

  • Make homes more attractive to buyers or tenants

  • Avoid fines for landlords who fall below legal standards

    Need an EPC in London?

    At EPCrate.co.uk, we are experienced EPC assessors providing fast, affordable, and compliant certificates across London.

EPCs for New Builds and Conversions in London

EPCRATE produces SAP-based EPCs for new builds and RdSAP assessments for existing homes across all 32 London boroughs. If you are buying or letting a recently built property, see our guides on new build EPC renewals and HMO EPC requirements. Developers and investors can use our bulk EPC services for multi-unit schemes.

Why Choose EPCRATE?

  • Founded in 2015 by Jino Jose, DEA accredited.
  • ★★★★★ Trustpilot Reviews.
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  • Greater London Energy Efficiency Awards – Commended 2024.
  • Greater London Energy Efficiency Awards – Highly Commended 2025.
  • Coverage across all 32 London boroughs.
  • Only London provider offering a Draft EPC review service.

Need an EPC in London? Next-day visits from £59, urgent same-day inspection with certificate issued on site £90, EPC + Floor Plan Bundle £118 (saves £20). Call 020 3488 4142.

Frequently Asked Questions

Do new builds automatically get a good EPC rating?

Usually — Part L Building Regulations demand high energy performance, so most new builds assess at B or above. The exact rating still depends on the design and systems installed.

Is the EPC for a new build done differently?

Yes. New builds are assessed under the full SAP methodology from plans and specifications, while existing homes use RdSAP based on a physical survey.

Do existing homes have a minimum EPC requirement?

For owner-occupied homes there is no minimum to sell. Rental properties are subject to minimum energy efficiency standards — currently an E for most lettings, with standards expected to tighten. Verify against current government guidance.

When does a new build need its EPC?

An EPC must be produced when a dwelling is constructed, and it is needed before marketing if the property is sold or let.

Can EPCRATE assess multiple new units in one visit?

Yes — bulk arrangements are available for developers and investors, including qualifying multi-unit studio conversions from £34.99 per unit in the same visit.



Written by Jino Jose

DEA Accredited Energy Assessor  ·  EPCRATE, London  ·  Founded 2015

Jino Jose is the founder of EPCRATE and an accredited Domestic Energy Assessor (DEA). He has carried out thousands of EPC assessments across all 32 London boroughs since 2015, with NDEA-accredited assessors at EPCRATE covering commercial properties.

✓ DEA Accredited ✓ NDEA Assessors for Commercial ⭐ Google 5.0 ⭐ Trustpilot 5.0

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