Water Efficiency Calculations

EPCs for Domestic & Non-Domestic Buildings

An Energy Performance Certificate (EPC) is a legal requirement for most buildings in England and Wales when they are constructed, sold, or rented. EPCs provide an assessment of a building’s energy efficiency, carbon emissions, and potential improvements, helping owners and occupiers understand energy performance and running costs.

This service provides accurate, compliant EPCs for both domestic and non-domestic properties, produced using approved methodologies and accepted by all relevant authorities.

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What Is an EPC?

An Energy Performance Certificate rates a building’s energy efficiency on a scale from:

A (most efficient)
G (least efficient)

The EPC includes:

Current energy efficiency rating
Environmental impact (carbon emissions) rating
Estimated energy costs
Recommendations to improve performance

EPCs are lodged on the official government EPC register and are valid for 10 years, unless a new EPC is required due to building works or regulation changes.

When Is an EPC Required?

An EPC is required when a building is:

Failure to provide an EPC can result in financial penalties and enforcement action.

Newly Constructed

All new buildings must have an EPC before completion and occupation.

Sold or Let

EPCs are required when marketing a property for sale or rent.

Converted or Newly Created

Where a new dwelling or commercial unit is created through conversion or change of use.

Domestic EPCs (SAP-Based)

Domestic EPCs are produced using SAP calculations and apply to:

New build houses and flats
Residential conversions
New dwellings created through extensions

Domestic EPC Process:

SAP calculations completed at as-built stage
Final construction and services data confirmed
EPC generated and lodged

Accurate SAP data ensures a reliable EPC rating and avoids delays at completion.

Non-Domestic EPCs (SBEM-Based)

Non-domestic EPCs are produced using SBEM calculations and apply to:

Offices
Retail units
Industrial and warehouse buildings
Schools and healthcare buildings

Non-Domestic EPC Process:

SBEM calculations completed at as-built stage
Building services and lighting data verified
EPC generated and lodged

Non-domestic EPCs assess operational energy use based on building type and usage.

EPCs for New Build Developments

For new build projects, EPCs are typically produced alongside:

SAP calculations (domestic)
SBEM calculations (non-domestic)
BREL / Part L documentation

Providing EPCs as part of a coordinated compliance package ensures:

Consistent data across all reports
Faster Building Control sign-off
Reduced risk of errors or rework

EPCs for Existing Buildings

EPCs may also be required for:

Existing properties being sold or let
Buildings undergoing major refurbishment
Compliance with minimum energy efficiency standards (MEES)

Where improvements have been made, a new EPC can reflect the upgraded performance.

EPCs & Minimum Energy Efficiency Standards (MEES)

For rented properties, EPC ratings are linked to Minimum Energy Efficiency Standards (MEES).

Current requirements include:

A minimum E rating for most rented properties
Ongoing proposals to raise standards in future

Accurate EPCs help landlords:

Demonstrate compliance
Identify improvement opportunities
Avoid enforcement penalties

EPC Recommendations & Improvements

Each EPC includes a list of recommended improvement measures, which may include:

Insulation upgrades
Heating system improvements
Lighting efficiency upgrades
Renewable energy options

While recommendations are advisory, they can support:

Compliance planning
Funding or grant applications
Long-term energy savings

EPCs & Building Regulations

For new build and converted properties, EPCs are closely linked to:

Current requirements include:

Building Regulations Part L
SAP or SBEM calculations
BREL reports

EPCs must reflect the as-built condition of the building to ensure consistency with Building Control submissions.

What Information Is Required?

To produce an EPC, the following information is typically required:

Domestic EPCs

As-built SAP calculations
Final construction details
Heating and hot water system specifications

Non-Domestic EPCs

As-built SBEM calculations
Lighting layouts
HVAC and controls information

All data is reviewed to ensure accuracy before lodging.

EPCs for Developers & Contractors

EPCs are commonly required for:

Single dwellings
Multi-plot housing developments
Commercial developments

This service supports:

Plot-by-plot EPC production
Phased developments
Fast turnaround at completion stage

Early coordination avoids delays to handover or occupation.

Why Use a Specialist EPC Service?

Accredited domestic and non-domestic assessors

EPCs produced from verified SAP / SBEM data

Fast turnaround and lodging

Fully compliant with current regulations

Accepted by all authorities and agents

The focus is on accurate, reliable EPCs with no last-minute issues.

Energy Performance Certificates (EPCs)