Commercial EPC Changes in Scotland: What Building Owners Need to Know

Could your commercial building receive a different EPC rating under
Scotland's reformed assessment system? For owners, landlords, investors
and asset managers, this is an important question when planning a sale,
letting, refurbishment or programme of energy improvements.

Scotland is reforming the way non-domestic Energy Performance
Certificates are calculated and presented. The reforms are intended to
provide clearer information about calculated energy performance,
regulated energy use and direct emissions.

However, the reformed regime is not yet in force. Commercial property
owners must continue to comply with the current Scottish EPC requirements
while monitoring the revised implementation timetable.

What Is the Current Position for Commercial EPCs in Scotland?

Until the reformed regime comes into force, commercial EPC assessments in
Scotland continue under the existing regulations and approved assessment
methodology.

A valid non-domestic EPC is generally required when a commercial building
is:

• Constructed
• Sold
• Offered for let to a new tenant
• Subject to the relevant public display requirements

The precise requirement depends on the type of property, its use and the
transaction or regulatory trigger involved. Owners should obtain
building-specific advice where the position is unclear.

What Does a Commercial EPC Assess?

A commercial EPC is an asset rating. It assesses the calculated
performance of a building using standard assumptions so that its result
can be compared consistently with other buildings.

The assessment considers features such as the building fabric, heating,
cooling, ventilation, hot water, lighting, controls and renewable energy
systems.

It does not directly measure the amount of energy consumed by the
building's occupants. Actual energy use can be affected by occupancy,
operating hours, tenant equipment, control settings, maintenance,
commissioning and the way the building is managed.

This distinction is important. Two commercial buildings with similar
EPC ratings can use very different amounts of energy in operation.

Why Is Scotland Reforming Commercial EPCs?

The Scottish Government is reforming EPCs to make the information provided
by certificates clearer and more useful. The reforms are also intended to
strengthen the accuracy, oversight and quality assurance of the EPC
system.

The current non-domestic EPC system has limitations when comparing
properties with different activities and energy profiles. A hotel,
office, shop and warehouse can have very different servicing needs and
patterns of use.

The reformed approach introduces a reference building comparison for the
principal Energy Performance Rating. A reference building is a
standardised version of the assessed building. It provides a more
consistent basis for comparing calculated energy performance.

The reforms should provide owners, prospective tenants, purchasers,
investors and lenders with a more rounded view of a commercial property's
calculated performance.

What Will Change on a Commercial EPC in Scotland?

The reformed non-domestic EPC is expected to present three principal
performance indicators. Each answers a different question about the
building.

Energy Performance Rating

The principal A to G rating will compare the assessed building with a
standardised reference building. This is intended to improve comparison
between commercial properties with different uses and energy profiles.

Energy Use Indicator

The Energy Use Indicator will show calculated regulated energy use under
standard assessment conditions.

Regulated energy relates to the building services included within the
approved calculation method. It does not represent every source of energy
consumed by a tenant or occupier and should not be read as a prediction of
the building's energy bill.

Direct Emissions Indicator

The Direct Emissions Indicator will show calculated direct greenhouse gas
emissions associated with energy used at the building.

This indicator will be particularly relevant when reviewing fossil fuel
heating, heat decarbonisation options and the longer-term direction of the
building services strategy.

A building may perform relatively well against one indicator but less well
against another. Improvement planning should therefore consider energy
demand, building fabric, services efficiency and direct emissions
together.

How Are Commercial EPC Assessments Calculated?

Non-domestic EPCs use an approved building energy calculation methodology.
The appropriate assessment route depends on the type of building, its
servicing strategy and the complexity of the installed systems.

Many commercial buildings can be assessed using the Simplified Building
Energy Model, commonly called SBEM. More complex commercial buildings may
require dynamic simulation modelling.

Dynamic simulation modelling can represent complex geometry, servicing
arrangements and building systems in greater detail. Level 5 accredited
energy assessors are qualified to assess buildings that require this more
detailed route.

Accurate results depend on reliable evidence. Drawings, specifications,
operation and maintenance manuals, commissioning records, controls
descriptions and evidence of installed equipment can help the assessor
avoid unnecessary default assumptions.

When Will the Commercial EPC Changes Start?

The introduction of the new non-domestic EPC regime is no longer expected
to begin in late October 2026. A revised commencement date is awaited
from the Scottish Government.

This means the reforms should not be described as current requirements.
Existing Scottish commercial EPC rules continue to apply until the new
regime formally comes into force.

Owners should monitor the live Scottish Government update where a sale,
letting, construction completion or displayed-certificate requirement may
fall near the eventual changeover date.

Transitional Arrangements

Transitional arrangements are expected to manage the change from the
existing EPC framework to the reformed system. The associated dates will
depend on the revised commencement date.

The treatment of an individual EPC may depend on when it was issued, the
relevant regulatory trigger and whether the building is subject to display
requirements.

Owners should not assume that an existing certificate will remain valid
through the transition without checking the final arrangements applying to
the property.

How Long Will a Commercial EPC Be Valid?

Under the current Scottish framework, a commercial EPC can remain valid
for up to 10 years.

Under the reformed regime, the validity period for a new non-domestic EPC
is expected to reduce to five years.

The five-year period does not describe every EPC in circulation today.
The position for an individual certificate will depend on its issue date,
the revised commencement date and the final transitional arrangements.

Will Existing Commercial Buildings Need a New EPC Immediately?

Commercial properties are not expected to require an immediate
reassessment merely because the assessment system changes. An EPC will
generally be required at the applicable regulatory trigger, subject to the
final commencement and transitional arrangements.

This is particularly important for owners planning transactions or
managing properties subject to display requirements. Check the status of
each certificate and obtain property-specific advice rather than relying
only on its printed expiry date.

Could Your Commercial EPC Rating Change?

It may. A building's future rating will depend on the approved calculation
methodology, the reference building comparison, the building fabric and
services, and the evidence available during the assessment.

A current Scottish EPC result should not simply be converted into a future
rating without carrying out an appropriate assessment. A strong or weak
rating under the current method does not, by itself, determine the outcome
under the reformed assessment.

This uncertainty should be managed through accurate modelling and
appropriate evidence rather than assumptions.

Will Installing a Heat Pump Improve a Commercial EPC?

A heat pump should not be assumed to deliver a particular EPC rating
automatically.

The calculated result depends on the whole building model, including its
fabric, heat pump efficiency, heating and cooling distribution,
ventilation, hot water, lighting, controls and renewable generation.

The engineering feasibility must also be tested. Electrical capacity,
distribution temperatures, available plant space, acoustic constraints,
planning requirements and the building's operating profile can all
influence the appropriate solution.

Selecting a heating or cooling system solely to target an assumed EPC band
can result in unnecessary cost or unintended operational consequences.

What Should Commercial Property Owners Do Now?

1. Review Your Current EPC Portfolio

Record the current rating, issue date, expiry date, assessment level and
available supporting information for each building. Identify planned
sales, lettings, refinancing exercises, construction completions and
refurbishments.

2. Identify Buildings Close to an EPC Trigger

Give early attention to buildings likely to be sold, let, completed or
required to display an EPC around the eventual commencement of the
reformed regime.

3. Retain Accurate Building Information

Keep current drawings, specifications, operation and maintenance manuals,
commissioning information, controls descriptions and evidence of installed
systems.

Where suitable evidence is unavailable, an assessor may have to use
conservative default assumptions. This can affect the calculated result.

4. Test Refurbishment Options Before Committing

Review the likely EPC effect of major fabric, HVAC, lighting and controls
changes before the design is fixed. Testing coordinated improvement
packages is more reliable than assuming that an isolated technology will
produce a target rating.

5. Develop a Portfolio Strategy

Owners of multiple properties should avoid treating each EPC as an
isolated compliance exercise. A portfolio review can identify transaction
deadlines, evidence gaps, higher-risk assets and opportunities to align
improvements with planned capital expenditure.

6. Compare the EPC with Actual Performance

Use metered energy data, building management system information and
operational reviews alongside the EPC. This can help distinguish an asset
rating issue from operational causes such as extended running hours,
simultaneous heating and cooling, poor controls or incomplete
commissioning.

Common Commercial EPC Mistakes to Avoid

• Assuming the existing EPC rating will remain unchanged under the
  reformed methodology
• Treating an EPC as a measurement of actual energy use
• Selecting a heating or cooling system solely to target an EPC band
• Completing improvement works without testing their combined effect
• Failing to retain evidence of installed fabric, lighting, controls and
  building services
• Assuming an EPC recommendation report is a complete decarbonisation or
  investment plan
• Waiting until a sale, letting or completion deadline before appointing
  an assessor

An EPC Is Not the Same as Operational Energy Performance

An EPC provides a standardised assessment of the asset. It does not tell
an owner exactly how much energy the building will consume or what its
annual energy bill will be.

Two buildings with similar EPC ratings can perform very differently in
operation depending on occupancy, operating hours, tenant equipment,
maintenance, commissioning and controls.

KJ Tait therefore considers commercial EPC compliance alongside
operational energy performance. The certificate provides one source of
information, while metered data and engineering investigation explain how
the building is actually performing.

Connecting these two views supports our wider purpose of
Closing the Performance Gap in Buildings.

How KJ Tait Can Help

KJ Tait has CIBSE-accredited Level 5 energy assessors and experienced
building services engineers. We support commercial property owners,
landlords, investors, developers and asset managers across Scotland.

Our commercial EPC services can include:

• Non-domestic EPC assessments and lodgement
• Review of existing EPCs, calculation models and supporting evidence
• Assessment of properties likely to be affected by the transition to the
  reformed regime
• Dynamic simulation modelling for complex commercial buildings
• Scenario testing for proposed fabric, HVAC, lighting, controls and
  renewable energy upgrades
• Costed and sequenced EPC improvement pathways
• Heat decarbonisation and electrical capacity studies
• Portfolio-level EPC and capital investment planning
• Operational energy analysis and building performance evaluation

Our aim is not simply to produce a certificate. We explain what was
assessed, why the building achieved its rating and what practical measures
can be considered next.

Key Takeaways

• Existing commercial EPC requirements continue to apply in Scotland
• The new non-domestic EPC regime is no longer expected to commence in
  late October 2026
• A revised commencement date and associated transition timetable are
  awaited
• The future commercial EPC will include an Energy Performance Rating,
  Energy Use Indicator and Direct Emissions Indicator
• A current rating should not be assumed to transfer directly into the
  reformed system
• An EPC is an asset assessment and does not measure actual operational
  energy consumption
• Owners should review existing EPCs, transaction dates, building evidence
  and planned improvement works now

Discuss Your Commercial EPC Requirements

If you own or manage commercial property in Scotland, KJ Tait can review
your existing EPC position, identify potential transition risks and test
practical improvement options before investment decisions are made.

Contact KJ Tait to discuss an individual commercial EPC assessment or a
coordinated portfolio improvement strategy.