Standards and reporting
NABERS UK
NABERS UK is most useful when the office, rating boundary and actual operational energy evidence are clear, with targets kept separate from achieved results.
What does NABERS UK measure?
NABERS UK measures and rates actual in-use energy performance of offices, with a separate Design for Performance route for new developments or major refurbishments programme owner design-route fact sheet.
Module 01 / 04
Asset
Identify the office and its rating purpose.
Module 02 / 04
Boundary
Agree the relevant rating type and coverage.
Module 03 / 04
Evidence
Prepare actual operational energy information.
Module 04 / 04
Claim
Distinguish a target from an awarded rating.
Read the detailed guidance and evidence
The programme owner distinguishes measured performance from design-based ratings, so an efficient design does not by itself establish the office’s achieved NABERS UK result NABERS UK overview.
The UK scheme’s office focus should not be expanded to every building type merely because the Australian programme offers a wider range of ratings UK administrator scope.
This guide follows fictional Dalesford House through a landlord-and-tenant energy evidence review, without calculating an invented star rating or claiming the building is certified.
The standards homepage keeps operational asset performance separate from corporate reporting and broader building sustainability certification.
Which question belongs to which route?
Identify whether the task is an operational rating or delivery towards a future operational target.
| Decision | Evidence to examine | Interpretation |
|---|---|---|
| Existing office | Actual in-use energy performance | Prepare the relevant evidence with the assessor. |
| New development | A target under Design for Performance | Keep the future target distinct from an achieved result. |
| Major refurbishment | The proposed works and relevant route | Confirm the actual scheme and project situation. |
| Other building type | A request concerning a non-office asset | Do not assume UK scope from Australian programme examples. |
Read the detailed guidance and evidence
Our editorial routing screen does not replace the current scheme documents or an assessor’s determination of the actual rating scope.
Who administers NABERS UK now?
The programme owner identifies CIBSE as administrator, with CIBSE Certification responsible for day-to-day scheme operations programme governance administrator overview.
Module 01 / 04
Programme
Check the NABERS owner source.
Module 02 / 04
Administrator
Use current CIBSE scheme information.
Module 03 / 04
History
Treat older BRE references as historical.
Module 04 / 04
Assessor
Confirm the relevant qualified assessment role.
Read the detailed guidance and evidence
NABERS announced CIBSE’s appointment in April 2024, replacing BRE, and CIBSE issued its own announcement of that transition owner appointment notice administrator announcement.
The November 2020 launch announcement remains useful for the scheme’s origin and measured-energy purpose, but its original administrator description is historical launch announcement.
A source page can contain stale background text alongside current governance information, so the commissioning team should resolve the conflict using the dated appointment notice and current owner description.
This guide does not claim a stakeholder count, a provider accreditation or a current service credential that has not been established from the relevant evidence.
Which rating boundary is the team discussing?
CIBSE identifies Base Buildings, Whole Building and Tenancy ratings in the UK office suite, so the chosen type needs to be explicit rating suite.
| Decision | Evidence to examine | Interpretation |
|---|---|---|
| Base-building question | Landlord-related office operation and the selected scheme boundary | Ask the assessor to establish the actual included energy. |
| Whole-building question | The office as represented by that rating type | Do not silently present a partial dataset as complete. |
| Tenancy question | The relevant tenant scope | Keep its evidence separate from a landlord-only claim. |
| Mixed or shared services | Meters or systems serving more than the assumed office scope | Resolve the allocation through the applicable scheme process. |
Read the detailed guidance and evidence
A familiar billing arrangement is not automatically the rating boundary, so a landlord invoice should be investigated rather than accepted as the complete energy population.
What does Dalesford’s meter case reveal?
Fictional Dalesford House has a main electricity account, tenant information and a separately billed shared-service supply that the first data request missed.
Module 01 / 04
Register
Identify physical supplies and meters.
Module 02 / 04
Account
Connect bills to the correct supply.
Module 03 / 04
Scope
Check which services and areas are represented.
Module 04 / 04
Gap
Resolve missing or overlapping information.
Read the detailed guidance and evidence
The building manager initially sends the main account and assumes that everything needed for the intended rating is included, while the facilities engineer identifies another supply serving shared systems.
Our suggested review connects the meter and account records to the actual building services and asks the assessor which information belongs in the selected rating.
That is an evidence-population issue, not proof that the office has poor energy performance or that a particular star rating will follow.
The ESG data collection guide supports source ownership and missing-data handling, while scheme-specific boundary decisions remain with the relevant rating process.
How should an original arithmetic check be used?
The following invented values illustrate a source reconciliation, not the NABERS rating calculation or its official energy boundary.
| Decision | Evidence to examine | Interpretation |
|---|---|---|
| Main account | 180 MWh recorded in the fictional source file | Confirm the supply, period and evidence. |
| Additional supply | 20 MWh on a separate shared-service account | Investigate its relationship to the selected rating scope. |
| Collected information | 180 plus 20 equals 200 MWh before scope decisions | The sum describes collected records, not an accepted rating input. |
| Possible overlap | A tenant record may refer to energy already in another account | Resolve duplication rather than add every file automatically. |
Read the detailed guidance and evidence
The useful result is a reconciled evidence population whose included energy can be reviewed under the applicable scheme rather than a premature star estimate.
What makes operational energy evidence usable?
A measured-performance task needs the team to understand where each record came from and what it covers, rather than substitute a design estimate for unavailable operational evidence actual-energy purpose.
Module 01 / 04
Period
Identify the dates represented.
Module 02 / 04
Supply
Connect quantities to the actual meter or account.
Module 03 / 04
Change
Explain altered operation or metering.
Module 04 / 04
Limitation
Keep missing or estimated information visible.
Read the detailed guidance and evidence
Dalesford’s manager asks contributors to identify whether a quantity is taken from a bill, a meter record or an estimate, and refers uncertain information to the assessor rather than inventing a complete dataset.
The team also preserves the evidence of a changed supply arrangement so a later comparison is not mistaken for a physical efficiency improvement caused by the building systems.
Our preparation fields are editorial advice and do not introduce a universal data-acceptance threshold, weather adjustment formula or rating validity period.
A sustainability software pilot can demonstrate the supply reconciliation and exception trail without promising to replace the actual scheme assessment.
What should the assessor’s preparation brief make clear?
The parties should agree the scope of the information request before launching a broad collection exercise.
| Decision | Evidence to examine | Interpretation |
|---|---|---|
| Rating purpose | The actual office and type of rating sought | Clarify the boundary rather than infer it from ownership. |
| Energy population | Supplies, meters, shared services and relevant accounts | Identify expected sources and possible overlap. |
| Operational context | Known changes relevant to the source records | Keep interpretation attached to the actual office situation. |
| Open matters | Missing information and unresolved treatment questions | Assign the next decision rather than hide a gap. |
Read the detailed guidance and evidence
A sustainability consultancy engagement can specify evidence coordination while keeping the qualified rating role and conclusion separately identified.
How is a Design for Performance target different from a rating?
CIBSE’s fact sheet describes a target of at least four stars and a process leading to an energy rating after operation, rather than an award based only on the design target Design for Performance fact sheet.
Module 01 / 04
Commitment
Identify the signed project target and scope.
Module 02 / 04
Design
Consider how the building is expected to operate.
Module 03 / 04
Delivery
Keep the target visible through the supply chain.
Module 04 / 04
Operation
Obtain the evidence for the actual result.
Read the detailed guidance and evidence
A developer’s announcement that it targets a NABERS UK result is therefore a different statement from saying the occupied building has achieved that result.
The launch announcement describes targeting a rating at design stage and verifying performance when occupied, which explains the intended connection across the delivery process scheme launch explanation.
Dalesford’s fictional owner keeps the design aspiration in its project history while making any later operational claim from the actual awarded result and its scope.
This guide does not infer that signing an agreement guarantees the target or that an adviser can sell a particular achieved rating.
Which claim matches the evidence available?
Keep aspirations, analysis and actual outcomes distinguishable to investors and occupiers.
| Decision | Evidence to examine | Interpretation |
|---|---|---|
| Target set | The project’s actual Design for Performance commitment | Describe the target and project stage. |
| Model completed | A design analysis and its assumptions | Do not present predicted performance as a measured result. |
| Evidence collected | An operational data package awaiting assessment | Do not turn upload completion into an awarded rating. |
| Rating awarded | The actual result and its stated scope | Communicate the achieved rating accurately. |
Read the detailed guidance and evidence
The BREEAM certification guide explains another asset assessment whose targets and completed outcomes also need clear status labels.
How does NABERS UK relate to other sustainability evidence?
An office energy rating is not a complete whole-life carbon assessment or a broad sustainability certification, even where the project uses the same operational records.
Module 01 / 04
Energy rating
Measured performance under the selected office scheme.
Module 02 / 04
Carbon assessment
A separate calculation with its own modules and assumptions.
Module 03 / 04
Asset certification
A broader scheme and its applicable criteria.
Module 04 / 04
Corporate reporting
The reporting entity and information requested.
Read the detailed guidance and evidence
RICS distinguishes operational energy-related carbon from wider embodied and whole-life carbon, making it important not to call a strong office energy rating a complete asset-carbon result carbon definitions.
BRE describes BREEAM across multiple sustainability categories, while NABERS UK’s owner describes measured office energy, so neither result should be casually substituted for the other BREEAM scope NABERS UK scope.
The embodied-carbon guide addresses the asset’s material-related boundary, and SECR and UK SRS explains why corporate reporting has its own scope and output.
Dalesford gives each recipient the actual evidence requested rather than rely on one rating logo as a universal sustainability answer.
What happens when the rating is used in a portfolio assessment?
GRESB’s 2026 assessment has a separate energy-ratings indicator and recognised-scheme list, which makes the portfolio reporting task distinct from obtaining a rating BC2 scheme list.
| Decision | Evidence to examine | Interpretation |
|---|---|---|
| Scheme recognition | Check the relevant GRESB scheme list | Recognition is not a new NABERS assessment result. |
| Asset record | Connect the actual office rating to the asset | Do not extend one result to unrelated buildings. |
| Status | Use the rating actually awarded under the requested conditions | A target is not the same evidence as an achieved rating. |
| Portfolio treatment | Follow the assessment’s own coverage and evidence instructions | Do not infer a portfolio score from the star level alone. |
Read the detailed guidance and evidence
This guide does not promise a GRESB score, treat recognition as legal compliance or import a future assessment edition into the stated 2026 task.
What should the building team retain after the rating work?
The next manager needs the actual rating scope and source context so the result remains understandable after a staff or service-provider change.
Module 01 / 04
Outcome
Keep the actual result and represented office scope.
Module 02 / 04
Sources
Preserve the relevant account and meter references.
Module 03 / 04
Exceptions
Retain accepted treatment of unusual sources.
Module 04 / 04
Next review
Identify changes needing the appropriate technical advice.
Read the detailed guidance and evidence
Dalesford’s handover records how the additional supply was resolved, preventing the next manager from returning to the incomplete main-account-only file.
The team also preserves the distinction between the earlier design target and the measured outcome, so later marketing does not mix two different statuses.
Our editorial handover supports continuity without inventing scheme retention periods, mandatory reassessment dates or an unverified provider credential.
How can the team organise the work?
This is an original editorial preparation sequence, not a prescribed conformity checklist or a substitute for the selected assessment method.
- 101
Identify the office
Confirm the actual asset and intended rating purpose. - 202
Select the route
Distinguish operational rating from Design for Performance. - 303
Confirm the boundary
Agree the rating type with the appropriate assessor. - 404
Map sources
List supplies, meters, accounts and shared services. - 505
Collect evidence
Preserve operational quantities and source context. - 606
Reconcile the file
Investigate gaps, estimates and duplicate records. - 707
Complete assessment
Use the actual scheme process and qualified roles. - 808
Check communications
Separate target, prediction and awarded outcome. - 909
Hand over the result
Retain scope, evidence and resolved exceptions for the next owner.
Frequently asked
Questions people ask
What does NABERS UK rate?
It rates actual in-use energy performance of offices in the UK.
Who administers the scheme?
The owner identifies CIBSE, with CIBSE Certification responsible for day-to-day operation.
Does BRE still administer NABERS UK?
No, the owner announced CIBSE’s appointment in April 2024, replacing BRE.
Is a design target an achieved rating?
No, Design for Performance targets the later operational outcome rather than awarding it immediately.
Does a rating cover embodied carbon too?
Do not infer that; the scheme concerns office energy performance, while embodied carbon has a separate asset-assessment boundary.
Can a target alone be used as a portfolio energy rating?
Check the portfolio assessment’s actual evidence and status conditions rather than substitute a target for an awarded result.
Sources
Primary sources
Primary provisions and official owner guidance checked on 26 October 2026; historical and draft resources are labelled in the guide.
- NABERSNABERS UK: programme owner
- NABERSCIBSE appointed UK administrator: April 2024
- NABERSNABERS UK launch: November 2020
- CIBSE CertificationAbout NABERS UK
- CIBSE CertificationDesign for Performance fact sheet
- CIBSECIBSE announcement of administrator appointment
- GRESB2026 Real Estate Assessment: BC2 energy ratings
- GRESB2026 Real Estate Assessment: recognised schemes
- BREHow BREEAM works
- RICSWhole life carbon assessment: second edition Version 3