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March 5, 2026
Joe Averill
10 minutes
If you have looked into sustainable office space in the UK, you have almost certainly come across BREEAM. It is the most widely used green building certification in the country, and increasingly, it is what tenants, investors, and planning authorities expect as standard for commercial property.
But what does BREEAM certification actually involve? How much does it cost? And is it worth pursuing for your building or office fit-out?
This guide covers everything you need to know, from the rating levels and assessment categories to the certification process, costs, and real-world case studies of BREEAM buildings that set the benchmark.
BREEAM stands for Building Research Establishment Environmental Assessment Method. It is the world's oldest green building certification, first launched in 1990 for new office buildings in the UK.
The system was created by the BRE Group (Building Research Establishment), which was originally founded in 1921 as the British government's Building Research Station. BRE was privatised in 1997 and is now owned by the BRE Trust, a registered charity. All profits are reinvested into building science research and education. Their headquarters are in Garston, Hertfordshire.
BREEAM assesses buildings across 10 sustainability categories covering environmental, social, and economic performance. Based on the results, buildings receive a rating from Pass to Outstanding.
The numbers speak for themselves. As of late 2025, BRE reports over 2.9 million registered buildings and more than 1 million certified across 104 countries, with more than 14,000 licensed assessors working globally. Six countries run their own localised versions of the scheme, including Germany, the Netherlands, Norway, Spain, and Sweden.
BREEAM is often compared to LEED (Leadership in Energy and Environmental Design), which was launched in 1998 by the US Green Building Council. The key differences:
BRE's own research suggests BREEAM may be the more demanding standard. Buildings scoring modestly under BREEAM often achieve comparatively higher LEED ratings.
Other certifications worth knowing about include WELL (focused on occupant health, designed to complement BREEAM), NABERS UK (measuring actual operational energy), and DGNB (Germany's system covering environmental, economic, and sociocultural dimensions). For a full comparison, see our green building certifications UK guide.
BREEAM awards ratings on a five-tier scale. Each level represents a specific benchmark against typical UK building stock.
| Rating | Minimum Score | What It Means |
|---|---|---|
| Pass | 30% or above | Top 75% of new non-domestic buildings |
| Good | 45% or above | Top 50% |
| Very Good | 55% or above | Top 25% |
| Excellent | 70% or above | Top 10% (best practice) |
| Outstanding | 85% or above | Less than top 1% (innovator) |
Buildings scoring below 30% are classified as Unclassified and receive no certificate.
Each rating level also requires mandatory minimum standards for specific credits. You cannot simply hit the overall percentage. You also need to meet baseline requirements in areas like energy performance, commissioning, and responsible construction.
Here is what each level looks like in practice.
The entry-level rating. It confirms that a building meets basic sustainability standards above the regulatory minimum. While it does not carry the market cachet of higher ratings, it still demonstrates a commitment to environmental performance beyond the bare legal requirements.
Represents the top half of new UK commercial buildings. This is roughly where about 50% of commercial building submissions land. Good is a solid starting point, particularly for projects with tight budgets or where sustainability was not a primary design driver from the outset.
The top quartile of UK buildings. Very Good has become something of a baseline expectation for quality commercial developments, particularly in cities like London and Manchester. Many landlords target this as a minimum for new office stock.
This is where the real competitive advantage begins. A BREEAM Excellent rating places a building in the top 10% nationally. Achieving it requires a minimum of 4 energy performance credits under Ene 01, a commissioning schedule, a building user guide, and responsible construction practices.
Around 10% of submissions reach Excellent. For office buildings in prime locations, this is increasingly the standard that corporate tenants and institutional investors look for.
The highest BREEAM rating. A BREEAM Outstanding building sits in the top 1% of UK buildings. It demands 6 energy performance credits, 4 energy modelling credits, and a published case study sharing what was learned during the project.
Approximately 1% of submissions achieve Outstanding. These are genuinely exceptional buildings. The construction cost premium is significant (more on that below), but so are the returns.
Up to 10 innovation credits can add a maximum of 10 additional percentage points to the overall score. These are earned through exemplary performance beyond standard benchmarks or formally approved innovative technologies. They can make the difference between a high Excellent and an Outstanding rating.
BREEAM evaluates buildings across 10 categories. Each carries a different weighting, so some categories have more impact on your final score than others.
For a fully fitted UK office under BREEAM New Construction, the weightings break down as follows:
| Category | Weighting | What It Covers |
|---|---|---|
| Energy | 15% | Operational CO2, energy efficiency, sub-metering, low-carbon design |
| Health and Wellbeing | 15% | Daylighting, indoor air quality, thermal comfort, acoustics |
| Materials | 13.5% | Life cycle assessment, responsible sourcing, EPDs |
| Management | 12% | Project briefing, commissioning, handover, aftercare |
| Land Use and Ecology | 10% | Site selection, biodiversity, ecological management |
| Pollution | 10% | Refrigerants, NOx emissions, flood risk, light and noise |
| Transport | 9% | Public transport access, cycling facilities, travel plans |
| Waste | 8.5% | Construction waste, recycling, design for disassembly |
| Water | 7% | Consumption efficiency, leak detection, monitoring |
| Innovation | Up to 10% bonus | Exemplary performance beyond standard benchmarks |
Energy and Health and Wellbeing share the highest weighting at 15% each. This means these two categories have the biggest influence on your overall score. Strategic targeting of high-weighting categories is one of the most cost-effective ways to improve your rating.
The Health and Wellbeing category covers areas that directly affect the people working in the building: visual comfort, air quality (with an IAQ plan mandatory as a prerequisite), thermal comfort, and acoustic performance. If you are interested in how these factors link to employee productivity and satisfaction, see our guide to workplace wellbeing and sustainable offices.
Materials at 13.5% is also worth paying attention to. It includes a mandatory credit for responsible sourcing at every rating level. Under Version 7, this category gets even more emphasis, with Life Cycle Assessment (LCA) required at concept, technical design, and post-construction stages for Outstanding.
Category weightings shift for shell-only and shell-and-core assessments. For shell-only projects, Materials rises to 17.5% and Land Use and Ecology increases to 13%, while Health and Wellbeing drops to 10% since many indoor environment credits do not apply.
BREEAM operates distinct schemes depending on your project type. Understanding which one applies is important, because it affects everything from the credits available to the likely cost.
This is the flagship scheme for brand-new buildings. It covers design through construction across all 10 assessment categories. The current version is V7, mandatory from 30 September 2025 for all new UK registrations. V6/V6.1 registrations close on 27 January 2026.
V7 is BRE's most significant overhaul in years. Key changes include whole-life carbon now sitting at the centre of assessment, restructured energy credits with operational energy prediction benchmarks, and a requirement that Outstanding-rated buildings eliminate all on-site fossil fuel combustion. BRE estimates projects will typically score 3 to 5% lower under V7 compared to V6.
This scheme is specifically designed for existing buildings undergoing improvement works. Its defining feature is a modular four-part structure:
Projects can assess one part, any combination, or all four depending on the scope of works.
Part 4 is the scheme most relevant to office fit-outs and workspace refurbishments. It is triggered when remodelling involves changes to 50% or more of wall coverings, floor coverings, ceiling systems, furniture, or equipment. If you are planning a sustainable office fit-out, this is the BREEAM pathway to consider.
The current RFO version is 2015, with V7 planned for early 2026.
For existing operational buildings regardless of age, BREEAM In-Use assesses actual performance through two parts: Asset Performance and Management Performance. Certificates are valid for three years and renewable.
With over 600,000 In-Use certificates issued globally, it is the most popular BREEAM scheme by volume. It maps directly to 34 GRESB indicators, which makes it useful for ESG reporting and investor communications.
Less than 10% of RFO projects reach Excellent, compared to over 30% of NC projects. This reflects the practical constraints of working within existing building stock. NC requires assessment of the entire building, while RFO can target only the relevant scope. RFO also explicitly addresses landlord/tenant responsibility splits.
The certification process runs parallel to design and construction rather than as a separate sequential activity. Here is how it works, step by step.
Start as early as possible, ideally at RIBA Stage 1 (Feasibility) or Stage 2 (Concept Design). Only the assessor can register the project through BRE's online portal, which locks in the scheme version and assessment criteria.
A pre-assessment typically involves a 2 to 3 hour meeting between the assessor and design team. The goal is to establish a realistic baseline score, identify the most cost-effective credit strategies, and inform decisions about which rating to target. This step is particularly valuable when BREEAM certification is a planning condition.
The assessor prepares an Information Required Schedule detailing the documentation needed for each targeted credit. They then work with the design team to collect evidence over an agreed period. The assessor submits a report to BRE for quality assurance review.
On approval, an Interim (Design Stage) Certificate is issued. This is useful for planning discharge, marketing, and financing, but it is still provisional.
At practical completion, the assessor conducts a site visit (typically 2 to 3 hours) to collect photographic evidence. The design team then has up to 12 weeks to supply as-built documentation including commissioning reports, Energy Performance Certificates, material certifications, waste records, and the Building User Guide.
After BRE's quality assurance review, the Final Certificate is issued. For NC and RFO, this is permanent and does not require renewal.
Credits can be lost between design and post-construction stages if as-built conditions fail to match design commitments. This can result in a lower final rating than the interim certificate suggested. If anything material changes (scheme version, building type, scope, or size), the project cannot proceed to a Post-Construction Review and must be registered as an entirely new assessment.
Costs fall into three categories: BRE fees, assessor/consultant fees, and construction cost uplift.
Registration currently runs approximately 280 to 310 pounds (following a roughly 10% increase in April 2024 and a further 5 to 10% increase from May 2025). Certification and QA fees are based on gross internal floor area and building type.
These vary considerably by project complexity:
These fees are set by individual assessor organisations, not by BRE. Additional specialist consultants for ecology, acoustics, daylight modelling, LCA, and energy modelling can add another 5,000 to 15,000 pounds.
Total soft costs for a mid-sized UK office targeting Excellent typically fall in the 15,000 to 35,000 pound range.
This is the more significant cost consideration. Research by Sweett Group (now AECOM) found the following uplifts:
| Target Rating | Construction Cost Uplift |
|---|---|
| Very Good | 0.04 to 0.2% |
| Excellent | 0.4 to 1.8% |
| Outstanding | 4.8 to 10.1% |
BRE's own studies suggest Excellent typically adds less than 1% to construction costs. Outstanding has a steeper premium, with offices at the higher end at around 9.8%.
Commonly overlooked costs include QA failure charges (introduced May 2025), reverification fees for more than 10 credits, innovation credit application fees, and the administrative burden on design teams.
The assessment process itself typically takes 4 to 6 months, with the overall journey from registration to final certificate spanning 6 months to over a year depending on the construction programme.
The business case for BREEAM-certified offices is strong and backed by recent data.
Knight Frank's hedonic regression study across 2,700+ Central London offices found rental premiums of 3.7% for Very Good, 4.7% for Excellent, and 12.3% for Outstanding. More recent Savills data from Q3 2025 shows BREEAM Excellent or Outstanding buildings achieving rents 27% higher than lower-rated or non-rated stock.
JLL's analysis of 592 Central London investment deals showed BREEAM-certified buildings achieve over 20% higher valuations on average. Knight Frank found an 8 to 18% price premium for green-rated offices.
In Central London, the highest-quality BREEAM-rated stock records vacancy of approximately 1%, versus 27% for the lowest-quality uncertified stock. JLL found that BREEAM Outstanding and Excellent buildings completed between 2013 and 2017 had just 7% vacancy 24 months after completion, compared to 20% for Very Good rated buildings.
An estimated 65% of UK office stock is at risk of stranding by 2030 due to tightening regulations and shifting tenant demands. BREEAM certification helps future-proof assets against this risk.
The World Green Building Council found better indoor air quality delivers productivity improvements of 8 to 11%. Harvard's CogFx study showed workers in green buildings scored 25% higher on cognitive function tests.
Since staff costs represent approximately 90% of total office operating expenditure, even marginal productivity gains are worth far more than the energy savings alone.
The City of London Corporation requires developments to aim for BREEAM Excellent or Outstanding through planning conditions. Manchester was the first UK city to mandate BREEAM assessments. The UK Government Construction Strategy requires all public projects using BREEAM to achieve Excellent.
With EPC and MEES regulations on a trajectory toward EPC B by 2030 to 2035, BREEAM certification aligns with where regulation is heading. And BREEAM In-Use's direct mapping to GRESB indicators simplifies ESG reporting, a factor that 75% of corporate respondents now say has moderate-to-significant influence on real estate decisions.
Only a licensed BREEAM assessor can register and certify your project. Here is how to find one.
The official directory is Green Book Live (greenbooklive.com), run by BRE. You can search by scheme type, organisation, location, and postcode radius. BRE can also be contacted directly at breeam@bregroup.com or +44 (0)333 321 8811.
Assessors must hold a recognised built environment qualification and at least two years of relevant professional experience. They then complete approximately 30 hours of BRE Academy training and pass two invigilated examinations. Full assessor training costs around 2,800 to 3,000 pounds plus VAT.
Licences are held by the company, not the individual, and carry annual fees of approximately 550 pounds. Each building type requires separate qualification, so check your assessor holds the right licence for your project type.
Key factors include:
The assessor you choose matters. A good assessor engaged early will pay for themselves many times over by steering the design team toward credits that are easy to achieve and away from those that are expensive relative to their scoring impact.
These projects illustrate what BREEAM certification looks like at the highest level, and the practical sustainability features that earned their ratings.
Bloomberg's London HQ holds the highest BREEAM score ever recorded for a major office building. Designed by Foster + Partners and completed in 2017, the 1.1 million sq ft building achieved an extraordinary 99.1% under the BREEAM Outstanding scheme.
Key features include:
When completed in 2014, The Edge scored 98.36% under BREEAM-NL, making it the world's highest-scoring BREEAM building at the time. The 40,000 square metre Deloitte headquarters uses 70% less electricity than comparable offices and is actually energy-positive, generating 102% of its own energy needs.
Its 28,000 sensors and smart app manage 1,000 desks for 2,500 employees. KPMG estimated the building delivers 42 million euros in net present value over 20 years through productivity gains, staff retention, and reduced absenteeism.
If you are interested in how energy-efficient building technology can drive these kinds of results, The Edge is the gold standard case study.
Completed in 2013 for the Co-operative Group, One Angel Square held the world record for the highest BREEAM score at the time. The 328,000 sq ft building delivered:
It is powered partly by a biodiesel CHP plant fuelled by rapeseed oil from the Co-op's own farms.
In August 2024, Nova in Oxford became the first UK project to achieve a perfect 100% BREEAM score. The 45,000 sq ft mid-tech and R&D building demonstrates that a perfect score is now genuinely achievable.
Completed in 2023, The Forge earned recognition as the UK's first net-zero carbon commercial building under the UKGBC framework. It also achieved NABERS 5-star and WELL Gold ratings, showing how multiple certifications can complement each other.
BREEAM V7 for New Construction became mandatory in September 2025. It is the most significant update in years and has practical implications for anyone considering certification.
Whole-life carbon now sits at the centre of assessment. Life Cycle Assessment is mandatory for Excellent and required at all three project stages for Outstanding. The Energy category has been restructured with new operational energy prediction benchmarks. Outstanding-rated buildings must eliminate all on-site fossil fuel combustion.
The "Simple Buildings" assessment pathway has been removed. Shell-only projects can no longer achieve Outstanding. And a new digital BREEAM Platform replaces the old Excel-based tools.
For projects already in the pipeline, there is a strategic window. Registrations under V6/V6.1 before January 2026 can still be assessed under the previous, less demanding version.
The BREEAM Refurbishment and Fit-Out V7 update, which is most directly relevant to office fit-out providers, is planned for early 2026.
The UK green building market is valued at around 7.3 billion pounds in 2025 and projected to reach 17.1 billion by 2033. In Central London, 47% of available office space now holds BREEAM Excellent or Outstanding ratings. And 61% of office space acquired in the first half of 2025 carried those top certifications.
The trend is clear. BREEAM certification is moving from competitive advantage to baseline expectation for quality BREEAM office space. Whether you are developing a new BREEAM building, refurbishing an existing property, or looking for a BREEAM certified office for your business, understanding the certification is no longer optional.
For a broader look at how BREEAM fits alongside LEED, WELL, and other standards, see our green building certifications comparison. And if you are exploring certified workspace options, our guide to sustainable coworking spaces can help you find BREEAM-rated flexible offices.
Want to find your next leased, managed or serviced office space to rent? Book a call with our team today.
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