UKGBC’s Retrofit Recommendations for Decarbonising Commercial Buildings

UKGBC calls for immediate action on commercial building energy use

The UK Green Building Council has published new guidance that tells commercial property owners to start with what they already have. According to the organisation, simple changes to existing systems can cut energy use by more than a quarter before any major construction work begins.

Commercial buildings account for 23% of operational carbon emissions from the UK’s built environment. Most of these properties were built before 2000. They will still be standing in 2050, which means retrofit must take priority over demolition if the country is to meet net zero targets.

The guidance arrives as regulatory pressure increases. From 2025, all commercial buildings must hold valid Energy Performance Certificates. The government has proposed a minimum EPC rating of B by 2030, with an intermediate C rating potentially required by 2027. Meeting these standards will require substantial changes to how existing buildings operate.

UKGBC’s recommendations form part of its Advancing Net Zero programme. The organisation first published its framework for commercial retrofits in May 2022. It has since released additional reports covering offices, retail premises, and warehouse facilities. The latest guidance, published in January 2024, focuses specifically on retail and logistics buildings.

Three approaches to reducing commercial building emissions

The guidance distinguishes between three types of intervention. Each offers different levels of energy savings and requires different levels of investment.

Optimisation involves no physical alterations to building fabric. Instead, it focuses on improving how existing heating, cooling, and lighting systems operate. This might mean adjusting control settings, improving maintenance schedules, or correcting system faults. These measures typically cost little or nothing to implement. However, they can deliver energy savings of around 26% when combined with basic upgrades.

Light retrofit covers single-aspect improvements such as LED lighting installation or straightforward heating controls. These interventions usually achieve energy savings of approximately 15%. They require modest capital investment and cause minimal disruption to building occupants.

Deep retrofit involves comprehensive overhauls of building fabric and energy systems. This approach targets energy reductions of between 60% and 65%. Consequently, it requires significant capital expenditure and can cause substantial disruption during implementation.

The UKGBC framework emphasises that optimisation should come first. Many building owners overlook this step and proceed directly to expensive capital projects. As a result, they miss opportunities to achieve substantial savings quickly and cheaply.

New EPC requirements reshape investment priorities

Energy Performance Certificate regulations create clear compliance deadlines for commercial property owners. Buildings that fail to meet minimum standards will face restrictions on new leases and renewals.

The proposed B rating requirement by 2030 represents a substantial challenge. Many existing commercial buildings currently hold D or E ratings. Achieving the necessary improvements will require coordinated action across entire property portfolios.

Retail and warehouse operators face particular pressure. These sectors often operate on tight margins. Energy costs represent a significant proportion of operating expenditure. Therefore, improvements that reduce both emissions and running costs offer clear commercial benefits beyond compliance alone.

Office buildings must accelerate their retrofit programmes substantially. Current projections indicate that the sector needs to achieve a 59% reduction in energy use by 2050. Meeting this target requires doubling the recent pace of office retrofits. Furthermore, changes in working patterns since 2020 have altered how office space is used, which affects the business case for different types of intervention.

Ten considerations for commercial property retrofit projects

UKGBC’s guidance outlines ten key factors that should inform retrofit decisions. These considerations help building owners develop effective strategies that balance cost, disruption, and carbon reduction.

Understanding the building comes first. This means gathering accurate data on current energy use, identifying where waste occurs, and assessing the condition of existing systems. Many buildings lack proper metering and monitoring. Without reliable data, investment decisions rest on guesswork rather than evidence.

Assessing actual needs prevents unnecessary expenditure. Different buildings serve different purposes and operate under different constraints. A warehouse in constant use requires different solutions from a retail unit with variable occupancy patterns. Similarly, listed buildings face restrictions that standard commercial properties do not encounter.

Building the business case requires clear evidence of return on investment. UKGBC provides case study examples that demonstrate how different interventions perform financially. These real-world results help property owners secure internal approval and external financing for retrofit programmes.

Setting energy intensity targets creates measurable goals. Vague commitments to reduce emissions lack the specificity needed to drive action. Instead, organisations should establish clear metrics tied to floor area or operational hours. These targets then inform technology choices and implementation schedules.

Upskilling facilities management teams ensures that improvements deliver lasting benefits. New systems and controls require different maintenance approaches. Staff need training to operate equipment effectively and identify when performance degrades. Otherwise, optimised systems gradually drift back towards inefficient operation.

Energy monitoring must continue after installation. Ongoing measurement identifies problems quickly and verifies that interventions achieve expected savings. Modern monitoring systems can flag issues automatically, which allows rapid response before small problems become expensive failures.

Prioritising retrofit over new construction reduces embodied carbon. Demolition and rebuilding creates substantial emissions from materials and construction processes. Existing buildings already carry this carbon debt. Extending their useful life through retrofit avoids adding new embodied emissions to the atmosphere.

Upgrading building fabric and services requires careful sequencing. Installing efficient heating systems into poorly insulated buildings wastes potential savings. Conversely, improving insulation first allows smaller, cheaper mechanical systems to meet reduced heating and cooling loads. This approach lowers both capital and operating costs.

Integrating low-carbon technologies becomes more feasible once demand falls. Heat pumps and other efficient systems work best when buildings require less energy overall. Therefore, optimisation and fabric improvements should precede major plant replacements wherever possible.

Collaborating across landlord and tenant boundaries removes barriers to action. Split incentives often prevent sensible investments. Landlords who pay for upgrades cannot capture energy bill savings that tenants receive. Green leases and collaborative agreements help align interests so both parties benefit from improvements.

Critical facts about commercial building decarbonisation

• Commercial buildings generate 23% of operational carbon emissions from the UK built environment, making them a priority sector for climate action.
• Most UK commercial properties were constructed before 2000 and will remain in use past 2050, which means retrofit represents the only viable path to decarbonisation for existing stock.
• Optimisation measures can achieve 26% energy savings through controls adjustments and maintenance improvements without physical alterations to buildings.
• Deep retrofit programmes deliver energy reductions between 60% and 65% but require substantial capital investment and cause significant disruption during implementation.
• The government has proposed mandatory EPC ratings of at least B by 2030 for all commercial buildings, with a possible interim C rating requirement by 2027.
• Office sector energy use must fall by 59% before 2050 to align with net zero targets, requiring retrofit programmes to proceed at twice their current pace.
• UKGBC published initial commercial retrofit guidance in May 2022 and released updated sector-specific playbooks for retail and logistics properties in January 2024.

How retail and warehouse properties can reduce emissions

The January 2024 guidance addresses specific challenges facing retail and logistics operators. These sectors share certain characteristics that affect their decarbonisation strategies.

Large floor areas relative to building volume create particular heating and cooling challenges. Warehouses often have high ceilings and limited insulation. Retail premises frequently feature extensive glazing that increases heat gain in summer and heat loss in winter. Both building types typically operate longer hours than standard offices, which extends energy demand across more of each day.

HVAC systems in these buildings often run inefficiently. Controls may operate on fixed schedules that ignore actual occupancy or weather conditions. Heating and cooling sometimes run simultaneously in different zones. Maintenance may focus on avoiding breakdowns rather than optimising performance. These issues create opportunities for quick wins through better system management.

Lighting represents a major energy load in retail and warehouse environments. Both sectors require good visibility for operational and safety reasons. However, many properties still use outdated lighting technology. Switching to LED systems with intelligent controls can halve lighting energy demand while improving light quality.

Electrification of heating and hot water services allows properties to eliminate fossil fuel combustion on site. Heat pumps can replace gas boilers where building fabric improvements have first reduced heat demand. This transition also prepares buildings for an electricity grid that will become progressively cleaner as renewable generation increases.

Renewable energy generation offers opportunities where building design permits. Large roof areas on warehouses suit solar photovoltaic installations. The electricity generated can offset on-site consumption, particularly where operational patterns match solar generation during daylight hours. However, structural surveys must confirm that roofs can support panel weight and wind loading.

The guidance emphasises portfolio-wide approaches rather than building-by-building projects. Retail chains and logistics operators typically manage multiple properties. Standardising retrofit approaches across portfolios reduces costs through bulk purchasing and allows knowledge gained at one site to benefit others. Moreover, portfolio strategies enable organisations to prioritise investments where they will deliver greatest impact.

Iterative programmes spread capital expenditure over time and align improvements with planned maintenance cycles. This approach avoids the disruption and cost of standalone retrofit projects. Instead, each planned intervention becomes an opportunity to incorporate carbon reduction measures. Roof replacements include insulation upgrades. Boiler failures trigger heat pump installations. Lease renewals prompt energy efficiency clauses.

Four steps to unlock building energy savings

UKGBC’s energy optimisation report sets out a practical process for implementing no-cost and low-cost measures. The four-step framework helps building owners achieve rapid results.

Engaging stakeholders brings together everyone affected by energy decisions. This includes building managers, occupants, maintenance contractors, and energy suppliers. Each group holds different information and faces different constraints. For example, facilities teams understand how systems actually operate day-to-day, which often differs from design intent. Occupants know which spaces are too hot, too cold, or poorly lit. Bringing these perspectives together identifies problems that individual stakeholders cannot see alone.

Aligning incentives addresses the split between those who pay for improvements and those who benefit from savings. Traditional commercial leases often leave landlords responsible for capital expenditure while tenants pay energy bills. This arrangement discourages investment because landlords cannot capture returns. Green lease clauses and cost-sharing agreements can overcome this barrier by ensuring both parties gain from reduced consumption.

Using data transforms energy management from reactive to proactive. Smart meters and building management systems generate detailed information about consumption patterns. This data reveals when and where energy gets wasted. It shows whether systems operate as intended or have drifted from optimal settings. It allows building managers to test whether changes deliver expected savings and adjust approaches accordingly.

Acting on findings requires clear ownership and adequate resources. Optimisation measures may cost little to implement, but they still need staff time and attention. Building operators must allocate responsibility for specific actions, set deadlines for completion, and follow up to verify results. Without this discipline, good intentions produce reports rather than carbon reductions.

Yetunde Abdul, Director of Industry Transformation at UKGBC, summarised the guidance purpose directly. The report provides direction to help the industry act now and invest wisely. This framing emphasises urgency while acknowledging that effective action requires careful planning rather than rushed decisions.

We help organisations navigate commercial carbon reduction requirements through practical support programmes. Our approach recognises that businesses face competing demands on capital and management attention. Therefore, we focus on interventions that deliver measurable financial and environmental returns.

What building owners should consider next

Commercial property owners face decisions about where to start their decarbonisation programmes. The UKGBC framework suggests a clear sequence that balances quick wins against long-term needs.

Initial assessment should establish baseline performance. This means gathering 12 months of energy consumption data, reviewing current EPC ratings, and identifying obvious system faults or inefficiencies. Many buildings lack this basic information. Obtaining it requires minimal cost but provides essential evidence for all subsequent decisions.

Quick wins through optimisation should follow immediately. Adjusting heating and cooling schedules, fixing control faults, and improving maintenance practices can begin within weeks of completing the assessment. These measures start reducing both emissions and costs while longer-term projects undergo planning and approval processes.

Medium-term planning should identify which buildings in a portfolio require light retrofit interventions to meet 2027 or 2030 compliance deadlines. This analysis must consider current EPC ratings, remaining lease terms, and planned capital expenditure cycles. Properties furthest from compliance need earliest attention. Buildings approaching major maintenance events offer opportunities to combine necessary repairs with energy improvements.

Long-term strategy must address buildings that will require deep retrofit to achieve net zero operation. These projects need careful financial modelling because they involve substantial capital expenditure. However, delaying them until 2040s makes net zero targets unreachable. Therefore, organisations should identify which properties justify deep retrofit investment and begin planning programmes that spread costs across multiple years.

Skills development deserves early attention because it affects how well all other measures perform. Facilities management teams need training on new technologies and maintenance approaches. Building operators must understand how to interpret monitoring data and respond to system alerts. Procurement teams require knowledge of green lease structures and performance contracting models. Developing these capabilities takes time but determines whether retrofit investments deliver promised returns.

Supply chain engagement becomes increasingly important as programmes scale up. Contractors and equipment suppliers need clear visibility of future demand to invest in necessary capabilities. Early discussions with potential delivery partners help identify capacity constraints and avoid delays when projects reach implementation stage. Additionally, building relationships with specialist contractors often improves both quality and cost outcomes.

Financing options require investigation because internal capital budgets may not stretch to cover all necessary work. Green mortgages, energy performance contracts, and sustainability-linked loans offer alternatives to conventional funding. Each mechanism has different requirements and implications for risk allocation. Understanding what financial markets can offer helps organisations structure programmes to access optimal funding sources.

The SBS net zero programme supports businesses through this planning process. We work with companies to prioritise interventions based on their specific circumstances, regulatory requirements, and financial constraints. Our consultants help translate technical guidance into practical action plans that fit within existing operational and investment cycles.

Additional guidance and official resources

Several authoritative sources provide detailed technical information to support commercial building retrofit programmes.

The UK Green Building Council resource library contains the full commercial retrofit guidance documents, including sector-specific playbooks for offices, retail premises, and logistics facilities. These publications provide detailed case studies showing how different building types have implemented various interventions.

Government EPC requirements for commercial properties explain current and proposed minimum energy efficiency standards. This official guidance clarifies compliance deadlines and sets out the regulatory framework affecting investment decisions.

The UK net zero strategy published by the Department for Energy Security and Net Zero establishes the policy context for building decarbonisation. It outlines government expectations for the commercial property sector and signals potential future regulatory developments.

The Chartered Institution of Building Services Engineers publishes technical guidance on energy efficient design and operation of building systems. Their material helps building managers and contractors implement optimisation and retrofit measures effectively.

Training resources through the SBS Academy help businesses develop internal capabilities for managing energy performance and carbon reduction programmes. These practical courses focus on skills that deliver immediate operational improvements rather than theoretical knowledge.