The Essential Guide to SAP Calculations for Your New Build Project

Discover the importance of SAP calculations for new construction projects. Get expert guidance on optimizing design, meeting regulations, and boosting value.

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Designing and constructing a new building is an exciting undertaking.  Today, more than ever, energy efficiency should be a top priority  – not only to comply with building regulations but also to create a building that’s future-proof, cost-effective to run, and attractive to environmentally conscious buyers or tenants.   That’s where SAP calculations for new build projects play a crucial role. Let’s dive into what SAP calculations are, why they matter, and how they can benefit your new construction project.

What are SAP Calculations and Why Do They Matter?

SAP, or Standard Assessment Procedure, provides a structured way to evaluate the energy efficiency of new buildings.

It’s more than a formula; it’s a comprehensive analysis of how your building is designed and equipped to perform.  Let’s break down the key areas SAP calculations scrutinise:

Building Fabric

This encompasses the “shell” of your building.  SAP calculations analyse factors like:

  • Insulation: The types and levels of insulation in walls, roof, and floors have a major impact on heat loss and heat gain.
  • Windows and Doors: The glazing type (single, double, etc.), frame materials, and overall air-tightness significantly influence how much energy is needed for heating or cooling.
  • Thermal Bridging: Areas where heat can easily escape, such as junctions between different construction elements, are also factored in.

Heating, Ventilation, and Cooling (HVAC)

The choice and efficiency of your building’s systems play a major role in energy use. SAP assessments consider:

  • Heating System: The type of boiler, heat pump, or other heat source, along with its efficiency rating.
  • Heating Controls: Smart thermostats, zoning systems, and other controls that optimise heat delivery get attention.
  • Ventilation: The type of ventilation (mechanical or natural) and any heat recovery systems impact the overall energy picture.
  • Air Conditioning: If included, the type of system and its efficiency are crucial factors.


Lighting choices are about more than just aesthetics. SAP calculations examine:

  • Lamp Types: LEDs, fluorescent, or other lighting technologies, each with different energy consumption profiles.
  • Lighting Controls: Sensors, dimmers, and other automated controls that optimise lighting use are taken into account.

Renewable Energy

If you’re incorporating solar panels, heat pumps, or other renewable technologies into your new build, SAP calculations assess the projected energy generation and the resulting reduction in your reliance on grid power.

Additional Considerations in SAP Calculations for New Builds

  • Building Dimensions and Orientation: The building’s size, shape, and how it faces the sun impact solar gains and heat loss.
  • Water Heating: The efficiency of water heating systems for domestic use is factored in.

The SAP Calculation Result: Your EPC

The outcome of all of these SAP calculations is an Energy Performance Certificate (EPC). EPCs rate buildings on a scale of A (most efficient) to G (least efficient).

Consider your EPC as your building’s energy efficiency report card. It provides a standardised and easily understandable snapshot of its environmental performance, making it a valuable tool for several purposes:

EPCs are a critical part of proving that your new build meets the minimum energy efficiency standards set forth in Part L of the Building Regulations.  Without a compliant EPC,  you cannot obtain the necessary building control approvals.

EPCs also allow you to compare the energy efficiency of your building to others of a similar type and size.  This can be helpful for identifying areas for future improvement as technologies evolve and regulations become even more stringent.

Some government programs and utility companies may also offer financial incentives or rebates for new buildings that achieve high EPC ratings. An EPC may be required to qualify for such programs and to maximise the benefits of energy efficiency investments.

Regulations and SAP

In the UK, new buildings must comply with Part L of the Building Regulations, which sets minimum energy efficiency standards. SAP calculations are the official method for proving your design meets these requirements and obtaining the necessary building control approvals.

While regulatory compliance is non-negotiable, SAP calculations for new build projects offer much more than just a pass/fail grade. They empower you to make informed decisions about design features and technologies that will benefit your building for years to come.

Key Benefits of SAP Calculations for New Builds

Optimising Building Design from the Start

SAP calculations for new build projects work best when they’re a part of the design process from its early stages.  By analysing energy performance at the outset, you can explore how factors like building orientation, insulation materials, window glazing, and HVAC system types impact your projected EPC rating and operating costs. This allows you to make efficiency-driven design choices that may be harder or costlier to implement later.

Controlling Ongoing Energy Costs

Buildings with poor energy efficiency are expensive to run. SAP calculations, particularly when done early on, highlight the areas where strategic investments will have the biggest payback in terms of lower energy bills. You can make data-backed decisions about where to spend your budget to maximise long-term savings.

Risk Mitigation

Surprises during construction can be costly and time-consuming.  Integrating SAP calculations into your project workflow helps identify potential compliance issues early in the design stage. This allows your team to make necessary adjustments proactively, minimising the risk of costly redesigns, project delays, or fines associated with non-compliant builds.

Market Appeal

Buyers and tenants are increasingly focused on sustainability, and a high EPC rating can attract those seeking to reduce their energy bills and environmental impact. A favourable EPC gives your building a competitive edge in the market and could potentially lead to a higher sale price or rental income.  It signals your commitment to responsible development.

Environmental Impact

Buildings play a significant role in overall carbon emissions. SAP calculations offer a practical lens for designing a new construction project that minimises environmental impact. By targeting energy efficiency improvements identified by the calculations, you directly contribute to a more sustainable built environment.

How SAP Calculations Work in New Construction

  • Early-Stage Assessment:  An initial SAP calculation, based on your design plans and specifications, provides a preliminary EPC rating and helps you explore different strategies for optimising energy performance.
  • As-Built Assessment:  Upon building completion, a final SAP calculation is required. It takes into account any changes made during the construction process and generates the official EPC used for demonstrating compliance and marketing the property.
  • Working With Your Team:  SAP assessors work closely with your architects, engineers, and contractors to ensure the information used in the calculations aligns with the as-built reality.  This collaborative approach helps ensure a

Choosing the Right SAP Assessor

The quality of your SAP calculations directly impacts the benefits you’ll gain. It’s essential to choose an assessor who isn’t just a technician, but a partner in your project’s success.  Here’s a deeper look at the key qualities to prioritise:


Start by verifying that the assessor is fully accredited under a recognized scheme.  This demonstrates they have undergone training,  possess the knowledge required by the government, and are qualified to perform accurate calculations and generate official EPCs.

New Build Experience

Optimising energy efficiency in new construction requires a specific skill set.  Look for an assessor with a proven track record and a demonstrated understanding of the unique opportunities and challenges of designing brand-new, energy-efficient buildings. They’ll be able to suggest innovative solutions and spot potential issues early.

Consultative Approach

The best SAP assessments go beyond simply generating numbers.   Seek an assessor who takes the time to understand your project’s goals,  clearly explains the implications of different design choices, and provides actionable recommendations tailored to your building.  Effective collaboration with your architect, engineers, and contractors is crucial.

Communication Skills

SAP calculations can get technical. Choose an assessor who is a skilled communicator, able to translate complex concepts into easily understandable terms.  This ensures that you make informed decisions based on a clear grasp of the information provided.

Responsiveness and Efficiency  

Building projects operate on timelines. You need an assessor who is responsive, organised, and aligns with your project schedule.  Ask about typical turnaround times and  processes for providing results and feedback.

Cost vs. Value

While the cost of SAP services is a factor, don’t select an assessor based on price alone.  Consider the long-term value that a skilled assessor brings to the table.  Potential savings on energy bills, avoiding costly redesigns, and a more desirable final building can far outweigh a slightly higher assessor fee.

Focus360: Your Partner in Energy-Efficient New Builds

At Focus360, we have extensive experience in providing SAP calculations for a wide range of new build projects.  Our team understands the unique considerations of designing and constructing energy-efficient buildings in the UK.  We work with you to optimise your project’s sustainability performance, ensuring that it meets the necessary regulations and unlocks the long-term benefits of energy efficiency.

The Power of Informed Decisions

SAP calculations for new build projects are more than just a regulatory requirement; they provide a powerful tool for designing buildings that are environmentally responsible, cost-effective to operate, and attractive to discerning buyers and tenants. By integrating SAP calculations into your project from the outset and partnering with a qualified assessor, you make informed decisions that can pay dividends throughout the entire lifecycle of your building.

Ready to explore how SAP calculations can benefit your new build project? Contact Focus360 today for a consultation. Let’s work together to achieve your energy efficiency goals and create a building that’s both sustainable and successful.

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Post written by: Peal Lemon

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