
SAP Calculations
For Extensions to Dwellings
SAP Calculations are needed for residential new builds, extensions, or conversions, ensuring compliance with building regulations and optimising energy use. Essentially, it's the compass guiding builders, architects, and developers towards constructing sustainable, eco-friendly homes for a greener future. Get your SAP Calculation UK today with Energy Ready.
Unlimited Revisions
SAP Pass Guarantee!
No booking fees
Free cancelation policy
Stay ahead of building control requirements
Free 'As Designed' EPC with every survey
Unlimited revisions on your design until you get your SAP pass

Accredited Assessors
Local - Nationwide Coverage
Prices From only £90

EPCs & SAP Calculations
Speedy Turnaround
It's simple to get a SAP Calculation for extensions
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Send over all your construction drawings, plans and designs for water and space heating as well as lighting.
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Your assessor will build your design in the latest efficiency modelling software.
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You'll receive a detailed review of your design highlighting all the factors building control are looking for!
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If your design needs more work Energy Ready will work with you to ensure a pass with free unlimited revisions to your design!

Straight Forward SAP Calculations
Extension
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Dedicated, fully qualified assessor
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Unlimited recalculations to get the building to a pass
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Expert knowledge - fully accredited
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Experienced in navigating SAP Calculation Building Regulations
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Free As designed EPC ​
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EPC and free Energy Report with every order
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3 day SAP calculation turnaround upon receiving all information
Get even more insight with the Energy Ready Blog...

SAP Calculations for Extensions:
Ensure Energy Efficiency and Part L Compliance
Why Your Home Extension Needs a SAP Calculation
When you plan a home extension, it's easy to focus on the design and aesthetics, but have you considered how your extension will affect your home’s overall energy efficiency or comfort? SAP calculations for extensions are a legal requirement under Part L of the Building Regulations and help ensure that your new extension meets the same energy efficiency standards as the rest of your home.
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A SAP calculation for an extension measures the energy performance of your new space, ensuring that it complies with regulations designed to reduce carbon emissions and energy consumption. Without this SAP calculation, your extension will not pass Building Control inspections, which could result in significant delays and additional costs. Our SAP calculation UK service for extensions guarantees that your new space is energy-efficient and fully compliant with all legal requirements.
There's more than one way to prove compliance
Building control allow for multiple ways to prove compliance. As well as meeting the u-value requirements for all the fabric elements you can prove compliance by:
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The Glazing Allowance Method
Ensuring the total area of windows, roof windows, rooflights and doors in extensions do not exceed the sum of the following.
i. 25% of the floor area of the extension.
ii. The total area of any windows and doors which no longer exist or are no longer exposed due to the extension.
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Energy Ready can calculate and provide confirmation of compliance with a SAP Calculation for Building Control.
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The Whole Dwelling Method
In a lot of modern extensions the designs have a preference for more glazing than the glazing allowance method offers. In these cases Energy Ready can prove compliance by showing that the overall CO2 Emissions Rate of the EXISTING house combined with the PROPOSED extension is no greater than the EXISTING house combined with a NOTIONAL extension built to the limiting glazing allowance and fabric standards of the building regulations.
EXISTING DWELLING + PROPOSED EXTENSION CO2 EMMISSIONS
EXISTING DWELLING + NOTIONAL EXTENSION CO2 EMMISSIONS
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Energy Ready offers free unlimited revisions to your design to ensure you can demonstrate compliance to building control. Choose Energy Ready today for a SAP Calculation for your extension.
BONUS!
An Accurate SAP Calculation Improves Your Extension's Value and Comfort
An energy-efficient extension not only meets legal requirements but also enhances the comfort and value of your home. A well-insulated extension with an efficient heating system will stay warmer in the winter and cooler in the summer, making it a more comfortable living space. Additionally, a higher energy performance calculation for an extension can lower energy bills, making your home more attractive to future buyers.
We specialise in providing detailed and accurate Thermal Performance Assessments for Extensions, helping you achieve an optimal SAP rating. By identifying areas where insulation, heating, or other energy systems can be improved, we ensure that your extension is both energy-efficient and cost-effective.
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What Does a SAP Calculation for an Extension Involve?
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A SAP calculation for an extension looks at several factors to determine how energy-efficient your extension will be. The calculation considers elements such as:
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The U-values of walls, roofs, and windows, which measure how well these elements retain heat.
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The type of heating system installed in the extension.
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How much natural light the extension receives (affecting heating and lighting needs).
For large extensions or those with a significant thermal performance impact, a SAP calculation will ensure that your extension doesn't negatively affect the overall energy performance of your home. A SAP Rating for Residential Extension is essential for demonstrating compliance with Part L and obtaining a completion certificate from Building Control.​​​​
Put your money into your extension NOT energy bills!

SAP Calculations UK
Find Us All Over East Anglia and Beyond!
Ipswich
Woodbridge
Felixstowe
Colchester
Chelmsford
Thetford
Norwich
Bury St Edmunds
Cambridge

Benefits of a SAP Calculation with Energy Ready?
Working with Energy Ready has several advantages for builders, architects, and developers. Here are the key benefits of SAP calculations in the UK:
Ensures Regulatory Compliance
Ensures your new build design complies with SAP Calculation UK building regulations. All our assessors are fully qualified.
Improves
Sustainability
Promotes sustainable building practices by evaluating the environmental impact.
Better Building
Energy Efficiency
Ensures the new build meets energy efficiency standards, reducing energy consumption and costs for your end customer
Enhances
Property Value

Boosts property marketability and value by ensuring high energy performance. A high rating is an attractive selling point to potential buyers or renters.
Identify Cost Saving Opportunities
Identifies cost-saving opportunities in the design phase by giving you insights to optimise energy use.
Forecast your 'As Built' Energy Efficiency
Provides precise predictions on energy performance, aiding in better decision-making during construction.
Our promise to you...
Speedy Turnaround
When we receive the go ahead you become our priority. We aim to turnaround within 3 days of receiving all the plans.
Competitive Prices


We review all our prices regularly so you get the very best value for your money and with FREE as designed EPCs for every SAP calculation we are hard to beat!
Transparent Process
No hidden fees, no sudden invoices, no confusing jargon, no extra waiting time. We work with you to get the result you need in line with SAP calculations for Building Regulations Part L.


Open & Easy Dialogue
Our goal is to help you achieve yours. From start to finish no question is off limits, we want you to be completely satisfied and confident in the energy efficiency of your project after working with us.
Get even more with the Energy Ready blog pages....
Expert insight into the world of Buildings Energy Efficiency
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Why do I need a Commercial EPC?Acommercial energy certificate is required by law when a non-residential property is constructed, sold, rented, or modified. It helps property owners, tenants, and buyers understand the energy efficiency of a building and identify opportunities for improvement to reduce energy costs and environmental impact.
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How is the energy efficiency of a commercial property assessed?The energy efficiency of an EPC for commercial propertyis assessed based on various factors, including heating systems, lighting, insulation, and the overall energy usage of the building. Our certified assessors conduct a detailed evaluation to provide an accurate rating.
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How long does it take to get an EPC Commercial property?Once we conduct the site visit, we aim to turn around your EPC within 5 days. The process involves a thorough assessment followed by the generation of the EPC report.
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What are the benefits of having a Commercial EPC?Having anEPC for Commercial premiseshelps you comply with legal requirements, reduce energy consumption, lower utility bills, and improve your property's marketability. It also provides valuable insights into enhancing the building's energy efficiency.
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What happens if my commercial property does not have an EPC?If your commercial property does not have an EPC when required, you could face legal penalties and fines. It's important to ensure your property is compliant to avoid any legal complications.
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How much does a Commercial EPC cost?The cost of a Commercial EPC varies based on the size and complexity of the property. We offer competitive pricing and have reviewed our prices for 2024 to provide the best value for your money. Contact us for a detailed quote.
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What types of properties require a Commercial EPC?EPCcommercialare required for all non-residential buildings, including offices, retail spaces, industrial units, and more. If you are constructing, selling, renting, or modifying a commercial property, you will need an EPC.
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How often do I need to renew my Commercial EPC?A Commercial EPC is valid for 10 years. After this period, you will need to obtain a new certificate to ensure your property remains compliant with current energy efficiency standards.
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What is included in the EPC assessment report?The EPC assessment report includes your property's energy efficiency rating, detailed findings from the assessment, and recommendations for improving energy efficiency. It provides a comprehensive overview of your building's energy performance.
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Do I need an EPC if I am only renting part of my commercial property?Yes, an EPC is required for any part of a non-residential building that is being sold, rented, or modified. Each self-contained unit within a commercial property must have its own EPC.
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Are there any exemptions to the EPC requirement?Certain buildings, such as temporary structures, places of worship, and standalone buildings with a total floor area of less than 50 square meters, may be exempt from needing an EPC. Contact us to determine if your property qualifies for an exemption.