Energy Performance Certificates for Commercial & Domestic Buildings

Assess Ltd

Tel        0121 453 8332

Mob     07771 662 357

Email   [email protected]

SAP for New Build Homes

In order to obtain your completion certificate you will need to provide Building Control with a copy of your SAP Energy Performance Certificate (SAP EPC) which must have been produced by an accredited On Construction Energy Assessor (SAP Assessor) and lodged on the National Landmark Database.


In order to produce your SAP EPC the primarily function of a SAP Assessment is to confirm that your new building is compliant with Building Regulations Part L1A. (complete our SAP Questionniare)


A SAP Assessment is normally done at both the DESIGN stage and again at the BUILT stage.

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INVOLVE US AT THE DESIGN STAGE and we will work with you throughout your project and provide on-going advice on the options that you may want to consider in order to  ensure that at completion

Part L compliance is acheived as cost-effectively as possible.


Planning and Building Control will require you to ensure that your building will be compliant with Building Regulations Part L1A so Design Stage SAP Calculations and Pre EPC will be required to avoid costly delays and additional works upon completion.




Before you can be issued with your completion certificate you will need to prove to Building Control that your building is compliant with Building Regulations L1A by providing a lodged SAP EPC Certificate, SAP Reports and Calculations and Part L1A Compliance Report.


We can provide all the documentation that will be requried by Planning and Building Control and offer EARLY ADVICE and SPECIFIC RECOMMENDATIONS on any potential non compliance issues so please get in touch as soon as possible.

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In addition to calculating the U-Values for the Fabric of the dwelling we need to consider the efficiency of the HVAC services (Heating, Ventilation & Air Conditioning) and can offer you practical advice in ensuring that these contribute to the overall ratings rather than purely meeting minimum requirements.

Best advice to ensure a compliant and speedy SAP ASSESSMENT


Fill in our SAP Questionnaire THOROUGHLY ... Most delays are caused because of missing information that we need to complete your assessment. Everything we need (pretty much) is requested on our SAP Questionnaire so completing it thoroughly will certainly save time (naturally no need to repeat information already contained on your drawings and specifications).


BE SPECIFIC ... concerning your fabric constructions, we need to understand the type and thickness of each material that you have used and specific insulation types (eg - 'Celotex GA4000' not just 'Celotex')


USE ACD DETAILING ... Accredited Construction Details allow us to use improved figures within our calculations for the thermal perfomance of your junctions. It is highly recommended that you use them (... contact us to find out more).

It's not only NEW BUILD DWELLINGS that require SAP Assessment you will also require a SAP EPC for highly glazed EXTENSIONS, Barn CONVERSIONS, COMMERCIAL to DOMESTIC conversions and

SINGLE to MULTIPLE dwellings (flats & appartments).


Existing Domestic EPC's and Commercial EPC's are produced using software that relies on many 'assumed' values (RdSAP & SBEM) however there are instances when calculated U-Values can give a far more accurate and representitive calculation for the property.


ONLY SAP ASSESSORS  /  On Construction DEA's

are qualified to produce U-Value calculations.


EPC Assess are quaified and accredited :-


On Construction Domestic Energy Assessors ( OCDEA / SAP ASSESSORS )

Non Domestic Energy Assessors ( NDEA / Commercial Assessors )

Domestic Energy Assessors ( DEA )

Green Deal Assessors - Domestic & Commercial ( GDA / NDGDA )


... so can provide Energy Performance Certificates for (virtually) ANY PROPERTY TYPE and have years of experience working with architects, designers, builders, contractors large and small on thousands of standard and not-so-standard developments across the UK. We are happy to share our knowledge and do what we can to ensure your projects easily acheives compliance however EARLY INVOLVEMENT is CRITICAL if we are to guide you in the most cost effective way.

Opening like windows & doors generally lose more energy than the surrounding building fabric however glazing can provide useful Solar Gains that can be used to compensate for the losses providing they do not cause summer overheating, we can ensure that an optimum balance is achieved to ensure compliance.

It's never too early to get us involved and we are happy to be as involved as you would like us to be and hope our experience a cross a range of building types will allow us to be of service no matter what your next project entails.




  ... so we can help you with what you have planned for tomorrow !

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Please contact us on the form below and let us know more about your project, you can attach drawings if you would like specific advice or information and we'll be happy to call you back at your convenience :-



In order to achieve compliance with Building Regulations Part L1A there are three seperate 'layers' of targets to acheive which cannot be done by using only the minimum fabric u-values indicated. 


Minimum Fabric U-values requirements are clearly stated in Part L1A, these are minimum values for walls, floor, roof, windows and doors, these must be achieved and we produce U value Calculations to varify this.

(SAP U-value calculations are only valid if produced by an accredited SAP Assessor you cannot rely upon calculations produced by any other means)


Target Fabric Energy Efficiency (TFEE) is the target for all of the individual fabric U-values working together and is individual to every property so needs to be calculated, it is lower than the sum of the minimum fabric u-values which means that some of the individual fabric u-values that you have achieved need to be better than the minimum values allowed in Part L1A.


Target Emission Rate (TER) is the target for the overall CO2 emissions from the property and measures the fabric efficiency in addition to the efficiency of the water and space heating systems and air-tightness of the building, it is individual to each property and is derived from the calculations and information provided by you.


(there are also specific minimum requirements for heating controls, lighting efficiency and water consumption specified within Part L1A which may also apply according to your building type)



SCALED DRAWINGS including floor-plans, elevations, sections and site layout.


HEATING/COOLING specifications of space and water heating systems, ventillation and any low-carbon technologies (LZC)


CONSTRUCTION SPECIFICATIONS walls, floors, roof, windows and doors including any Accredited Construction Details (ACD) used.


We may also send you our SAP QUESTIONNAIRE to collect any outstanding information that we require (you can send these documents to us electronically or in printed format).


It is important that you provide as much information as possible otherwise we are required to use DEFAULT inputs which tend to be 'worse case scenario' and can contribute to issues of non compliance.


Once we have collected all of your information we will 'model' your data within our software and initially produce a Part L1A Checklist to ensure that your building is compliant with the appropriate Building Regulations.


If compliant we can produce your U-value and SAP Reports in addition to your Pre or Lodged EPC. However if  there are any areas of non compliance we will provide specific recommendations that you can consider in order to rectify this along with further copies of the compliance checklist to prove that implementing these changes will acheive compliance.


Your final SAP EPC can only be lodged at completion and if it is compliant with Building Regulations Part L.

Service and Documents Provided


Design Stage SAP Assessment:-

U-value Reports

SAP Reports (DER/TER/DFEE/TFEE, Overheating)

Part L1A Compliance Checklist



Built Stage SAP Assessment:-

U-value Reports

SAP Reports (DER/TER/DFEE/TFEE, Overheating)

Part L1A Compliance Report

Lodged SAP EPC


SAP EPC & Reports

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