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SAP ratings for New Dwellings at Design Stage

The Standard Assessment Procedure (SAP), revised in April 2006, is used to determine the energy efficiency of a dwelling. SAP ratings range from 1 to 100 and the higher the SAP score, the more energy efficient the property.

SAP ratings are based on the energy costs for space and water heating. They establish a means for both the home owner and purchaser to understand the running costs and environmental impact or carbon footprint of the property. 

With continuing rises in fuel costs these constitute strong selling and marketing points for all homes. 

The SAP rating is a legal requirement enforced by the government through building control and applied to all new dwellings.

The SAP calculation establishes the domestic compliance with the Building Regulations Approved Document Part L, the Conservation of Fuel and Power. 

It is an integral part of the government's aim to reduce carbon dioxide emissions in line with the Kyoto Agreement.

To be comparable for all properties, the SAP rating is adjusted to floor area, so that it is essentially independent of dwelling size. It takes into account the following range of factors, which contribute to energy consumption:

bulletThermal insulation of the building fabric
bulletEfficiency and control of the heating system
bulletVentilation characteristics of the dwelling
bulletSolar gain characteristics of the dwelling
bulletThe fuel used for space and water heating

 For access to the official SAP 2005 document click here.

Five steps to compliance:

1. Predicted CO2 should be no greater than target emissions (TER v DER)

2. Check performance is no worse than minimum standards.

3. Check no excessive overheating in summer.

4. Check actual construction performance complies with Part L.

5. Provide efficient operation and maintenance instructions.

 

Energy Performance of Buildings Directive (EPBD)

 

Article 7 " .... when buildings are constructed, sold or rented out, an energy performance certificate is made available to the owner or by the owner to the prospective buyer or tenant ...."

 

Article 10 "the certification of buildings ... are carried out in an independent manner by qualified and/or accredited experts ..."

Compliance with the Building Regulations may be split down into the following groups of project:

New build design assessments

In seeking compliance with Part L (England/Wales), Part J (Scotland), or Part F (Northern Ireland) we use the Elmhurst Design System. 

This system produces a Target Emission Rate (TER), SAP rating, Carbon Index Rating, elemental and u-value calculation reports. 

The calculation establishes the relationship between the Target Emission Rate (TER) and the Dwelling Emission Rate (DER). The design must equal or better the target figure to comply. Both figures are based on the carbon dioxide emission rate for the building.

A Compliance Report for submission to Building Control is produced indicating whether it has passed or failed. Design amendments will be necessary where the initial specification does not meet the required standards. We can often assist designers in meeting the criteria, particularly with large or unusually designed buildings.

A PEA is also produced at this time. This is a Predicted Energy Assessment, based on the SAP calculations and will be required where a dwelling is marketed "off plan".

Many local authorities are now requiring a "renewable energy" element in the design. Again we can produce comparable calculations to prove this.

SAP 2005 has various parts, an energy efficiency rating (the SAP), Environmental Impact Rating, and several other sections, to demonstrate compliance with the relevant section of the Building Regulations Approved Document Part L1A 2006 for new dwellings.

It is also an alternative method to give more design flexibility for Refurbishment, Conversions and Extensions covered by the Building Regulations Approved Document L1B 2006 for Existing Dwellings.

Our assessments are undertaken by an accredited Elmhurst Energy Systems assessor using software approved by the BRE. All our systems are automatically upgraded as legislation changes.

In addition to the Building Regulation Compliance calculations required at the design stage, from 6 April, 2008  EPCs will be required on construction for all new dwellings.

The EPC has to be produced by a licensed and accredited assessor and we will be providing this service from 6 April, 2008.

Where we have carried out the design calculations, the EPC will be produced at a reduced rate on completion of the dwelling.

 

New Build EPC

 

Extensions to Dwellings

Two separate Energy Rating reports, one on the existing dwelling with a notional compliant extension and a second on the existing dwelling with extension as proposed and any improvements to the existing dwelling.

Details on the existing dwelling will be required including dimensioned plans, elevations and the heating specification.

Our reports are not a specification or design for the works and need to be read in conjunction with the construction drawings / specification and heating specification.

An Energy Rating report to compare the Target CO2 Emission Rate (TER) and the Design CO2 Emission Rate (DER) for the proposed dwelling, together with other criteria to assist in demonstrating compliance with the Approved Documents L1A 2006.

Advice is available on improvements required to either obtain compliance with the Building Regulations or improving the overall energy efficiency of the dwelling.

Refurbishments and Conversions

Two separate Energy Rating reports are required, one on the existing dwelling with a notional compliant extension and a second on the existing dwelling with extension as proposed and any improvements to the existing dwelling.

Details on the existing dwelling will be required including plans, elevations and heating specification.

Our reports are not a specification or design for the works and need to be read in conjunction with the construction drawings / specification and heating specification.

An Energy Rating report to compare the Target CO2 Emission Rate (TER) and the Design CO2 Emission Rate (DER) for the proposed dwelling, together with other criteria to assist in demonstrating compliance with the Approved Documents L1A 2006.

Advice is available on improvements required to either obtain compliance with the Building Regulations or improving the overall energy efficiency of the dwelling.

This is an option to provide more design flexibility and to allow for the use of any renewable energy sources within the design.

It should be considered that although an Energy Ratings may not be required to demonstrate compliance with the building regulations, one will be required to enable an Energy Performance Certificate to be prepared for displaying within the completed dwelling.

Our assessments are undertaken by an accredited Elmhurst Energy Systems assessor with software approved by the BRE.

There is an option to provide more design flexibility, especially when the opening areas exceed 25% of the floor area of the proposed extension and to allow for the use of any renewable energy sources within the design.

The purposes of which is to indicate that the Design CO2 Emission Rate (DER) from the proposed enlarged dwelling is not greater than that of the existing dwelling with a notional complaint extension of the same size and shape.

Non-domestic buildings Click here

For commercial and industrial properties a different methodology has to be used. This is called SBEM.

 

Fees:

SAP 2005 Regs (Post 6th April 2006) 

  per dwelling type/unit/calculation
   
DESIGN STAGE  
Initial design calculation and Building Regulation Compliance Certificate & PEA (Predicted Energy Assessment) - per calculation. £   85.00 + VAT
Amendments to achieve compliance £   45.00 + VAT
Conversion calculations - per calculation, per unit £   85.00 + VAT
Extension calculations - per calculation £   85.00 + VAT
Copies of calculation data £   25.00 + VAT
   
New Build EPC - we are licensed assessors and can produce your energy performance certificate.  

 

Economical - Fast Turnaround - Friendly Service

Discounts are available on larger sites and major projects.

Please include payment with order, unless you have a credit account with us.

Credit accounts are available, subject to status, to firms requiring calculations with a fee total of £1,000 + per month.

Nationwide service - England & Wales, Scotland and Northern Ireland regulations

As well as paper drawings, we can accept fully dimensioned files in pdf, dwg, and dxf formats.

 

Need extra plan copies? Want to go "Paperless"?

See our PrintShop for details of our printing, scanning and archiving services

Click Here

 

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Last modified: October 10, 2008