SAP Calculations for New Build Dwellings

Our highly experienced SAP Assessors provide a friendly and fully supportive service to a host of clients throughout the UK, including Architects, Developers and Builders of all sizes.

As part of our SAP Calculation service we provide all necessary advice or recommendations that may be required to ensure that your project passes Part L1A of the Building Regulations (or local equivalent) in a practical and cost-effective manner.

SAP Assessments for New Build Developments    

All newly constructed residential properties in the UK require an individual new build SAP Calculation to be submitted to the appointed Building Control Body (BCB) before any building work commencing.

Part L1A of the Building Regulations in England and Wales (and other related build standards elsewhere within the UK) requires all new dwellings to achieve stringent annual carbon emissions targets and minimum thermal performance standards. This is demonstrated by undertaking a SAP Assessment which includes a DER/TER Calculation and a DFEE/TFEE check (applicable to England and Wales only).

On completion of a development, an ‘As Built’ SAP Calculation is provided for each completed dwelling, which is also used to generate an On Construction Energy Performance Certificate.

To discuss your SAP Assessments further, please contact us on 0115 7270599. Alternatively please complete the form below to request a FREE quotation.

New Build SAP Calculations: Expert Consultancy    

SAP Calculations for new build residential developments should be completed alongside the detailed design process, once internal layouts have been confirmed, and a provisional or outline build specification is available.

This provides an opportunity to easily adopt any recommended specification changes that may be required to achieve compliance with Part L1A of the Building regulations (or other local equivalent standards).

Once the building works are complete, the design stage SAP calculation is updated to reflect the completed dwelling including any specification or design changes, the final heating, hot water and ventilation systems and the actual measured air permeability rate of the residence as determined by an Air Tightness Test.

SAP Rating and New Build Development Plans

The final ‘As Built’ SAP calculation is issued for submission to the appointed Building Control Body.  It is also used to produce an On Construction Energy Performance Certificate (EPC) for the completed dwelling which is also required by Building Control as part of the sign off procedure, while also being a legal requirement for the subsequent sale let of the dwelling.

For more information relating to SAP Calculations for New Build properties, please explore the Frequently Asked Questions below or those detailed on our general SAP Calculation page.

New Build SAP Calculation – Frequently Asked Questions:

What are the Dwelling Emission Rate (DER) and Target Emission Rate (TER)?

The Target Emission Rate (TER) is a maximum level of annual CO2 emissions that are permitted from a dwelling by Part L1A of the Building Regulations (or equivalent local standard). The TER is calculated within a new build SAP calculation, based upon a notional property of the same size and shape as the proposed dwelling that is built to set of minimum energy performance standards as outlined with the Building Regulations.

The Dwelling Emission Rate (DER) is the actual annual CO2 emission rate of a dwelling as determined by a SAP Calculation based upon the overall proposed build specification of the development.

To comply with Part L1A of the Building Regulations, the calculated DER must not exceed that of the mandatory TER.

What are the Dwelling Fabric Energy Efficiency (FEE) and Target Fabric Energy Efficiency (TFEE) rates?

Part L1A 2013 introduced Dwelling Fabric Energy Efficiency (DFEE) and Target Fabric Energy Efficiency (TFEE) rates to the Building Regulations in England and Wales, as a means of promoting a ‘Fabric First’ approach to achieving overall compliance with the DER/TER requirements of building regulations?

In a similar manner to the TER, the TFEE is calculated within a new build SAP calculation, based on a notional dwelling of the same size and shape as the proposed property that is built to set of minimum energy performance standards as outlined with the Building Regulations.

The DFEE rate is derived from an actual SAP Calculation based upon the overall proposed build specification of the development.

To comply with Part L1A of the Building Regulations, the calculated DFEE must not exceed that of the mandatory TFEE.

What are the notional build standards used to calculated the Target Emission Rate (TER) and Target Fabric Energy Efficiency (TFEE) ?

The TER and TFEE rates are calculated based on a notional dwelling of the same size and shape as the actual proposed dwelling if it is constructed to a concurrent specification.

The concurrent specification is detailed within Table 4 of Section 5.0 of Approved Document Part L1A 2013 and is summarised below:

Table 4: Summary of concurrent notional dwelling specification
Element or system Values

Opening areas (windows and doors)

 

Same as actual dwelling up to a maximum proportion of 25% of total floor area
External walls (including opaque elements of curtain walls) 0.18 W/(m2.K)
Party walls 0.0 W/(m2.K)
Floor 0.13 W/(m2.K)
Roof 0.13 W/(m2.K)
Windows, roof windows, glazed roof-lights and glazed doors

1.40 W/(m2.K)

(whole window U-value)

Opaque doors 1.0 W/(m2.K)
Semi-glazed doors 1.20 W/(m2.K)
Airtightness 5.0 m3/(h.m2)
Linear thermal transmittance Standardised psi values – see SAP 2012 Appendix R, except us of y = 0.05 W/(m2.K) if the default value of y = 0.15 W/(m2.K) is used in the actual dwelling
Ventilation type Natural (with extract fans)
Air-conditioning None
Heating system

Mains gas

If combi boiler in actual dwelling, combi boiler; otherwise regular boiler

Radiators

Room Sealed

Fan flue

SEDBUK 2009 89.5% efficient

Controls

Time and temperature zone control

Weather compensation

Modulating boiler with interlock

Hot water storage system

Heated by boiler (regular or combi as above)

If cylinder specified in actual dwelling, volume of cylinder in actual dwelling

If combi boiler, no cylinder. Otherwise 150 litres.

Located in heated space

Thermostat controlled

Separate time control for space and water heating

Primary pipework Fully insulated
Hot water cylinder loss factor (if specified) Declared loss factor equal or better than 0.85 X (0.2 + 0.051 V2/3) kWh/day
Secondary space heating None
Low-energy lighting 100% Low-energy lighting
Thermal mass parameter (TMP) Medium (TMP = 250)

 

If the above specification is adopted in its entirety, compliance with Part L1A 2013 is guaranteed. It is, however, noted that these details are not prescriptive and may not be the most economically feasible option for all development.  Designers and developers are therefore free to pursue other specifications provided the final DER and DFEE equal or better the TER and TFEE.

What happens if the SAP Calculation fails?

Specification improvements are usually required If a SAP calculation initially fails the minimum energy performance standards of the Building Regulations. At EPS Group, we specialise in working with our clients to devise low cost, practical options to achieving overall compliance with Part L1A (or equivalent local standard). Rest assured, we will work with you to provide options that will guarantee your SAP calculation passes.

How can EPS Group help with SAP Calculations?

There are many reasons to appoint EPS Group to provide your SAP Calculations

How can EPS Group help with SAP Calculations?

At EPS Group, we are interested in forming ongoing partnerships with property professionals and self-builders by offering unrivalled customer support and technical consultation, which can be relied upon.
As part of this commitment, our SAP Calculation service includes all required advice and recommendations to ensure that your project passes with the appropriate Building Regulations in a practical and cost-effective manner.

Don’t let compliance obligations hold you back! Our Energy Consultants and certified Assessors have the experience to understand your challenges, and the expertise to meet them on your behalf.

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Highly Experienced

We complete thousands of new build SAP Calculations each year. You can rest assured that we know how to demonstrate compliance with Part L1A of the building regulations in a cost-effective and practical manner.

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Expedited Service Available

We appreciate that developments move fast. If you require energy calculations or pressure testing urgently, give us a call and we will try our best to help.

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Competitive Pricing

We provide transparent, competitive, all-inclusive fixed fees with significant discounts available for developments with multiple units.

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Fully Accredited Team

Our SAP Assessors are all fully accredited and insured. You can therefore rely on the advice and services that they provide.

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Independent Advice

We only provide energy calculations and testing services. With no materials or products to sell you can be confident that we will aim to provide you with the most economic and feasible solutions to achieving compliance.

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One Stop Solution

From planning to completion we provide an extensive range of complementary services which helps to simplfiy our client’s energy compliance obligations.

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Client Focused

We tailor our services around you and your bespoke requirements. This is not an industry where a one-size fits all approach should be used.

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Ongoing Technical Support

Plans and specification change. We are therefore available to provide technical support throughout the duration of a build in order to prevent any regulatory problems arising at completion.

EPS Group: A Partner for those in the Construction Industry

We value the importance of a solid working relationship with those in the construction industry, and for many, we serve as the reliable go-to-company to entrust from the planning stage of a development through to completion.

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