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ABBE Level 3 Diploma in Domestic Green Deal Advice 4. RdSAP & the Green Deal. Presented by. What are EPCs and What is RdSAP ? Changes to RdSAP 9.91 Green Deal Measures and PAS 2030 Golden Rule & Typical Repayments. What are EPCs? What is RdSAP?. Energy Performance Certificates (EPCs).

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abbe level 3 diploma in domestic green deal advice 4 rdsap the green deal

ABBE Level 3 Diploma in Domestic Green Deal Advice4. RdSAP & the Green Deal

Presented by

What are EPCs and What is RdSAP?

Changes to RdSAP9.91

Green Deal Measures and PAS 2030

Golden Rule &Typical Repayments

energy performance certificates epcs
Energy Performance Certificates (EPCs)


Used to assess the energy performance of buildings.

Were introduced in England and Wales on 1st August 2007 as part of Home Information Packs (HIPs). When the requirement for HIPs was removed in May 2010, the requirement for EPCs continued.

A certificate isvalid for 10 yearsand is required on a new tenancy, sale or rental.

Currently the Green Deal measures are only valid for 3 years.

There is no validity time limit on the Occupancy Assessment once lodged. The OA must be lodged within 14 days

role of the epc
Role of the EPC

EPC is required by law when a building is built, sold or put up for rent. Any landlord or homeowner who needs to provide an EPC will need to contact an accredited domestic energy assessor. They will carry out the assessment and produce the certificate.

It is the benchmark of the property’s energy efficiency.

The EPC generates the measures that the GDA will attempt to fit into the Golden Rule framework after the Occupancy Assessment.

what is rdsap
What is RdSAP?

Reduced Data Standard Assessment Procedure (RdSAP) has been developed by the Government for use in existing dwellings, based on a site survey of the property.

RdSAP consists of a system of data collection together with defaults and inference procedures, which generate a complete set of input data for the SAP calculation.

Stroma has created an integrated RdSAP, Green Deal software solution for EPC and Occupancy assessment

rdsap considerations
Property age/detachment, any extensions present

Habitable room count

Dimensions (areas and heat loss perimeters)


Wall construction (plus any insulation)

Floor construction (plus any insulation)

Floor exposure

Alternative wall (plus any insulation)

Roof construction (plus any insulation)

Roof room construction (plus any insulation)

RdSAP Considerations
  • Windows (glazing type, percentage glazed, area)
  • Fireplace count
  • Terrain type
  • Low energy lights
  • PV (could include orientation, pitch etc.)
  • Space cooling
  • Mechanical ventilation
  • Wind turbines
  • Main heating system
  • 2nd Main heating system (optional)
  • Heating controls
  • Secondary heating
  • Hot water heating
  • Gas and electric meters
rdsap assumptions
RdSAP Assumptions

The EPC is designed so an EPC for one property can be a compared with another.

Different people use their house and its contents in different ways. EPCs are therefore not specific to the occupants, but to the dwelling itself.

Assumptions are made by RdSAP so household behaviour does not impact on the EPC rating:

  • Standard occupancy – the actual number of occupants is not accounted for. RdSAP assumes occupancy based on the floor area. This information is then used to determine factors like domestic hot water requirement.
  • Standard heating pattern – some people have their heating set to 25oc all day every day, some people have their heating on for half an hour a day. To avoid this type of behaviour skewing EPC data, a standard heating pattern is used as follows:
    • 9 hours heating a day during the week.
    • 16 hours a day at the weekend.
    • The living area is heated to 21oc and the rest of the house to 18oc.
    • RdSAP does not account for energy use by electrical appliances and non-fitted lighting. It is assumed these will not be left at the property by the current owner/occupier.
differences between sap and rdsap


Used for new dwellings.

Used for buildings which have undergone a ‘change of use’.

Report produced off plan. Property is not visited.

Uses a more comprehensive methodology.

Assessor must hold Dip OCDEA qualification.

Report based on U-values.

Uses SAP software.


Used for existing dwellings.

Assessment conducted at the dwelling.

Uses a reduced methodology taken from SAP.

Assessor must hold DipDEA qualification.

Report based on assumptions.

Uses RdSAP Software.

Differences between SAP and RdSAP
product characteristic data file pcdf
Product Characteristic Data File (PCDF)

RdSAP draws information from databases within the PCDF.

Databases are regularly maintained for DEAs to:

Locate appropriately calculated seasonal efficiencies and characteristics for heating and related products.

Reduce the risk of miscalculation and confusion with data.

The PCDF stores data in separate tables per product, specific fields aid product identification for the technical data relevant to SAP calculations for:

(i) boilers, fired by gas, LPG or oil.

(ii) solid fuel boilers, fired by a variety of solid fuels.

(iii) cooker boilers with twin burners, fired by gas, LPG or oil.

(iv) micro-cogen (also known as micro-CHP), fired by gas, LPG, oil or solid fuel.

(v) flue gas heat recovery systems (FGHRS).

(vi) mechanical ventilation systems.

(vii) waste water heat recovery systems (WWHRS).

(viii) heat pumps.

new data entry
New Data Entry

Draught proofing

Wall thickness measurements

External door count/insulated door count

Number of rooms with bath and/or shower (for waste water heat recovery)

Internal dry lining (yes or no option)

Solar water heating - now giving the option to enter details such as the heat loss coefficient and aperture

Photovoltaics- now has the provision for three separate PV systems

Partially Insulated roof rooms - software now accommodates gable and stud walls, as well as flat ceilings and sloping parts

Areas and U-values can now be specified

Window data extended - orientation, U and g-values taken into account

2 wind turbines can now be considered

Flue gas heat recovery - software contains a new database to provide this data

Waste water heat recovery – software contains a new database to provide this data

new epc includes data entry
New EPC (includes Data Entry)

Green Deal is now the main focus on the first page of the new EPC.


Previous EPC

Recommendations were separated into lower and higher cost measures. In this format, there is no correlation between the measure and its relevance to the home owner.

New Green Deal EPC

The RdSAP 9.91 software shall calculate improvement measures in the order they should be considered. The rating after improvement is a cumulative rating.

The calculation will also determine if the measure is eligible for Green Deal finance.

validity of the epc
Validity of the EPC

The EPC is valid for Green Deal if:

It has been lodged to landmark and is valid as per the requirements of EPBD in the relevant country.

It has been produced after 1st April 2012 (in England and Wales) or after 1st October 2012 (in Scotland).

The GDA is satisfied that there have been no major changes to the property since it was lodged that would materially affect the outcome of the EPC.

the golden rule












The Golden Rule

The Golden Rule says:

“the annual saving in energy cost from implementing the improvement measure must be at least equal to the annual repayments”.

green deal repayments
Green Deal Repayments


R- is the annual repayment

C - is the cost of the measure (using the middle of the range where cost is given as a range)

r - is the annual interest rate (currently 7%)

n- is the repayment term, taken as lifetime of the measure in years

green deal repayments1
Green Deal Repayments

Example: C is £500, r is 7%, n is 20 years = £47

The Golden Rule is met if the calculated annual saving for the measure is £47 or more. Round both R and the annual saving to the nearest £ before comparing them.

RdSAP software calculates this for each recommended measure and passes the result (i.e. no tick, orange tick or green tick) to the EPC register in the lodgement XML.

As an exception to the above, solid wall insulation gets a green tick. This is because a subsidy may be available via ECO (Energy Company Obligation) that reduces the cost to the householder to that available from GD finance.

green deal repayments2












Green Deal Repayments
  • High energy cost before Green Deal
  • Low energy cost after Green Deal
  • Low installation cost of measure
  • Short repayment term
  • Low interest rate
green deal finance
Green Deal Finance

 The Golden Rule is the principle, which limits the amount of Green Deal finance that a provider can attach to the energy meter to the estimated energy bill savings that are likely to result from the installation of measures under the Green Deal plan.

The new bill payments have to be equal to or less than the Green Deal Repayment + New Energy Cost.

This principle aims to keep the energy bills at the property no higher than they would have been had the property been without a Green Deal – this is important both to protect consumers from higher energy bills, and to protect investors from a higher risk of default on the bill.

green deal finance pays
Green Deal Finance: PAYS

The ‘Pay As You Save’ Model

green deal finance savings
Green Deal Finance: Savings

Small 3 bedroom semi detached house:

£3,000 Double glazing

£2,700 Condensing Combination Boiler with Heating Controls

£1,000 Floor Insulation

£1,000 Cavity Wall Fill, Loft Insulation, Draft Excluders

£7,700 Subtotal

£2,559 Interest over 10 Years at 6%

£10,259 Grand Total

£10,580 Savings over 10 years using RDSAP assumptions

(The golden rule applies)

£1,058.00 per annum overall savings

£32 per annum immediate savings

green investment bank
Green Investment Bank

“Britain needs to invest around 200 billion pounds by 2020 in greener technologies to meet ambitious carbon emissions cut targets”

The Green Investment Bank is designed to accelerate private sector investment in the UK’s transition to a green economy. Offshore wind power generation, commercial and industrial waste processing and recycling, energy from waste generation, non-domestic energy efficiency and support for the Green Deal will be the first priority sectors for the Bank, subject to approval by the European Commission.

The bank will initially get £775m towards the £3bn total funding due to come from the Treasury.

Its key role is to raise up to £15bn in private sector funding, from pension funds, foreign sovereign wealth funds, energy companies and banks, by underwriting the initial losses and risks from new and untested green technologies.

The Green Investment Bank commenced lending in April 2012.

green deal finance company
Green Deal Finance Company

The Green Deal Finance Company (GDFC) is working alongside the Green Investment Bank to access private sector funding.

Future Green Deal Providers - the companies that will make energy efficiency improvements – will need to access the cheapest possible underlying source of finance.

If finance is not set at affordable interest rates, it will be more difficult to meet the Golden Rule.

The GDFC intends to:

Minimise the operating and administration costs of the Green Deal, accessing the cheapest sources of finance in the market at the highest possible credit rating.

Maintain a consistent finance rate to all providers regardless of size.


Green Deal Providers can uplift the whole charge by 2% a year, in line with Bank of England inflation targets if desired.

This will allow more Green Deal plans to meet the golden rule and for a greater proportion of these plans to be paid using Green Deal finance by capitalising on some of the expected increase in savings over the course of the plan and potentially decreasing the need for an upfront payment.

There are two options for the repayments. Both are fixed repayment plans, but one is flat and the other rises by 2% each year.


Web Links


Stroma Certification Ltd.

4 Pioneer Way, Castleford, WF10 5QU

0845 621 11 11