The EPC survey is an `Evidence Based Non-
The major reason for the EPC is to determine how much CO2 is pumped into the atmosphere by the property, measured in tonnage per annum. The recommendations on the report are designed to improve the energy efficiency of the property and reduce the buildings CO2 output, so the government can show European Parliament in 2020 they have met their obligations. However because of BREXIT the future is unclear for Domestic EPCs?
The assessor will need to establish certain information from you, which will result in a more accurate report IE: Accurate age of the main property, dates of any extension or conversions, such as lofts or garages [the calculation engine software will default to what building control was at the time of the different build dates] are there any renewable's installed. Any types of heat recovery systems etc, etc.
The assessor will inform you that they will have some work to do outside of the property. They will then work out the gross internal or external cubic meterage of the shell of the build per floor level. All of the heat loss perimeters will be calculated in linear meterage. Inspect the loft for insulation thickness. Boilers, heating controls, glazing, bulbs etc, plus much more data is taken into consideration. Each assessor will have their own sequence and methods of working; the end result should be the same?
The time taken to collect all of the information will depend on the complexity of design, maybe the size? Any extensions or roof rooms or a section of the property which has been converted, such as an integral garage which may well be thermally different, if built at different times. The assessor may do their calculations at the property or back at their office. The majority of properties are completed within the hour [be suspicious of an assessor who is only there a matter of minutes] the mean average time is about 45 minutes but this does as stated earlier depend on design complexity, extensions, size etc. We allow approximately 1 hour for a combined EPC & Floor-
Where a room in the roof is applicable such as a loft conversion, a property with dormers, half dormer properties, attic/loft conversions etc: Please provide the date of the conversion [if applicable] any evidence you may have on the `U` values for the Residual area, Stud walls, Slope and Flat Ceiling area [these would have been provided by your SAP assessor for building control] Please click here for further explanation.This will override the defaults in the calculation engine and provide a more accurate report. If you have additional evidence for `U` values on certain parts of your property please provide, as this will improve the accuracy of the report IE: Floor Insulation, Wall Insulation [internal, external, cavity fill or all 3 combined]Roof Insulation, Glazing U & G values.
If you have any type of wall insulation which is retro fitted, cavity or solid wall and is not visible please make sure the paperwork or any certificates are available for evidence [assessors are unable to identify the drill pattern with back filled mortar if rendered on cavity walling] If solid walls apply, have they had any internal/external insulation or dry lining to the heat loss walling.
If your double glazing was fitted post 2002 please make sure any evidence is provided. Sometimes the date is visible on the glazing bar in the units. An error by customers [as they would not know] is that sometimes a single glazed unit creates the heat loss perimeter, such as a front door which leads to an unheated double glazed porch. Customers would be under the impression the house is fully double glazed, however for EPC data/accuracy the property is not. If the porch was heated however, then the house would become fully double glazed [there is other criteria which also affects this]
Light fittings. Assessors now have to do a bulb count, how many are low energy as opposed to how many are not. This is something to not be concerned about as the difference with 2 identical properties, 1 with 100% low energy bulbs and the other property to have none, is only 1 or 2 RDSAP points on the scale, but this extra 1 or 2 points could take you into the next banding.
Loft insulation. If this can’t be seen and measured [because of boarded over]or no access is available, assessors can only input the data as unknown. Please have any evidence of loft insulation thickness installed available, if not then the assessor will establish the thickness known as MWA, mean weighted average and round down the thickness.
HWC [hot water cylinder] the more insulation around the cylinder including thermostats, the better the rating.
Boiler information, if applicable. The assessor will need to establish the make & model of the boiler if possible. Please have the make & model available just in case the assessor is unable to identify. The correct data for the boiler will result in a more accurate report.
Heating controls. If wirelesses please make sure they are available as can be easily missed. Depending on the type of heating controls, they can make a considerable difference to the rating in your favour, especially zoning of areas/floor levels with time and temperature zone controls.
If evidence is provided after the report is lodged with Landmark a number of options are available. When LODGED the EPC at this point becomes a legal document in a PDF format which can’t be changed as the epc is encrypted with its own unique 24 digit reference number which is only applicable to that property and is available to view on the public register.
1. Provide the evidence along with a dated signed letter from the property owner, stating no further changes have been made to the property, a fee will apply [this is time sensitive] as a new report has to be created and lodged with Landmark, after the original has been cancelled.
3. A complete survey of the property which will outdate the previous report. Full cost of survey will apply.
Annexe: When is an EPC required for an annexe?
A property can have an additional building unit (e.g.an annexe’) which, if it is self-
The annexe may share a party wall(s) with the main dwelling. Standalone buildings (i.e. physically separate from the main building) With a total useful floor area of less than 50m2 does not require an EPC.
A building unit designed or altered for separate, self-
If there is a separate part of the dwelling which is not self-
Standard occupancy is an important concept in energy rating because, in order to provide a means by which readers of an EPC can compare one property with another, a level playing field must first be achieved. For example, you might inspect a five-
RDSAP works by measuring the annual cost of maintaining an acceptable temperature regime in a dwelling. The assumption is that an acceptable regime would be achieved by heating the property to 21 degrees Celsius in the lounge and 18 degrees Celsius in other habitable rooms for 9 hours per week day and 16 hours at weekends.
The calculation uses the size of the property to estimate a suitable average number of occupants and hence the hot water requirements for that number of occupants. This method is sometimes referred to as an ‘asset rating’.
As this is a legal document, all data, site notes, photographs, evidence etc has to be kept as a hard copy, on file as evidence for 15 years. Currently residential EPCs are valid for 10 years; however it may be in the property owner’s interest if the energy efficiency has been improved to create a new EPC, if they are selling or renting.
When payment is received the EPC report is normally forwarded within 48 to 72 hours after the surveyor has visited, assuming the property is registered with Landmark.
We are providers of Energy Performance Certificates in Bath and the surrounding areas. If you have any questions or queries about our EPC service, please contact us to discuss, where we will be only too pleased to help and offer advice.
If the annexe is not self-
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