How to improve your EPC Rating

Domestic EPC Rating

Domestic EPC Rating

It’s a legal requirement for all domestic properties in the UK to have an Energy Performance Certificate (EPC) in location prior to a property is sold or rented out.

All EPCs should be issued by an accredited Energy Assessor.

This article describes what the Energy Assessor is searching at when they carry out an EPC inspection, and at what easy measures you are able to take to ensure your property gets the very best feasible rating.

In an EPC survey the Surveyor / Energy Assessor will probably be searching at five main elements as follows:

  • How the property is constructed
  • How the space is heated
  • How the water is heated
  • How the property is lighted
  • What ventilation systems are in place

The Energy Assessor will collect data about all these elements; this data will then be fed into a piece of pc software program which will generate the EPC. The methodology utilized by the software program to produce the EPC is the Decreased Information Regular Assessment Procedure (RDSAP). RDSAP is a simplified version of the more rigorous Regular Assessment Procedure (SAP) which, together with the Simplified Building Energy Model (SBEM) is utilized for producing commercial and new develop EPC. The simplified RDSAP methodology was chosen for domestic EPC production because the complexity of the other two methodologies outcomes in the surveys costing much more to produce, something which was regarded as to be acceptable for the commercial market but not for domestic properties.

At, we have access to both RDSAP as well as SAP methodologies as we carry out both Domestic and Commercial EPC work.

The RDSAP process entails the software program making a series of assumptions in location of gathered data. This makes domestic EPC easier and quicker to produce, decreasing the cost for landlords / vendors and consequently helping to increase compliance. This is all nicely and good, but does come at a cost, as the use of assumption in location of gathered data can result in some properties being given an arbitrary energy rating that does not properly reflect the buildings performance.

Nevertheless, Commercial properties are more complex by nature. There may be various parts of the property being utilized for various purpose. Various parts of the exact same property might have various heating requirements. And so on. And an Energy Assessor needs to invest more time examining the property as well as finding its history.

On top of the EPC software program making assumptions the Energy Assessor might need to make some assumptions themselves when carrying out an EPC survey. When this occurs they are obliged to usually assume the worst; for example when a light fitting is discovered to be empty they will usually need to assume that when the bulb is replaced it’ll be with an incandescent bulb instead of a low energy one.

There are a number of low cost measures the owner of a property can take to ensure that their building gets the very best energy rating feasible.


The first and most essential thing to do would be to make sure that the assessor can get access to all the parts of the property they have to inspect in the EPC survey, as any assumptions they are forced to create are likely to result in a worse EPC rating. For example if it’s not feasible for the assessor to access the loft region, either because the hatch is locked or access through under eves storage cupboards is blocked by stuff, then the assessor will need to assume no insulation is present. The exact same applies for the hot water cylinder, if the Energy Assessor can’t open the cupboard to see the cylinder then it’ll be assumed it has no insulation.

Have documentation ready:

If your property, or any part of it has been converted because 1996 then the Energy Assessor will probably be able to enter the date of conversion as the construction date for that element in the EPC, but only in the event you can show them the building regulations sign off sheet, otherwise the construction date will probably be entered as the exact same as the main buildings original construction date, resulting in a worse EPC rating.

Insulate your water tank:

As part of the EPC inspection the Energy Assessor will look at how nicely insulated your hot water tank is. Most tanks have 25mm of foam insulation or a jacket. Hot water cylinder jackets are cheap to purchase, and adding an additional one, or putting one on over the foam insulation will make a noticeable distinction to your EPC rating.

Remove portable heaters:

If whilst carrying out the EPC inspection the assessor finds any portable electric or propane heaters in the property then they will be entered as a secondary heating method. In most instances this will result in your property getting a lower energy rating, as they are likely to be a less effective means of heating than your properties primary heat source. If you remove these heaters then only the primary heart source will probably be taken into consideration.

Change coal for wood:

If you have a fire location in your property then this will be entered in the EPC as either a coal or a wood heater. The Energy Assessor will make an assumption about what you burn in the fire based on what they see at the time of the inspection. If there is no visual evidence as to what fuel you use they will be forced to assume it’s coal, as this gives a worse rating than using wood. It’s consequently advisable to remove your coal scuttle, and replace it having a wood basket.

Block up unused flues:

Any open flue will result in a lower EPC rating, as they will be letting the heat rise out of your property. It’s consequently advisable to block off any unused flues. This may be as easy as stuffing some spare loft insulation up there.

Low Energy Bulbs:

If you have any light fittings with missing bulbs then fit them with low energy light bulbs. It’s not suggested to go around replacing all of your incandescent bulbs with low energy units, but rather just to replace them as the old ones burn out. Whilst low energy bulbs do have an effect on the EPC rating, it’s only a small one. For example, changing all the bulbs in a four bedroom hose from incandescent would make about a 2% distinction to the properties EPC rating. Whilst this is only a small improvement, it’s feasible that it could make the distinction to your rating if you are on the borderline between, for example, an E or a D rating.

Obviously there are lots of more costly measures you could take to improve your EPC rating, such as replacing your boiler having a band A boiler, increasing your loft insulation and filling your cavity walls. Nevertheless in the event you follow the above guidance then you will have carried out every thing feasible to cheaply and effortlessly improve your EPC rating prior to the Energy Assessor visits



  1. says:

    How to improve your EPC Rating | Domestic EPC…

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