Perhaps because I have been rather critical of the government’s Green Deal policy (see here) and expected very little useful, that I ended up being pleasantly surprised with a Green Deal assessment, though it is not entirely without its teething problems.
I signed up for an assessment as part of Haringey’s free assessment offer *. Maybe I simply got lucky with a knowledgable assessor, assigned on behalf of Make My Home Green, or perhaps I know more than most householders so I asked the right questions and heard the right things. Nevertheless I thought I should share my experience and the process - as it is an interesting - and ongoing journey which has raised several issues.
* DECC provided funding for 580 assessments in Haringey for a cost of £150,000 —> so around £250 per assessment. Similar arrangements exist in other boroughs.
Green Deal Assessment
Impressively, it only took 1 week from my phone call to an assessor knocking on my door, with confirmation prior to email. I was also emailed Green Deal Information Pack and asked to give some basic information such as what the age of the property is; whether any improvements have already been made or whether the property is in a conservation area/listed etc.
The entire visit took 2 hours, and the assessor was conscious that it did not take longer; not so much for her time spent, but she said it was also related to intrusion in someone’ s home.
Firstly, the assessor appeared knowledgable and dedicated. She clearly explained what information she would require and the process of her assessment. The assessor explained in plain language that the assessment would be based on some measurements taken; bills provided and checking of boiler specification and wall build up as well as a more specific occupancy assessment. She clarified that the output is based on an EPC (using RdSAP) and the Green Deal recommendations, which will recommend eligible measures, will be based on this tool.
The assessor explained that the next step would be getting in touch with a Green Deal provider to get quotes for these measures, but she then advised that the Green Deal Plan could be used for improvements even if not funded through the Green Deal providers: “you may decide a Green Deal provider is not appropriate for you or you may be able to finance improvements in other ways, but the Green Deal plan should still give you an idea of priorities and payback”.
The assessor also recommended visiting SuperHomes during their open days to gain a sense of what is possible and what certain interventions may look like and to hear first-hand how they are experienced by occupants.
The assessor then proceeded to take measurements in the property, such as dimensions, wall depths, checking loft insulation etc. Once this was done, the assessor needed 30 minutes or so to do the EPC there and then. I was then asked to give occupancy specific information (such as how often we take baths/showers; what our washing machine washing temperature is (30ºC since you ask); what our typical central heating schedule is during the week and weekend etc).
I liked that the EPC and Green Deal Recommendations are then discussed there and then, and what the eligible measures are; which may be fully funded under a Green Deal Finance plan (and which ones would require partial up-front payment), as well as the impact of our occupancy patterns (in our case being ‘below average energy users’) and any energy savings based on today’s prices.
I was surprised that our property was put in the D-rating (and not much lower) as aside from some loft insulation, basic airtightness measures, double glazing and an efficient gas-condensing boiler, there are no other efficiency measures. I think this does not reflect the actual efficiency of our property, but highlights shortcomings of EPC ratings. An example Green Deal EPC ratings can be viewed below and downloaded here.
Fabric and occupancy assumptions
The assessment did rely on the occupant being aware of the house history (for example age of windows for the assessor to then derive an assumed performance), which lots of people will not know if interventions were undertaken by others before they lived there. In any case, assumptions of performance are assumed; and has to be based on evidence: i.e. if no access to the loft is possible, no insulation is assumed as it cannot be verified; despite the owner being able to state what it is. Adjustments were made to our 250 mm loft insulation due to lots of cardboard boxes on top and compacting it and the EPC input was reduced to 100 mm loft insulation by the assessor. Equally, where DIY wall-insulation is installed, and the assessor cannot gauge the depth of insulation or its kind (and no Part L certificate would exist to prove its existence and performance), it will not be used in the EPC. While this ofcourse makes sense; ignoring certain improvements may overestimate the potential for further improvements and jeopordise the golden rule and actual payback. While Green Deal ‘in-use factors’ will be applied to proposed interventions, this will probably only partly protect consumers from over-estimating potential energy-savings (and are presumably there to reflect a gap of performance between predicted and actual energy savings, not for ignored or unverifiable improvements?).
Also, where no room or house thermostat (as in our case), input assumption is that occupants heat to 21ºC heating before and after any intervention. This may be useful for future high energy users, but again may overestimate actual behaviour. Many existing houses do not have thermostats and on cold days, many will not be able to heat spaces to 21C (or may not want to) - so this is again a big assumption to make. The assessor did mention comfort-taking however and that this could be a reason why actual savings may not be met.
Access to energy bills
Finally, in the email and in the Green Deal Assessment booking phone call, I was asked if I had access to latest energy bills or if I knew the yearly energy usage. I take note each year of our yearly energy usage, and had not dug out my bills, but gave the kWh/m2/year and cost associated with it. However, this was not accepted: I needed to provide evidence for this and ended up having to go through bills to find the latest. This should have been made much clearer; also that the latest quaterly bill is not good enough; but it needs to be a full year’s worth of data, and most recent. I do wonder whether this means people who have just moved in can therefore not apply for a Green Deal Plan?
The EPC is still based on the predicted standard occupancy, and the Occupancy Assessment then is adjusted with additional information provided, presumably also using the actual energy use derived from energy bills.
This is Sofie's blog; or rather a collection of musings & articles sometimes also published elsewhere. More about Sofie here.