Originally Posted by aloooof
Apologies if this is off topic, but any ballpark ideas on what it may cost to get a D or E rated house up to B rating? I know it's "how long is a piece of string" territory, but any info you have would be much appreciated. (We're at the beginning of a process of renovation and don't know where to start, so all advice greatly accepted....)
The first place to start is to understand the difference between the following 2 questions:
1. do you want to get a better BER on paper (say from E to B)?
2. do you want to make a cold house affordably comfortable?
On question 1, you can spend quite a lot of money "upgrading" the house so that, on paper, it will be a "B" rated house but in reality it performs like a "D" and cools down rapidly as soon as the heating is turned off for example. The main reason for this underperformance is the over-reliance on box ticking and not enough effort going into understanding the reason on why the house was cold in the first place. Also, toooooo much emphasis on insulation but only paying lip service to airtightness/ventilation.
On question 2, you first need to understand what is going on in the house by testing/surveying it for the 3 forms of heat transfer. Only after this testing is complete should intelligent and targeted upgrade measures be taken which, in general, can have little to do with major insulation or heating upgrades.
I recommend anyone starting out on a renovation to consider these two questions.