Victorian ‘EnerPHit’ EWI monitoring

It’s been 3 winters since the works to the rear of the house were completed and the annual saving on the heating bill has been around £100 as predicted.  An average (less eco minded) homeowner might see this figure double so let’s say £200 pa.  Comfort has improved dramatically, especially the bathroom which is a mini ‘Passivhaus’ with high levels of insulation and airtightness with triple glazing and a single room extractor with heat recovery, and rarely drops below 18 degree even overnight in winter.  How much is this extra comfort worth?  Tricky question but let’s say £1000 annually then the total benefit is perhaps £1400 pa.  If the incremental cost for the energy saving element over simply renovating is perhaps £10k then the payback becomes surprisingly quick.  It’s definitely been worth it and becomes more so every year, and if one can separate personal gain from the benefit to the greater good, then even if we sell before we reach the payback period the interventions have been very worthwhile for mankind!