Residential energy modelling

I am looking for an experienced energy modeller who can help me improve energy efficiency in a residential building. The modelling I need is Building Energy Modelling and I am open to any software recommendations that the modeller recommends - I'm not married to any one system. The main purpose of the model is to identify ways to reduce energy consumption and make the property more efficient. I am looking for an experienced modeller who can provide guidance and recommendations for steps that can be taken to improve energy efficiency in the property.