Survey for sustainable improvement of apartment
My partner and I have recently bought an apartment in Utrecht with energy label F (in 2e Daalsebuurt en omgeving neighborhood).
We want to do some renovations to improve energy efficiency, but we would like to have some professional advice on what are the limitations, possibilities, priorities and to get quotes. We already know that, for example, the walls of the building are solid, therefore cavity wall insulation is not possible. We want to find out more limitations and more details. We also know that the windows are sash windows, which are typically not very efficient: how can these be improved? The front door (which connects to the stairs leading to first and second floor, where the apartment is) has clearly some air draft at all times. Should it be replaced? Or does it not matter since cold air stays down?
My question is: what are the best companies/entities to get professional advice (preferably budget-friendly) for sustainable renovations? Thank you in advance for tips!