It is always better if the planned activities on your building include as few participants as possible. Thus the responsibility is not divided into small minor parts, but is taken by one main participant. For example, if you are planning to build a family home, it is best if its designer is responsible for both budgeting and supervision. He / she not only knows his project best, but there will be no other culprits if a mistake is made. So you will certainly get a higher quality product at a better price.
The cost of a complex service depends on many factors and its unit rate is usually in BGN / sq.m. To get an individual offer for a complex service for your building, contact me.