First we go through the house as it stands and what you want to achieve. Then come one or more sketches showing possible routes, and only once you have chosen a direction are the drawings produced.

The price is driven by the size of the change, whether permit documents are needed and how much material already exists for the house. Existing drawings make the job smaller.

That is decided by the municipality and depends on what changes, where the house stands and what the local plan says. We can say what is usually required for a similar change and produce the documents the application needs.

Yes, layout and interiors belong together: where the kitchen sits decides how the rest of the floor works. Some want both, others only the sketch and handle the interiors themselves. Get in touch with what you want help with.