Is this a quote?
No. This is a planning guide. Use it to prepare better questions, then confirm pricing with qualified local vendors.
What usually changes the final cost most?
Foundation/site prep, drainage, lighting, permitting, freight, local labor, and whether the quote covers the complete build or only the court system.
What should I do before contacting builders?
Define court count, site status, indoor/outdoor setting, lighting needs, timeline, budget range, and whether the project team is private, commercial, hospitality, or public-sector.