As other users are suggesting the cost to build an online service marketplace lies in between $30KUSD to $50KUSD. I recommending before hiring any service marketplace, do your research, and go with a cost-effective solution like Yo!Gigs.
Here are the points that we need to keep in mind before going with any solution:
- Backend architecture development
- API integration
- Database development
- Testing of your application
- Application maintenance
Mostly cost depends on these points. So first you should be clear with your upcoming marketplace, features, etc.
For further queries, please share it with me.