I'd just multiply my usual consulting rate by the hours it's going to take me. If you don't have a consulting rate, ask around you area, because it depend of yo

I'd just multiply my usual consulting rate by the hours it's going to take me. If you don't have a consulting rate, ask around you area, because it depend of your country/city. > It will take us 14 days (full time) to satisfy the request An organization that employs 30,000 people has probably a lot stakeholders. Unless there's a hard deadline, you will be looking into a huge amount of "release fallout". Expect stupid requests such as "change the font —why? —Because the boss says he doesn't like it". I'd estimate 20 hours of petty changes spread over three weeks. > Should we be offering to support it going forward (we have full time jobs) and if so how much should we charge for this? If you have full time jobs, avoid it like the plague. Recommend someone you trust. > Should we be charging them a monthly fee for using our technology as well as a one off fee? Is your technology infrastructure? Is it open source software? Proprietary software? You're potentially looking into a handsome amount of money here, depending on the nature of what it is, and if it can be easily replaced by something else. > If they ask us to host it I presume we should be asking for a hosting fee as well? Yes, they will expect you change a monthly amount for this. Usually it's billed under "support & hosting" for a fixed monthly fee, which can be substantial (say, 500 USD/mo). But again, avoid it if you value your free time.