Expect anywhere from a few thousand to a few tens of thousands. One published agency guide puts a simple API connection at $3,000 to $8,000, while another prices a full website-to-CRM project at 8,000 to 30,000 EUR. The gap comes from decisions, and how many of them you make before anyone starts typing.
The cheap end is a set of forms that create contacts in the CRM. The same EUR guide prices five to ten forms with field mapping at 2,000 to 4,500 EUR and one to two weeks of work, and says a native connector from the CRM vendor can cost 0 to 2,000 EUR upfront. Under roughly 100 leads a month with a standard sales process, that guide says native is usually enough. Most people stop reading here. That is how they end up surprised later.
The price steps up when data has to travel both ways. Two-way sync means your site and your CRM can each change a contact, so someone has to decide which one wins. The guide puts that module at 3,000 to 8,000 EUR and two to three weeks. The other guide lists database syncing of this kind at $8,000 to $15,000. Real-time sync costs more than a nightly batch, so ask whether your sales team needs to see a lead in seconds or by morning.
Then come the modules nobody wrote into the brief. Tracking of sources and campaigns runs 1,500 to 3,500 EUR in that guide. Lead scoring is 1,500 to 6,000. Routing leads to the right person by region or product is 1,500 to 5,000. Testing and handover is another 1,000 to 3,000. A typical mid-market project combines four or five of these, and that is how a "simple CRM hookup" turns into a five-figure line on the quote.
Your existing data is the other multiplier. One guide says messy data can double migration costs, and that older systems can add 50 to 100 percent. If your contacts live in a few spreadsheets and an inbox, the integration is the easy half.
The build is not the last invoice. The same guide puts yearly maintenance at 10 to 20 percent of the initial cost, so a $20,000 integration can mean $2,000 to $4,000 a year. Connectors run $50 to $500 a month on that guide's numbers, and CRM licences are separate again. Vendors also change their systems, and a mapping that worked last spring can quietly drop fields by autumn.
Timing matters too. Simple connections take two to four weeks in one guide, and a standard website scope with forms, tracking, sync and basic scoring takes four to six weeks in the other, with complex routing adding two to four more. Add the CRM after the site is designed and the form fields get redesigned twice, once for the page and once for the data.
A caution on all of these figures. They come from agencies that sell this work, they are in different currencies, and they disagree with each other. Treat them as a map of where the money goes, not a quote. The honest way to get a real number is to ask two or three studios to price the same scope: how many forms, which fields, one-way or two-way, what scoring, how much old data.
So put the CRM in the brief before the site is designed. Tell us which CRM you use, how many leads a month you expect, and what your sales team does with a lead on day one. Those answers decide most of the bill, and they cost far less to settle now than after launch.