Generic lists waste outreach
A database that's 80% irrelevant to your ICP doesn't save time, it just moves the filtering work from before the purchase to after it. Rather than providing generic contact lists, we create highly targeted prospect databases that help you connect with the decision-makers most likely to actually become customers.
Whether you're launching a new product, expanding into new markets, building an account-based marketing strategy, recruiting professionals, or supporting business development, a database built around your actual criteria means the list is usable from the moment it lands, not after a week of manual cleanup.
How this differs from our data card databases
If your target audience fits neatly into a category we already track, like education, healthcare, or one of our 13 professional categories, a pre-segmented list under industries or email lists is faster and often cheaper. A custom database makes sense when your criteria are more specific: a particular combination of industry, company size, technology stack, and geography that doesn't map to an existing category.
A useful way to think about it: data cards answer "who fits this well-known category," custom databases answer "who fits this specific, multi-criteria profile I've defined." Most clients start with a data card when one is close enough, and move to a custom build when the fit starts feeling forced.
How it works
Define your ICP
Tell us your target industries, locations, company sizes, and job titles.
We build the list
Our research team compiles a database matched specifically to your criteria.
Verification
Every record is verified before delivery, at our standard 95%+ accuracy guarantee.
Delivery
Receive your file in Excel, CSV, or CRM-ready format, typically within 4 to 5 business days.
Who uses custom database building
A founder entering a new vertical needs a prospect list for an industry they've never sold into before, with no existing house list to work from.
A recruiter filling a specialized role needs professionals matching a narrow combination of skills, seniority, and location.
A business development lead building an ABM program needs target accounts and decision-makers matched to a specific ICP, not a broad industry export.
Before you commit
- Relevance concerns: the list is built around your ICP from the start, not filtered down from a generic export after purchase.
- Accuracy concerns: 95%+ accuracy with real-time verification on every record.
- Compliance concerns: data is 100% verified and permission-passed, in line with GDPR and CAN-SPAM.
- Scale concerns: projects scale from a few hundred contacts to enterprise-wide databases.
Frequently asked questions
How is this different from your Professional Contacts Database or Education Industry Data?
Those are pre-segmented databases you can order directly by category. A custom B2B contact database is built from scratch around your specific Ideal Customer Profile when your criteria don't map cleanly to an existing data card.
What information do you need from me to build a database?
Target industries, locations, company sizes, and job titles. The more specific your Ideal Customer Profile, the more targeted the resulting list.
How is the database delivered?
In Excel, CSV, or CRM-ready format, depending on what your team needs.
What's the minimum or maximum size for a custom database?
There's no fixed minimum or maximum. Projects range from a few hundred highly specific contacts to enterprise-scale databases in the hundreds of thousands.
How accurate is a custom-built database?
Data Mappers offers 95%+ accuracy with real-time email verification, and every record is 100% verified and permission-passed.