Direct Answer
Custom software for a service business ranges from $5,000 for a simple internal dashboard to $250,000+ for a multi-user portal with auth, billing, and integrations. The Leads to Sales sweet spot is $15,000–$60,000 — a custom client portal, internal dashboard, or workflow tool built in 6–12 weeks.
Voice answer (≤30 words)
“Custom software runs from five thousand for a simple dashboard to two hundred fifty thousand for a full portal. Most fits between fifteen and sixty thousand.”
The biggest cost driver is auth and multi-user access. A read-only internal dashboard is 5x cheaper than a multi-tenant portal with login.
Use a discovery sprint (1 week, $1,500–$3,000) to scope before committing to a full build — it avoids 90% of cost overruns.
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Leads to Sales runs the custom software side of growth for U.S. service businesses. Get a fixed-price scope and a 24-hour proposal.