In-House Developer vs Agency — Compare the Real Cost

The build-it-with-employees versus hire-an-agency decision usually gets made on a gut feel about the sticker price — a developer's salary against an agency's hourly rate. That comparison is misleading because the two numbers are not measuring the same thing. This calculator puts them on equal footing: it computes the fully-loaded annual cost of an in-house developer and the annual cost of an agency engagement, then compares cumulative spend across one, two, and three years. Everything runs in your browser as you type.

For the in-house side we take base salary and multiply it by an overhead factor you control. Base pay is rarely more than 70–80% of what an employee actually costs once you add payroll taxes, benefits, paid time off, equipment, software, recruiting, and the management time the role consumes. A multiplier of 1.3 is a reasonable starting point; set it to match your own loaded cost. For the agency side we take a blended hourly rate and multiply it by the hours you genuinely need each month, then annualize. The breakeven is simply the point where the two cumulative lines cross.

Why the overhead multiplier changes everything

Teams routinely under-count the cost of an employee by a third or more, which makes in-house look cheaper than it is. The multiplier exists to correct that. When you set it honestly, the agency's higher headline rate often closes most of the gap — because that rate already bundles benefits, downtime, tooling, and the fact that you only pay for the hours you use. The flip side is that a full-time employee working steady 40-hour weeks on the same rate would be far more expensive as a contractor. The right comparison is always loaded employee cost against the hours you actually need.

Cost is not the whole decision

This tool sizes the money, but money is one factor. An in-house engineer accrues institutional knowledge, is available for whatever comes up, and aligns tightly with your team — at the price of fixed cost, hiring risk, ramp time, and management overhead. An agency or senior contractor gives you experienced skills on demand, a faster start, and no long-term commitment, but the relationship is bounded by the engagement. The steadier and more proprietary the work, the more an employee makes sense; the more bursty or specialized it is, the more an agency does. Our blog digs into how to make that call, and the glossary covers the terms.

The hybrid almost everyone lands on

In practice the answer is frequently both. A high-leverage pattern is to bring an agency in to set the architecture, ship the first production release quickly, and establish the engineering standards, then transition to an in-house team for steady-state ownership. You get the agency's speed and senior judgment up front and the cost efficiency of employees over the long haul. We are often the agency in exactly that arrangement, and we write the handoff documentation that makes the transition clean rather than building in lock-in. If that sounds like your situation, our development services are structured around it.