In-house team vs agency: who should build your software?

Side by side

What the two options mean

An in-house team is made up of people you employ to work on your software. They sit inside your organization, learn your business, and work only on your products.

An agency is an outside company with its own team of designers, engineers, and project leads. You engage it for a project or an ongoing arrangement. The agency brings people, tools, and ways of working that already exist.

We are an agency, so this comparison is written from that side of the table. We have tried to be fair about it, because the wrong choice costs both sides time and money.

Cost: monthly payroll or a quoted project

An in-house team costs money every month, whether or not there is a project. Salaries are only part of it. Recruitment, benefits, equipment, software licenses, training, and management time all add up. Hiring the wrong person is expensive and slow to correct.

An agency charges for defined work. You know the price before it starts, and you are not paying for people between projects. The agency's rate per person is usually higher than a salary, because it covers the agency's own costs. The saving comes from paying only for the work you need, when you need it.

For a defined project, an agency is usually less expensive overall. For steady work that never stops, a well-run in-house team usually is.

Speed to start

Building an in-house team takes time. Finding the right people, interviewing, waiting for them to start, and bringing them up to speed often takes months. Until the team is complete, the work moves slowly.

An agency can usually start within weeks, because the team already exists and has worked together before. For a launch with a deadline, that difference is often decisive.

Range of skills

A modern software project needs many skills: product thinking, user experience (UX) design, which is how easy and pleasant the product is to use, interface design, front-end and back-end engineering, cloud setup, security, testing, and often data and search. Few companies can hire all of these, and fewer still need all of them full time.

An agency brings the whole range and uses each skill when the project needs it. An in-house team has the skills of the people you hire. That is fine when the work is narrow and steady, and limiting when it is broad or changing.

Control and product knowledge

In-house teams give you direct control. You set priorities every day, and the team builds deep knowledge of your product, your customers, and your history. Over years, that knowledge is valuable.

With an agency, control comes through an agreed scope, regular reviews, and working software you can see. A good agency shows progress often and changes course when you ask. Product knowledge builds up within the project, so a clear handover and good documentation are essential.

Continuity and risk

Both options carry risk. In-house, the risk is people leaving. If one key engineer holds most of the knowledge, losing them can stall the product. Documentation and shared ownership reduce that risk.

With an agency, the risk is dependence. If you do not own the code, the accounts, and the documentation, it is hard to change provider. Make ownership part of the agreement from the start. You should own everything that is built for you.

The combined approach

The choice is rarely permanent. A common and healthy pattern is to start with an agency, launch a working product, and learn what it needs. Once the work becomes steady, the company hires in-house for the roles it needs every day.

The agency then helps those new people get up to speed and stays available for specialist work and busy periods. The company gets speed at the start and deep ownership later, without paying for a full team before it knows it needs one.

A worked example

Picture a logistics business that wants a customer portal and a driver app. It has no developers today, and the launch is tied to a new contract that starts in three months.

Recruiting a full team in time is unlikely. An agency builds and launches the portal and the app in stages. A year later, the product is central to the business and changes every week. The company hires two developers and a product manager. The agency hands over the code and documentation, works alongside the new team for a period, and steps back to specialist work.

When to choose each