All three work. All three fail, in different and fairly predictable ways. The question is not which is best but which failure you can least afford.
A freelancer
Right when: the scope is clear and bounded, the budget is tight, and you have somebody internally who can make decisions and chase things.
You usually get more skill per taka than anywhere else, because you are not paying for an office or account management. A good freelancer who knows your industry can deliver something an agency would charge several times for.
The failure mode is availability. One person, no cover. They take a full-time job, get ill, or take a bigger client, and your project stops. This hurts most after launch — the site breaks on a Friday and the one person who understands it is unreachable. Ask up front what happens then, and get the files and access in your own accounts from day one.
An agency
Right when: the project spans several skills, you need it to still work in two years, or nobody internally has time to manage it.
You are buying a team and continuity: design, development, content and SEO under one agreement, with somebody whose job is keeping it moving. Agencies also tend to have done your exact project before, which shows in the problems they anticipate.
The failure mode is distance. You may not get the people you met in the pitch, you are one of several clients, and small changes go through a process. Ask who actually does the work, and what the response time is for something broken versus something cosmetic.
In-house
Right when: the website is the product, or it changes most weeks.
Someone who is there every day accumulates knowledge of your business that no external party will. For an e-commerce operation or a platform business, that compounds.
The failure modes are two. First, the real cost is not the salary — it is salary plus equipment plus the months spent hiring plus the time they are not productive while learning. Second, one developer cannot be good at everything; you will still be buying design or SEO from outside. And when they leave, everything they knew leaves with them unless it was written down.
What people get wrong about the cost comparison
Freelancer quotes look cheapest because they usually cover only the build. Compare over three years, including who fixes it when it breaks, who applies updates, who makes the change you need next month, and what happens if that person becomes unavailable.
Run that comparison honestly and the gap narrows a lot. It sometimes reverses — see what a website actually costs for which parts of the bill people forget.
The arrangement that works for most small businesses
Not one of the three, but a combination: build with whoever fits the project, then put a maintenance arrangement in place with somebody who will answer, and keep every account — domain, hosting, analytics — in your own name.
That last point matters more than the choice itself. Whichever route you take, if you own the accounts you can change your mind later. If you do not, you cannot — and that is the single most expensive mistake in this whole decision.
Whoever you are considering, the eight questions in how to choose a web development company apply to all three. Tell us what you are weighing up — if a freelancer is the right answer for your project, we will say so.