This is a real question worth taking seriously, because a lot of small businesses are doing exactly this — and some of them are doing fine. A cleaning service with 200 Facebook followers, consistent posts, and good word of mouth can absolutely run a healthy business without a website.
So let's be honest about when Facebook is enough, and when it isn't.
When Facebook-only actually works
Facebook works well as your primary presence when most of your business comes from referrals and repeat customers, when your clients are already active on Facebook and that's how they naturally find local services, and when you're in a niche where community groups are genuinely where people ask for recommendations ("does anyone know a good house painter?").
In those situations, a Facebook page is real infrastructure. It's where reviews live, where you post photos of your work, and where people tag you when they recommend you. That's legitimately valuable.
Where it starts to break down
The problem isn't Facebook itself — it's the things Facebook can't do and the risks that come with building on someone else's platform.
You don't own it. Facebook can change its algorithm, reduce the reach of business pages, or — in an extreme case — delete your account. It has happened. Any business that has built its entire presence on a platform it doesn't control is one policy change away from starting over.
It doesn't show up the same way in Google. When someone searches "HVAC repair Aurora CO" on Google, a Facebook page rarely shows up prominently. A website with the right structure can. If you want to capture people who are actively searching for what you do — rather than people who already know you exist — you need a presence that Google can properly index and rank.
It signals a certain level of investment. This one is harder to quantify, but real. When a potential customer is comparing two businesses — one with a Facebook page and one with a clean, professional website — the website signals that you've committed to your business more seriously. For larger jobs, higher-priced services, or commercial clients, that signal matters.
You can't control the experience. On Facebook, your page is surrounded by notifications, ads, and whatever else the platform decides to show. A website gives a visitor your business and nothing else — your words, your photos, your contact information, in the order and presentation you choose.
The honest answer
If your business is running well and Facebook is working for you, you don't need to fix something that isn't broken. But if you're trying to grow beyond your existing network, attract customers who don't already know you, or take on larger or more valuable jobs, a website gives you capabilities that Facebook can't replicate.
The two aren't in competition. The best setup is both — a website as your owned, permanent foundation, and Facebook (or Instagram, or Nextdoor) as one of the channels that drives people to it.
What you don't want is a situation five years from now where something changes on Facebook's end and you realize you built your entire business presence on rented land.