Agency says 3 months, AI says a weekend — how long does building a website with AI actually take?

Had the same burst of enthusiasm last month, sat down over the weekend and built a gorgeous-looking site in 6 hours with a popular AI tool. Monday morning the team checked it out: forms weren't firing, product dimensions were totally wrong, mobile menu was completely broken. Spent 3 weeks trying to fix it and ended up having to hire a freelancer anyway.

AI site builders usually generate super bloated, unoptimized code under the hood. The page looks fine on the surface, but the second you run it through Google PageSpeed, the scores hit rock bottom. B2B buyers and corporate procurement folks will bounce immediately if a site loads like molasses or can't download a PDF spec sheet.

Just set aside a weekend and test out one of those $40 tools yourself. See the gaps with your own eyes. You'll likely find that while the design comes together fast, product filtering, tech spec delivery and enterprise tone fall completely flat. That way, whenever you sit down with an agency, you'll know exactly what you're paying for.

Building a site entirely with AI is like buying a pre-made cake base from the grocery store and squirting whipped cream on top. Will it do for a weekend birthday party? Sure. But you can't serve that cake to an executive looking to buy an industrial water treatment plant.

We revamped our wholesale website using a hybrid approach instead of going all-in on an agency. Used AI to crank out wireframe designs and initial copy in 4 days, then handed $2,500 to a local dev to iron out the technical foundation over 2 weeks. That $8,500 agency quote definitely sounds inflated.

3 months is definitely overkill, but doing it in a weekend is pure fantasy. a realistic timeline is 3-4 weeks. btw the agency is probably just stretching the calendar out with project management and revision cycles.

The real reason agencies ask for 3 months isn't coding time; it's waiting on you for copy, high-res assets, and product sign-offs. Even if AI generates the skeleton in minutes you still have to verify the exact technical specs for those industrial filters. It's the human bottlenecks that drag out the schedule not the technology.

Bottom line: If all you need is a basic digital business card and a contact page, an AI builder over a weekend will do fine. But if you need technical product tables, SEO, custom quote forms, and data security, you need 3-4 weeks of hands-on professional work. $8,500 and 3 months is steep; look for a hybrid approach instead.

Sorry, but this doesn't apply in every case. The biggest time-waster for us was not knowing who had the final say.

The real issue isn't the number, but what it's based on. Correct me if I'm wrong.

I agree, and I'd like to emphasize that. If code ownership isn't in the contract you have no bargaining power when leaving.

This is exactly what we experienced. Every "we'll look at it later" in a meeting means unbilled work.

If acceptance criteria aren't written, when the work is done is open to debate. This is my opinion, I'm not claiming it's absolute truth.

Sorry, but this doesn't apply in every case. Payment schedules should be tied to project phases, not calendar dates.

If you post the result here, it will help others too.

Let me write how it's done in practice. Every "we'll look at it later" in a meeting means unbilled work.

Trying to do this alone is the most expensive way.

Timely topic. Implementing a change request process doesn't slow things down, it speeds them up.

If you post the result here it will help others too.

Thanks for writing this, that's the right way. When making a decision, first look at what data you have on hand.

Correct me if I'm wrong.

Let me write how it's done in practice. Payment schedules should be tied to project phases not calendar dates.

Start with a small trial; don't commit to everything at once. If I were you, I'd go this route.

I completely agree. The biggest time-waster for us was not knowing who had the final say.

Let me share what happened to me; it might be useful. Everyone rushing into building a website with AI gets stuck at the same point.

Correct me if I'm wrong.