There’s no way to sugarcoat it: Planning a website or redesign is an enormous undertaking. At the enterprise level, a site redesign can take several months to more than a year to complete, cost hundreds of thousands, even millions, of dollars and span thousands of pages.

If you’re the one planning for the design, you’ll need to consider the time and cost, as well as messaging, site layout, brand identity, user experience and performance.

You’ll need to meet with key stakeholders to define business goals and figure out who your customers are and why they’re coming to your site.

You’ll also need to create content that engages your audience at key touchpoints and nudges them through your funnel.

And that’s just the beginning.

After you’ve conducted research with stakeholders and devised a path forward, you’ll actually need to build the thing. That could mean hiring a third-party web development agency or creating an entirely new codebase in-house. Either way, you’ll have to think about the architecture and SEO structure, third-party integrations and responsiveness across screen sizes and browsers.

Even after the launch, you won’t be done. You’ll need to continue to iterate and test how well the site is performing against benchmarks. (And considering the average lifespan of a website is just two years and seven months, you probably don’t want to spend years building it).

Read more: Your 9-Step Guide to Website Planning