If you’re reading this, you’re probably thinking about your current website and whether it truly meets your needs or not. A website redesign isn’t always something that a business or organization wants to do, but often is a matter of necessity. Whether your site has grown long in the tooth or simply isn’t performing as well as you like, it may be time to finally move ahead with your revamp.

But how often should you redesign your website? The truth is that depends on a number of different factors.

Time is money, so let’s get the simple answer out first. Typically, a good rule of thumb is that an average website has an approximate “shelf life” during which it is seen as new, functional and convenient for users. For the typical brand, that timespan is between 18 and 30 months – or 1.5 to 2.5 years or so.

Now that isn’t a hard and fast rule – some sites may not need a full redesign in that time, and some may need to be refreshed more frequently as business goals or market demands change. After all, age is only a number, right? However, for the reader looking for a quick answer, it’s usually a good idea to think about refreshing your website about as frequently as most of us get a new smartphone.

Outside of that broad perspective, the main driving factor behind most website redesigns is the need to solve a problem that you’re having. For some organizations, that may be a decline in business or a drop in visibility in search results. For others, it may be a more dramatic spark like a site hack or a competing site stealing content. Whatever your concern, a smart redesign may help.

When building out a renewed site, discuss the challenges you want to overcome with the team involved in designing your new site. If you want the site to drive leads, it’s important to focus on incorporating a flow of pages to lead to a form submission or information request page. If you want to sell online, on the other hand, you need pages to identify a visitor’s needs and provide them the right product or service solution as quickly and conveniently as possible. Or, if its greater visibility and traffic you want, you need to include pages and content that can be optimized for SEO – search engine optimization – to build up your online presence.

Another reason to invest in website design is more cosmetic – your site’s look and feel. Think of your website as a home. People arrive at the site and immediately get their first curb appeal impression of your brand. Is it telling them that you’re modern and engaged and capable of delivering the product, service or support they need? Or is it dilapidated, featuring outdated design elements like traffic counters or flashing banners and reeking of something past its prime? If the latter, a redesign is almost certainly what you need.

Investing in the look of your website is like renovating your home before sale. If the bathroom or kitchen haven’t seen fresh paint or new fixtures in a few decades are likely to steer buyers away in the same way that a site that looks like it’s from the early days of the internet is likely to get visitors bouncing.

But, in the same way that not every renovation project will help your home sale, you don’t need to necessarily upgrade every aspect of your existing site to see an impact. Sometimes simply giving the home page and key categories pages some TLC and applying a new look to existing content elsewhere can be just the boost you need at a fraction of the time and expense.

If your site doesn’t perform well, that’s another sure sign that it’s time to invest in a new site. This is a fairly subjective idea, however, and can take many forms and manifest in different ways. For example, if your site features high-quality content that is buried seven pages – or seven clicks – deep, that’s not an effective design. If your site has many links that lead nowhere or to defunct pages – links that lead to error or 404 pages, whether on your own site or offsite – or your pages load slowly or your site isn’t mobile responsive (a cardinal sin in today’s web), these are all signs that it’s time to kick off a website redesign.

It’s also worth considering if your site works right for you and your visitors. Is it serving as an informational resource for visitors? Are they finding what they need easily? Are you able to make updates or changes to product information, service features or inventory items easily on your own? If the answer to any of these questions is “no,” the answer to whether you need a redesign is a resounding “yes.”

Regardless of what steers you toward the redesign, you should try to make sure that any new site is as future-focused as possible to help you get the most from your investment. That means thinking about these “seven S’s” of site design:

There’s nothing wrong with coming to the decision that it’s time to put your current look out to pasture. The web is constantly evolving and adapting, and if you’re not moving to adjust with it, you’re bound to be left behind. Invest in building a new site not because you think you should, but because you need to if you want to stay relevant and offer the best content and experience to your visitors. Approaching a redesign smartly means you can work to make something that’s nimble and adaptable so you can update and change with the web. Remember that at the end of the day, redesigning and launching a redeveloped site marks just that – a launch of something new – and that work to improve and adjust it is never truly done. Your site is a living story about your brand – make sure it’s telling the right one.