If the foundations are sound and the problem is presentation, you need a redesign. If the foundations are wrong, a redesign puts fresh paint on a structure that will fail again in eighteen months.
The useful question is not whether the site looks dated. It is whether the things underneath the appearance still serve the business.
Redesign if the structure holds
A redesign is the right call when the platform is maintained, you control the hosting and the domain, the content can be edited without a developer, the site loads acceptably on a phone, and the pages that matter exist and are findable.
In that situation the complaints are usually about clarity: the offer is not obvious, the copy talks about the business rather than the customer, the enquiry route is buried, the imagery is tired, the hierarchy is flat. Those are content and interface problems, and they are the cheaper class of problem to fix.
Rebuild if the foundations are wrong
A rebuild is warranted when one or more of the following is true and cannot be fixed in place.
- Mobile performance is poor because of how the site is built, not because of one heavy image.
- The page structure cannot express what you now sell, so new sections are wedged into the wrong templates.
- Editing requires a developer for routine changes.
- You do not control the code, the hosting or the domain, and cannot move without permission.
- The platform or theme is unmaintained, or updates break things reliably.
- The site cannot connect to anything: no sensible way to pass an enquiry, booking or order into your other tools.
- Accessibility problems are structural rather than cosmetic.
A short audit you can run yourself
- Open the site on your own phone on mobile data. Time how long until you can read something useful.
- Try to make a small text change yourself. Note whether you could, and how long it took.
- Check who holds the domain registration, the hosting account and the source code.
- List the three things a new customer most needs to know. Find each on the site and count the clicks.
- Submit your own enquiry form and see where it arrives and how quickly.
- Look at what people actually search for to find you, and check whether a page answers it.
- Ask whether the site could support the next thing you want to offer, or whether it would need surgery.
If most answers are acceptable and the rest are about wording and appearance, redesign. If several answers concern control, structure or capability, rebuild.
The middle option people forget
Sometimes the right answer is neither. Rewriting the copy, reordering the navigation, replacing the photography and fixing the enquiry route can transform a site without touching the build. It is unglamorous work with a good ratio of effort to effect, and it is worth trying before committing to anything larger.
Do not rebuild for fashion
Design trends move faster than businesses do. A site that is three years old and still communicates clearly is not a problem. Replacing a working site because it does not resemble this year references is an expensive way to reset your search history, your content and your institutional knowledge for no operational gain.
The honest test is whether a specific, describable thing is going wrong. If you cannot name it, keep the site and spend the money elsewhere.
If you do rebuild
Carry the good parts across. Keep the pages that already work, preserve their addresses or redirect them properly, and keep the content that answers real questions. A rebuild that quietly discards existing pages loses whatever understanding search engines and returning visitors had already formed.
Agree at the outset where the code lives, who can edit what, and what happens at handover. Those answers depend on the proposal rather than on any general rule, and they are worth settling before work begins.