SEO or a new website: which should you pay for first?

You have one budget and two proposals. The SEO agency says the site is invisible and needs content and fixes. The web design agency says the site is dated and nobody trusts it. Both are probably partly right, both are selling the half they do, and neither has an incentive to tell you the other one should go first.

The order matters because the two can undo each other. Content written for a site you are about to rebuild can be lost in the rebuild, and a beautiful new site launched without its old addresses redirected can lose the search traffic you already had. This page helps you work out which problem you actually have and in what order to buy the fixes. It does not rank agencies or quote prices; the rankings it links to name firms and say what they publish.

The question is where you lose people

SEO and web design solve different failures. SEO is for a site that buyers do not find: it ranks for too few of the questions your customers ask, or ranks too low to be clicked. Web design is for a site that buyers find and then leave: the pages load, the visitor reads, and nothing happens.

Most companies have a bit of both, but rarely in equal measure, and the bigger one should get the money first. Guessing is expensive, because each kind of agency will diagnose the problem it sells. You can settle it yourself with reports you probably already have.

Three reports that settle it

How often you appear. The Performance report in Google Search Console shows impressions (how often your site appeared in results), clicks and average position, by query and by page. Filter it to the queries a buyer would type when looking for what you sell. Few impressions on those queries means search is not putting you in front of buyers, whatever the site looks like. Plenty of impressions at a poor average position means you are close, and that is SEO work.

What the visitors you already get do. In your analytics, look at enquiries, demo requests or sales per visit for the pages people land on. If visitors from search convert at a reasonable rate, the site is doing its job with the traffic it gets, and more traffic is the cheaper lever. If the pages with the most visits produce almost nothing, more traffic will produce more of nothing.

Whether the site is in the way. Search Console's Core Web Vitals report measures real visits against three thresholds Google publishes on web.dev: the main content loading within 2.5 seconds, a response to interaction within 200 milliseconds, and a layout shift score of 0.1 or less, each at the 75th percentile of page loads. Failing these is worth fixing, but keep it in proportion. Google says on its page experience documentation that it always seeks to show the most relevant content, even if the page experience is sub-par, and that there is no single page experience signal. A slow site is a reason to fix the site, rarely the reason you are not ranking.

When SEO should come first

Pay for SEO first when buyers rarely see you and the people who do arrive convert. The site is not the bottleneck; reach is. A search agency can usually work on the site you have: technical fixes, new pages for the questions buyers ask, and the links that earn them a position.

The one exception is a site that physically cannot do what the SEO work needs. If your team cannot create a new page without a developer, if the platform will not let you change titles or addresses, or if content is loaded in a way search engines struggle to read, the SEO agency will tell you so within the first audit. At that point the rebuild comes first, and it should be scoped with the SEO findings in hand.

When the website should come first

Pay for the website first when the traffic is there and it does not convert, or when the site is the thing stopping the SEO work. But check what kind of conversion problem it is before buying a rebuild. A site that ranks and receives visits but produces no enquiries often has a messaging problem rather than a design one, and our guide to branding or web design sets out how to tell the difference cheaply.

The other case is a site that is genuinely at the end of its life: a platform that is no longer maintained, a structure that cannot take the pages you need, or a brand that has changed underneath it. Then the rebuild is unavoidable, and the useful question becomes how to do it without losing the search traffic you have.

If you rebuild, the rebuild is an SEO project

Google's own advice on whether you need an SEO is that a great time to hire one is when you are considering a site redesign, the earlier the better, so the site is designed to be search engine friendly from the bottom up. The reason is that a rebuild decides your page structure and your addresses, and those are the two things hardest to change afterwards.

What goes wrong is usually the addresses. Google's guidance on moving a site with URL changes is specific:

• Map every old URL to its new equivalent, starting from your sitemaps, the pages with the most traffic in your analytics, and the pages other sites link to.
• Use permanent redirects, such as 301 or 308, and keep them for as long as possible, generally at least one year.
• Do not redirect many old pages to one unrelated page such as the new home page. Google may treat that as a soft 404, which means the old page's standing is lost.
• Expect rankings to fluctuate while Google recrawls. For a medium-sized site it can take a few weeks or more before the new addresses replace the old ones in results.

None of this is difficult, but someone has to own it, and in a split engagement it is easy for each agency to assume the other does. Put the redirect map in the web design contract as a deliverable with a named owner. For the platform-specific steps, our WordPress to Webflow and Webflow to Next.js and Sanity guides walk through them.

Route by where you are

Buyers rarely find you, and the ones who do convert. SEO first. If you sell software, start with the SaaS SEO agencies; if your sale goes through a buying committee or a distributor, the B2B SEO agencies.

Traffic arrives and leaves. Website first, after checking it is not a messaging problem. Software companies should look at the web design agencies for SaaS; everyone else at the web design agencies.

The site has to feed a CRM, a quote form or product data. Website first, and look for a firm that designs the search structure into the build. The B2B web design agencies include several that sell both.

Organic traffic fell after a replatform. That is an SEO problem caused by the website, and it needs a technical search specialist rather than a content agency. Both SEO rankings name the firms that do recovery work.

You are leaving WordPress anyway. Treat the migration as the risk and hire for it: the Webflow agencies for WordPress migration are ranked on exactly that.

You want to appear in AI answers as well as Google. Most of the groundwork is shared with SEO. The AI SEO agencies are the ones that measure it, and our guide to AI SEO agencies or AEO tools covers what to buy first.

The two questions that catch both mistakes

The two mistakes mirror each other. One is rebuilding a site that converts well because it does not rank, and losing the traffic it had. The other is pouring content into a site that converts nobody.

One question to each agency catches both. Ask the web design agency who owns the redirect map and how it will check, after launch, that old addresses land where they should. Ask the SEO agency what it would fix on your current site before recommending a rebuild. A firm with a good answer to its question is usually the right one to hire first.