Picture a fairly typical setup, one that plays out at startups constantly: a founder hires a web development shop to build the site, and a separate SEO agency to make sure people can find it once it's live. Both vendors are competent. Both deliver what they promised.
And six months in, the founder is stuck between two teams who each swear the other one broke something, while nobody can say for certain why organic traffic still hasn't moved. This isn't a rare story.
It's close to the default outcome when a web development and SEO agency relationship is actually two unrelated relationships wearing a matching outfit.
Where Two-Vendor Projects Usually Break Down
The first break point is technical architecture decisions made without SEO in the room.
A developer optimizing for clean code and a fast build might choose a URL structure, a JavaScript rendering approach, or a CMS that makes perfect engineering sense and creates real headaches for indexing and crawlability. Nobody did anything wrong technically.
The developer just wasn't hired to think about search, and the SEO agency wasn't consulted until the site was already live.
The second is timing.
SEO agencies typically want months of runway to show results, but they usually don't get engaged until after the site launches, sometimes weeks or months after, because "get the site built" and "get it found" get treated as sequential problems instead of one connected one. That delay alone can cost a startup a full quarter of organic growth it didn't need to lose.
The third is accountability, and it's the one founders feel most directly. When rankings underperform, the SEO agency points at site speed, structure, or a redesign the developer pushed through without a heads-up.
The developer points at content quality or a keyword strategy they were never looped into.
Both arguments can be technically true and equally useless, because the founder is the one stuck mediating a dispute between two vendors who don't share a deliverable, a Slack channel, or an incentive to solve it together.
The fourth is duplicated onboarding. Two vendors means explaining your business, your customers, and your goals twice, in two separate kickoff processes, to two teams who will never sit in the same room to compare notes on what they each learned.
And a fifth, quieter problem: content ends up written twice, or not written with search in mind at all. Developers building a site often fill pages with placeholder or minimally-viable copy just to get the layout done, on the assumption that "content" is someone else's job.
If the SEO side doesn't start until later, that placeholder copy sometimes survives into the live site far longer than anyone intended, or gets rewritten from scratch at extra cost once the SEO team finally gets a look at it.
What a Combined Bundle Includes
A combined engagement, with one team responsible for both the build and the search strategy, folds SEO decisions into the build itself instead of retrofitting them afterward.
Site architecture, URL structure, page speed, and structured data (schema markup) get decided with search visibility as a stated requirement from day one, not a punch list handed over after launch.
Content built during the site build is written with actual keyword and topic research behind it, rather than filler copy an SEO team later has to rewrite from scratch.
It also means the growth work (SEO, and increasingly generative engine optimization for AI search tools) can start from launch day instead of waiting for a separate engagement to spin up. There's no ramp-up period where a new SEO vendor is learning your site's existing structure before they can even begin auditing it, because the same team built that structure.
Practically, this usually looks like a single point of contact, one shared understanding of the business and its goals, and one team that can trace a ranking problem back to an actual line of code or a content decision without a finger-pointing exercise first, because there's nobody else to point at.
It also tends to mean fewer surprises when something needs to change later.
A URL structure decision, a new landing page for a campaign, a schema update for a new product line: these get made once, by people who already understand both the technical and search implications, instead of triggering a round of emails between two vendors who each need to check with the other before committing to anything.
Cost Comparison
The sticker price of "one vendor" versus "two vendors" isn't the whole story, but it's a real and underappreciated part of it.
Hiring separately typically means paying for a website in the $800–$8,000 range (more for e-commerce, $2,000–$25,000, or custom software and MVP builds, $8,000–$80,000), and then a separate SEO retainer running $500–$5,000 a month on top, each with its own discovery phase, its own onboarding calls, and its own ramp-up period before real work starts.
That duplicated discovery is the hidden cost most founders don't budget for.
Explaining your business, competitors, and goals twice costs real hours on both sides, and a new SEO vendor auditing a site they didn't build will spend real time (that you're paying for) just reverse-engineering decisions the developer already understood.
Cross-vendor coordination delays add up too; a schema change or a URL restructure that needs sign-off from both teams can sit for a week or two while emails go back and forth, time that a single team could resolve in one internal conversation.
A combined bundle doesn't eliminate the underlying build and SEO costs.
You're still paying for a website and for ongoing search work, and the ranges above still apply, but it removes the duplicated onboarding, the coordination lag, and the finger-pointing overhead that inflate a two-vendor project's real total cost beyond what the two invoices alone suggest. Our pricing page breaks out what bundled packages look like in practice.
Is This Right for You?
A combined bundle makes the most sense if you're launching something new, don't already have a site you're attached to, and want search visibility built in from the start rather than bolted on later.
It also fits well if you've been burned by the two-vendor coordination problem before and want one team accountable for the whole outcome rather than two you have to manage yourself.
It's a weaker fit if you already have a website you're happy with and only need SEO work. In that case, a standalone SEO engagement makes more sense than rebuilding something that isn't broken.
It's also a weaker fit if you have strong opinions about using a specific specialist developer or SEO firm for reasons unrelated to coordination (an existing relationship, a very niche technical requirement one vendor uniquely solves), in which case the coordination overhead might be a cost you're willing to pay for that specific expertise.
If neither of those exceptions applies to you, and you're weighing a new build against the coordination cost of hiring two separate vendors, our page on why one agency for web development and SEO goes deeper into how we structure that combined engagement, including what's actually included at each pricing tier.