Website Requirements
for Startup SEO
The eight technical foundations every UK startup site needs before content investment starts paying back. With audit checks, typical issues plus what each one costs to fix when missing.
Eight foundations. HTTPS, mobile responsiveness, Core Web Vitals (LCP <2.5s, INP <200ms, CLS <0.1), crawlable HTML, XML sitemap, schema markup, SEO-friendly URLs plus an internal linking system. All eight need to be in place before content investment makes sense. Most startup sites pass four to six plus fail two to four. The failures are usually fixable in two to four weeks. A full rebuild is rarely necessary plus usually a mistake.
Three numbers that decide
whether your site can rank
Content investment compounds only if the technical foundation can hold it. These three numbers separate sites where SEO will work from sites where it cannot, regardless of how much content gets published.
Technical foundations
HTTPS, mobile, Core Web Vitals, crawlability, sitemap, schema, URLs plus internal linking. All eight need to pass. Missing any one caps the upside of every piece of content built on it.
LCP threshold
Largest Contentful Paint must complete under 2.5 seconds on mobile. Sites failing this cap out at position 8 to 12 for competitive terms regardless of content quality. The single biggest technical gating factor.
Mobile traffic share
Of UK organic search now happens on mobile. Mobile-first indexing means Google evaluates your mobile site, not your desktop one. A desktop-only-optimised site fails before content is even read.
Foundations decide the ceiling. Content fills it.
If your site fails Core Web Vitals, the best content in your niche will rank at position 11 instead of position 3. The content does not get punished. The foundation underneath it does. Same writing. Same depth. Wildly different commercial outcome. This is the cruel asymmetry of technical SEO. The foundations decide the ceiling plus the content decides where you sit under that ceiling.
The eight foundations break into three categories. Crawlability decides whether Google can read the page at all. Performance decides whether visitors actually stay long enough to engage. Structure decides whether the page can be understood plus connected to others. All three categories need to pass. A site that passes two of three still caps out at mediocre rankings.
The audit panel below is the standard check we run on every startup site at month one before any content work begins. The results are usually mixed. Most startup sites pass four to six of the eight, fail one to two outright plus need work on the rest. Fixes typically take two to four weeks. Worth doing before the content investment compounds against a foundation that cannot hold.
For the full commercial picture of how we deliver this for UK startups, the SEO for Startups service page sets out exactly what is included, what it costs plus what results to expect inside the first twelve months.
Three categories the eight foundations sit inside
Each foundation belongs to one of these three categories. Knowing which category an issue sits in tells you how serious it is plus how urgent the fix is.
Crawlability
Can Google's bot actually read every page? HTTPS, crawlable HTML, XML sitemap plus SEO-friendly URLs all sit here. Failure means pages do not even enter the index. The most catastrophic category to fail.
Performance
Does the page render fast on mobile? Core Web Vitals plus mobile responsiveness sit here. Failure caps rankings even when crawlability is fine. Most startup sites fail at least one Core Web Vital on launch.
Structure
Does the site organise content in a way Google can understand? Schema markup plus internal linking sit here. Failure means each page fights alone. With structure each page reinforces every other.
If you only have time to fix one category, fix crawlability first. A site that cannot be crawled cannot rank no matter what else is true. Performance second because it caps the upside of crawlable pages. Structure third because it amplifies pages that are already performing.
The eight-point startup site audit
The standard check we run before any content work begins. Each row is a foundation, its current pass/fail status on a typical pre-engagement startup site plus the exact check we run.
https:// with valid certificate. No mixed-content errors.view-source shows full HTML body. Googlebot crawl-as test renders correctly./sitemap.xml found. Not submitted to GSC. Fix in 2-3 hours.?id=123 patterns found.The order of fixing matters. Sitemap first because it lets Google find pages. Then internal linking because it shapes how authority flows once pages are crawled. Then schema because it tells Google what each page is. Core Web Vitals last because each previous fix usually creates a small CWV win along the way. Sequencing badly turns a 2-week job into a 6-week one.
Five technical gaps that
silently kill startup rankings
Each of these is invisible to the founder until rankings refuse to appear. The content team blames the writers. The writers blame the keywords. Neither is wrong but neither is the actual cause. The actual cause sits in the technical foundation.
Slow page load
Missing schema
No sitemap
JS-only content
Orphan pages
JavaScript-only content is the trickiest of the five. Modern frameworks render content client-side which Googlebot processes through a second pass that often misses dynamic content. The fix is server-side rendering or pre-rendering plus is not a content-team problem. If your stack is React, Vue or Next.js without SSR, audit this first.
SEO-ready site vs
SEO-blocked site at month 12
Same content team. Same retainer. Same 24 articles published. One site ranks. The other does not. The difference is whether the technical foundation could hold the content investment.
Foundation gaps unfixed
- ✗LCP at 4.1s on mobile. Rankings cap at position 8 to 12 for every commercial term regardless of content depth or relevance.
- ✗No sitemap submitted. Google discovers pages through random links rather than systematic crawling. 30% of published content not in the index at month 12.
- ✗No schema markup. Pages compete on text quality alone. Featured snippet eligibility blocked. FAQ accordion eligibility blocked. Visibility weak.
- ✗14 orphan pages. Pages with no internal links pointing to them. Authority never flows into them. They rank at position 50+ permanently.
- ✗Result: 280 monthly sessions at M12. Roughly one tenth of where the same content would land on a sound foundation.
Foundation fixed at month 1
- ✓LCP 1.9s on mobile. Core Web Vitals in green. No ranking ceiling from technical limits. Content competes on quality alone.
- ✓Sitemap live plus submitted. Every new piece is discovered within 24 hours. Indexation rate above 95% at month 12.
- ✓Article, FAQ plus Organisation schema on every page. Featured snippet eligibility unlocked. FAQ accordion appears for relevant queries.
- ✓Cluster-aware internal linking. Every spoke links to its hub plus to 2+ siblings. Authority concentrates where it should.
- ✓Result: 2,847 monthly sessions at M12. The full asymmetric back half of the curve plays out as expected. Same content, ten times the outcome.
Free eight-point technical audit
before any retainer starts.
We work with UK startups on a clear monthly retainer from £350. No setup fee. No twelve-month tie-in trap. We run the audit first plus tell you exactly what needs fixing before content investment starts compounding against a foundation that cannot hold.
This article is the fifth in the Strategy plus Execution section of our complete SEO Guides for Startups series. The remaining guides cover site structure, blogging plus Google Business Profile. Together they cover every operational detail from foundation through to publication.
SEO Guides for Startups
The full index of every startup SEO question we have answered. Cost. Timescales. Strategy. Mistakes. Use it as your reference plus come back to it whenever a new question comes up.
More from the startup SEO guide
Once the foundations are sound, the next question is how to structure the site so content compounds. How to Structure a Startup Website for SEO walks through page architecture plus URL hierarchies. Blogging for Startup SEO covers how to actually fill the structure with content that ranks. How an SEO Agency Delivers for Startups covers the production cycle that fills the site.