Agency: Yellowball · Location: Southwark, London, UK. This is an independent buyer-oriented directory profile, not a paid endorsement or a claim that Mosai has audited the agency.
Yellowball is a London web design and digital marketing agency with an address at Borough Yards in Southwark. Its official site covers bespoke web design, WordPress and WooCommerce development, SEO and paid search. The agency also describes ongoing WordPress support.
When this agency may be a fit
Worth evaluating for a business planning a website redesign or platform migration that must preserve organic traffic and support conversion goals. The commercial fit depends on whether the requirement is a relatively contained website refresh, a complex ecommerce build or an ongoing acquisition programme.
What to include in your brief
Define CMS and ecommerce integrations, content migration, URL redirects, accessibility, Core Web Vitals targets, analytics and post-launch support. Request a separate estimate for SEO migration work and clarify how change requests affect delivery cost.
Three questions to ask before hiring
- Can you walk us through a comparable website migration and its redirect, analytics and SEO QA process?
- Who will own WordPress licences, hosting, design files and ongoing maintenance?
- How will the acceptance tests cover mobile usability, checkout or lead forms and search visibility?
Buyer watch-out
A visually strong redesign can still damage organic discovery if URL mapping, metadata and analytics are left until launch week. Insist on a written migration plan and measurable acceptance criteria.
Sources and next steps
Official agency website: Yellowball. Supporting official sources: source 1 · source 2 · source 3. Compare your requirements with other providers in Mosai’s agency directory or submit an agency brief.
Swedish source profile: View the Swedish Mosai profile. English profile planned under /en/; this draft remains unindexed until bilingual migration QA passes. No live review score is claimed here.