Website Design
Brand-led interfaces with real hierarchy. Wireframes, design system, and pixel-tight pages built to convert, not just to look nice.
- UX & information architecture
- Design systems in Figma
- Conversion-first layouts
Design · Development · SEO / AEO
Websites built on
a theory that works.
Build Theory designs and develops sites that load fast, read clearly and get found — by search engines and by the AI assistants your customers now ask first.
- 0.9s
- Median load time on builds we ship
- 3.4x
- Average lift in organic entries after 6 months
- 100/100
- Typical Lighthouse accessibility score
Centered Spa
Three disciplines, one team
Design, build and visibility handled together — so nothing gets lost in the handover.
Development
Fast, accessible, maintainable builds. Modern stacks, clean code, and a CMS your team can actually use without calling us.
- React / headless builds
- Core Web Vitals tuning
- CMS & integrations
SEO & AEO
Rank in Google and get cited by ChatGPT, Perplexity and AI Overviews. Technical foundations plus content built to be quoted.
- Technical SEO & schema
- Entity + topical authority
- AI answer visibility tracking
How we work
01
Diagnose
Audit the site, the search landscape and how AI engines currently answer questions in your category.
02
Design
Structure, wireframes and a visual system agreed before a line of production code is written.
03
Build
Shipped in weeks, not quarters. Performance, accessibility and schema baked in from day one.
04
Grow
Ongoing content, technical SEO and AEO work with monthly reporting on rankings and AI citations.
Our work
Pick a discipline to see the portfolio.
Questions, answered
What exactly is AEO?+
Answer Engine Optimisation is the practice of making your content easy for AI assistants — ChatGPT, Perplexity, Gemini, Google AI Overviews — to understand, trust and cite. It leans on structured data, clear entity definitions and genuinely useful answers rather than keyword stuffing.
How long does a website take?+
A focused marketing site typically runs 4–6 weeks from kickoff to launch. Larger builds with custom functionality or migrations usually land between 8 and 12 weeks.
Can you work with our existing site?+
Yes. Plenty of engagements start as a technical SEO and performance rescue on an existing site, then grow into a redesign once we know what's actually driving results.
Do you offer ongoing support?+
Most clients stay on a monthly retainer covering content, technical maintenance and search/AI visibility reporting.
Let's build the theory
Tell us about your project and we'll send back a free audit of your current site, search visibility and AI answer presence.
hello@buildtheory.co