Plain English for web build terms.
Every term a UK small business is told to care about — bespoke, Core Web Vitals, Lighthouse, LCP, INP, CLS, Next.js, WCAG, llms.txt — defined in one or two honest sentences, with a real example and why it matters.
Bespoke website
Designed from scratch for one business, hand-coded, and owned outright. Not a template with a custom logo on top.
Flat-fee web design
One agreed price for a defined deliverable. No hourly clock, no £1,500-a-month retainer, no change-order drama.
Seven-day build
Brief Monday, launch Sunday. One person, one site, one sprint — with a fixed deadline nobody can slip.
Website ownership
Three accounts decide who really owns your site — code, domain, hosting. Anything short of all three is rent.
Core Web Vitals
Three numbers — LCP, INP, CLS — that Google uses to judge real-world page speed. Passing them is a ranking signal.
Lighthouse score
Chrome's free 0-to-100 audit across Performance, Accessibility, Best Practices, and SEO. Shorthand for ‘is this well-built’.
LCP (Largest Contentful Paint)
Largest Contentful Paint — how long the biggest visible element takes to render. Google's threshold is 2.5 seconds.
INP (Interaction to Next Paint)
Interaction to Next Paint — how responsive the page feels when you click or tap. Google's threshold is 200 milliseconds.
CLS (Cumulative Layout Shift)
Cumulative Layout Shift — how much the page jumps around while loading. Google's threshold is a score of 0.1.
Next.js
Vercel's React framework — the default professional choice for marketing sites, dashboards, and content-heavy apps in 2026.
Jamstack
Pre-built HTML, served from a CDN, with dynamic behaviour added via APIs. Fast, cheap to host, and hard to attack.
Headless CMS
A CMS that serves content via API, no templates attached. Pairs well with Next.js — overkill for most three-to-ten-page sites.
Missing a term? Email hello@1weeksites.com — new terms get added weekly. Meanwhile, read the properly-built guide for how these terms come together on a real site.