How Long Does It Take to Build a Website? A Realistic UK Guide

One of the most common questions business owners ask when starting a web project is: how long will it take? The honest answer is that it depends — but that’s not a cop-out. Understanding the factors that affect timelines helps you plan properly and avoid the frustration of a project that drags on for months.

This guide covers realistic timelines for different types of websites, the stages involved, and — crucially — the things that most commonly cause delays.

Typical Timelines by Site Type

A simple brochure website — five to ten pages, no e-commerce, minimal custom functionality — typically takes four to eight weeks from kickoff to launch. That assumes prompt content supply from the client and a relatively straightforward approval process.

A medium-complexity site with a blog, contact forms, integrations (such as a CRM or booking system), and more pages typically takes eight to twelve weeks. The additional functionality requires more scoping, development, and testing time.

A full e-commerce build — product catalogues, payment gateways, inventory management, user accounts — usually takes twelve to twenty weeks or more, depending on the number of products and the complexity of the checkout and fulfilment process.

Custom web applications or platforms sit outside these ranges and require bespoke project planning. These are typically scoped in sprints rather than a single fixed timeline.

The Stages of a Web Project

Discovery and planning (one to two weeks): the agency gathers requirements, reviews your existing content and assets, and agrees on a site structure and functionality specification.

Design (two to four weeks): wireframes and visual designs are produced and approved. This stage often takes longer than expected if client feedback is slow or requires multiple revision rounds.

Development (three to eight weeks): the approved designs are built out. Integrations, forms, CMS configuration, and responsive behaviour are all handled here.

Content population and testing (one to two weeks): content is added, the site is tested across devices and browsers, and any bugs are resolved.

Launch and post-launch (one week plus): the site goes live, DNS is updated, and the agency typically monitors for issues in the days following launch.

What Slows Projects Down

The single biggest cause of delays is content. If you haven’t prepared your copy, images, and branding assets before the project starts, the build will stall waiting for them. Many agencies now charge for content delays or build holding time into their contracts.

Decision-making is the second most common bottleneck. If sign-off requires multiple internal stakeholders, build review time into your planning. Design rounds that take two weeks to turn around compound quickly across a project.

Scope changes mid-project are the third major cause. Adding a page, changing a feature, or switching platforms halfway through resets parts of the project. Every scope change should be formally agreed and its impact on timeline and cost acknowledged.