Most businesses commission a website once every four or five years, which means you are making an expensive decision without much practice at making it.
Agencies make that harder rather than easier. The language is near-identical across every proposal, the portfolios all look competent, and the things that separate a site that works from one that merely launches are invisible until months afterwards.
This is a buyer’s guide to web design Cheltenham businesses can use before signing anything. Five decisions, in the order they actually matter.
What is the site for?
Answer this before looking at any agency.
A site that exists to generate enquiries is a different build from one that sells products, which is different again from one that supports existing customers. Trying to do all three equally well usually produces a site that does none of them clearly.
Name the single most valuable action a visitor can take. Every design decision afterwards should defer to it.
Mobile is the primary experience
A meaningful share of your visitors arrive on a phone, frequently outdoors and often on variable signal.
Design for that first rather than adapting to it. Test on a real mid-range device on mobile data, not a desktop browser window made narrow, because the narrow window still has your office broadband behind it.
The essentials should need no scrolling: what you do, where you are, and how to make contact. Someone deciding in the moment will not explore.
If you sell online, plan the checkout
eCommerce changes the brief considerably. Product photography is the content rather than decoration, so it needs serving properly: correct dimensions, modern formats, lazy loading below the fold and zoom images loaded on interaction rather than on arrival.
Guest checkout matters. Forcing account creation adds a step at the moment of highest purchase intent, which is precisely where friction costs most.
Test the whole flow on a phone on a poor connection. Checkout is the journey most often built on a desktop and least often tested anywhere else.
Accessibility, from the start
Work towards WCAG 2.1 Level AA. Contrast that survives daylight, keyboard operation throughout, descriptive links and error messages that explain the fix.
Built in, it is a modest share of the project. Retrofitted, it costs several times more because the fixes touch markup, components and content together.
If you tender for public sector or larger corporate work, this appears in procurement questionnaires directly, so it is commercial as well as right.
What happens after launch
This is the decision most buyers skip and most regret.
Sites gain weight and security exposure through ordinary use, mostly through images uploaded straight from a phone and plugins added to solve problems that later disappear.
Agree before launch who updates, who backs up, who reviews, and what it costs. Ask for a baseline recorded at launch: page weight, request count and Core Web Vitals under stated conditions. Without it nobody can tell later whether the site is degrading or you are imagining it.
Where performance and environmental impact both apply, treat them as the same lever: reducing unnecessary data transfer and processing supports a faster experience while lowering estimated digital carbon, though those environmental figures remain modelled rather than directly measured.
Before you sign
Ask for live URLs rather than screenshots, and open them on your phone. Ask what you take with you if you leave: the code, the content, the domain, and a site another developer can maintain.
And treat any guarantee about search rankings as disqualifying. Nobody controls them, and a willingness to promise them tells you how other claims will be handled.
Our sustainable web design work begins with measurement so you can see the trade-offs before committing to them.