Every agency shortlist looks the same by the second meeting.
Similar portfolios, similar language, similar reassurance about partnership and process.
The differences that matter are not in the pitch. They surface in what an agency can show you when asked a direct question, and in what they quietly avoid answering.
Choosing a web design agency Cotswolds businesses can rely on gets considerably easier once you know which five things to check. None require technical knowledge. All of them can be done before you sign anything.
Web Design Agency Cotswolds: Five Red Flags to Spot Early
Red flag one: no performance evidence from real work
Ask for page weight and Core Web Vitals figures from three sites they have built, with the test conditions stated.
A web design agency Cotswolds that measures will have these to hand or can produce them in an afternoon. One that does not will offer awards, testimonials or a case study describing a site as “lightning fast” without a number attached.
Then test their own website while you are on the call. It takes a minute and it is remarkable how often the result contradicts the pitch.
Red flag two: vagueness about who owns what
Ask directly: if we part company in two years, what do we take with us?
You want the code, the content, the domain and a site another developer can maintain. What you do not want is a build locked to a proprietary page builder only that agency understands, or a domain registered in their name, or a hosting arrangement you cannot exit.
An agency comfortable with this question answers it plainly. Evasion here is the single most expensive warning sign on the list, because the cost arrives later and by then you have no leverage.
Red flag three: accessibility as an afterthought
Ask which WCAG level they build to, how they test, and whether they have run a session with someone using assistive technology.
“We follow best practice” is not an answer. “We build to WCAG 2.1 Level AA, we test with keyboard and zoom, and we run automated checks knowing they catch only part of it” is.
This matters commercially as well as ethically. Accessibility appears in public sector and larger corporate procurement, and retrofitting it later costs several times more than building it in.
Red flag four: no measurement after launch
Ask what happens in month three.
Many agencies deliver a site and disappear until the next project. Websites regain weight through ordinary content work, so a site with no review cadence degrades quietly and predictably.
You are looking for a baseline recorded at launch and a plan to measure against it. Without the baseline, nobody can tell whether the site is getting slower or you are imagining it.
Red flag five: guarantees nobody can make
Rankings cannot be guaranteed. Neither can conversion uplift, nor a precise carbon reduction.
An agency offering all three is telling you how they operate. Environmental claims in particular need to be accurate and substantiated, and an agency that hands you “carbon neutral website” wording is creating exposure for you rather than for themselves.
What a credible agency will say is what they will measure, what they expect to improve, and what remains outside their control. Where performance and environmental impact both apply, they should describe them as the same delivery lever: reducing unnecessary data transfer and processing supports a faster experience while lowering estimated digital carbon, with those environmental figures acknowledged as modelled rather than directly measured.
The awkward question worth asking
Ask what work they have turned down, or when they last talked a client out of something.
An agency with actual standards has an answer. One that has never said no to a client request has been building whatever was asked for, which is how sites end up with four megabytes of features nobody uses.
Our sustainable web design work leads with measurement, and we would expect you to put every question on this page to us.