Most agencies won’t tell you this, because telling you costs them the project. But a significant number of the briefs that land on agency desks don’t belong there. The client needs a website. The agency quotes £12,000 / $16,000 and eight weeks. And Squarespace would have done the job in a weekend for £17 a month.
We’re not being generous here. We’re being accurate. There are projects where an agency adds genuine value, and projects where an agency adds cost, complexity and a dependency you didn’t need. Knowing which is which before you sign anything is worth more than most discovery phases.
Five projects that don’t need an agency
A brochure site for a service business. You’re a consultancy, a law firm, a therapist, a trades business, or a small professional services outfit. You need five to ten pages: who you are, what you do, how to get in touch. No bookings integration, no member login, no complex forms. Squarespace handles this. So does Webflow. The templates are good enough that most visitors won’t know or care whether a designer was involved, and the ones who notice will notice the content, not the platform.
A simple online shop with fewer than 50 products. You sell candles, prints, ceramics, subscription boxes, whatever. Shopify’s Basic plan costs £19 a month in the UK on annual billing. It handles inventory, payments, shipping calculations, tax, and abandoned cart emails out of the box. An agency will charge you £8,000 / $11,000 to £15,000 / $20,000 to build a WooCommerce or Shopify store that does the same things, then bill you a retainer to maintain it. If you’re selling 30 products and turning over less than £100,000 / $130,000 a year, the maths doesn’t work.
A portfolio or personal brand site. Photographers, architects, designers, freelance writers. Squarespace was built for this. Literally. The platform’s entire design language assumes you want to show visual work in a clean grid with minimal text. You’ll have a better-looking site on Squarespace’s free templates than most agencies would build you on WordPress for £5,000 / $7,000.
An event or campaign site with a short shelf life. You’re running a conference, a product launch, a fundraiser. The site needs to exist for three months, collect registrations, and then quietly expire. Paying an agency to build this is like hiring an architect for a garden marquee. Squarespace or Webflow, built in a day, cancelled when you’re done.
A blog or content site with no commercial integration. You want to publish articles, build an audience, and own the platform. Squarespace’s CMS is limited but functional. Webflow’s is more powerful, though the learning curve is steeper. WordPress.com (the hosted version, not the self-hosted one) sits somewhere between. None of these require agency involvement unless the content strategy itself is what you’re buying, and even then, that’s a strategist, not a web build.
What these have in common
The projects above share three traits. First, the requirements are standard. Nothing about the site does something that the platform’s built-in features can’t handle without custom code. Second, the content is manageable. You’re not wrangling 10,000 product SKUs or syncing with a warehouse management system. Third, you can maintain it yourself. Adding a page, changing a price, uploading a photo; these are things you or someone on your team will do without filing a support ticket.
When all three are true, an agency isn’t adding capability. It’s adding polish, process, and overhead. Sometimes that polish is worth it. Usually it isn’t.
What the platforms actually cost
The pricing here matters because the gap between self-serve and agency is not a rounding error. It’s an order of magnitude.
Squarespace runs from £12 a month (Basic, billed annually) to £17 a month for the Core plan, which is the one most small businesses should pick. Core gives you custom code access, integrations, and a 3% transaction fee on sales that drops to zero on the Plus plan at £29 a month. Your total first-year cost for a Squarespace Core site including a domain is around £220 / $290 (the first year includes a free custom domain on annual plans).
Shopify’s Basic plan is £19 a month on annual billing in the UK (£25 on monthly). Card processing through Shopify Payments runs at 2.0% + 25p per transaction. Add a premium theme at £140 to £300 one-off, and your first year lands around £400 to £550 / $520 to $720.
Webflow prices in USD. The Basic site plan is $15 a month (around £12) billed annually, though most business sites need the Premium plan at $25 a month (around £20), which was restructured in May 2026 to replace the old CMS and Business plans. You’ll also pay for a Workspace seat at $15 to $39 a month depending on the tier. Realistic first-year cost for a Webflow site with one editor: around £400 to £700 / $520 to $900.
Compare that with a mid-range agency build. A custom WordPress or Shopify site from a competent UK agency runs £8,000 / $11,000 to £20,000 / $26,000 for the initial build, plus £200 / $260 to £600 / $780 a month in hosting and maintenance. Your first-year total is £10,000 / $13,000 to £27,000 / $35,000.
The agency site might be better. But is it fifteen times better? For a five-page brochure site? No.
Where self-serve stops working
This isn’t an argument against agencies. It’s an argument against hiring one when you don’t need one. Here’s when you do.
When the site needs to talk to other systems. The moment you need your website to sync with a CRM, pull data from an ERP, manage complex membership tiers, or integrate with a payment gateway beyond Stripe and PayPal, you’ve left self-serve territory. Squarespace’s integration options are shallow. Shopify’s app ecosystem is broad but fragile at the edges. Webflow’s API access is improving but still assumes a developer is involved. Custom integrations need custom work.
When you’re managing hundreds or thousands of products with complex rules. Variable pricing by customer segment, multi-currency, subscription billing with metered usage, bundled products with conditional logic. Shopify can handle some of this with apps, but once you’re stacking five or six apps to approximate the behaviour you need, you’ve recreated the complexity of a custom build without the coherence of one.
When you need to control performance at scale. Self-serve platforms host your site on shared infrastructure you don’t control. That’s fine at 5,000 visitors a month. It starts to matter at 50,000. It matters a lot at 500,000. If your site is revenue-critical and performance-sensitive, you need hosting you can tune, caching you can configure, and someone monitoring uptime who isn’t you.
When accessibility, compliance, or security requirements are non-negotiable. Public sector sites in the UK must meet WCAG 2.2 AA under the Public Sector Bodies (Websites and Mobile Applications) Accessibility Regulations 2018. Financial services sites need specific security controls. Sites handling sensitive data need penetration testing and incident response plans. Self-serve platforms will get you partway, but the compliance burden sits with you, and ‘partway’ isn’t a defensible answer to an auditor.
When the site is the product. If your website isn’t a brochure for the business but the mechanism through which the business operates (a booking platform, a marketplace, a client portal, a member community with gated content and billing), you need something built for that purpose. Self-serve tools can mimic these patterns, but they creak.
The honest middle ground
There’s a version of this that agencies won’t mention and platform evangelists skip past. You can start on Squarespace or Shopify, run it yourself for a year or two, and then hire an agency when you’ve outgrown it. That’s not failure. That’s sequencing.
The self-serve period teaches you what your site actually needs to do, which pages people visit, what they ignore, and where the friction sits. A brief written after twelve months of real usage data is ten times better than one written from assumptions before launch. You’ll spend less on the eventual agency build because you’ll waste less on features nobody wanted.
We’ve seen too many businesses spend £15,000 / $20,000 on a custom site before they’ve validated the business model, then rebuild eighteen months later once they understand their customers. Start cheap. Learn fast. Invest when you know what you’re investing in.
The one thing the platforms can’t replace
Design is solvable. Templates are genuinely good now. But information architecture, content strategy, and conversion thinking are not things a template gives you. If you’re building a Squarespace site yourself and you find that nobody fills in your contact form, that visitors bounce from your services page, or that your shop gets traffic but no sales, the platform isn’t the problem. The thinking behind the site is.
That’s where a consultant, a UX specialist, or yes, sometimes an agency, earns their fee. Not by building the site. By working out what should be on it. That’s a different brief, a different budget, and a different conversation.
