The best web development agencies
A web development agency builds and maintains the public side of a business: marketing sites, storefronts, portals and the integrations behind them. The label covers everything from a two-person studio to a hundred-strong shop, which is why the first job is deciding what you actually need.
What this category covers
- Marketing sites and content platforms where speed, accessibility and editorial workflow matter more than custom logic.
- E-commerce builds on a hosted or headless stack, including payment, tax and fulfilment integrations.
- Customer portals and account areas that sit on top of an existing back office.
- Design systems and front-end rebuilds where the back end stays as it is.
What separates a good supplier from an average one
Ask for three projects on the same framework and CMS you plan to use. Adjacent experience is not the same thing: a team fluent in one ecosystem can spend the first two sprints of your budget learning another.
Find out who writes the code, where they sit, and how many other projects they are on. The strongest predictor of a slipped deadline is a lead engineer split across three accounts.
Repositories, cloud accounts, domains and design files should be in your name from day one. Agencies that hold infrastructure rarely mention it in the proposal.
A build that passes review on a developer laptop and fails on a mid-range phone is not finished. Put performance budgets and an accessibility level in the contract, not in the kickoff deck.
Ask what the first six months cost. Support, dependency updates and small changes are where most of the lifetime bill sits, and where cheap build quotes get expensive.
Questions worth asking before you sign
- Which parts of this scope have you built before, and which are new to your team?
- Who exactly is assigned, at what percentage, and for how long?
- What is your definition of done for a page: which browsers, which devices, which performance budget?
- How do you handle scope changes mid-sprint, and what does that do to the date?
- If we part ways after launch, what do we receive, and how long does the handover take?
Realistic timelines
| Type of engagement | What to expect |
|---|---|
| Marketing site, 10 to 25 pages | Six weeks to three months. The variable is content readiness, not code. |
| E-commerce on a platform | Two to four months. Integrations with stock, tax and fulfilment drive the number more than the storefront does. |
| Custom portal | Four months and up, with discovery paid separately. Fixed-price quotes without discovery are guesses. |
Common questions
Is a bigger agency safer?
Bigger buys continuity when someone leaves, and a process that survives holidays. It also buys account managers and slower decisions. For a project under three months, a small senior team usually delivers more per pound.
Should design and build be one contract?
Splitting them works when the design partner produces a real component library rather than a set of pictures. If the handover is a flat mockup with no states, the build team will redesign it anyway, and you pay twice.
How do we compare proposals with very different numbers?
Normalise them. Ask every bidder to price the same scope, the same acceptance criteria and the same six months of support. Most of the spread disappears once support sits inside the number.