Two websites can look the same on launch day and cost completely different amounts to change a year later. What separates them is not the design and it is rarely the platform. It is how much of the site is bespoke.
Every bespoke part is a thing only its author fully understands. That is fine while the author is available and expensive the moment they are not, because the next person has to read the code before they can quote the change. Standard parts are the opposite: dull, documented, and replaceable by anyone.
So the useful question is not custom against template. It is which parts genuinely need to be built, and which should be boring on purpose. A booking flow that is central to how the business earns is worth building. A team page that was built from scratch because the developer preferred it is a maintenance cost with no return.
That decision is invisible in a proposal. Two quotes for the same site can differ by a factor of three and neither will say which parts are bespoke, which is why we write it down before anything is built and why the architecture decision is a milestone rather than an assumption.
If what you are choosing is a supplier rather than an approach, web design answers that question directly. If people will log in and see different things, you are describing a platform, and web portal development is scoped differently. Where the site has to sell, e-commerce owns that decision. Being found is a build decision rather than a later project, which is why SEO runs alongside development rather than after it, and the full set is under our services.