The baseline budget for bbc.co.uk for 2008-9 is £114.4 million1. Even spread over two hundred sites, that’s a lot. If you are in an average SME, you probably just want a rough guide to start with without having to read through everything below, so consider 7.5% of web turnover with a minimum of £3000pa.
Entry level websites are particularly hard to quantify because so much depends on whether or not you have any kind of existing design style. Moving on quickly to what's more 'normal' for us these days: a finger-in-the-air estimate for the design component of a typical content-managed website - ie one where you can update at least some part of it yourself - will be between £1000 and £2000 for a treatment followed by £3000 to £8000 for its execution. Though clearly if the website is particularly large or complex the figures will rise accordingly.
Now that's out of the way, time to get down to business. There are a lot of factors that need to be considered:
One of the really good things about a website is that you can build it up over time. You don't have to meet all your costs at once.
If you replace the word website with the word shop in your thinking, then you will quickly realise (if you haven't already) that the costs and risks of a website are far, far lower.
Three to five years usually, though one for a specific event eg a one-off festival will obviously be much shorter. Websites that go stale - ie no change of content for months on end - tend to fall down the search engine rankings because they are perceived to be of less value. The reverse is also true: fresh websites go up the scale.
This is probably the more important question than how much it costs. Even with our entry-level commerce systems, some of our clients are enjoying substantial web sales - some measured in hundreds of thousands pa. However, success also brings criticality and the whole chain of website into the back office has to be made reliable and resilient - this requires proper investment.
1 source: BBC Trust - Service Review p16
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