Looking at the cost of stadia ten years ago, it absolutely crushes me to see the figures bandied about now.
What changed? Why would a new Anfield cost TEN times more than St Marys in Southampton?
Numerous things:
Location. This is a big one. It raises issues for planning and working hours. Getting materials into the area and putting them up. Getting surplus out of the area
Ground Conditions. If you are building in a field that hasn't been built on you are less likely to hit something in the ground
Labour and Plant increases. Supply and demand. 5 years ago Tata (or Corus as it was) were giving you 9 weeks lead in for steel. Costs increased through demand. Now though - the demand is less mind.
Health and Safety. Consistently changing - changes the way you build things in a safe manner
Environment & Sustainability. New buildings are categorised to monitor what emissions they give out. The cost of achieving BREEAM ratings is quite significant
Quality. Not sure of the St Mary's quality - never been there. But as an example, if a stadium is built as a metal box with cladding, composite cladding costs around £60/m2 with rails. Insulated block and single skin cladding will cost similar. If it is built from cavity wall (brick - ins cavity - block) you are talking more like £100-£110 depending on brick quality. Consider the amount of brickwork at Anfield and it is easy to see why costs can differ. Again, planning will be a driver to this.
Inflation. Cost of living increases each year. Inflation in building used to be circa 2.5% a year. So 25% increase is potentially due to this.
Infrastructure. Might also be a big cost. When we increase the size of something we naturally increase the demand for things that drives it. i.e. Electricity and Power. If this is available within the existing grid - fine. If not, then we need to provide it which means new mains branches and substations.
Procurement. Who owns the risk of the cost? Contractor or LFC?
The other thing is, what is included within the St Mary's stadium and what is included in our estimate of £400m? Hotels, conference facilities, transport infrastructure etc etc. We could easily be comparing apples with oranges