The average cost of building a tennis court varies depending on the surface of the court and below is the average cost for building a set of 4 tennis courts for each surface:

Acrylic Clay: £200,000
Porous Asphalt: £150,000
Artificial Grass: £175,000
Impervious Acrylic: £175,000

The cost of renovating an existing tennis court depends on the surface of the court and the below is the average cost for each surface type:

Acrylic Clay: £17,500
Porous Asphalt: £15,000
Artificial Grass: £12,500