The midpoint of this price range would give the company a market capitalisation on flotation of £365m.
As previously reported, HSS expects to raise gross proceeds of £103m through the issue of new shares. This will be used to pay down debt and fund capital expenditure.
Final pricing is expected to be announced on or around 4th February 2015. Dealing of share on the London Stock Exchange is expected to start on 9th February.
Chief executive Chris Davies said: “With a proven business model and a clear strategy for growth, we are excited about our future as a listed business.”