I haven't added it all up yet but a ball park figure would be around £15K inc vat. That includes the base but doesn't include any labour (I don't get paid). The best price I got for a 18 x 9 meter insulated metal building was £26K + vat + erection +nets + plant hire + concrete base.
This has just surprised me. I thought I might as well move on some of the old heaters and did a quick inventory.
7 - 1.5kw infra red wall heaters
2 - 30000btu propane space heaters
2 - 2.8kw oil filled radiators
1 - 1.5kw oil filled radiators
2 - Electric fan heaters
2 - Calor gas fires
1 - Andrew Sykes 30kw diesel space heater
1 - Trotek 20kw indirect diesel space heater
1 - Arcotherm EC85kw indirect diesel space heater
1 - ZM 20kw Infrared diesel space heater.
With the exception of the ZM every one has been purchased over the years to keep her warm