I used to have a small industrial unit of some 400sqft. It cost £300 per month for rent, then I had to pay for the water (on a meter), the electric at £18 per month as the standing charge was 40p per day!! The landlord charged me £40 per month insurance for buildings and contents. The rates were based on the rateable value for the premises (higher if they are in a good area or new business park). Full rates were £150 per month but I go a 50% rebate for being a small business and just moving in from the Council.
Total cost per month was £433 per month - That's more than 50 semis cleaned per month.
Now I have a corner of a barn and my garage costs me £60 per month.