The skip company has a rate for a specific size of skip. If you make the skip whatever size suits using doors etc to increase the capacity of the skip then the charging system is useless and profitless, hence the skip company refusing to lift the skip. ‘Fill level’ isn’t the guy that painted it!!!
Around here the average skip price is £160, landfill gas and tipping charges are around £100. In order to avoid landfill charges waste segregation and recycling are necessary this is quite labour intensive and costly so no matter how you look at it margins are tight, hence the ‘we won’t lift an overloaded skip’ stance.
Its usually the hirers responsibility to ensure that the skip is correctly loaded and it wouldn’t be good practice for a waste company to allow one its vehicles to carry an overloaded container on the highway as VOSA and/or the police would charge the driver for carrying an insecure load at the very least.