cost of foundations for extension
Down south I've recently dug my own foundations for a 4m x 4m extension. Hire of digger, removal of soil (3 times what you dig out in volume!!), concrete readymix and oversite including DPM, insulation etc cost me approximately Â£1500.I had to dig down and have 1m footings 600mm wide.ire of digger, removal of soil (3 times what you dig out in volume!!), concrete readymix and oversite including DPM, insulation etc cost me approximately Â£1500. I had to dig down and have 1m footings 600mm wide.