Just wanted to get the collective thoughts of whether it is worth the cost savings to do soakwells after handover. Both from a practical and safety pov. I have the time to do it so that isn't an issue. I originally had a $4k PS that was increased to$ 6k as I need 4 soakwells not 2 as originally planned by the builder in line with the CIty of Armadale (Perth based). GIven this the sales rep reckons it'll come close to $6k at completion with the builder and advised his mate did them for 3.5k cash, 4k any other payment method. That said I've obtained other soakwell company quotes via google (went with a few of the major ones popping up) and i'm getting around 3.5k + gst for one option that also does 4 poly soakwells, same size: 1500 x 900. My main concern is, given the builder wont allow slab down installation of soakwells by a third party, is there much risk to footings, utility connections etc by having a soakwell contractor do them after handover? I only have a 4.5 m front setback and 15m or so wide frontage, not alot of room to move on the front given one soakwell the builder drafted below the driveway would have to be relocated. My main concern is footings and something happening to the general building (paranoia as I've never done this before) - but hear of people even doing the old 10,20 x small bunnings soakwells to their own home with their family members over a weekend. Would appreciate anyone who has also developed or done alot of building - is there anything I'm not considering? One soakwell contractor quoted me the 4 x 1500 x 900 soakwells all out the front. Another 30 x small ones dotted around the sides, back and front. Is there a right or wrong?? What should I go with? My block is going to be utilised to the minimum side/back setback requirements so not much room for movement or a safety net to my block if they install wrong?? WIll insurance cover me if i insure my house and the contracted soakwells cause footings or the house to fall over in 7 years time? OTherwise one benefit i assume of going down the builder installed path is they do both the building and soakwells and so there's no blame shifting down the track if... touchwood, anything goes wrong?