Septic System Costs for New Single Family Home

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I am planning to build a new construction SFH in Tennessee and was curious how much I should budget to purchase and install a conventional septic system? I have heard numbers from $6K-$15K. We want to make sure our budget is as close to the final number as possible. Thanks for your help!


It's best to get the county to do a soil analysis which should be a requirement.  Once that is complete, you can send to a couple of septic installers to get some bids.  Conventional and chamber systems are the most affordable.  Here in NC, I normally spend approximately $4500 for either but if the soil is poor if you have limited space, it could get a lot more expensive.