Nashville does not impose a dedicated DADU impact fee. Standard building permit fees through Metro Codes apply based on construction valuation. Metro Water Services may charge tap fees if a new water/sewer connection is required, and Metro Schools impact fees do not apply to single accessory units. Stormwater fees apply based on impervious surface added.
Nashville has no DADU-specific impact fee. Metro Codes and Building Safety charges standard building permit fees scaled to estimated construction cost: roughly $5.50 per $1,000 of valuation plus base fees, with separate plumbing, electrical, mechanical, and gas permit fees. Metro Water Services tap fees apply only if a new water or sewer service connection is required (typically not, since DADUs usually tie into the existing service); when needed, tap fees are several thousand dollars based on meter size. Davidson County imposes a privilege tax on new residential development (the General Educational Building Program) for new units, though small accessory units may be exempt. Stormwater management fees through Metro Water Services apply based on the impervious surface added (typically $50-$500 one-time). Property taxes increase based on the new assessed value of the DADU.
Building without paying required permit fees prevents issuance and causes stop-work orders. Failure to obtain water/sewer connections for plumbing fixtures violates Metro Water Services rules. Unpermitted construction is assessed back-permit fees and double penalties.
Nashville, TN
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Nashville, TN
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Nashville, TN
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Nashville, TN
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Nashville, TN
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Nashville, TN
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