Upgrades based on guidelines, recommended practices or other non-mandatory provisions are ineligible, as is added capacity for population growth. Extra work a permitting agency requires is eligible only if it meets four narrow conditions.
The permit and the permitting agency’s written requirement, plus evidence it is applied uniformly to similar projects.
A permitting officer’s discretionary recommendation, such as “build a bridge instead of the culvert,” isn’t a code. Without a written, adopted standard, the extra cost is yours.