Accessory Structures in Ascension Parish, LA (2026)
3 rules for unincorporated Ascension Parish, Louisiana.
Verified from official government sources
ADU Rules
Ascension Parish's Unified Land Development Code lets a landowner in unincorporated Ascension Parish place a secondary single-family residence on the same lot for immediate family, defined as children, grandchildren, parents or grandparents, without exceeding the district's normal density, except in Conservation districts where one secondary residence per half-acre is allowed.
Secondary Family Residences on One Lot
Some RestrictionsAscension Parish UDC § 17-2041
A.Secondary single-family residences may be located on a single lot for immediate family members of the owners. Immediate family members shall include the children, grandchildren, parents, and grandparents of the owner. Such secondary occupancy shall not, however, exceed any density contemplated in a land use district, with the exception of conservation districts where the density requirement s...
ADU Impact Fees
In unincorporated Ascension Parish, adding a secondary family residence, such as an in-law suite for a parent or grandparent, up to 1,000 square feet is exempt from the parish's transportation impact fee under Code § 19-50(b)(2), so long as it houses an immediate family member and stays within the density allowed in the land use district.
Ascension Parish Waives Impact Fee For In-Law Additions
Light RestrictionsAscension Parish Code §§ 19-48, 19-50(b)(2)
Secondary family residence. Secondary family residences may be located on a single lot for immediate family members of the owners. Immediate family members shall include the children, grandchildren, parents, and grandparents of the owner. ... (b)Exemptions. The following types of development shall be exempted from payment of all transportation impact fees otherwise due pursuant to the ordinance...
Shed & Carport Rules
A detached tool shed, storage building or similar accessory structure in unincorporated Ascension Parish can go up without a building permit only if it is one story and its floor area does not exceed 400 square feet. Ascension Parish Code § 6-5(501)(1)(a) sets that threshold; anything larger, or with a second story, needs Building Official approval before construction.
Ascension Parish Shed & Accessory Building Rules
Some RestrictionsAscension Parish Code § 6-5(501)(1)(a)
Permits shall not be required for the following: ... (1)Building.a.One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area is not greater than four hundred (400) square feet (thirty-seven (37) meters squared).
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