🧱 Retaining Wall
A wall holding back soil where grade changes — height triggers engineering and permit thresholds.
Permit requirements for Retaining Wall differ by state and city. The table below summarizes the rule in each covered state — open a state for full detail, fees, and official sources.
| State | Permit? | Authority | Typical fee | Timeline | Go / No-Go | Key notes |
|---|---|---|---|---|---|---|
| California | Conditional | city | No fee under the exemption; a permit applies if over the threshold. | 2–4 weeks if required. | Generally allowed | Walls over 4 ft or supporting a surcharge (deck, vehicle, structure) require design and a permit. Exempt: Retaining walls ≤4 ft (measured bottom of footing to top), not supporting a surcharge, are exempt (CBC R105.2). |
| Texas | Conditional | city | No fee under the exemption; a permit applies if over the threshold. | 2–4 weeks if required. | Generally allowed | Taller walls or walls supporting a surcharge (driveway, structure, slope above) require design and a permit. Exempt: Retaining walls not over 4 ft (bottom of footing to top) are exempt (Dallas; IRC 105.2). |
| Florida | Conditional | city | No fee under the exemption; a permit applies if over the threshold. | 2–4 weeks if required. | Generally allowed | Taller or surcharge-supporting walls need design and a permit. Exempt: Retaining walls ≤4 ft (bottom of footing to top), not supporting a surcharge, are exempt (FBC R105.2). |
| New York | Conditional | city | No fee under the exemption; a permit applies if over the threshold. | 2–4 weeks if required. | Generally allowed | Taller or surcharge-supporting walls need design and a permit. Exempt: Retaining walls ≤4 ft (bottom of footing to top), not supporting a surcharge, are exempt (RCNYS R105.2). |
| Pennsylvania | Conditional | city | — | — | Generally allowed | Height and whether the wall supports a surcharge (driveway, structure, or slope above) determine the permit threshold. Verify with your municipality. |
| Illinois | Conditional | city | — | — | Generally allowed | Height and whether the wall supports a surcharge (driveway, structure, or slope above) determine the permit threshold. Verify with your municipality. |
| Ohio | Conditional | city | Columbus minimum permit fee $125 where a permit is required. | — | Generally allowed | Height and whether the wall supports a surcharge (driveway, structure, or slope above) determine the permit threshold. Verify with your municipality. |
| Georgia | Conditional | city | Atlanta minimum permit cost $150 plus $25 fee where a permit is required. | — | Generally allowed | Height and whether the wall supports a surcharge (driveway, structure, or slope above) determine the permit threshold. Verify with your municipality. |
| North Carolina | Conditional | city | Building permit where required; verify with the city. | 1–3 weeks; walls over threshold may need engineered drawings. | Generally allowed | Retaining walls holding more than 48 in of fill (measured bottom of footing to top of fill) require a permit and often professional design. Check HOA too. Exempt: Charlotte/Cary: walls retaining >48 in (4 ft) of fill require a permit. |
| Michigan | Conditional | city | Building permit where required; verify with the city. | 1–3 weeks; walls over threshold may need engineered drawings. | Generally allowed | Retaining walls holding more than 4 ft of fill require a permit and often professional design. Check HOA and drainage too. Exempt: State R105.2 exempts retaining walls ≤4 ft measured from bottom of footing to top (unless supporting a surcharge). |
| New Jersey | Conditional | city | Construction permit where required; verify with the city. | 1–3 weeks; walls over threshold may need engineered drawings. | Generally allowed | Retaining walls over ~4 ft require a UCC construction permit and often professional design. Check HOA and drainage/erosion rules. Exempt: Newark: retaining walls over 4 ft require a UCC construction permit. |
| Virginia | Conditional | city | Building permit where required; verify with the city. | 1–3 weeks; walls over threshold may need engineered drawings. | Generally allowed | Retaining walls holding more than 3 ft of unbalanced fill require a permit and often professional design. Tiered walls have special rules. Check HOA too. Exempt: VUSBC exempts retaining walls supporting <3 ft (36 in) of unbalanced fill. Over 3 ft requires a permit. |
| Washington | Conditional | city | Valuation-based when over the height threshold. | Over-threshold walls need plan review. | Generally allowed | Walls in Environmentally Critical Areas need a pre-application site visit. Exempt: Walls <4 ft from bottom of footing are generally exempt. |
| Arizona | Conditional | city | Valuation-based when over the height threshold. | Over-threshold walls need plan review. | Generally allowed | Walls in hillside/overlay zones have stricter rules. Exempt: Walls ≤30 in above grade and not supporting a surcharge are often exempt. |
| Massachusetts | Conditional | city | Valuation-based when over the height threshold. | Over-threshold walls need plan review. | Generally allowed | Walls in wetland or steep-slope areas may trigger additional review. Exempt: Walls <4 ft from bottom of footing to top are exempt (780 CMR R105.2). |
| Tennessee | Conditional | city | Valuation-based when over the height threshold. | Over-threshold walls need plan review. | Generally allowed | Walls in steep-slope or karst/expansive-soil areas may trigger soils review. Exempt: Walls ≤4 ft (Nashville) / ≤3 ft (Memphis) are exempt unless supporting a surcharge. |
| Indiana | Conditional | city | — | — | Generally allowed | Height and whether the wall supports a surcharge (driveway, structure, or slope above) determine the permit threshold. Verify with your building department. |
| Missouri | Conditional | city | No fee under the exemption; a permit applies if over the threshold. | Varies by municipality — if required, typically several weeks. | Generally allowed | Walls over 4 ft or supporting a surcharge require design and a permit. Verify with your municipal building department. Exempt: Retaining walls ≤4 ft (not supporting a surcharge) are exempt under the locally adopted IRC R105.2. |
| Maryland | Conditional | city | — | — | Generally allowed | Height and surcharge determine the threshold. Annapolis requires sheeting/shoring permits for adjacent excavations. Verify with your city. |
| Wisconsin | Conditional | city | No fee under the exemption; a permit applies if over the threshold. | Varies by municipality — if required, typically several weeks. | Generally allowed | Walls over 4 ft or supporting a surcharge require design and a permit. Verify with your municipal building inspection department. Exempt: Retaining walls ≤4 ft (not supporting a surcharge) are exempt (UDC references IRC R105.2). |