In St. George the choice between a block wall and a wood fence usually comes down to three things: how long you plan to stay, how much upkeep you will tolerate, and where the fence line runs, because the city's front-yard rules can decide the question for you. Here is how the two compare on the numbers, followed by the rules that apply to both.
Side-by-side comparison
| Factor | CMU block wall | Wood privacy fence |
|---|---|---|
| Installed cost | $20–$35 per sq ft; about $120–$210 per linear ft at 6 ft tall | $15–$35 per linear ft |
| Estimated lifespan | 50 to 100 years (HomeAdvisor) | 15 to 30 years (Angi) |
| Routine upkeep | Occasional cleaning; patch or repaint any stucco or paint finish | Sealing every 1 to 2 years (HomeGuide), about $2–$14 per linear ft |
| Privacy and noise | Solid and continuous | Good when new; gaps open as boards shrink |
| Can it retain soil? | Yes, when designed and reinforced as a retaining wall | No |
| Permit in St. George | Required in a front setback; required for CMU retaining walls 4 ft or taller (§10-18-5) | Required in a front setback (§10-18-5) |
Vinyl sits between the two: about $24–$45 per linear foot and 20 to 30 years of life (Angi), though Angi notes UV exposure can make vinyl more brittle over time.
The real cost over time
Wood's lower price comes with a maintenance bill. HomeGuide says a wood fence needs sealing every one to two years, and staining or sealing a typical 100 to 150 foot fence costs about $300–$2,800. Over a block wall's much longer life, a wood fence may also need to be replaced outright at least once. Block asks for more money on day one and very little after that, provided it was built on a proper footing with reinforcement where the design calls for it.
When a block wall makes more sense
When a wood fence makes more sense
Rules that apply to both in St. George
A block wall used as a boundary or privacy wall is treated as a fence for height purposes. Under St. George City Code §10-18-1, most zones cap front-yard fences at 4 feet and side and rear-yard fences at 6 feet 4 inches, and within 10 feet behind the sidewalk only decorative fences that are at least 50 percent open, such as picket or wrought iron, are allowed. A permit is needed for any fence or retaining wall in a front setback, and for CMU and other retaining walls 4 feet or taller (§10-18-5). The permit guide covers the details.
Neighboring cities differ. Ivins, for example, requires CMU block colored "Sandstone" for walls along its arterial and collector streets (Ivins City Code 16.11.135). HOAs often add their own material and color rules on top of city code, so check your CC&Rs before choosing; see the HOA guide.
Questions to ask either kind of company
- For block: footing size and depth, rebar and grout spacing, cap style, and the finish (bare, painted, or stucco).
- For wood: species and grade, post material and depth, whether posts are set in concrete, and the first sealing.
- For both: who pulls the permit, how the property line was confirmed, and what the warranty covers.
Sources: cost figures from the cost guide's source list; lifespans from Angi on wood fences and vinyl fences (both updated July 9, 2026) and HomeAdvisor on block walls (updated June 20, 2026); upkeep from HomeGuide's fence cost guide (February 3, 2026) and stain cost guide (February 4, 2026); noise from the Federal Highway Administration (guidance on highway noise barriers); codes checked September 26, 2026.