Who has to follow St. George's lawn limits?
City Code 10-23-3 covers new development and remodels that make a home's footprint bigger1. The city's landscape form says the rules took effect July 28, 20222. The duty to finish and maintain landscaping applies to every residential property1. A 2022 news report said the new ordinances don't apply to existing homes3.
The water district's 2023 standards say they cover new landscape installations and rehabilitations4. If you're redoing a whole yard on an older home, ask the city which rules apply before you design it.
How much lawn can a new St. George home have?
Lawn can't exceed 8% of the lot, up to 1,500 square feet for lots up to 20,000 square feet. Bigger lots can have up to 2,000 square feet. Lots under 7,500 square feet can have up to 600 square feet even when that's more than 8%2. The table below runs the numbers for common lot sizes.
| Lot size | 8% of the lot | Lawn allowed |
|---|---|---|
| 6,000 sq ft | 480 sq ft | 600 sq ft (small-lot allowance) |
| 10,000 sq ft | 800 sq ft | 800 sq ft |
| 15,000 sq ft | 1,200 sq ft | 1,200 sq ft |
| 20,000 sq ft | 1,600 sq ft | 1,500 sq ft (cap) |
| 30,000 sq ft | 2,400 sq ft | 2,000 sq ft (large-lot cap) |
Next door, Washington's version has no large-lot step: no lot there may have more than 1,500 square feet of grass5. See Washington's lawn rules if you're building there.
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Lawn is banned in park strips, in any landscape area less than 8 feet wide, and on slopes steeper than 15%2. The code measures slope as rise over run in percent, so a 15% slope climbs 15 feet over 100 feet6. Those spots need a non-lawn plan from day one, such as plants, landscape rock or pavers.
If you live in an HOA, state law also bars HOA rules that restrict converting a grass park strip to water wise landscaping7.
How does turf fit the front yard rule?
At least 30% of a new home's front yard must be landscaped, and at least half of that landscaped area must be live vegetation2. The code defines lawn as land planted in closely mowed, managed grasses, and artificial turf as synthetic grass used in lieu of lawns6. So turf isn't capped as lawn, but it can't count toward the live vegetation half.
The code's definition of landscaping lists plants, rock, stone, wood chips and permeable rock cover, and it doesn't mention artificial turf6. If you want turf in a new front yard, ask the city how it counts toward the 30% before you finalize the plan. The 30% rule covers the front yard only2, so artificial turf in a backyard or play area doesn't run into it.
Can you change an approved landscape plan later?
Only with the city's OK. For new homes, the approved landscape plan is recorded against the property, and if the landscape changes, a new plan must be submitted, approved and recorded2. The code makes it unlawful to modify an approved plan without written permission, and shrinking the landscape area counts as a modification1.
Swapping a plant for the same type of plant is maintenance, not a modification1. Bigger changes, like replacing a planted area with turf or pavers, are the kind to clear with the city first.
Can an HOA ban turf or make you keep grass?
Utah law says an HOA can't enact or enforce rules that prohibit water wise landscaping on a detached home's lot. It can still require site plan review, healthy plants and design rules, including limits on mulches it considers detrimental to its operations8. The law doesn't name artificial turf, so read your HOA's rules and ask before you sign a contract.
- An HOA can't require lawn in an area less than 8 feet wide, except where it's reasonably needed for erosion control8.
- HOA rules can't restrict converting a grass park strip to water wise landscaping7.
- The water district says HOAs usually can't force you to keep grass, and it will reach out to an HOA that tries9.
What changes in ultra water efficient neighborhoods?
Some new development follows the district's May 2025 Ultra Water Efficiency Standards. They apply to development served directly by the district and to areas where a city adopts them10. Irrigated lawn is prohibited outside community recreation areas, irrigated landscaping is capped at 2,000 square feet per home, spray irrigation is banned, and private swimming pools aren't allowed10.
A community association set up by the developer enforces these rules, and surcharges apply to water use above 8,000 gallons a month10. Private yards in these areas rely on plants on drip, rock and other surfaces that aren't lawn. For rebate rules, see how the district rebate works.
How we checked this
St. George's official code site, stgeorge.municipal.codes, blocked automated reads when we checked on October 21, 2026, so we read sections 10-23-3 and 10-2-1 on the Zoneomics code mirror, which lists amendments through Ord. 2024-016 of March 21, 202416. We cross-checked the lawn limits against the city's own Landscape Certification and Acknowledgment form, revised August 20222. HOA rules come from the Utah Code on le.utah.gov87, and district rules from its 2023 and 2025 standards410. Confirm current rules with the city before you build.