A new-build dirt yard: soils report, builder swales and town rules before turf goes in

01What should I read before anyone digs?

Three documents:

1. The soils report summary. Colorado requires the builder to give the buyer a summary of the soils analysis and site recommendations at least 14 days before closing (C.R.S. 6-6.5-101; not legal advice). Look for fill, swell tests and the engineer’s notes on grading.
2. The lot’s grading and drainage plan. Swales are engineered: Windsor’s drainage criteria require a subdivision’s plans to show its swales, “including side/rear yard swales,” with lengths, widths and cross-sections, and a copy goes to the Town’s file (Town of Windsor). Ask the builder for your lot’s plan and any drainage certificate. In Berthoud’s Heron Lakes, the builder must supply a certificate of drainage and topographical accuracy before a landscape contractor may start, and after that the owner and contractor are responsible for keeping the grading intact (Heron Lakes rules).
3. The HOA or metro district’s design guidelines, for the deadline and the submittal. Severance Shores asks for a drainage and grading plan showing it matches the town-approved one (Severance Shores guidelines). Johnstown posts its subdivisions’ guidelines on one PUD and design guidelines page.

Give copies to anyone who quotes the job.

02Why does the builder’s grading matter once turf is down?

Because turf doesn’t decide where water goes: rain passes through the backing and base, then follows the ground below. If the ground stops falling away from the house or along the swale, water sits against the foundation, often on clay that swells when wet.

Turf is neither planted nor paved, so keep at least the fall the builder’s plan already has.

Swales are the other half. The Colorado Geological Survey calls them shallow depressions that carry rain, snowmelt and extra irrigation water off the lot, and counts patios, fences and other obstructions that dam a lot’s drainage among the causes of swelling-soil damage. Local rules agree:

• Frederick: landscaping, “including any artificial turf,” may not change the drainage pattern or runoff in the lot’s approved grading plan (Frederick Land Use Code).
• Firestone: the drainage pattern “shall not be impeded or altered by the installation of artificial turf” (Firestone Development Code 16.6.4).
• Johnstown: North Ridge runs drainage in swales along property lines and allows no grading past a lot’s limits unless the neighbors agree. The Town keeps new patios and walks 3 feet off property lines “for required drainage” (Town of Johnstown).

So the dig for the base follows the builder’s grade down rather than flattening it, and the swale’s low line stays where it was. Turf in a side-yard swale or against the foundation is in artificial turf along the side of the house.

03Will the dirt along the house settle after the turf goes in?

It can, and a new house is when it happens. The excavation around the foundation is refilled with loose soil, and the Colorado Geological Survey says that backfill settles over the first few months or years, often enough to flatten or reverse the slope next to the house so water ponds there (CGS SP-14). An older survey guide says downspouts should carry roof runoff at least 10 feet from the house (CGS SP-11).

Under turf, that shows as a dip or standing water along the house. If water already stands against the foundation, raise it with the builder in writing before turf work starts, while the grade is plainly theirs.

Ask whoever quotes the job:

• “How will you check the backfill along the house?” Good answer: they probe or dig it, compact what’s soft, and restore the fall away from the foundation before any rock goes on.
• “Where will the downspouts empty?” Good answer: at the end of an extension that carries water past the turf and down the grade.
• “What in my soils report changes the base?” More questions are in questions to ask a turf installer.

04Which town and subdivision rules apply to a new lot?

Statewide, Colorado bars an HOA from prohibiting artificial turf in the backyard of a detached single-family home, and makes a covenant or special-district rule that prohibits backyard turf unenforceable, attached homes excepted (SB23-178). Front yards aren’t protected, and the association can still review the design (HOA approval). By January 1, 2028, every local government with zoning power must also regulate live turf grass in new residential development, each choosing its own standard (HB25-1113). Not legal advice.

Four Northern Colorado towns set planting minimums on new lots that turf can’t fill:

Subdivision guidelines go further. North Ridge allows no turf in front yards, caps irrigated turf at 40% of the rear yard, and wants living plants on at least 50% of a large lot’s landscape area within three years, artificial turf not counted. Wellington’s Buffalo Creek asks for 2,000 to 2,900 square feet of irrigated sod or drought-tolerant vegetative landscape per yard (guidelines). Timnath Lakes allows turf in rear yards only, with approval, and Kitchel Lake won’t take it in place of required front-yard sod.

Every town’s code is in our guide to artificial turf rules in Northern Colorado; layouts are in front-yard turf ideas and mixing turf, rock and plant beds.

05When does the HOA or metro district want the yard finished?

Often within months:

Review time comes out of that window: Timnath Lakes tells owners to allow up to 45 days. If the deadline lands in winter or before an installer can start, ask the committee for an extension in writing before it passes; see when to install artificial turf and how long installation takes.

A blank lot is also the one chance to plan the whole yard at once.

06Should a blank lot get sod first, or go straight to turf?

Both start with the same ground work. CSU Extension says to finish grade changes and loosen compacted soil 12 inches deep before sodding (CSU Extension), and that sod over compacted soil develops a thatch problem within a couple of years (GardenNotes #551). Sod laid now and traded for turf later has to be cut back out. In Johnstown, watering new grass takes a Town permit, and no new lawn may be established after October 15 (Town of Johnstown). The full comparison: new sod or artificial turf. The installation itself: artificial turf installation.