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A louvered pergola covering an outdoor kitchen and bar seating on a stamped concrete patio.

Service Area · Centennial, CO

Centennial patiossized to therear yard.

Centennial sits around 5,722 feet in Arapahoe County. Its Land Development Code is specific about patios: how much of the backyard one can cover, how close it can come to the lot line, and where its runoff is allowed to go.

Up to 60% of the rear yard, if the water behaves

Centennial's code lets a patio cover up to 60 percent of the rear yard, provided it is designed not to send more stormwater onto neighboring properties than the yard did before. That makes the slab's fall, and where its water ends up, a code requirement rather than a nicety. We look at the fall and the runoff path on site before pricing the job.

Setbacks for patios and pergolas

A front patio may extend up to 10 feet past the front setback line but must stay at least 2.5 feet from the lot line. Arbors, pergolas and trellises may sit within a setback but no closer than 3 feet to the lot line. A covered patio needs a building permit under the 2021 International Residential Code, with zoning approval and a plot plan showing setbacks, easements and property lines, and the City's guide says structures cannot sit on easements.

The wildfire code, Centennial's version

The Colorado Wildfire Resiliency Code took effect in Centennial on 30 June 2026. The City reports only Low and Moderate fire-intensity zones, and the code applies to projects such as new homes, additions of 500 square feet or more and work on a quarter or more of a home's exterior. Its landscaping rule is narrower: only a new structure or an addition of more than 500 square feet brings in the requirement that the first five feet around the house be non-combustible material such as rock, gravel or concrete, or approved fire-resistant plants. New fencing within eight feet of the house must be non-combustible or vinyl.

Service Area · Centennial, CO

Common Questions

How much of my backyard can a patio cover in Centennial?

Up to 60 percent of the rear yard, as long as the patio is designed not to cause additional stormwater runoff onto neighboring properties. We check the fall and where the water goes on site before pricing.

How close to the property line can a pergola go?

Under Centennial's setback table, arbors, pergolas and trellises may project into a required setback but must stay at least 3 feet from the lot line. A covered patio is a building-permit project that needs zoning approval, and it cannot be placed on an easement.

Does the new wildfire code affect a patio in Centennial?

A patio on its own usually does not. The five-foot landscaping rule applies when you build a new structure or add more than 500 square feet; in that case the zone within five feet of the house must be non-combustible material or approved fire-resistant plants, and concrete is one of the materials the City names. If the patio is part of a bigger project, we check the trigger with the City first.

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