Paradise Valley hillside lots: how slope decides what you can build

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In Paradise Valley, two one acre lots on the same street can carry very different building rights. On a lot whose building site slopes 10 percent, the town's hillside code allows up to 60 percent of the lot to be disturbed. At a 50 percent slope, the limit drops to 9 percent. That single number, the slope, shapes the size, height, color, lighting, and approval timeline of anything you build or remodel.

The short answer If the ground under the building pad slopes 10 percent or more, or the parcel sits inside the mapped Hillside Development Area, Paradise Valley's hillside code applies. It caps how much of the lot you can grade, how tall you can build, how bright your exterior and lights can be, and it requires Hillside Building Committee approval before a permit. Check slope and hillside status before you write an offer, not after.

What the town code says

• When the rules apply: land in the mapped Hillside Development Area, or natural terrain under the building pad at a slope of 10 percent or more (Paradise Valley Zoning Ordinance, Article XXII, effective November 24, 2018)
• Allowable disturbance: 60 percent of lot area at a 10 percent building site slope, 9 percent at 50 percent, and 4 percent at 100 percent (Article XXII, Table 1)
• Height: 24 feet for the main building measured from natural grade, 16 feet for accessory structures, 40 feet overall (Article XXII, Section 2207)
• Minimum lot size by slope: 1 acre at a 10 percent average slope, 6 acres at 40 percent, 40 acres at 70 percent (Article XXII, Table 3)
• Exterior color: paint and materials may not exceed a light reflective value of 38 percent (Article XXII, Section 2207)
• Committee: six members, three residents appointed by the Town Council and three rotating Planning Commissioners, meeting as needed (Town of Paradise Valley, Hillside Building Committee page, accessed October 2026)

What it means for buyers

Acreage is not the same as buildable area

Disturbance is measured as a share of the whole lot, and it falls fast as slope rises. For a two acre lot of 87,120 square feet, the Table 1 limits work out to about 52,272 square feet of disturbance at a 10 percent building site slope and about 7,841 square feet at a 50 percent slope (calculated by Arizona Luxury Partners). The code does exclude the livable main residence and garage from the count if they meet setbacks and height limits, but driveways, pools, patios, trenches, and graded yard all count in whole or in part.

The rules reach well past the house

Article XXII also limits cuts to 30 feet, fill to 7.5 feet outside the home's footprint, and single retaining walls to 8 feet tall and 100 feet long. Outdoor lighting is capped at 3,000 Kelvin color temperature and 0.25 footcandle at the property line. Pool barriers must be view fencing that is at least 80 percent open. Each of these affects what a renovation or a new backyard can look like.

Near the top of the mountains, the limits tighten again. The code bars any development that alters mountain top ridge lines at or above 1,500 feet above sea level, and no structure may rise above a plane angled 20 degrees down from a primary ridge line. If a lot sits high on Mummy Mountain or Camelback Mountain, ask early how these rules apply to it.

Three common myths

• Myth: "It is an existing home, so the hillside rules do not matter." Remodels, additions, pools, solar, and ramadas on hillside property all go before the committee.
• Myth: "A bigger lot always means a bigger house." On steep ground, minimum lot size and disturbance limits both scale with slope, so more acres can still mean a modest footprint.
• Myth: "Approval is just a formality." New homes and major remodels require a mandatory pre application meeting, a concept review, and a formal review, with notice to neighbors within 1,500 feet.

How to evaluate a hillside home or lot before you buy

• Confirm hillside status first. Ask the Town of Paradise Valley planning staff whether the parcel is in the Hillside Development Area and request any prior hillside approvals on file.
• Get a topographic survey. Slope under the building pad drives disturbance, so a current survey from a licensed surveyor is the starting point for any plan.
• Match your plans to the code. If you intend to add a casita, pool, or larger patio, have an architect who knows Article XXII sketch it during your inspection period.
• Read the existing approvals. Prior plans show what was approved and how much disturbance may already be used.
• Budget time. Build committee review into your timeline for any project, including smaller ones.

Avoid this mistake: pricing a teardown or a big remodel on hillside property using the square footage you would get on a flat lot. Run the disturbance and height math, or have a design professional do it, before you settle on a price.

The honest caveats

This is a summary of the town's published code, not a substitute for it. Article XXII has many more rules, exemptions, and figures than fit here, and the town can amend it. Not every lot with some slope is a hillside lot, and some hillside lots have approvals or conditions that predate the current code. Interpretation is up to the town and the committee. Talk with the Town of Paradise Valley, a licensed architect or civil engineer, and an attorney if a decision depends on what you can build.

Frequently asked questions

What counts as a hillside lot in Paradise Valley?

Under Article XXII of the Paradise Valley Zoning Ordinance, land is subject to the hillside rules if it sits inside the Hillside Development Area mapped in the code, or if the natural terrain under the building pad has a slope of 10 percent or more. A 10 percent slope created only by a natural wash on otherwise flat land is exempt. The town can confirm whether a specific parcel is covered.

Do I need Hillside Building Committee approval to remodel?

Usually, yes. The code says no building permit may be issued for hillside property until the committee approves the application, and the review track depends on the project. Very small additions can go to an administrative chair review, minor remodels, pools, and solar go to a combined review, and new homes and major remodels go through both a concept review and a formal review.

How tall can a house be on a Paradise Valley hillside lot?

The main building is limited to 24 feet, measured from a plane that follows the natural grade before development. Accessory structures are limited to 16 feet, and the overall height from the highest point to the lowest natural grade at the lowest building cannot exceed 40 feet.

Can I paint a hillside home white in Paradise Valley?

Generally not. Exterior paint and materials on hillside property cannot have a light reflective value above 38 percent, and mirrored or reflective glass is prohibited. The committee can approve small contrasting accents such as doors and window mullions.

How long does hillside approval take?

The code does not set a single timeline, and the committee meets as needed. Neighbors within 1,500 feet must receive notice at least three weeks before concept and formal review meetings, so plan for several months on a new home. After approval, the building permit application is due within 12 months, and an application that is not approved expires after 18 months.

The bottom line

In Paradise Valley, slope sets the limits on hillside property, from how much ground you can grade to the color of the stucco. Before you buy a lot or a home you plan to change, confirm hillside status, get the survey, and test your plans against Article XXII. That homework is what turns acreage into a realistic plan.

Read more: Moving to Fountain Hills from out of state: what to know before you buy

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Sources

• Town of Paradise Valley, Zoning Ordinance Article XXII, Hillside Development Regulations, effective November 24, 2018 (Ordinance 2018-15), accessed October 23, 2026. Link
• Town of Paradise Valley, Hillside Building Committee page, accessed October 23, 2026. Link
• Disturbance area examples calculated by Arizona Luxury Partners: a two acre lot of 87,120 square feet multiplied by the Table 1 limits of 60 percent (10 percent slope) and 9 percent (50 percent slope).

All information provided is deemed reliable but is not guaranteed and should be independently verified. This article is for general information only and is not financial, lending, legal, or tax advice. Arizona Luxury Partners | Real Estate Group at RE/MAX Fine Properties, 21020 N. Pima Road, Scottsdale, AZ 85255. Brokerage License LC629808000. Equal Housing Opportunity.