Buying a Paradise Valley teardown: floor area, setbacks, sewer, and permits

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In Paradise Valley, the lot you buy sets a hard ceiling on the house you can build. On most residential lots, total floor area cannot exceed 25% of the lot, which works out to 10,890 square feet on a one acre parcel, and that number includes accessory buildings. If you are shopping for an older home to tear down or a lot to rebuild on, that rule, the setbacks, and whether the property is on sewer or septic will shape your plans more than the listing photos will.

The short answer

Before you buy a Paradise Valley property to rebuild, confirm the zoning, the 25% floor area limit, the setbacks, the height rules, whether the lot is hillside, and whether it is on sewer or septic. The Town lists four water providers and two sewer providers, and many properties use septic. A complete demolition permit comes before the building permit, and the Town says each plan review can take up to 30 business days.

What the Town rules say

  • Floor area limit: 25% maximum floor area ratio on lots zoned R-175, R-43, R-35, R-35A, R-18, and R-18A, counting all roofed area including accessory buildings (Town of Paradise Valley FAR Certification, revised Feb. 17, 2026)
  • R-43 basics: 43,560 square foot minimum lot, 165 foot minimum width, 40 foot front and rear yards, 20 foot side yards (40 feet for two stories or buildings over 24 feet), and a 24 foot height cap on lots under 3 acres (Jematell Homes summary of Zoning Ordinance Table 1001-A1, updated June 29, 2026)
  • Water: four providers serve the Town: Berneil Water Company, City of Phoenix, EPCOR, and City of Scottsdale, depending on location (Town of Paradise Valley, Water Companies page, viewed Oct. 26, 2026)
  • Sewer: two providers, City of Phoenix and the Town sewer operated by the City of Scottsdale, and the Town notes many properties are on septic instead (Town of Paradise Valley, Sewer page, viewed Oct. 26, 2026)
  • Permit timing: plan reviews may take up to 30 business days each, plus 3 to 5 business days to issue, and permits are valid for 180 days between passed inspections (Town Building Permit Application Information, updated April 2026)

Why these rules matter more than the house on the lot

When you buy to rebuild, you are really buying a building envelope. The existing house may be 4,000 square feet on an acre, but what you can replace it with is set by the floor area ratio, the yards, and the height limits. Two lots with the same acreage can produce very different homes once setbacks, washes, easements, and slope are applied.

The 25% floor area ratio counts more than you might expect

The Town counts all area under roof, including a second story, gazebos, ramadas, and other accessory buildings. Courtyards can count if their walls are taller than 6 feet or if the house wraps more than three sides. Basements count unless they are fully below grade. That last point is why many rebuild plans look at fully subterranean space, which the Town excludes. When a project gets within 3% of the limit, meaning 22% or more, the Town requires a certification stamped by an Arizona registered engineer or land surveyor.

On a one acre lot, 25% is 10,890 square feet. On a 1.5 acre lot, it is 16,335 square feet.

Setbacks and height shape where the house sits

On non-hillside R-43 lots, height is measured from the lowest natural grade under the structure to the highest roof point. There is also an open space plane: nothing within the 60 foot setback area may poke through a plane that starts 16 feet above the 20 foot setback line and rises toward the center of the lot at a 20% slope. In practice, taller parts of a house get pushed toward the middle of the lot. If the lot is a hillside lot, separate hillside rules and an added review apply, which we covered in a separate post.

Sewer or septic changes the budget and the timeline

Your sewer status depends on where the lot sits. If the property is on septic, Maricopa County Environmental Services must approve a new system, added bedrooms or guest houses, or more plumbing fixtures. When a septic property changes hands, the system must be inspected within six months before the transfer, and the buyer files a Notice of Transfer within 15 days with a $60 fee.

Practical steps before you write an offer

  • Confirm zoning and hillside status first. Ask the Town's Community Development Department about the zoning district and whether the lot falls under hillside rules.
  • Order a survey and topo early. Washes, easements, and rights of way all come off the usable envelope, and the site plan must show them.
  • Identify the water and sewer provider. Use the Town's provider boundary maps, then call the provider about service, meter size, and connection costs.
  • Sketch the envelope with an architect. A quick feasibility study that applies the 25% ratio, yards, and height planes can tell you whether the lot supports the home you have in mind.
  • Plan the permit sequence. The demolition permit comes before the building permit. Complete demolition review is $145 in house, and new homes require fire sprinklers.
  • Avoid this mistake: pricing a lot by acreage alone. A one acre lot with a wash, an easement, or slope can support far less house than a flat acre next door, and the seller's asking price usually does not reflect that.

The honest caveats

This post summarizes Town documents and one builder's summary of the zoning table, not the full ordinance. Rules change, older lots can carry special use permits or legal nonconforming conditions, and some subdivisions add their own deed restrictions on top of Town code. The setback figures here come from a secondary summary, so confirm every number with the Town before you rely on it. Permit review times are the Town's stated maximums and can change. Nothing here replaces a zoning verification letter, a survey, or advice from your architect, attorney, or lender.

Frequently asked questions

How big a house can I build on a one acre lot in Paradise Valley?

On lots zoned R-43 and several other residential districts, total floor area generally cannot exceed 25% of the lot, which is 10,890 square feet on one acre. That total includes accessory buildings and any basement that is not fully below grade. Setbacks, height planes, and slope can reduce what fits.

What are the setbacks for R-43 lots in Paradise Valley?

A summary of the Town's zoning table lists 40 foot front and rear yards and 20 foot side yards, rising to 40 feet for two story buildings or buildings over 24 feet tall. Confirm the current figures with the Town's Community Development Department before you design, since some lots carry special conditions.

Do I need a permit to tear down a house in Paradise Valley?

Yes. The Town requires a demolition permit when removing more than 12 linear feet of wall or 12 square feet of roof or structure, and it must be issued before the building permit. The Town's in house review fee for a complete single family demolition is $145.

Are Paradise Valley homes on sewer or septic?

Both. The Town lists two sewer providers, the City of Phoenix and the Town system operated by the City of Scottsdale, and it notes many properties are on septic. Check the Town's provider map for the specific lot.

How long does it take to get a building permit in Paradise Valley?

The Town says the first review and each resubmittal can take up to 30 business days, plus 3 to 5 business days to issue the permit once plans are approved. Hillside lots go through an added hillside review, so plan for extra time.

The bottom line

A Paradise Valley rebuild starts with the rules, not the floor plan. Confirm zoning, the 25% floor area limit, setbacks, height planes, hillside status, and sewer or septic before you commit, and you will know what the lot can actually support. If you want help sizing up a lot or an older home, our team can walk the property with you and line up the right people to check it.

Read more: Paradise Valley hillside lots: how slope decides what you can build · Moving to Paradise Valley from out of state: taxes, one-acre lots, and town services

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Your advisors

Kyle Hermann
Associate Broker | Realtor®
602.814.7266
kyle@azluxurypartners.com
License BR665419000
Meet Kyle

Cheryl Solano
CRS® | Realtor®
480.518.0181
cheryl@azluxurypartners.com
License SA541911000
Meet Cheryl

Art Buck
Associate Broker | Realtor® | CCIM
480.510.7689
art@azluxurypartners.com
License BR014102000
Meet Art

Arizona Luxury Partners | Real Estate Group at RE/MAX Fine Properties

Sources

  • Town of Paradise Valley, Floor Area Ratio (FAR) Certification instructions, revised Feb. 17, 2026. Link
  • Town of Paradise Valley, Height Certification instructions (Residential), revised Feb. 17, 2026. Link
  • Town of Paradise Valley, Building Permit Application Information, updated April 2026. Link
  • Town of Paradise Valley, Water Companies page, viewed Oct. 26, 2026. Link
  • Town of Paradise Valley, Sewer page, viewed Oct. 26, 2026. Link
  • Jematell Homes, Paradise Valley Residential Zoning and Setbacks (summary of Zoning Ordinance Article X, Table 1001-A1), updated June 29, 2026. Link
  • Maricopa County, Onsite Wastewater (Septic Systems) Ownership Transfer, viewed Oct. 26, 2026. Link
  • Floor area examples calculated by Arizona Luxury Partners: 43,560 sq ft x 25% = 10,890 sq ft; 65,340 sq ft (1.5 acres) x 25% = 16,335 sq ft.

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.

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