Sandy ADU Builders: Costs, City Rules, and How to Hire in Sandy, Utah (2026)

Can you build an ADU in Sandy right now?

Yes. Sandy now has attached and detached ADU paths under Ordinance 26-55. Start with the property’s zone, existing dwelling, ownership and intended use. The ordinance applies to a single-family residential property with no more than one existing single-family home, or a home under construction with a building permit; additional zone-specific conditions may apply.

Owner occupancy and applicant eligibility

The owner must occupy either the primary home or the ADU as their primary residence. The applicant must be an individual or a qualifying family-trust trustor with at least 50% ownership; corporations, partnerships and LLCs cannot hold the ADU special use permit.

Confirm these current site and connectivity rules with Sandy before paying for plans:

Is your zone eligible?

Begin with the property’s zoning district and confirm that it qualifies under Ordinance 26-55. The ordinance applies to a single-family residential property with no more than one existing single-family home, or a home under construction with a building permit. The owner must meet the primary-residence and ownership requirements above; other zone-specific conditions can apply. Check Sandy’s current zoning map before spending money on plans.

Why Sandy's answer is different from Salt Lake City's

Salt Lake City and Sandy now both allow detached ADUs, but their standards differ. Sandy’s Ordinance 26-55 has its own lot, occupancy, permit, business-license, size, setback and parking requirements. Do not apply Salt Lake City standards to a Sandy parcel; confirm the current Sandy rules for your address.

How much does an ADU cost in Sandy?

There is no official "Sandy average," and you should distrust any page that claims one. What we can give you honestly are Utah planning ranges, drawn from our statewide cost research and current as of our last cost check: roughly $60,000–$150,000+ for a basement or internal conversion and $200,000–$400,000+ for a detached, site-built unit, with garage conversions and attached additions falling between.

These are estimates for planning, not bids. They assume design, permits, standard finishes, and utility connections; they do not assume your specific site. Full assumptions and current figures live in our Utah ADU cost guide — if the two pages ever disagree, the cost guide is the canonical, most recently updated source.

What moves the number on a Sandy lot

A few cost drivers deserve early attention on some Sandy properties: parts of the east bench can hit rock or steep grade during excavation, turning a simple dig expensive; basements often need new egress windows cut through concrete; older electrical panels may not carry a second kitchen without an upgrade; and Sandy's parking rule means that if your project modifies required parking (a garage conversion is the usual suspect), you must replace that parking on-site. One more that catches people off guard: if your home is on a septic system, Sandy requires proof from a licensed professional that it's working properly — or connection to sewer (Sandy LDC Sec. 21-11-1). On an older system, that single line item can reshape the budget.

Why two quotes for the "same" project can be tens of thousands apart

Usually it isn't padding — it's scope, assumptions, risk pricing, overhead, scheduling, and exclusions. One bid includes design, engineering, and permit handling; the other assumes you bring finished plans. One assumes your panel and sewer line are fine; the other prices the upgrade. One carries a real finish allowance; the other carries a placeholder. Before comparing prices, force every bid onto the same scope — there's a checklist for exactly that in the builder section below.

How does Sandy's approval process actually work?

Sandy's accessory apartment approval is a set of required components with a few fixed sequence points: a building permit before any construction, an administrative special use permit from Community Development, proof of recordation with the Salt Lake County Recorder before occupancy, and a valid business license before the unit is rented — renewed every year after. The special use permit and business license are interdependent: lose either one and the other is invalidated.

1. 1
   Confirm the property qualifies. Zoning district, ownership structure, owner occupancy, parking, and the physical layout question — can a self-contained unit work within your home with a compliant entrance? This is the stage where a feasibility review earns its keep, before money goes to plans.
2. 2
   Design it and secure the building permit. Sandy requires all building permits before construction, and the unit must meet the city's adopted building, fire, and health codes. Expect to submit a scaled site plan, architectural elevations, and a room-by-room description of which parts of the home become the apartment.
3. 3
   Complete the administrative special use permit. For an attached or detached ADU, show that the fee-title owner is an individual or qualifying family-trust trustor with at least 50% ownership and that the property is the owner's primary residence. Sandy's amended requirements call for government-issued ID showing the address, a notarized owner-occupancy affidavit and at least two of these supporting categories: a redacted W-2 or 1099 from the latest filing period; a voter-registration card from the last calendar year; a vehicle-registration document from the last calendar year; or at least three utility statements showing the owner's name and residential address. The ordinance no longer requires the most recent state and federal tax returns as the standard evidence list.
4. 4
   Build, pass inspections, and record. Approval is recorded with the Salt Lake County Recorder — including a reversion clause spelling out that the space becomes a non-rental extended living area if the permit ever expires. Proof of recordation is required before occupancy.
5. 5
   Hold the business license, then rent. The accessory apartment business license expires January 1 each year and must be renewed annually. Miss the renewal and the special use permit goes with it.

The rules that surprise Sandy homeowners

Sandy's amended ADU standards still prohibit separate utility connections or meters, while allowing qualifying private meters behind the primary meters. They also prohibit a separate address and additional mailbox. An ADU is for one additional single family, and its occupants cannot sublease part of the unit. Parking must meet the current residential schedule: the detached ADU itself needs one assigned space below 650 total square feet and two at 650 square feet or more, in addition to the primary dwelling's required parking. Required parking removed by a conversion must be replaced on-site, and residents' additional vehicles must fit on-site.

And the one that matters when you sell

The special use permit is not transferable. It expires when the property sells, when you stop living there as your primary residence, or when the business license lapses — and the space legally reverts to an extended living area (family and non-paying guests only). A buyer who wants rental income applies fresh (Sandy LDC Sec. 21-11-1). The physical improvements stay with the house either way; how a future buyer or appraiser values them depends on permitted status, layout, construction quality, and the market — but the rental permission itself doesn't ride along. Worth knowing before you build primarily with resale in mind. (Interesting contrast: an extended living area approval, the non-rental version, does transfer to the next owner.)

How long does all this take?

We're not going to invent a number. We haven't found a current, published Sandy dataset on permit turnaround, and any "6–10 weeks" figure you see elsewhere is somebody's guess dressed up as data. What's honest: your timeline is the sum of design and engineering, Sandy's plan review and any correction cycles, construction, inspections, recordation, and licensing — and it moves with submittal completeness, municipal workload, engineering coordination, contractor scheduling, utility work, and whatever's hiding inside existing walls. The lever squarely in your hands is a complete, well-prepared application.

How should you compare Sandy ADU builders?

Choose the builder after you know what you're building — then verify, don't trust. The right Sandy ADU builder is a Utah-licensed contractor whose license you've personally confirmed, who has taken projects through Sandy or neighboring Salt Lake County reviews, and who will price the same written scope as every other bidder.

What we verified for this guide

We wrote this from primary sources, and we'll tell you exactly which ones. For Sandy's current rules, we reviewed the Sandy City Land Development Code provisions governing accessory apartments, extended living areas, and guesthouses (Sec. 21-11-1), the residential permitted land use matrix (Sec. 21-7-2), and the short-term rental section (Sec. 21-11-26), along with Sandy's approved 2026 Consolidated Fee Schedule. For state law, we reviewed the full current text of Utah's internal-ADU statute (Utah Code § 10-21-303), the impact-fee limitation (§ 11-36a-202), and the enrolled text and official summaries of SB 284 from the 2026 General Session. For local status, we reviewed Sandy City Council public records, including the April 2026 detached-ADU work session.

The amended local ordinance expressly states that an internal doorway between the main home and an attached ADU is not required. Cost figures remain editorial planning ranges rather than official Sandy averages, and permit fees must be checked against the schedule in effect at application. Report a suspected outdated claim through the site's contact page so we can reopen the applicable source.