By the Utah ADU Builders Editorial Team · Last verified: July 11, 2026
South Jordan ADU Builders: Rules, Costs, and How to Choose One (2026)
Yes, you can build an ADU in South Jordan and hire a builder to do it — but what you're allowed to build depends heavily on your lot. Choosing between South Jordan ADU builders starts with knowing which unit type your property supports. Internal ADUs (a unit inside your home, like a basement apartment) are allowed on single-family lots larger than 6,000 sq ft. Detached guesthouses are far more restricted today, and a new state law opens a detached path for many larger lots on October 1, 2026.
See which ADU path your lot may support before you request quotes.
What we verified for this page
We separated the facts by type, because they aren't all the same kind of claim:
- Legal, zoning, permit, and local-rule statements were checked against the city's ADU guidebook (Planning & Economic Development, July 2025), the adopted Accessory Dwelling Unit ordinance (South Jordan Municipal Code § 17.130.030, as amended by Ordinance 2025-07), and the city's planning FAQ — plus Utah Code §§ 10-21-303 and 10-21-304.
- Cost ranges are dated Utah planning estimates produced under our own ADU cost methodology, not official South Jordan figures and not builder bids.
- Builder guidance points you to the Utah Division of Professional Licensing (DOPL) to verify any contractor yourself.
- What we did not do: give legal, tax, financing, architectural, or engineering advice, or guarantee any permit approval, fee, timeline, rental income, or property-value result. Rules are moving quickly in 2026 — confirm anything here for your specific address before you design or budget.
Can you build an ADU in South Jordan?
Yes — but the honest answer depends on the property, the project type, and the timing. South Jordan uses separate rules for internal ADUs, detached guesthouses, and Daybreak, and Utah's new detached-ADU baseline arrives October 1, 2026. Here's the quick version before the detail.
A few definitions first
- ADU (accessory dwelling unit):
- a second, self-contained living unit — kitchen, bathroom, sleeping area — on a single-family lot.
- Internal ADU:
- a unit created inside your existing home (a basement apartment is the classic example), contained within the primary dwelling so the home still reads as single-family.
- Guesthouse:
- South Jordan's term for a detached ADU — a separate backyard structure with its own kitchen and bathroom.
- Owner occupancy:
- a requirement that you live on the property (in either the main home or the ADU).
- Setback:
- the minimum distance a structure must sit from your property lines.
Quick check: what your lot likely supports
| Your situation | Most likely starting path | The key qualifier |
|---|---|---|
| The space is inside your existing house | Internal ADU (or a non-rental internal space) | Lot greater than 6,000 sq ft, an eligible A or R zone, owner occupancy, one extra parking space |
| You want a separate backyard structure today | Guesthouse (detached) | Generally requires a lot of at least 14,520 sq ft; not allowed on flag lots; plus setbacks, parking, and design rules |
| You're in Daybreak | Only above a detached or semi-detached garage | Daybreak's own standards and your community documents control — separate review |
| Your lot is 11,000–14,519 sq ft | Possible detached path after Oct 1, 2026 | Not an automatic green light; you must have a single-family home on the lot, and city standards still apply |
| Your basement or garage was finished without permits | Legalization review first | ADUs aren't approved while violations are outstanding; hidden work may need inspection |
Sources: South Jordan ADU Guidebook (July 2025) and Municipal Code § 17.130.030 (Ordinance 2025-07); Utah Code § 10-21-304.
South Jordan ADU rules, by project type
South Jordan allows one ADU per lot, in one of two forms: an internal ADU inside the home, or a detached guesthouse. Both require owner occupancy, both require at least one extra off-street parking space, and neither may have separate meters, mailboxes, or addresses. Beyond that, the two paths diverge sharply — the table below is the part most builders and competing pages get wrong.
| Rule | Internal ADU | Guesthouse (detached) |
|---|---|---|
| Minimum lot size | Greater than 6,000 sq ft | 14,520 sq ft or larger; prohibited on flag lots |
| Eligible zones | A-5, A-1, R-1.8, R-2.5, R-3, R-4, R-5 | Same enumerated A and R zones |
| Property type | Must be a conforming single-family dwelling; not allowed with mobile homes or attached housing | Same |
| Maximum size | Governed by the underlying zone's lot coverage | Lesser of 35% of the main home's living area or 1,500 sq ft (larger needs Planning Commission approval) |
| Height | Set by the zoning district | 25 ft or the main home's height, whichever is less; wall height capped at 16 ft |
| Bedrooms | Not separately capped | No more than 3 |
| Setbacks | Set by the zoning district | Per the zone, but never less than 10 ft from a side or rear line |
| Design | Must keep the single-family appearance; additional street-facing entrances are restricted | Must be compatible with the main home's exterior — materials, colors, and roof pitch |
| Parking | 1 extra off-street space (can't block the home's required parking) | Same |
| Owner occupancy | Required — owner keeps a legal residence on the property | Required |
| Rental term | 30 days or longer — no short-term rentals | Long-term is standard; short-term rentals are allowed with an approved ADU permit plus separate business licensing |
| Meters / mailbox / address | No separate ones allowed | No separate ones allowed |
Source: South Jordan Municipal Code § 17.130.030 (Ordinance 2025-07); city planning FAQ.
A note on the lot-size number: the controlling adopted ordinance says an internal ADU may be approved only on a lot greater than 6,000 sq ft — so a lot measuring exactly 6,000 sq ft does not qualify. The city's homeowner guidebook summarizes this as a "6,000 sq ft minimum," which is slightly looser than the code. If your lot is right at 6,000 sq ft, treat it as a borderline case and confirm before you spend money on plans — the difference is real at the margin.
Do you actually need a permit?
Almost always, yes — and which permit depends on the project. South Jordan's own decision tree is refreshingly clear:
- Guesthouse (detached): Always needs an ADU permit, plus a building permit for construction.
- Internal ADU you plan to rent: Needs an ADU permit.
- Internal space you do not plan to rent: No ADU permit, but you must file a notarized affidavit stating you won't rent it, submitted with your building permit. Construction work still needs a building permit either way.
The one thing that's never optional: if you're building or converting, you're pulling a building permit. Anyone who tells you otherwise is a problem.
The strings attached (that surprise people)
This is the section skeptical homeowners should read twice, because no builder's sales page will tell you:
- •Owner occupancy is enforced. You must keep a legal residence on the property, and the affidavit is recorded against your property at the Salt Lake County Recorder's Office. The affidavit states you'll live in either the primary or the accessory unit as your permanent residence.
- •Annual-inspection authorization. The recorded affidavit authorizes city staff to conduct annual inspections for compliance. (That's authorization — it doesn't mean an inspection happens every single year.)
- •A lien is possible, but not instant. Utah law lets a city place a lien against a property whose owner violates internal-ADU provisions — but only after written notice, a chance to cure, an opportunity to object, and a hearing if you object. If you fix the violation in time, no lien or penalty applies. It's a backstop, not a hair trigger.
- •No separate utility meters, mailboxes, or addresses, and additional street-facing entrances are restricted — the unit has to keep the property looking and functioning like a single-family home.
- •No Airbnb in an internal ADU. Internal-ADU rentals must be 30 days or longer.
None of this makes an ADU a bad idea. It just means an ADU here is a real, regulated second dwelling — not a casual side project.
Which ADU type fits your property?
For most South Jordan homeowners, the practical choice is between an internal ADU (usually a basement) and a detached guesthouse. Internal tends to be cheaper and faster when your existing home can be converted safely; a guesthouse offers more separation but faces stricter lot, setback, utility, and budget tests. Here's how to find yourself.
| Your goal | Likely first option | Why | Not ideal when |
|---|---|---|---|
| House a parent affordably | Internal ADU, or accessible guesthouse | Reuses space or gives real separation | Stairs, egress, or site limits can't be solved |
| Create a long-term rental | Internal ADU | Lower construction friction than detached | Owner-occupancy or parking rules don't work for you |
| Maximum privacy / independence | Guesthouse | A truly separate structure | Lot, access, utilities, or budget are tight, or it's a flag lot |
| Reuse an existing garage | Garage conversion | The shell already exists | You can't replace the lost parking |
| Predictable, comparable design | Prefab / modular | Easier to compare unit specs | Installed scope, access, and utilities are unclear |
Can a basement conversion work?
Often, yes — and in South Jordan it's frequently the smartest first move, because it reuses an existing shell. But feasibility depends on both land-use approval and building-code conditions. On the land-use side: lot size, zone, owner occupancy, and parking. On the building side: ceiling height, egress windows, fire separation, HVAC, electrical, and a compliant entrance. If part of the basement was already finished without a permit, that has to be sorted out before you expand.
Can a garage conversion work?
Sometimes. The big questions are whether it's classified as attached (internal) or detached (guesthouse), whether you can replace the parking the conversion removes, and what the foundation, insulation, and utility work will cost. In Daybreak specifically, above-garage units are the only detached path allowed — see below.
Detached ADUs: today vs. October 1, 2026
Right now, South Jordan only approves detached ADUs as "guesthouses," and only on large lots (14,520+ sq ft, not flag lots) in the enumerated R and A zones. Utah's S.B. 284 (2026) changes the floor: starting October 1, 2026, cities like South Jordan must permit a detached ADU on qualifying lots. It's a meaningful shift — but it is not a blank check.
| Under current city code | From October 1, 2026 (state floor) | |
|---|---|---|
| Where a detached unit is allowed | Guesthouse, in the listed R and A zones only | On a lot that contains a single-family dwelling, where that dwelling is a permitted use |
| Minimum lot size | 14,520 sq ft (not flag lots) | At least 11,000 sq ft with an existing single-family home |
| Approval type | ADU permit (Planning Commission if it exceeds size limits) | Permitted use — a conditional-use permit can't be required in primarily residential zones |
| What stays local | Everything | Setbacks, height, size caps, lot coverage, front-yard placement, parking (within state caps), owner occupancy, and design still apply, plus utility capacity |
Sources: South Jordan Municipal Code § 17.130.030; Utah Code § 10-21-304.
If your lot is 11,000–14,519 sq ft, this is your section. Today you have no detached path. On October 1, you may have a state-protected one — if the statutory requirements, South Jordan's implementing standards, utility capacity, easements, and any preserved development-agreement restrictions all line up. The smart move now isn't to rush a permit application before the rules settle — it's to use the lead time to confirm feasibility and start design, so you're ready when the door opens rather than scrambling after it does.
As of July 11, 2026, South Jordan's current guesthouse standards remain the starting point, and we did not locate a final city ordinance completing the detached-ADU transition. That's a research finding, not proof one doesn't exist. Recheck the city's current code and your parcel's zoning, utilities, setbacks, Daybreak status, and any recorded agreements before relying on the new pathway.
What about Daybreak?
Daybreak plays by its own rules. South Jordan's ADU guidebook does not include Daybreak requirements, and states that Daybreak ADUs are permitted only above a detached or semi-detached garage, with parking governed by the Daybreak Development Standards Matrix. An above-garage configuration is not automatic approval, and applicable development agreements, recorded covenants, design standards, and property conditions can add further limits.
Internal ADUs: Utah law limits an HOA's ability to prohibit a qualifying internal ADU. That protection is real.
Detached ADUs: Restrictions on detached units may remain in private community documents, and SB 284 preserves qualifying detached-ADU restrictions written into development agreements signed on or before May 6, 2026 — a detail that can matter in a master-planned community like Daybreak.
So in Daybreak, your community documents and development agreement can shape or limit the detached path independently of the city's zoning. Pull your CC&Rs and development standards, and confirm the specifics, before you fall in love with a backyard cottage.
How much does an ADU cost in South Jordan?
There's no single honest "South Jordan ADU price," because a basement conversion, a garage conversion, a detached guesthouse, and a fully installed prefab unit are completely different projects. Use the ranges below to screen your idea, then replace them with a real, property-specific estimate that spells out design, site work, utilities, fees, and — critically — what's excluded.
These are Utah planning ranges, not South Jordan bids. Your actual cost depends on your property and scope.
| Project type | Screening range | Planning scope assumed | Biggest unknowns |
|---|---|---|---|
| Basement / internal conversion | $50,000–$120,000+ | Existing shell reused; kitchen, bath, egress, mechanical, finishes | Existing conditions, ceiling height, structural or utility changes |
| Garage conversion | $80,000–$150,000+ | Existing garage adapted to legal living space | Foundation, floor height, insulation, replacement parking, plumbing |
| Detached guesthouse (site-built) | $150,000–$400,000+ | New foundation, shell, mechanical, utilities, finishes, site work | Access, utility trenching, soil, design, finish level |
| Prefab / modular | Property-specific installed quote | Factory-built unit plus local install | Foundation, transport, crane access, utilities, permits, exclusions |
Ranges reflect statewide Utah cost data; see our Utah ADU cost guide for the full breakdown and methodology.
What an attractive headline price often leaves out
The gap between a "$120K ADU" ad and your final bill usually lives in the exclusions. Before you trust any number, make sure it accounts for: survey and soils, architecture and engineering, permit and plan-review fees, utility trenching, utility or panel upgrades, foundation and excavation, crane or module transport (for prefab), landscaping restoration, appliances, finish upgrades, and a contingency for the unexpected. A low bid missing five of these is not actually the cheaper bid.
What South Jordan's fees look like
South Jordan charges a planning review fee for accessory living units — a smaller staff-review fee, plus a larger fee if your project needs Planning Commission review. Those planning fees are not your total cost — building permit fees, plan review, utility connections, recording, and any impact-related charges are separate and depend on your project's classification and valuation. Confirm the current dollar amounts on the city's fee schedule before you budget.
One useful state-law point: under Utah's Impact Fees Act, construction of a statutory internal ADU within your existing primary dwelling is not subject to impact fees — a genuine advantage for basement conversions that does not extend to detached units.
Compare practical build options before you request quotes. Screening only — not a contractor bid or permit approval.
The South Jordan ADU permit process, step by step
Every South Jordan ADU needs approval before anyone moves in, and any construction needs a building permit on top of that. Here's the sequence.
- Figure out your path— guesthouse, rented internal ADU, or non-rental internal space. This determines which approvals you need.
- Assemble your ADU application (submitted through South Jordan's online development portal)— a to-scale site plan showing all structures, parking, driveways, and walkways; a to-scale floor plan with labeled rooms; a completed ADU affidavit recorded at the Salt Lake County Recorder's Office; and building elevations (required for guesthouses).
- City review— staff approves most compliant applications administratively. A guesthouse that exceeds the size limits goes to the Planning Commission.
- Building permit— an approved ADU permit is required before the building permit can be approved. (You can prepare and coordinate building plans alongside the ADU application; it's the approval order that's fixed.) The building permit covers structural, electrical, plumbing, mechanical, energy, and life-safety review.
- Corrections and resubmittals, if the city flags anything.
- Construction, inspections, and final approval. If you're renting, confirm any rental or business licensing separately.
Source: South Jordan ADU Guidebook (July 2025); Municipal Code § 17.130.030.
Already have a basement apartment? Legalizing it may be possible if the unit and property can be brought into compliance — but it's not guaranteed, and South Jordan won't approve an ADU while outstanding ordinance or building violations remain. The outcome depends on permit history, existing violations, egress, fire and life safety, and plumbing, electrical, mechanical, and structural conditions. Portions of concealed work may need to be exposed for inspection. Get it assessed before you assume it's a quick fix.
We're not going to promise you a timeline. South Jordan doesn't publish a guaranteed ADU review time, and total duration depends on feasibility, how complete your plans are, whether corrections or Planning Commission review are needed, utilities, inspections, and your builder's schedule. Treat any quoted review time as a non-guaranteed estimate unless its scope, starting point, and assumptions are disclosed.
How do you compare South Jordan ADU builders?
The biggest risk in this project usually isn't the city — it's hiring a builder who doesn't actually know this city. A credible ADU builder starts with your property's feasibility, not a price per square foot, and can identify and verify South Jordan's current ADU rules rather than reciting half-remembered ones. Compare builders on equivalent scope, current licensing, relevant experience, and contract protections — not just the bottom-line number.
Verify the license yourself
Before you take anyone seriously, verify their license through the Utah Division of Professional Licensing (DOPL) at dopl.utah.gov. Confirm the license is active, the classification fits the work you're contracting, and check for disciplinary history. Then make sure the business name on the proposal matches the licensed entity. (If you use DOPL's Construction Business Registry, note that it shows only active licensees who have opted into that registry — use DOPL's full license-verification lookup for a complete check.)
The builder scorecard
Score anyone you're seriously considering across these categories, and weight completeness of the bid heavily, because that's where low quotes hide their gaps:
| What you're checking | Strong signal | Warning sign |
|---|---|---|
| License | Active, correct entity and classification | Different entity, or you can't verify it |
| Comparable ADU work | Real internal/detached projects you can see | Only generic remodeling photos |
| Feasibility first | Reviews your lot, zone, and utilities before pricing | Instant price from square footage alone |
| Bid completeness | Itemized inclusions, allowances, and written exclusions | One-page lump sum |
| Permit responsibility | Clear on who handles applications and corrections | "Permits included" with no detail |
| Utilities | Named assumptions and allowances | Utilities omitted or "TBD" |
| Payments | Milestones tied to real progress; lien releases | Large vague deposit, front-loaded schedule |
| Changes & warranty | Written change-order process and warranty | Verbal changes, no written warranty |
Other red flags: a firm price before anyone has seen your plans or property; "permit guaranteed"; "we have a relationship with the city, so approval is fast" (no builder controls city decisions or timelines); pressure to sign before the scope is complete; or guaranteed rental income or property-value increases.
Prefab and standardized plans
Prefab can make the unit easier to compare, but it doesn't skip South Jordan's zoning, site review, foundation, utilities, building permit, or — in Daybreak — the above-garage-only rule. The comparison that matters is total installed cost, not the advertised unit price. And here's a South Jordan wrinkle worth knowing: a guesthouse must be compatible with your main home's exterior (materials, colors, roof pitch), which can constrain an off-the-shelf prefab design more than buyers expect. See our Utah prefab ADU guide for more on evaluating installed scope.
Why we route you through feasibility first
Our model is simple and we'd rather be upfront about it: we start you with a feasibility and cost review, then — if it makes sense — a cost estimate, then a connection to a local professional if you want it. We do that because requesting quotes for the wrong project type wastes your money and a builder's time. We may receive compensation when you request estimates or are connected with a professional, and some builders pay for featured placement or priority visibility; when a placement is sponsored, it's labeled.
What can stop an ADU project in South Jordan?
Legal permission doesn't automatically make a lot buildable or a project worth doing. Here's the honest version of what derails South Jordan ADU projects — better to find out now than after you've paid for plans.
Your lot or zone doesn't fit the path you want. A 9,000 sq ft lot can pursue an internal ADU but not a guesthouse today — and won't qualify for the 11,000 sq ft state detached path either. A flag lot can't have a guesthouse at all under current code.
Daybreak or your CC&Rs change the answer. Above-garage only in Daybreak; private documents and development agreements can restrict detached units further.
Parking or entrance placement doesn't work. You need the extra space, you can't block the home's required parking, and additional street-facing entrances are restricted.
Easements or utility limits interfere. Building over a recorded utility easement requires permission from every utility that holds rights there — a common snag for detached units in rear yards. Sewer depth and electrical service capacity can also blow up a budget.
Unpermitted existing work surfaces. It has to be inspected, possibly opened up, and corrected — and the ADU can't be approved while violations remain.
The rental plan conflicts with the rules. Internal ADUs are 30-day-minimum, owner-occupied. "Rent out both units and move away" doesn't work here.
It's possible but financially weak. Sometimes a detached unit pencils poorly and an internal conversion is the smarter play. Sometimes the right answer is "not yet."
The honest bottom line: an ADU is not automatically a smart project just because South Jordan and Utah have become more ADU-friendly. The right project depends on your lot, your Daybreak status, parking, utilities, budget, and how you'll actually use the unit. For a lot of homeowners here, the real answer is "internal ADU or nothing" — and sometimes it's "wait until October." A feasibility review exists to tell you which one you are before you spend money on plans.
A South Jordan ADU feasibility checklist
Run through this before you pay for detailed plans or start collecting bids. It doesn't decide your permit — it surfaces the legal, site, scope, and budget questions that make an estimate reliable instead of a guess.
| Question to answer before you commit money | ✔ |
|---|---|
| Is the property confirmed inside South Jordan (not unincorporated county or a neighboring city)? | |
| Is it in Daybreak or another planned community with its own standards? | |
| What's the verified lot size (and is it a flag lot, which rules out a guesthouse)? | |
| What's the zoning district — one of A-5, A-1, R-1.8, R-2.5, R-3, R-4, R-5? | |
| Which unit type — internal, attached, detached/guesthouse, garage-based, or undecided? | |
| Will the owner keep a legal residence on the property? | |
| Is the unit for family, a 30-day+ rental, a guesthouse short-term rental, or something else? | |
| Is there room for one additional off-street parking space? | |
| Would a garage conversion remove required parking? | |
| Where would any additional entrance go, given the street-facing restrictions? | |
| Are setbacks and lot coverage known? | |
| Are there recorded easements in the build area? | |
| Are water, sewer, electrical, and stormwater conditions known? | |
| Can equipment or a module physically reach the build area? | |
| Is there any existing unpermitted work? | |
| Does the budget match the likely path? | |
| Do the October 2026 rules change your timing? | |
| Are HOA, CC&R, or development-agreement limits known? |
Green across the board doesn't mean approved — it means no obvious dealbreaker, and you're ready for real design and permit review. Any "I don't know" is a question to answer before you commit money.
Feasibility first, then a cost estimate, then a builder connection if you want it. Not a permit approval or a construction quote.
Frequently asked questions
Ready for a straight answer on your property?
Start with property fit, not a generic square-foot price. We'll help you see which ADU path your South Jordan lot likely supports today (and after October 1, 2026), what it may cost, and what to resolve before you request quotes.
This provides general planning information, not legal, architectural, engineering, tax, financing, or contractor advice. A feasibility result is not a permit approval, a professional design, or a construction quote.
Nearby cities with different rules:
Sources we checked
- 1South Jordan ADU Guidebook — Planning & Economic Development (July 2025)
- 2South Jordan Municipal Code § 17.130.030, as amended by Ordinance 2025-07
- 3South Jordan City planning FAQ (including guesthouse short-term rental)
- 4Utah Code §§ 10-21-303 (internal ADUs) and 10-21-304 (detached ADUs, effective October 1, 2026) — enacted via SB 284, 2026 General Session
- 5Utah Division of Professional Licensing — license lookup
- 6Utah Property Rights Ombudsman
This page provides general planning information, not legal, architectural, engineering, tax, financing, or contractor advice. Rules, fees, property conditions, builder availability, and costs change. A feasibility result is not a permit approval, a professional design, or a construction quote.
Last verified: July 11, 2026