ADU in Mira Loma, CA
Junior ADU and interior conversion projects in Mira Loma typically run $85,000-$165,000 all-in, while site prep and utility work adds $25,000-$75,000 depending on existing infrastructure. We’re Ellery ADU Studio, and our Junior ADU & Interior Conversion work in Mira Loma focuses on converting the area’s 1960s-1980s ranch homes and their existing outbuildings into permitted, climate-ready dwelling units. Call (909) 637-3715 to schedule your free estimate.
Why Mira Loma Homes Are Different
Mira Loma sits within Jurupa Valley’s residential-agricultural zoning belt, where quarter-acre to multi-acre parcels carry barns, tack rooms, and workshops that predate modern permitting. The inland valley climate pushes summer highs past 105°F, so every detached unit we design specifies cool-roof assemblies and correctly sized ductless mini-splits. Many horse properties hold unpermitted agricultural structures built over decades; Jurupa Valley requires these to be legalized or demolished before an ADU permit can be finaled. That pre-application site audit is a step contractors from denser neighboring cities often skip.
Our Main Mira Loma Services
Most Mira Loma homeowners start with one of these three services:
ADU Design & Permitting in Mira Loma
We produce the full permit set as a core deliverable, not an afterthought. In Mira Loma, that means navigating Jurupa Valley’s RA zoning rules and documenting any existing unpermitted structures before submission. ADU Design & Permitting in Mira Loma covers feasibility studies, Title 24 energy calculations, and coastal zone checks if applicable.
Garage Conversion ADU in Mira Loma
Detached garages on these older ranch properties often convert more cost-effectively than ground-up builds. We assess slab thickness, roof structure, and electrical capacity before quoting. Garage Conversion ADU in Mira Loma includes all drawings, permits, and construction under one contract.
New Detached ADU in Mira Loma
For properties without suitable existing structures, we design and build new detached units sized to the lot coverage limits of RA zoning. We specify prefab systems from brands like Cover or Dvele when the timeline demands it. New Detached ADU in Mira Loma coordinates every trade through final inspection.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Before
AfterJunior ADU & Interior Conversion in Mira Loma
Mira Loma’s 1960s-1980s ranch homes offer natural Junior ADU opportunities: attached garages with side entries, oversized utility rooms, and underutilized wings that share a wall with the main house. The extreme summer heat makes interior conversions particularly practical, since they tap the existing HVAC envelope rather than requiring standalone cooling systems sized for 105°F peaks. Our Junior ADU & Interior Conversion service handles every step from code analysis to final inspection under one written price.
Room-to-ADU Conversion
Signs you need it
An attached bedroom or den sits unused, the home has a separate exterior door nearby, and the owner wants rental income without new construction.
What it costs in Mira Loma
Room-to-ADU conversions in Mira Loma typically run $85,000-$140,000 including the kitchenette, bathroom, permit set, and fire separation upgrades.
How we do it
We verify the existing slab and walls meet JADU code, design the kitchenette and bath layout, produce the permit set, and build with documented photos at each phase.
Interior JADU
Signs you need it
The owner occupies the main house, has 500-800 square feet of underused interior space, and wants a legally rentable unit with a separate entrance.
What it costs in Mira Loma
Interior JADUs in Mira Loma typically range $75,000-$125,000 depending on whether the space needs new plumbing rough-in or shares existing lines.
How we do it
We confirm owner-occupancy compliance, design for the smaller JADU parking exemption, pull permits through Jurupa Valley, and deliver a documented photo record at completion.
What Junior ADU & Interior Conversion Costs in Mira Loma
| Item | Typical range in Mira Loma |
|---|---|
| Room-to-ADU conversion | $85,000-$140,000 |
| Interior JADU | $75,000-$125,000 |
| Above-garage ADU | $110,000-$165,000 |
Can a room-to-ADU conversion share my existing HVAC?
Sometimes, if the main system has capacity; more often we specify a dedicated ductless mini-split sized for the new thermal envelope. Call (909) 637-3715 and we’ll assess your specific system during the free estimate.
Does a JADU need its own electric meter in Mira Loma?
No, a Junior ADU can share the main meter under state law, though many owners opt for a sub-meter to track tenant usage. We handle either configuration in our permit set.
ADU Site Prep & Utilities in Mira Loma
Mira Loma’s older ranch properties often need significant infrastructure before an ADU can be occupied: electrical panels from the 1970s that can’t handle an additional dwelling unit, septic systems sized only for the main house, and grading to address the subtle drainage patterns across these large, flat parcels. Our ADU Site Prep & Utilities service evaluates every utility line before construction starts, so no surprise trenching delays the project.
Electrical Panel Upgrade
Signs you need it
The existing panel is under 200 amps, has no open breaker spaces, or still uses Zinsco or Federal Pacific equipment that insurers now reject.
What it costs in Mira Loma
Electrical panel upgrades for ADU service in Mira Loma typically run $4,500-$9,000 including SCE coordination, permit, and inspection.
How we do it
We size the new load calculation for the ADU plus main house, coordinate with Southern California Edison, pull the permit, and pass inspection before rough-in begins.
Plumbing Lateral
Signs you need it
The existing sewer lateral is cast iron or clay from the 1960s-1980s, the septic system was never sized for additional bedrooms, or the ADU sits more than 100 feet from the main line.
What it costs in Mira Loma
Plumbing lateral extensions or replacements in Mira Loma typically range $8,000-$18,000 depending on trench length and whether we hit the existing septic or connect to city sewer.
How we do it
We camera the existing line, design the new route with proper fall, trench with minimal disruption to established landscaping, and pressure-test before backfill.
What ADU Site Prep & Utilities Costs in Mira Loma
| Item | Typical range in Mira Loma |
|---|---|
| Electrical panel upgrade | $4,500-$9,000 |
| Plumbing lateral work | $8,000-$18,000 |
| Foundation and grading | $12,000-$35,000 |
Will SCE require a new service drop for my ADU?
Often no, if the panel upgrade stays within the existing service capacity; for larger detached units, a second drop may be required and we coordinate that application. Call (909) 637-3715 and we’ll confirm with your specific address.
Can you connect an ADU to an existing septic system?
Only if the system was originally permitted for the additional bedroom count; otherwise Jurupa Valley requires septic expansion or city sewer connection, which we determine in our pre-application site audit.
Brands We Service in Mira Loma
We specify and coordinate prefab and modular systems from Cover, Dvele, and Mighty Buildings within our single-contract model. Parts and warranty support are stocked regionally, with typical prefab coordination timelines running 12-16 weeks from deposit to site delivery.
Pricing for ADU in Mira Loma, CA
| Service | Typical range in Mira Loma |
|---|---|
| Interior JADU | $75,000-$125,000 |
| Room-to-ADU conversion | $85,000-$140,000 |
| Above-garage ADU | $110,000-$165,000 |
| Electrical panel upgrade | $4,500-$9,000 |
| Plumbing lateral work | $8,000-$18,000 |
| Foundation and grading | $12,000-$35,000 |
| Gas line extension | $3,500-$8,000 |
| Landscaping and hardscape | $5,000-$15,000 |
Prices push higher in Mira Loma when we encounter unpermitted structures that must be legalized or demolished first, or when existing utilities require complete replacement rather than extension. Every project is quoted with a written price before any work begins, per Haven Standard Clause 1.
Neighborhoods We Serve in Mira Loma
We work across Mira Loma’s residential-agricultural parcels, from established ranch neighborhoods to newer infill. Dispatch and scheduling are coordinated from our Los Angeles office; crews serve Mira Loma locally with typical response within one business day.
- Van Buren Ranch
- Mira Loma Village
- Indian Hills
- Rancho Jurupa
- Sky Country
Service Area - Cities Near Mira Loma
Our crews work throughout western Riverside and San Bernardino counties. We regularly coordinate permits and inspections in Norco, CA, Fontana, CA, Bloomington, CA, and Ontario, CA, where building departments share some procedural overlap with Jurupa Valley.
Serving Mira Loma, CA - Our Local Coverage Area
We’re based in the Mira Loma area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU in Mira Loma
California’s SB 9 and state ADU law require ministerial approval within 60 days, but incomplete applications cycle back. We pre-verify every document before submission, and our permit set completeness typically keeps Mira Loma projects inside that window.
RA zoning allows ADUs but restricts where they sit relative to animal enclosures and wellheads; our feasibility study maps these setbacks before you commit to design.
Only after Jurupa Valley’s building department approves its legalization or its removal; we run that pre-application audit as the first step in every Mira Loma project with legacy structures.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Mira Loma Customers Say
"The permit set and the build were one contract with one number. Our neighbours used two firms and spent a year watching them blame each other."
- Helena V."Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
- Benedict H."Garage conversion finished on the drawings and close to the schedule. They were honest that the sewer connection was the unknown, and it was."
- Arjun D.