A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Bloomington, CA
Adding an ADU in Bloomington usually means building a detached unit on a generous lot, and the total project typically lands between $180,000 and $420,000 depending on size, site conditions, and whether you go prefab or site-built. The local twist is jurisdiction: some parcels fall under county rules, others under city rules, and the difference changes your setbacks, fees, and approval path. Benson ADU Riverside builds across Bloomington with written pricing before any work starts, and you can reach us at (831) 231-0809.
Why Bloomington Homes Are Different
Bloomington’s housing stock is a mix of 1950s-to-1970s single-family homes on large lots and newer developments. The older county pockets are where things get interesting for ADUs. Many backyards are big enough for a detached 800-to-1,200 square foot unit, and a lot of them already have a second driveway or alley access. That eliminates the most expensive part of many ADU projects: running new utilities and cutting fresh access from the street.
The climate shapes the build, too. Hot, dry summers mean insulation and cooling are non-negotiable, but the mild winters and low rainfall mean framing, roofing, and exterior work can proceed most of the year without weather delays. Older detached garages from the mid-century era are common, and several are better candidates for full replacement than conversion, depending on the slab and framing condition.
The biggest differentiator in Bloomington is regulatory. An unincorporated county parcel and a city parcel two blocks apart can have different setback requirements, different fee schedules, and different plan-check timelines. A builder who treats every Bloomington lot the same is going to burn your time and money. We verify the jurisdiction on your exact parcel before we quote anything.
Our Main Bloomington Services
Bloomington homeowners usually call us about one of three things: a detached ADU in the backyard, an attached home addition, or a room addition that extends the existing footprint. Each has its own page with pricing and details.
ADU Builders in Bloomington
A detached ADU in Bloomington starts with a site check: where the unit sits relative to setbacks, whether the existing driveway can serve both structures, and what the soil looks like where the slab will go. Many large county lots can host a 2-bedroom unit without variances. We build with prefab systems from Abodu and Cover as well as conventional site-built framing, and every option comes with a written price before you sign. See the full breakdown on our ADU Builders in Bloomington page.
Home Addition Contractor in Bloomington
Attached additions in Bloomington are common on the 1970s ranch-style homes that dominate older neighborhoods. A new wing for a primary suite or expanded kitchen ties into the existing roofline, and the goal is to make the addition look like it was always there. We handle the structural work, the permitting path for your jurisdiction, and the finish details. Pricing and scope specifics are on the Home Addition Contractor in Bloomington page.
Room Addition Contractor in Bloomington
A room addition is the most targeted option: a single office, a bedroom, or a utility room added onto an exterior wall. On Bloomington’s older homes, this often means matching stucco texture and rooflines that haven’t been manufactured the same way for decades. We source materials that blend properly and keep the addition visually consistent. The Room Addition Contractor in Bloomington page covers costs, timelines, and what to expect.
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.
Brands We Service in Bloomington
We build and service ADU projects from Abodu, Cover, and Dvele, and we specify James Hardie cladding on units where exterior durability matters. Parts and panels are coordinated through our Inland Empire office, which keeps construction moving for Bloomington homeowners without waiting on far-off distribution centers. For a closer look, visit our brands page.
Pricing for ADU Company in Bloomington, CA
| Service | Typical range in Bloomington |
|---|---|
| Detached ADU (prefab, 400-600 sq ft) | $180,000 – $260,000 |
| Detached ADU (site-built, 750-1,000 sq ft) | $280,000 – $420,000 |
| Attached ADU conversion (garage) | $120,000 – $180,000 |
| Junior ADU (JADU, within existing footprint) | $70,000 – $110,000 |
| Home addition (primary suite, 400-500 sq ft) | $160,000 – $230,000 |
| Home addition (kitchen expansion) | $120,000 – $180,000 |
| Room addition (single bedroom or office) | $80,000 – $130,000 |
| Detached garage replacement with ADU above | $220,000 – $320,000 |
What pushes prices up in Bloomington is usually site work: tree removal, grading on uneven lots, or trenching utilities across a long backyard. Jurisdiction matters too, since county and city parcels carry different fee structures. Whatever the number is, you get a written price before any work starts, and that price does not move unless you change the scope.
Neighborhoods We Serve in Bloomington
We work across Bloomington’s residential pockets, from the older county parcels near Jurupa Avenue to the newer developments closer to the 10 freeway corridor. Most of our Bloomington clients live in these areas:
- Unincorporated county parcels near Cedar Avenue
- Neighborhoods off Valley Boulevard
- Areas around Bloomington Avenue and Linden Avenue
- Pockets west of Alder Avenue
- Newer developments near the 10 and Sierra Avenue
Typical response time for a Bloomington estimate visit is within one to two business days, depending on our routing that week.
Service Area – Cities Near Bloomington
Benson ADU Riverside serves Bloomington and the surrounding Inland Empire communities. If you’re in Riverside, CA, Grand Terrace, CA, San Bernardino, CA, or Loma Linda, CA, we can schedule an estimate and build under the same written-price guarantee.
Serving Bloomington, CA - Our Local Coverage Area
We’re based in the Bloomington 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 Company in Bloomington
It depends on your exact parcel. Some Bloomington addresses fall under unincorporated San Bernardino County rules, while others are within city jurisdiction. We check your parcel before quoting so you know which approval path, fees, and setback rules apply to your lot.
Many Bloomington lots already have alley access or a second driveway, which reduces site prep substantially. If your property was built between the 1950s and 1970s and still has its original detached garage, we can often replace it with a new ADU on the existing pad. Call (831) 231-0809 and we’ll take a look.
Prefab ADUs can go from permit approval to move-in faster than site-built units, often within a few months. Site-built ADUs run longer, typically five to nine months depending on size and weather. Bloomington’s dry climate helps us keep exterior work on schedule most of the year.
Ready to price your Bloomington ADU, addition, or room expansion? Call Benson ADU Riverside at (831) 231-0809 for a free estimate with a written price before any work begins.
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 Bloomington Customers Say
"Fixed quote and clear change orders approved by text."
- Trina M."Room addition off the kitchen. Framing, drywall, and paint all done well."
- Wade L."Photos of each milestone, which I loved. Slab, framing, roof dry-in, each one came with a few pictures by text."
- Gwen D.
