ADU Builders in Bloomington — Design, Permits and Build Under One Contract

Fast, Reliable ADU Builders Across Bloomington

Most Bloomington homeowners we talk to are trying to figure out whether their lot can actually support a second dwelling, and under which set of rules. That county-versus-city question is real here, and it changes everything about cost and timeline. A typical ADU project in Bloomington runs $180,000 to $420,000 for a site-built detached unit, with prefab and Tuff Shed conversions landing between $95,000 and $220,000 depending on utility runs, grading, and permitting path. We work across Bloomington’s 92316 zip code weekly, so we know the parcels off Cedar Avenue, Jurupa Avenue, and Slover Avenue the way a local should. Call (855) 617-6356 when you’re ready to talk scope.

Call (855) 617-6356

Why Holloway ADU Builders Is Bloomington’s Preferred ADU Builders Company

We’re not a general contractor who happens to build ADUs on the side. Holloway ADU Builders exists because Bloomington homeowners need someone who can pull apart the county-versus-city question before any plan gets drawn. Neil Trescott leads our team, and the work we do on unincorporated San Bernardino County parcels in the 92316 area has taught us what to check first: jurisdiction, septic location, well setbacks, and how water moves across an open lot. That’s the difference between a smooth permit path and a redesign halfway through.

Our ADU Builders team works with six major prefab and modular manufacturers, so we’re not pushing you toward one brand because it pays a markup. Bloomington homeowners deserve optionality. Whether it’s a Dvele panelized unit, a Boxabl folding module, or a Tuff Shed conversion, we match the method to your lot, your budget, and your timeline. And because we also handle kitchen and bathroom remodeling, the unit gets finished under one contract rather than handed off to a second crew.

What our Bloomington clients tell us they value most: we walk the property before quoting, we flag the septic and well conflicts early, and we give a written line-item scope that holds. Call (855) 617-6356 and we’ll schedule a site walk.

ADU Plans in Bloomington

ADU Plans in Bloomington start with confirming which government has jurisdiction over your address. A large share of properties here are unincorporated San Bernardino County parcels, not city of Bloomington parcels, so the same floor plan can be reviewed under county setbacks, county septic rules, and county well distances instead of city code. Our planning work for a Bloomington ADU typically runs $4,500 to $12,000, depending on whether we’re handling a detached unit, a garage conversion, or a shop-to-ADU reconfiguration that needs structural review.

Site Assessment and Jurisdiction Check

Before a single line is drawn, we pull the parcel’s tax and zoning data to confirm whether San Bernardino County or the city governs the address. On acreage with well and septic, we locate the septic tank and leach field, measure setbacks from both, and flag any drainage patterns that will affect the slab. This early scoping is why our quotes hold.

Plan Set and Permit Packaging

We prepare the architectural drawings, structural sheets, and site plan as a complete package for county or city submittal. Ducted mini-split placement, west-facing window shading, and Title 24 energy compliance are baked in, not added later as change orders.

ADU Contractor in Bloomington

An ADU Contractor in Bloomington needs to handle county inspections, long material hauls across open lots, and site work that most urban contractors never deal with. Our build pricing for a detached ADU here runs $260,000 to $420,000 for a fully finished one-bedroom unit at current material costs, while a garage or shop conversion typically lands between $120,000 and $220,000. We’re licensed and insured, and we pull permits and manage inspections from first dig to final sign-off.

Site Work and Utility Runs

On Bloomington’s larger parcels, grading and drainage often cost more than the foundation itself. We trench power, water, and sewer or septic connections across whatever distance the lot requires, and we compact and grade so summer storm runoff moves away from the structure instead of pooling against it.

Build and Interior Finish

We frame, side, and roof the structure, then carry the interior all the way to a livable kitchen and bath. Because our Bloomington clients often want the ADU to match the main house, we specify James Hardie fiber cement siding for durability against heat and wind-driven dust, and we size the cooling system for 100-degree Inland Empire summers.

Trusted Brands We Service in Bloomington

We’re brand-agnostic, which means we don’t get paid to steer you toward one manufacturer. We work with Abodu, Cover, Dvele, Mighty Buildings, Boxabl, and Plant Prefab, plus Tuff Shed conversions for a lower-cost entry point, and we can arrange an Abodu service in Bloomington if their units fit your lot. For Bloomington specifically, we keep our material ordering local where possible so that long hauls across the Inland Empire don’t stall a schedule. Dvele’s panelized system works well on open acreage lots, and Boxabl can make sense when access is tight. We’ll show you the real tradeoffs for your parcel before you commit to a method. Call (855) 617-6356 to talk through it.

Common ADU Builders Problems We See in Bloomington Homes

• Quoting city rules on a county parcel. A surprising number of plans in Bloomington get reviewed under city of Bloomington assumptions when the parcel is actually unincorporated San Bernardino County. Setbacks, permit fees, and septic distances all change. We confirm jurisdiction before we quote, not after.
• Well and septic conflicts discovered too late. Many Bloomington acreage properties rely on a private well and septic system. If the proposed ADU sits too close to either, the county rejects the plan. We pull the tank and leach field locations first and adjust the footprint accordingly.
• Flat-lot drainage that pools against new slabs. Bloomington’s open yards look forgiving until a summer storm sends runoff toward the structure. We grade and route drainage as part of the original scope so the slab stays dry and the county inspector passes site drainage requirements.
• Undersized cooling systems for Inland Empire summers. A ducted mini-split sized for a coastal climate fails on a 105-degree Bloomington afternoon. We size the HVAC for real local heat loads and shade west-facing glazing, which also helps Title 24 compliance.

Pricing for ADU Builders in Bloomington, CA

We Also Serve Cities Near Bloomington

We work throughout the west end of the Inland Empire. If you’re in Fontana, Rialto, Glen Avon, or Pedley, the same scoping approach applies, but your parcel may sit under city rules instead of county rules. We’ll confirm jurisdiction the same way we do for every Bloomington property. Call (855) 617-6356 and we’ll sort out which rules apply to your address.

FAQs About ADU Builders in Bloomington