A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Home Addition Contractor Across San Bernardino
A home addition in San Bernardino typically runs $90,000 to $240,000 depending on scope, and most projects take four to eight months from first walkthrough to final inspection. That’s the honest range we quote before any work starts. Benson ADU Builders has been scoping additions across San Bernardino since our founding, and we know what the older housing stock downtown and the mid-century tracts up toward Cal State demand. From a 200-square-foot bump-out in the Verdemont area to a full second-story addition near Perris Hill Park, the process starts with a written price and a structural check, not a verbal guess. Call (903) 568-7222 and we’ll walk your property with you.
Why Benson ADU Builders Is San Bernardino’s Preferred Home Addition Contractor Company
Homeowners up and down the 215 corridor call us for Home Addition Contractor work because we put the price in writing before a single permit gets pulled. Troy Eastman, who leads our team, insists on that from the first conversation. We’re part of the Relay Home Co. family, founded in 2006, and every project carries the Relay Visibility Guarantee: a written price, a written workmanship guarantee, and a 365-Day Done Right Promise that says if something isn’t right within a full year, we come back and make it right.
Our crews arrive in uniform, background-checked, and you get a live person on the phone around the clock. No phone tag, no mystery subcontractors. For San Bernardino homeowners weighing a $150,000 addition, that matters. You should know exactly who is walking onto your property and exactly what you’re paying, down to the line item.
Second Story Addition Contractor in San Bernardino
When a San Bernardino homeowner needs a Second Story Addition Contractor because the family has outgrown a two-bedroom bungalow but the lot won’t allow a horizontal bump-out, the first question is never “what color walls?” It’s whether the existing footing and lower-floor framing can carry another level. In San Bernardino, that answer often depends on the age of the house. We scope every second-story project with a structural check before we quote anything, because a correction caught at plan check is cheap compared to one caught mid-framing.
Structural checks before pricing
On a 1920s bungalow near the corner of E Street and 5th Street in downtown San Bernardino, we scoped a second-story addition and found the original garage slab and header framing couldn’t carry the new floor without a footing upgrade and a shear-wall package. We pulled the structural calcs, spec’d James Hardie siding to match the existing stucco profile, and set the foundation work before framing so the rough-in inspections could clear in one pass. That kind of sequencing is what keeps a project calendar honest.
What a second story costs here
A second-story addition in San Bernardino typically runs $120,000 to $240,000 for a 600-to-1,000-square-foot scope, including structural retrofit and finish work. If the lower floor was never sheathed for lateral loads, add for a shear-wall and hold-down package. We quote that in writing before work starts. You won’t find a change-order surprise at the first framing inspection.
Garage Addition Contractors in San Bernardino
Homeowners searching for Garage Addition Contractors in San Bernardino are usually solving one of two problems: a detached garage that needs to become rentable living space, or an attached garage that’s been dead storage for a decade. Both routes work, but the path depends on the slab. Many pre-1950 garages in the downtown grid sit on unreinforced slabs that were never meant to support framed walls and a finished floor.
Converting a detached garage
For a detached garage conversion in the neighborhoods around Blair Park, the work usually means a new footing along the existing slab edge, upgraded electrical service, and often a foundation tie-in if the garage is becoming an ADU. Benson ADU Builders is authorized to build with Abodu and Cover, which gives you a panelized option instead of a fully site-built route. The factory-built shell arrives, but the foundation, utility tie-in, and setback compliance still happen on your lot, under permit.
What a garage addition costs here
A garage conversion to living space in San Bernardino usually lands between $70,000 and $140,000, depending on the existing slab condition and how far the electrical panel sits from the garage. A new attached two-car garage with a bonus room above runs $110,000 to $190,000. We write the structural check into the estimate, so that figure reflects the retrofit work, not a fantasy number.
Trusted Brands We Service in San Bernardino
We build with Dvele, Abodu, and Mighty Buildings when the project calls for a factory-precision shell, and we keep relationships with local San Bernardino suppliers active so finish materials don’t stall a job. If a panelized unit needs a specific trim profile or a matching siding line, we can usually source it without a three-week freight delay. We quote the brand, the model, and the lead time in the estimate, and we put that in writing. Homeowners can research these brands independently before signing anything.
Common Home Addition Contractor Problems We See in San Bernardino Homes
- Pre-1950 bungalow footings that were never engineered for additional load. A garage or second-story plan that skips the as-built structural check usually hits a correction at plan check or first inspection. That correction can add $8,000 to $20,000 and four to six weeks, which is why we run the check before we quote.
- Permit and inspection sequencing that stretches the calendar. San Bernardino’s plan-check-to-rough-in cycle has a rhythm, and corrections between those stages are what push small additions past their original finish date. We schedule foundation, framing, and rough-in inspections in one pass where the scope allows.
- Factory-built units treated as plug-and-play. A Boxabl or Plant Prefab shell still needs a properly sized foundation, utility stubs, and local setback compliance on your lot. Skipping that step before ordering the unit is how a fast prefab becomes a slow custom problem.
- Homes in hillside pockets near the foothills north of the 210. Slope and drainage requirements affect foundation design, and a flat-lot estimate won’t carry over to a grade-sensitive parcel. We check topo before we quote on those sites.
Pricing for Home Addition Contractor in San Bernardino, CA
San Bernardino pricing for home additions breaks into three bands. A simple bump-out of 150 to 300 square feet runs $55,000 to $110,000. A garage conversion or attached garage addition lands at $70,000 to $190,000. A second-story addition runs $120,000 to $240,000. What moves the number: foundation retrofit on pre-1950 housing, the existing electrical service capacity, the finish level you choose, and whether the project triggers a structural or drainage review. You’ll get a line-item written quote before work starts, not a verbal range that drifts. Call (903) 568-7222 to schedule a free estimate.
We Also Serve Cities Near San Bernardino
We run crews in Loma Linda, Highland, Rialto, and Colton, and the same written-price process applies in every one of those cities. If you’re just across the 10 or up near the 210, you’re still inside our regular scheduling footprint. To learn more about our coverage, visit our San Bernardino service area page.
Serving San Bernardino, CA - Our Local Coverage Area
We’re based in the San Bernardino 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 Home Addition Contractor in San Bernardino
Yes, almost always. The footing and lower-floor framing in pre-1950 bungalows were built for single-story dead and live loads, not a second story plus finish materials. You’ll typically need a footing upgrade, added shear-wall capacity, and possibly floor joist reinforcement. We scope this before quoting so the estimate is real. Call (903) 568-7222 for an exact figure on your house.
Yes, and it’s often the lower-cost route because you’re reusing an existing structure and roof. The catch is the slab and the setback: many older garages sit on unreinforced concrete and some sit closer to the property line than current code allows for habitable space. We check both before you commit. Call (903) 568-7222 and we’ll inspect yours.
Plan check and permitting typically add four to ten weeks to a home addition in San Bernardino, depending on whether the project triggers structural review or fire-sprinkler requirements. Inspection sequencing between foundation and rough-in adds time only if corrections come back. We schedule the work to clear rough-in inspections in one pass wherever possible, which is why our calendar estimates hold better than industry averages.
Foundation surprises and electrical service upgrades are the two big ones. If we uncover an unreinforced slab or a panel that can’t carry the new load, that’s a change, and we’ll show you the line item before proceeding. The difference is that we flag the likely retrofit during the estimate phase, so the change is rare and the process is transparent. Call (903) 568-7222 for a written quote.
Yes, and they’re a strong option when the site is flat and the setback requirements are met. Benson ADU Builders is authorized to build with Boxabl, Plant Prefab, Mighty Buildings, and Dvele. The unit arrives factory-built, but the foundation, utility tie-in, and local code compliance happen on your San Bernardino lot under permit. We spec and sequence both sides. Call (903) 568-7222 to discuss which brand fits your project.
Because San Bernardino’s housing stock spans early-1900s downtown bungalows to mid-century tract homes, a large share of garage additions and second-story projects here hinge on whether the existing footing and roof structure were ever engineered to carry new loads, a code check that routinely adds a structural retrofit to projects on older downtown parcels. That’s not an optional upgrade. It’s the difference between a plan that passes and a plan that stalls. Our team runs that check on every scope before we put a price in front of you.
If you’re weighing a home addition in San Bernardino, start with a free estimate that accounts for your house’s actual structure, your lot’s actual setbacks, and your city’s actual inspection calendar. Call (903) 568-7222 or request an estimate online and we’ll walk you through the numbers line by line.
Written by Troy Eastman, Owner at Benson ADU Builders, serving San Bernardino since 2006.
