Home Addition Contractor in San Bernardino - Design, Permits and Build Under One Contract

Fast, Reliable Home Addition Contractor Across San Bernardino

A home addition in San Bernardino typically costs $180 – $420 per square foot depending on scope, finishes, and whether your lot triggers a utility capacity review. Most additions in this city run between $85,000 and $240,000 for a bedroom-and-bathroom project, with second-story work landing closer to the top of that range. Lodgewick ADU Builders serves San Bernardino homeowners with written pricing before any work starts, a defined arrival window, and the 365-Day Done Right Promise in writing on every project. If you’re planning an addition anywhere from Verdemont down to the flatland blocks near Hospitality Lane, call Russ Delmar and our team at (254) 602-5618 for a free estimate.

Call (254) 602-5618

Why Lodgewick ADU Builders Is San Bernardino’s Preferred Home Addition Contractor Company

We’ve spent years working through San Bernardino’s specific building realities: the large post-WWII lots, the 1950s – 1970s wood-frame stock, the foothill fire zones, and the utility lateral issues left behind by the city’s 2012 municipal bankruptcy. That matters when you’re adding square footage to a house that has 60 years of wiring, framing, and waterproofing history behind its walls.

Crews serving San Bernardino arrive in uniform and background-checked. Every project gets a written price before demolition starts, and that price includes line-item allowances for what we expect to find once walls are open. The work carries a written guarantee, and if something fails within 365 days, we come back and fix it, free. That’s the Kingswell Guarantee, and it applies to every Home Addition Contractor project in our San Bernardino service area.

We don’t hide behind voicemail. A live person answers our phones 24/7, whether you’re calling about a quote in progress or a question about your guarantee. That’s uncommon in this trade, and we think it’s how it should work.

Bathroom Addition Contractor in San Bernardino

A Bathroom Addition Contractor in San Bernardino handles the structural, plumbing, electrical, and waterproofing work behind adding a new full or half bath to a house that didn’t have one in that floor plan. In San Bernardino, that often means extending off a primary bedroom on a 1950s – 1970s wood-frame home, tying into existing cast-iron or older PVC drain lines, and making sure the new wet wall passes a utility capacity review before the city signs off. Expect $35,000 – $75,000 for a standard 5×8 or 6×9 bathroom addition, with footing and foundation work on the upper end.

Built to handle San Bernardino soils and drainage

San Bernardino’s basin sits on expansive and compacted soils that shift with drought and heavy rain cycles. A bathroom addition needs footings sized for that movement, plus waterproofing details that hold up to Santa Ana-driven rain events. We spec the waterproofing in writing before we open the floor.

Wet wall tie-in and lateral reality

The moment a new bathroom’s drain line connects to the existing lateral, the city may want capacity confirmed. On older blocks with undersized laterals from the bankruptcy era, that can mean a lateral upgrade. We include a written allowance so you know the ceiling before we dig, not after.

Bedroom Addition Contractor in San Bernardino

A Bedroom Addition Contractor in San Bernardino expands your home’s sleeping and living space by building outward or upward, often off the rear or side of a house on one of the city’s generous 7,000 – 9,000 sq ft lots. In San Bernardino, a ground-floor bedroom addition commonly costs $75,000 – $140,000 depending on whether it’s a simple bump-out or includes a walk-in closet, en-suite bath, and upgraded insulation. Homes in Verdemont and the north foothills pay more when fire-zone construction standards apply.

Foothill and flatland code differences

Two miles of distance in San Bernardino can change your addition’s cost. Flatland blocks need standard Title 24 energy and structural compliance. Verdemont and areas near the San Bernardino National Forest boundary fall inside Very High Fire Hazard Severity Zones, which triggers ember-resistant vents, Class A roofing, and non-combustible cladding on the new assembly. We price that from the start, not as a surprise.

Framing and insulation for real heat

Summer highs of 108 – 112°F aren’t rare here. A bedroom addition without mechanical cooling isn’t livable, and a mini-split sized for average loads will struggle in late July. We size cooling for San Bernardino’s actual heat gain, and we insulate the walls and attic as if August is the design condition, because here it is.

Common Home Addition Contractor Problems We See in San Bernardino Homes

• Undersized water and sewer laterals. San Bernardino’s 2012 municipal bankruptcy left many older residential blocks with laterals that were never upgraded for added fixtures. An attached addition frequently triggers a capacity review, and the lateral upgrade can become a real mid-project cost.
• Cloth-wrapped wiring in 1950s – 1970s homes. Once we open a wall, the old wiring we find often can’t stay. We write a wiring allowance into every San Bernardino addition contract so the code-mandated upgrade doesn’t hit you as a change order.
• Notched and undersized framing. Many of the city’s wood-frame homes predate current span tables and shear requirements. A bedroom or bathroom addition that ties into compromised framing means correction work before the new structure goes up.
• Fire-zone construction standards in north foothill areas. Verdemont and neighborhoods near the national forest boundary carry Very High Fire Hazard Severity Zone requirements that flatland San Bernardino blocks don’t. Skipping those in a quote is the fastest way to a blown budget.

How a San Bernardino Addition Quote Actually Works

Most people assume a quote is a fixed number that holds. It’s not, and any contractor who tells you otherwise hasn’t done much work in San Bernardino. Here’s what happens on a typical project here: we inspect first, including the existing panel, the crawlspace or foundation, the roof framing we’re tying into, and the visible condition of the sewer lateral cleanout. Then we build a written price with line-item allowances for the known unknowns: outdated wiring, framing repair, waterproofing remediation, and the utility capacity review the city may require. If we find something behind a wall that exceeds the allowance, you get a written change order with a specific price and a signature line. Nothing moves until you approve it. Russ Delmar’s rule is simple: if it isn’t in writing, it doesn’t exist.

Pricing for Home Addition Contractor in San Bernardino, CA

Trusted Brands We Service in San Bernardino

When a San Bernardino homeowner wants a build that goes up quickly with predictable specs, we work with Abodu and Cover for prefab ADU and addition systems, and we specify Mighty Buildings panels where fire-zone and seismic performance matter. These aren’t generic off-the-shelf picks. They’re matched to your lot size, the fire severity zone you’re in, and whether your existing foundation can take a panelized system or needs a traditional stick-built addition. For San Bernardino’s flatland post-WWII grid, we often combine a garage conversion with a panelized bedroom addition to keep the cost per square foot down without cutting corners on insulation or cooling. Parts and materials for these systems are stocked locally so a supply delay in another state doesn’t stall a San Bernardino build.

We Also Serve Cities Near San Bernardino

Our scheduling for San Bernardino projects also reaches Loma Linda, Highland, Rialto, and Colton. The same written-first pricing and 365-Day Done Right Promise apply no matter which side of the 215 you’re on. If you’re in one of those cities and considering a home addition, call us at (254) 602-5618 and we’ll tell you the same thing we tell San Bernardino homeowners: the price goes in writing before the first nail is driven.

FAQs About Home Addition Contractor in San Bernardino