A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Room Addition Contractor Across Redlands
Adding a room in Redlands usually costs between $180 and $340 per square foot for site-built work, so a 400-square-foot primary suite addition typically lands between $72,000 and $136,000 before finishes. That’s the honest range we quote most often, and the final number depends on what the pre-dig finds under your house. We’re the Room Addition Contractor team at Benson ADU Builders, and we serve Redlands from our Inland Empire office with crews who know this city’s housing stock. Call (903) 568-7222 and you’ll get a real person, a written price before any work starts, and a schedule you can actually hold us to.
Why Benson ADU Builders Is Redlands’s Preferred Room Addition Contractor Company
Redlands homeowners call us because we put numbers in writing. Before a single shovel turns, you get a line-item price that includes the foundation, framing, roofing tie-in, drywall, paint, and the permit fees. No verbal estimate that “might adjust” once the walls open. Troy Eastman, who leads our team, built this process around one simple idea: a homeowner should never hear about a surprise cost after the room is framed.
Our crews know central Redlands specifically. We’ve worked around the citrus-era bungalows off West Palm Avenue, the Craftsmans near Smiley Heights, and mid-century ranches east of University Street. That matters because a 1925 house with shallow footings needs a different foundation plan than a 1995 tract home, and we plan for that before the first inspection. Every technician on your property is background-checked and in uniform, and the person who answers your call at 11 p.m. is a live human being, not a voicemail.
Backing all of this is the Relay Visibility Guarantee: a written price before work starts, real-time project tracking, and a 365-Day Done Right Promise. If something isn’t right within a full year, we make it right. In writing. On every project.
Home Addition Plans in Redlands
Home Addition Plans in Redlands start with the floor plan, but the actual design work here is rarely just drawing a rectangle on the side of the house. Most additions we plan in Redlands must match the existing roof pitch, wall depth, and floor height, and that matching exercise drives the design more than anything else. Get it wrong and plan check sends it back, or worse, the room looks visibly bolted on. We produce plans that account for how your house was actually built, not how it would have been built if it were new.
Foundation and Tie-In Planning
Before any design is finalized, we check the existing footing depth and condition. Homes in central Redlands built before 1940 often sit on footings only 18 inches deep, which changes how the new addition must tie in. The plan has to account for a deeper pad footing at the connection point, and that gets priced up front, not discovered mid-project.
Roof and Exterior Matching
Redlands plan check pays attention to rooflines, and so do we. Whether it’s a gable that needs a cricket or a shed roof that has to die into the existing eave, the plan specifies the exact framing and flashing. We also specify the exterior material, and several Redlands clients request James Hardie siding pre-finished to match the existing lap profile, which gets the board widths right without the repaint cycle of old wood.
In Law Suite Builders in Redlands
In Law Suite Builders in Redlands handle a specific type of addition: a self-contained living space with its own entrance, a small kitchenette or full kitchen, and a private bath, typically attached to the main house but separated by a locking door. This is different from an ADU, which under California law is a fully independent dwelling unit with its own address, utility connections, and permitted kitchen. A Redlands in-law suite is usually built for an aging parent or an adult child, not for rental income, and that affects everything from the wet-wall plumbing layout to the door widths.
Bath and Kitchenette Rough-In Scope
An in-law suite needs its own water supply, drain lines, vent stack, and often a dedicated electrical subpanel. In an older Redlands home, the existing main panel may already be at capacity, so the plan includes either a subpanel or a service upgrade. We price that in from the first conversation, not after the drywall is open.
Separate Entrance and Privacy Details
The second thing that defines an in-law suite is the entrance. A well-built Redlands in-law suite has a private entry that doesn’t route guests through the kitchen, plus sound isolation in the shared wall and a locking door between the two living spaces. Those details are simple to build but easy to forget in the plan stage, and retrofitting them later means re-framing.
Trusted Brands We Service in Redlands
Benson ADU Builders is authorized to build with Abodu, Cover, and Dvele prefab systems, which matters to Redlands homeowners who want a panelized addition instead of a fully site-built one. Prefab panels arrive pre-cut and pre-measured, which reduces on-site waste and speeds the enclosure phase. We also source James Hardie cladding for exterior matching work. When a Redlands customer needs a specific brand’s panel replaced or adjusted, we coordinate directly with the manufacturer so the warranty stays intact. That’s harder to arrange with a contractor who isn’t authorized by those brands, and it’s one reason homeowners in Redlands call us after another builder says it can’t be done.
Common Room Addition Contractor Problems We See in Redlands Homes
- Shallow citrus-era footings. Houses built in Redlands before 1940 often have footings only 18 to 24 inches deep, which fail current code for new additions. A builder who assumes a clean slab-on-grade pad will have to redraw the foundation once the pre-dig exposes the truth, and that change order lands on your bill.
- Roof pitch mismatches. Many Redlands bungalows were built with 4:12 or 5:12 roof pitches that modern trusses don’t naturally match. A contractor who defaults to standard trusses ends up with a visible seam at the tie-in, and the fix means custom-cut rafters, not stock lumber.
- Electrical panel capacity in older homes. Citrus-era and mid-century homes in Redlands frequently still run 100-amp panels. A new primary suite with an ensuite bath and dedicated HVAC pulls more load, and the inspector will flag it. The service upgrade should be in the original price, not a surprise at rough-in.
- Plan check timelines being underestimated. Redlands plan review is not a same-week over-the-counter approval. Treating it like one produces schedule promises no honest crew can keep on planned construction work. We quote realistic review windows and hold to them.
Pricing for Room Addition Contractor in Redlands, CA
Site-built room additions in Redlands run roughly $180 to $340 per square foot. A 300-square-foot guest room with a half bath typically lands between $54,000 and $102,000. A 400-square-foot primary suite with a full bath and walk-in closet runs $72,000 to $136,000. An in-law suite with a kitchenette, private bath, and separate entrance usually falls between $200 and $350 per square foot because of the added plumbing and electrical scope. Prefab panel systems from Abodu or Cover can shift the enclosure cost and shorten the framing timeline, and we’ll show you the comparison in writing before you choose. Call (903) 568-7222 for a free written estimate on your specific addition. No verbal numbers, no guessing.
We Also Serve Cities Near Redlands
Our crews work throughout the Inland Empire, including Loma Linda, Mentone, Colton, and Highland. If you’re outside central Redlands but still in the surrounding area, the same written-price guarantee and 365-day promise apply. Call (903) 568-7222 and we’ll tell you straight whether we can schedule your build.
Serving Redlands, CA - Our Local Coverage Area
We’re based in the Redlands 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 Room Addition Contractor in Redlands
A room addition in Redlands moves through six distinct phases: site assessment and foundation check, design and plan check submission, foundation and slab or raised-floor work, framing and roof tie-in, mechanical/electrical/plumbing rough-in, then insulation, drywall, finishes, and final inspection. The piece most people don’t see coming is the foundation check on pre-1940 homes, where we excavate the existing footing to confirm depth before finalizing the foundation plan. That pre-dig step is standard on our Redlands projects because it prevents the most common mid-project price change. Call (903) 568-7222 and we’ll walk you through the full sequence at your house.
A permitted room addition in Redlands requires a building permit, and depending on scope, separate electrical, plumbing, and mechanical permits, plus a foundation inspection before the concrete pour, a framing inspection after the roof is sheathed, a rough-in inspection before drywall, and a final inspection before occupancy. We pull all permits on your behalf and schedule every inspection. The permit fees are itemized in your written price before work begins, so the inspection schedule is never a surprise line item.
Most Redlands room additions take 4 to 8 months from design approval to final inspection. A straightforward 300-square-foot guest room on a newer home with no foundation surprises can finish in around 4 months. A 400-square-foot primary suite tied into a 1920s bungalow with shallow footings and a service panel upgrade often runs 6 to 8 months. Plan check review time alone typically consumes 4 to 8 weeks in Redlands, and we don’t compress that by cutting corners on the drawings. Call (903) 568-7222 for a schedule built around your actual house, not a generic timeline.
The honest list is short: a foundation condition worse than the pre-dig suggested, rotted framing or termite damage discovered when the tie-in wall is opened, an electrical panel that cannot accept the new load, or a change you request to the scope after the contract is signed. Every other cost is in the written price before work starts. We identify the first three during the pre-dig and structural review, which is why our Redlands additions rarely see price changes once framing begins. If a change is necessary, you approve it in writing before any additional work happens.
Yes. An in-law suite needs a dedicated wet wall with its own supply and drain lines, a separate entrance, sound isolation in shared walls, and often a subpanel or main service upgrade if the existing panel is at capacity. A normal room addition with a half bath doesn’t require the kitchenette plumbing or the fire-rated door separation. In Redlands, where older homes frequently still run 100-amp service, the subpanel upgrade is the most common addition to the original scope, and we always include it in the first written price when the initial inspection shows it’s likely. Call (903) 568-7222 to get a written line-item estimate for your specific floor plan.
Get a written price for your Redlands room addition before you commit to anything. Call Benson ADU Builders at (903) 568-7222 and ask for Troy. We’ll schedule the site visit, check the foundation, draw the plan, and hand you a number in writing. Free estimate, no pressure, no surprises.
Written by Troy Eastman, Owner at Benson ADU Builders, serving Redlands and the Inland Empire.
