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 Antelope
Room addition costs in Antelope typically run $180 – $340 per square foot for site-built work, with most projects landing between $85,000 and $175,000 depending on size, foundation type, and what’s behind the walls. We’ve been opening up Antelope homes long enough to know exactly what’s back there: stucco over 1980s framing, slab foundations that need moisture planning, and the occasional aluminum wiring surprise. If you’re searching for a Room Addition Contractor who puts the price in writing before demo day, you’ve found us. Call (279) 254-1808 for a free estimate on your Antelope addition.
Why Benson ADU Sacramento Is Antelope’s Preferred Room Addition Contractor Company
Antelope homeowners call us because we’re honest about what a room addition actually involves here. The neighborhood’s housing stock is specific: predominantly 1980s – 2000s single-family homes with slab-on-grade foundations, stucco exteriors, and tile roofs. A contractor who only builds new construction in Folsom won’t know how to handle the shear-wall upgrades and moisture barriers these older homes demand. We do.
Troy Eastman leads our team, and he’s built his reputation on one principle: a written price before any work starts. That’s not a sales pitch. It’s the Relay Visibility Guarantee, and it’s stamped on every project we do in Antelope. You’ll know the cost of your room addition before we swing a hammer, and if anything doesn’t hold up within 365 days, we make it right. No charge, no argument, in writing.
Our crews serving Antelope are background-checked and uniformed. A live person answers our phones around the clock, every day of the year. When you call about your Antelope addition, you talk to someone who can actually help: no voicemail loops, no phone tag, no waiting until Monday.
We’re also authorized to build with the industry’s leading prefab brands, including Cover, Dvele, and Boxabl. That means you get curated options for your Antelope project instead of a take-it-or-leave-it site-built quote. Some homeowners want the speed and precision of a prefab panel system. Others want the flexibility of traditional framing. We’ll price both and let you decide.
Room Additions in Antelope
Room Additions in Antelope are rarely a simple matter of nailing up a few walls. Most homes in this market were built between the 1980s and early 2000s, which means the moment we open up an exterior wall, we’re looking at whatever code upgrades the current permit requires. That’s not a hidden cost, it’s a known one, and we handle it with inspection-first pricing and allowances written into the contract from day one.
What does a room addition involve here? You’re talking about extending the footprint of your home, which on an Antelope lot usually means working with a slab-on-grade foundation and planning the floor elevation so you don’t end up with a step-down transition that drains toward the house. We handle the engineering, the permits, the framing, the electrical, the roofing tie-in, and the final inspection. You get a written line-item quote before anything starts.
Master Suite Additions
Adding a master suite to an Antelope home often triggers the biggest surprises: the existing panel is frequently at capacity, and opening walls reveals aluminum wiring that needs pigtailing or replacement. We price that work as an allowance in the contract, not as a change order that shows up after you’ve committed.
Home Office and Family Room Additions
The 100°F+ Antelope summers make insulation and ventilation non-negotiable for any new living space. We spec upgraded insulation, low-e windows, and properly sized HVAC runs so your new room actually stays comfortable in July, not just March.
Modular Home Addition in Antelope
Modular Home Addition in Antelope costs less than many homeowners expect because much of the construction happens off-site in a controlled factory setting, then gets assembled on your slab. For Antelope’s wider-than-deep lots, modular panels offer a real advantage: they arrive on a truck and go up in days, not months, which matters when you’re living in the house during construction.
We build with leading prefab brands including Cover, Dvele, and Boxabl. Each has its own strengths. Cover produces precision-engineered wall and roof panels that install fast. Dvele offers whole-home health monitoring built into the structure. Boxabl delivers compact, factory-built modules that fold out on-site. We’ll walk you through which fits your Antelope lot, your budget, and your timeline.
Prefab Panel Room Additions
Prefab panels from Cover or Dvele arrive with insulation, windows, and weather barriers pre-installed. That means less time exposed to Antelope’s summer heat during construction and fewer seams where air leaks or moisture can get in. For a slab-on-grade home, we anchor the panels directly to the existing foundation and flash the joint properly.
Detached Room Additions and ADUs
On an Antelope lot with a pool or a protected tree, a detached addition often becomes the smarter play. Detached modular units don’t require tying into your existing roofline, and they can be sited in a side yard that a traditional site-built addition couldn’t use. The 365-Day Done Right Promise covers these projects the same as any other.
Trusted Brands We Service in Antelope
We’re authorized to build with Cover, Dvele, Mighty Buildings, and Boxabl, and we use James Hardie cladding on our site-built work. That’s deliberate. These names carry independent reputations you can research yourself, not just a contractor’s word. Because we stock common prefab components and have direct factory relationships, turnaround on Antelope projects is faster than with a contractor who’s learning these systems on your dime. When you call for a quote, we’ll show you what each brand would cost for your specific addition, in writing, before you choose.
Common Room Addition Contractor Problems We See in Antelope Homes
- Aluminum wiring from the 1980s. Open up an Antelope wall and you’ll often find aluminum branch circuits that have oxidized and hardened at the connections. That’s a fire hazard and a definite code fail. We write electrical panel and rewiring allowances into the contract so this doesn’t become a surprise line item mid-project.
- Slab moisture intrusion at wall transitions. Antelope’s heavy clay soil expands and contracts with our wet winters and bone-dry summers, and failed waterproofing where the slab meets the exterior wall is common. Adding a room correctly means excavating, sealing, and installing proper flashing before any framing goes up.
- Protected tree constraints. Mature redwoods and oaks are everywhere in Antelope, and Sacramento County has ordinances protecting them. A room addition sited too close can trigger stop-work orders and costly root protection requirements. We verify tree location and ordinance compliance during the estimate, not after the permit is filed.
- Undersized headers and shear walls. Homes built in the 1980s – 2000s often have headers that don’t meet current lateral-load requirements. Once a room addition opens the wall line, the inspector will require upgrades. We catch these during our initial inspection and price them up front.
Pricing for Room Addition Contractor in Antelope, CA
Here’s what a room addition in Antelope actually costs, based on the work we’ve priced in this market. A basic bedroom addition runs $85,000 – $120,000. A master suite with bathroom lands at $120,000 – $175,000. A home office addition usually comes in between $70,000 and $110,000. Modular and prefab options often fall 10 – 15% below site-built for comparable square footage, largely because less labor is needed on-site.
What moves the number? Foundation conditions, electrical panel capacity, protected tree locations, and whether your addition ties into the existing roof or stands as a separate structure. We account for all of it in a written quote before work starts. No verbal estimate that shifts later, no scope creep. Call (279) 254-1808 for a free line-item estimate on your Antelope room addition.
We Also Serve Cities Near Antelope
Beyond Antelope, our crews regularly work in Elverta, Citrus Heights, Fair Oaks, and Granite Bay. If you’re just outside Antelope and searching for a room addition contractor who knows Sacramento County’s building code, tree ordinances, and slab foundation quirks, give us a call. We’ll bring the same written-price guarantee to your project.
Serving Antelope, CA - Our Local Coverage Area
We’re based in the Antelope 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 Antelope
Aluminum wiring with hardened connections, undersized headers over existing openings, and failed waterproofing at slab-to-wall transitions are the three we see most often in Antelope’s 1980s – 2000s housing stock. The permit inspection generally triggers upgrades to current electrical and shear-wall code. We handle this by pricing these items as written allowances in the contract from the first conversation, so you’re not blindsided. Call (279) 254-1808 and we’ll walk through what your specific home likely has behind the walls.
Sacramento County tree ordinances protect mature oaks and redwoods, and building within the root protection zone can require special permits, root barriers, or stop-work orders if handled wrong. In practice, this means many Antelope room additions shift to the side yard rather than the rear. We verify tree species, size, and protected status during our free estimate, then site your addition accordingly. Call us at (279) 254-1808 before you plan around that tree.
In most Antelope homes, yes. A room addition can be built on a new slab that ties into the existing foundation using dowels and a proper moisture barrier at the joint. The key is planning the finished floor elevation so you don’t create a step-down or a drainage path toward the house. We inspect the existing slab and soil conditions as part of the estimate and engineer the connection correctly.
Yes, and it’s good you’re asking. Antelope’s hard water accelerates scale buildup in tankless water heaters and fixtures, so we recommend a whole-house softener or a point-of-use treatment on any new bathroom line. We’ll include that in your written quote as a standard item, not an upsell. Get your exact number by calling (279) 254-1808 for a free estimate.
We start with the building envelope: upgraded insulation, low-e windows, and proper air sealing so the addition isn’t fighting the sun. Then we size the HVAC run correctly for the room’s square footage and orientation. On slab foundations, we also pay attention to thermal mass and window placement. The result is a room that stays comfortable in July without a runaway SMUD bill. Call (279) 254-1808 and we’ll spec your addition for Antelope’s actual climate.
Written by Troy Eastman, Owner at Benson ADU Sacramento, serving Antelope and the greater Sacramento County area.
