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 Granada Hills
Adding square footage to a Granada Hills home almost always starts with the same question: what’s behind these walls? On the 1950s and 60s ranch houses that dominate Granada Hills, the honest answer is usually outdated wiring, undersized headers, and framing that predates modern code by decades. We’re Benson ADU Santa Clarita, and our Home Addition Contractor crews work Granada Hills week in and week out. We know what the city’s permit office flags, what the sloping Knollwood lots demand, and what a realistic price looks like before drywall goes up. If you’re planning a room addition, second story, or bump-out, call (661) 219-7906 for a written estimate that accounts for the real conditions on your lot, not a generic flat-Valley quote.
Key takeaways:
- Granada Hills home additions typically cost $185 – $340 per square foot, depending on scope and site conditions.
- Older ranch homes here often need electrical panel and framing upgrades before walls can close.
- Bathroom additions in Granada Hills run $48,000 – $85,000; bedroom additions run $55,000 – $110,000.
- Every project includes a written price before work starts and a 365-Day Done Right Promise.
Why Benson ADU Santa Clarita Is Granada Hills’s Preferred Home Addition Contractor Company
Granada Hills homeowners don’t need a contractor who talks in vague percentages. They need someone who can look at a 1962 ranch on a gently sloping Knollwood lot and tell them, in writing, what the foundation will require, where the new roofline ties in, and what the permit will trigger. That’s what Troy Eastman built this team around. Troy runs Benson ADU Santa Clarita with a simple rule: inspect first, price second, and never let a homeowner discover a surprise change order after the wall is open.
Our crews serve Granada Hills directly. Dispatch and scheduling are coordinated from the brand’s Los Angeles office, but the people on your job site live and work in the Valley. We’re on Granada Hills streets every week, from the ranch tracts off Balboa Boulevard to the larger lots up toward O’Melveny Park. The homes we open up in Granada Hills tell a consistent story: original framing, outdated panels, and roof-to-wall junctions that haven’t seen proper flashing since they were built. We price for that reality up front.
Homeowners who call us get a live person on the phone, 24/7. The technician who shows up is background-checked and in uniform. And the price we quote is the price we honor, backed by a written guarantee on every project. If something isn’t right within 365 days, we make it right. That’s not a marketing line. It’s stamped on every contract we hand a Granada Hills homeowner.
Bathroom Addition Contractor in Granada Hills
A Bathroom Addition Contractor in Granada Hills has to solve for one thing most Valley contractors never mention: moisture management. A new bathroom tied to a 1950s ranch means new venting, new waterproofing at every junction, and often a new circuit because the existing bathroom outlet is sharing a 15-amp breaker with two bedrooms. We plan for all of it before we price the job. A full bathroom addition in Granada Hills, with mid-range finishes and proper venting, typically runs $48,000 – $85,000 depending on whether you’re converting existing space or adding new square footage.
Adding a Bath to an Older Granada Hills Ranch
When we add a bathroom to a ranch home off Rinaldi Street or in the neighborhoods around Granada Hills Charter, the first question is where the drain line can go. Many 1950s ranches here sit on raised foundations, which actually helps: we can run waste lines under the floor without saw-cutting a slab. If your home is on a slab, which some 1960s Granada Hills builds are, we plan for a pump or a wall-hung toilet option and price it into the contract from the start.
Venting, Waterproofing, and the Hidden Costs
Bathroom additions in Granada Hills fail when the venting is an afterthought. We size the exhaust fan to the room’s cubic volume and run duct to the exterior, not into the attic. Waterproofing is the other make-or-break: a properly sloped pan, a continuous membrane at the curb, and tile backer board sealed at every seam. These aren’t upgrades we try to upsell later. They’re in the base price because we know the alternative is a callback and drywall tear-out six months after final inspection.
Bedroom Addition Contractor in Granada Hills
A Bedroom Addition Contractor in Granada Hills has to work with lots that are generous by Valley standards, but rarely flat. The gently sloping rear yards in Knollwood and along the streets east of Balboa give us options: a walk-out lower level, a garage-below design, or a simple single-story bump-out that follows the existing roofline. What matters is that we inspect the slope and the existing foundation before we commit to a number. A bedroom addition in Granada Hills typically runs $55,000 – $110,000 depending on size, foundation work, and whether we’re tying into existing systems or running new ones.
When the Lot Slopes, the Foundation Matters
We opened a rear wall on a 1958 ranch in the Knollwood area to tie in a new bedroom and found original knob-and-tube wiring feeding two circuits and a sagging header over the existing window. Both were flagged on our pre-construction inspection. We wrote an allowance for the panel upgrade and reframing, then sent a photo-backed change order for the hidden rot in the bottom plate. The client approved it before we touched the beam. With new Simpson Strong-Tie connectors and a 200-amp panel in place, the addition passed final inspection without a single correction. That’s how a Granada Hills addition should go: the allowance was in the contract, the surprise was photographed and priced, and nothing slowed the job down.
Keeping the New Bedroom Comfortable Year-Round
Granada Hills summers hit hard. A bedroom addition with a west-facing wall needs insulation beyond the minimum, and we spec R-19 walls and R-30 ceiling as a minimum on additions here, with upgraded ventilation for the Santa Ana wind season. Winter brings a different set of problems: the original roof-to-wall junctions on 1950s ranches are often the first place water gets in. We inspect those junctions before we frame, and we fix them as part of the addition scope, not as a separate line item later.
Trusted Brands We Service in Granada Hills
Benson ADU Santa Clarita is authorized to build with the prefab and materials brands Granada Hills homeowners actually research: Plant Prefab for panelized construction that shortens on-site time, Abodu for turnkey ADU designs, and James Hardie for cladding that stands up to the Valley’s dry heat and Santa Ana winds. For garage or workshop additions, we work with Tuff Shed. When you call us for a home addition in Granada Hills, you’re not stuck with one take-it-or-leave-it product. You get options from brands with published specs and independent reviews, so you can verify quality before we sign anything.
Common Home Addition Contractor Problems We See in Granada Hills Homes
- Overloaded 1950s – 70s electrical panels. Most original panels in Granada Hills ranches are 60 – 100 amp units that can’t carry a new bedroom or bathroom. We include a panel upgrade allowance in the base contract so the addition doesn’t go dark mid-project while you scramble for another electrician.
- Under-framed additions on sloping Knollwood lots. A rear addition that isn’t properly tied to the existing structure can rack or develop step cracks at the marriage line when Santa Ana winds hit. We spec the connectors and shear transfer up front, not after the drywall cracks.
- Failed waterproofing at the original roof-to-wall junction. The first winter rain after a poorly flashed addition will find the seam between new roof and old roofline. We inspect those junctions before framing and price the fix into the original scope.
- Missing or rotted bottom plates where the addition meets the original slab. Granada Hills ranches from the 50s and 60s often show rot at grade level. We photograph it, price it in a change order, and get your written approval before we build over it.
Pricing for Home Addition Contractor in Granada Hills, CA
Let’s talk real numbers for Granada Hills. A straightforward bump-out addition runs $185 – $250 per square foot. A full bedroom addition with electrical, insulation, drywall, and finishes runs $250 – $340 per square foot. Bathroom additions run higher per square foot because of plumbing, venting, and waterproofing: expect $48,000 – $85,000 for a complete bath. The variables that move a Granada Hills price: whether your lot slopes and how much foundation work that triggers, whether your existing panel needs an upgrade, and whether the original roof-to-wall junction needs re-flashing. Every estimate from Benson ADU Santa Clarita is a written line-item price, not a verbal ballpark. Call (661) 219-7906 and we’ll put a number in writing before any work starts.
We Also Serve Cities Near Granada Hills
While this page covers Home Addition Contractor in Granada Hills in depth, our crews also work in Mission Hills, San Fernando, Northridge, and Sylmar. If you’re a Valley homeowner a few exits away, call (661) 219-7906 and we’ll schedule the same inspection-first, written-price process for your project.
Serving Granada Hills, CA - Our Local Coverage Area
We’re based in the Granada Hills 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 Granada Hills
The city will require that the existing structure meet current electrical and structural code before we close up walls. That typically means a panel upgrade if your home still has a 60 – 100 amp panel, any original knob-and-tube wiring replaced or de-energized, and structural framing corrected if we find undersized headers or compromised shear walls. We inspect for all of this before we bid, and we write a specific allowance into your contract so the permit-triggered work doesn’t arrive as a surprise. Call (661) 219-7906 to have us walk your Granada Hills home and tell you exactly what your project will trigger.
We frame the addition as a separate load path from the original house, with engineered beams and connectors sized for the floor system above the garage. That means the new bathroom doesn’t rely on the garage’s original framing to carry the added weight. The slope actually works in your favor here: a garage-below design on a Knollwood lot gives you usable space without the extensive excavation a flatter Valley lot would require. We inspect the slope and the existing garage framing before we price, so your contract reflects the real structural work. Call (661) 219-7906 for a written estimate on a garage-below addition.
Not automatically. If we’re tying a new addition into the original structure, the city may require the connection point to meet current lateral-load standards, but a full seismic retrofit of the entire original house is usually only mandated when the addition significantly alters the existing structure’s load path. We’ll tell you exactly what your specific project triggers during our pre-construction inspection, and we’ll price it in writing before you commit. Call (661) 219-7906 to schedule that inspection in Granada Hills.
We fix it before we frame. When a new addition roof ties into the original roofline, the junction is the most likely point of failure on any Granada Hills ranch. We inspect the existing flashing and underlayment at that seam, replace what’s compromised, and install new flashing and membrane that spans both the old and new roof planes. That work is in the base contract, not a surprise line item. The first winter rain should be a non-event. Call (661) 219-7906 and we’ll inspect your roof-to-wall junction as part of the free estimate.
We spec insulation and ventilation for the actual Granada Hills climate, not a state minimum. That means R-19 walls and R-30 ceiling minimums, low-e windows positioned to limit western exposure, and attic ventilation sized for the Santa Ana wind season. For winter, we re-flash every roof-to-wall junction and check the original roofline where the addition ties in. The result is a bedroom that stays comfortable in August and dry in February. Call (661) 219-7906 for a written quote that includes these specs by default.
What a Granada Hills Home Addition Contractor Must Inspect Before Quoting
This is the part most contractors skip. Before we give you a number for a Granada Hills home addition, we inspect four things: the existing electrical panel and service size, the condition of original framing at the tie-in point, the roof-to-wall junctions where new meets old, and the slope and drainage of your lot. On 1950s through 1970s ranches here, those four inspections almost always turn up something: a panel that can’t carry the added load, a sagging header, failed flashing, or a bottom plate with rot. We price those findings as written allowances in your contract. If something else surfaces mid-project, we send a photo-backed change order and get your approval in writing before we touch it. That’s the difference between a Granada Hills quote that holds and a flat-Valley quote that unravels. Call (661) 219-7906 to schedule the inspection that makes your estimate real.
Written by Troy Eastman, Owner at Benson ADU Santa Clarita, serving Granada Hills since day one.
