Home Additions & ADU in North Hollywood - Plans, Permits & Build, One Fixed Price

Fast, Reliable Home Additions & ADU Across North Hollywood

Home additions and ADU construction in North Hollywood typically run $45,000-$130,000 for room additions and $90,000-$220,000 for detached ADUs, with most projects requiring 4-8 months from permit to final inspection. We’re Rowan Construction Group, and our crews work the North Hollywood corridor weekly - from the post-WWII bungalows near Victory Boulevard to the soft-story apartment blocks along Magnolia. Dispatch and scheduling run from our Los Angeles office, but the crew that quotes your job is the crew that builds it. Call (562) 203-4508 to schedule your free estimate.

Call (562) 203-4508

Why Rowan Construction Group Pasadena Is North Hollywood’s Preferred Home Additions & ADU Company

We’ve delivered 4,000-plus projects since 2007, every one with a written price before work started and a documented photo record when the crew left. In North Hollywood specifically, that discipline matters more than most places. The neighborhood’s housing stock - 1940s-1960s bungalows with original stucco-over-wood-frame construction and 1960s-1970s soft-story apartment buildings - hides surprises behind finished walls that can derail budgets if they’re not caught early and priced in writing.

Our North Hollywood customers find us the way they find most contractors now: they read the three-star reviews, not the five-star ones, and they want to know what happens when something goes wrong. The answer is Clause 1 of the Haven Standard - the written price before any work starts - and the 365-Day Done Right Promise printed on every contract, backed by a terms page, not an asterisk. If it’s not done right, we make it right.

A live person answers our phones 24/7. Our technicians are background-checked and uniformed. And every visit produces a documented photo record included as standard, not an upgrade. That’s the evidence we show, not the enthusiasm we sell.

Our Home Additions & ADU Services in North Hollywood

ADU Design & Permitting

North Hollywood’s ADU pipeline runs through LADBS, and the permit timeline here averages 6-10 weeks for a prescriptive plan check, longer if your property falls within a hillside grading overlay or the Tujunga Wash flood zone. We handle the full design-build sequence: site survey, utility capacity verification, and the Title 24 energy compliance package that every North Hollywood ADU triggers. Our Home Additions & ADU team prices the permit fees, school district fees, and LADBS plan-check deposits into the written quote from day one - no “call for permit costs” on our contracts.

Garage Conversion ADU

The typical North Hollywood garage conversion runs $30,000-$80,000, and the first thing we check is whether the existing slab meets current seismic anchorage and whether the garage door opening can be infilled with a shear-wall-compliant assembly. Many North Hollywood garages were built as unconditioned space with no footing depth for habitable use, which means the floor may need to be cut and repoured to current standards. We write an allowance for slab investigation into every garage conversion contract before demo starts.

New Detached ADU

Detached ADUs in North Hollywood face setback requirements that vary by zoning - R-1, R-2, or the specific overlay near the NoHo Arts District. We verify the maximum unit size (typically 850-1,000 square feet depending on lot dimensions), the required side and rear yard clearances, and whether fire separation or sprinkler triggers apply. The $90,000-$220,000 range covers foundation, framing, MEP rough-in, and finish - with utility trenching from the main house priced separately based on distance and existing service capacity.

Junior ADU & Interior Conversion

Junior ADUs, limited to 500 square feet within the existing footprint, are common in North Hollywood’s smaller bungalow stock where lot coverage already maxes out. These conversions require a separate exterior entrance and a kitchenette, but they share utility services with the primary residence - which is where the 60-amp panel problem hits. We’ll cover that in the field vignette below. Junior ADUs typically fall in the lower half of the garage conversion range, $30,000-$55,000, depending on how much of the existing structure meets current code.

Room Additions & Second Story Additions

Room additions in North Hollywood - whether a primary suite off the rear or a second-story pop-up - start around $45,000 and run to $130,000 for complex structural work. Second-story additions require particular attention in this neighborhood because the original 1940s-1960s foundations were sized for single-story loads, and the framing may need augmentation or sistering to carry the new weight. We bring a structural engineer to the initial site visit, and that report becomes an exhibit to the written contract.

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Trusted Brands We Service in North Hollywood

Our quotes use real numbers from vetted supplier relationships, not placeholder pricing we adjust later. For North Hollywood ADU and addition projects, we regularly specify GAF Timberline HDZ shingles where roof tie-ins are required, CertainTeed vinyl siding and trim for exterior finishes that handle the Valley’s thermal cycling, and Grohe kitchen and bath fixtures for the interior package. We don’t list every brand to impress; we name the ones we’re actually pricing from this week, so the written quote matches the invoice.

Common Home Additions & ADU Problems We See in North Hollywood Homes

• Hidden knob-and-tube or aluminum branch wiring behind original stucco. North Hollywood’s bungalows were built with 60-amp panels and ungrounded cloth-wrapped conductors that don’t meet current NEC requirements. Once the first wall opens for an addition, LADBS mandates a full panel upgrade - typically $3,500-$6,500 - that wasn’t visible in the initial scope.
• Undersized or notched load-bearing framing from post-1994 cosmetic patches. After the Northridge earthquake, many structures were shored rather than rebuilt to current code. We’ve found headers notched for plumbing vents, joists sistered with inadequate overlap, and subfloors patched over rotted sheathing that won’t carry new loads.
• Failed waterproofing at original exterior walls and flat-roof tie-ins. North Hollywood’s 105°F summer highs accelerate caulk failure and thermal expansion stress. During ADU site prep, we regularly find original stucco paper deteriorated behind the finish coat, requiring re-flash and Title 24 cool-roof upgrades that add $2,000-$5,000 to the envelope scope.
• Soft-story ground-floor conditions in converted duplexes. Owners adding ADUs to existing 1960s-1970s apartment buildings sometimes discover the mandatory retrofit ordinance has triggered LADBS compliance requirements that must be completed before any addition permits issue - a sequencing issue that can add 3-6 months to the timeline.

Pricing for Home Additions & ADU in North Hollywood, CA

How We Handle Opened-Wall Surprises in North Hollywood

This is the single biggest reason a North Hollywood addition quote moves after demo, and it’s the specific problem this page exists to explain.

North Hollywood’s 1940s-1960s post-WWII bungalows were built with undersized 60-amp electrical panels and original stucco-over-wood-frame exteriors, so any addition or ADU here triggers an automatic panel upgrade and often reveals that a prior “renovation” was a cosmetic patch over the original knob-and-tube wiring - work that is entirely absent from the 1960s-70s soft-story corridors that dominate retrofit work in the neighborhood. The two housing types fail differently, and we price them differently.

On a 1952 stucco bungalow near Toluca Lake adjacent to North Hollywood, our crew opened a wall for a primary-suite addition and found the original 60-amp panel feeding aluminum branch wiring spliced to ungrounded cloth-wrapped conductors; the framing at the load-bearing header had been notched by a past handyman for a plumbing vent, leaving it undersized. We wrote an allowance for the electrical rough-in and structural repair into the contract before demo, priced the corrective framing and panel swap as a written change order, and passed LADBS inspection sign-off without closing a single wall on a surprise.

That’s the discipline Haven acquired Rowan for. No work proceeds on a change until the change order is signed. The administrative overhead is real, but it’s why our projects finish within a few percent of the number the customer agreed to.

We Also Serve Cities Near North Hollywood

Our crews work across the San Fernando Valley and into the San Gabriel Valley. We regularly quote Home Additions & ADU in North Hollywood and neighboring Burbank, Glendale, Pasadena, and Alhambra. Each city has its own permit jurisdiction and housing stock - Burbank runs through BWP and its own building department, Glendale has distinct hillside grading requirements - so we calibrate every quote to the specific address, not a regional average.

FAQs - Home Additions & ADU in North Hollywood