Quick Answer: Glendale’s R-1-R (Restricted Residential) zone covers much of the city’s hillside terrain in and around the Verdugo Mountains, and it comes with meaningfully different building rules than flatland neighborhoods. Expect a two-story, 32-foot height cap, larger setbacks, floor area tied to lot size and slope, and mandatory grading and slope-stability review for most new construction. Many hillside additions and new homes also go through Glendale’s Design Review process, with larger or more visible projects requiring Design Review Board approval rather than staff-level sign-off. Anyone evaluating a hillside property’s remodel potential should confirm its exact zoning, slope category, and any ridgeline or stream constraints directly with Glendale Community Development before making assumptions.
If you’ve spent any time looking at homes in Glendale’s hillside neighborhoods, you’ve probably noticed the listings read a little differently than homes down in the flats. Lot lines curve with the terrain, driveways climb, and floor plans get creative around slopes. A lot of that comes down to one zoning designation: R-1-R, Glendale’s Restricted Residential (Hillside) zone. If you’re buying in the hills, or eyeing a property because you want room to expand later, understanding what R-1-R actually allows can save you from a very expensive surprise.
What Does R-1-R Zoning Mean in Glendale?
R-1-R stands for Restricted Residential, and it’s Glendale’s primary zoning designation for hillside, low-density residential land. According to the city’s zoning code, the purpose of the R-1-R zone is to preserve and protect low-density residential neighborhoods in hillside areas while protecting open space, natural terrain, and scenic resources. In practice, that means the zone is written to slow down and shape development in terrain that is steeper, more visually prominent, and more sensitive to grading and erosion than a typical flat residential lot.
R-1-R is closely paired in the code with the ROS (Residential Open Space) zone, and many of the hillside-specific rules — ridgeline protection, stream setbacks, and the hillside development review policy — apply to both zones together. If a property you’re considering is zoned ROS rather than R-1-R, assume the restrictions are at least as strict, not less.
Where R-1-R Zoning Typically Applies in Glendale
R-1-R zoning generally follows Glendale’s hillside topography rather than a single tidy neighborhood boundary. You’ll typically find it across the city’s northern and eastern hillside areas, including the foothills of the Verdugo Mountains, Chevy Chase Canyon, and the Whiting Woods area, as well as hillside parcels near Deukmejian Wilderness Park and pockets of higher terrain closer to the La Crescenta border. These are the parts of Glendale where lots sit on meaningful slopes, streets wind rather than run in a grid, and views (and construction costs) tend to go up together.
Because zoning lines don’t always match how people describe neighborhoods, the only reliable way to confirm a specific property’s zoning is to check it directly with Glendale Community Development or the city’s online zoning map before you write an offer, especially if your plans depend on adding square footage or building up.
Key Development Standards in the R-1-R Zone
The R-1-R zone layers several standards on top of each other: lot size and density rules, floor area limits, height limits, setbacks, and open space requirements. Here’s how they generally work.
Lot Size and Density
For new subdivisions, the minimum lot size in the R-1-R zone is 12,000 square feet, considerably larger than the standard flatland residential minimum. There’s a narrower allowance for lot line adjustments involving lots that existed before 1986, which can go as low as 7,500 square feet when no new lots are being created. Density for subdivided hillside land is also tied directly to slope: the steeper the average slope across a parcel, the fewer units per acre the code allows, scaling down from a few units per acre on nearly flat hillside land to well under one unit per acre on the steepest terrain. For most single-family buyers this shows up less as a math problem and more as a reality check — steep hillside land simply doesn’t subdivide or intensify the way flat land can.
Floor Area Limits
Glendale controls how much house you can build relative to lot size through a floor area ratio, or FAR, and the R-1-R zone uses a tiered system across three FAR districts, with allowable floor area running roughly between 0.30 and 0.45 of the lot area for the first 10,000 square feet of the lot, and a much smaller ratio applied to any lot area beyond that. Which FAR district applies to a given hillside lot isn’t something you should guess from a listing — it’s tied to the property’s specific zoning classification, and confirming it is one of the first calls worth making if a remodel or a second story is part of your plan.
Height Limits
Primary residences in the R-1-R zone are generally capped at two stories and 32 feet in height, with an additional three feet allowed when the roof has a qualifying pitch. There’s also an allowance for an added story on lots where the average slope is steep enough — generally in the neighborhood of 40 percent or more — which is one of the more technical calculations in hillside design and typically requires a survey to establish accurately.
Setbacks
Standard setbacks in the R-1-R zone call for roughly 15 feet from the front and street-side property lines and 10 feet along interior side and rear lines. Unlike some hillside ordinances elsewhere, Glendale’s base setback numbers don’t scale automatically with slope percentage — but that doesn’t mean slope is irrelevant. Grading, drainage, and the hillside development review criteria discussed below can all effectively push a buildable envelope in from where the numeric setback alone would suggest.
Open Space, Ridgelines, and Stream Protections
On lots with an average slope over 30 percent, Glendale requires a minimum of 40 percent of the site to remain as open space rather than building footprint or hardscape. Separately, the city’s design standards designate primary and secondary ridgeline areas across the hillsides. Primary ridgelines — the most visually dominant high points against the skyline — are essentially off-limits to grading, structures, and new streets. Secondary ridgelines allow more flexibility but come with tight limits of their own, including reduced building height, capped slope steepness for any manufactured grading, and limits on retaining wall height. Properties near a mapped blue-line stream face their own setback: structures generally need to stay well back from the stream centerline, with an expectation of preserving natural riparian habitat within a wider buffer beyond that. If a hillside lot you’re considering backs up to a canyon, ridge, or drainage course, these overlays are worth investigating early, since they can restrict a building envelope more than the base zoning does on its own.
Grading, Geology, and Soils Requirements
Because hillside soils and slopes behave differently than flat lots, Glendale regulates hillside grading and excavation under its own dedicated chapter of the Municipal Code, separate from standard building permit rules. The stated purpose of that chapter is to safeguard life, health, property, and the environment through minimum standards for grading and excavation on sloped sites, and it applies whether the work is tied to a brand-new home, a major addition, a pool, or significant retaining wall construction.
In practical terms, this usually means that new hillside construction and substantial grading work need a geotechnical or soils engineering report, prepared by a licensed professional, reviewed alongside the standard building plan check. Slope stability, drainage, and the depth and volume of any cut or fill are all part of that review. Glendale’s design review criteria also flag larger-scale grading and steep-slope sites for extra scrutiny — projects involving significant cubic yardage of grading or located on especially steep average slopes are specifically called out as factors reviewing bodies must weigh, with authority to add conditions covering construction methods, grading limits, and tree protection. The exact engineering requirements for any given lot depend on its specific soil type, slope, and grading scope, so this is an area where a general online description is no substitute for a conversation with Glendale’s Building and Safety division and a qualified geotechnical engineer before you count on a specific addition being feasible.
The Review Process for New Hillside Construction
Most new construction, exterior remodeling, and exterior changes requiring a building permit in Glendale are subject to design review, and hillside properties in the R-1-R zone are no exception. What differs is who reviews the project. Smaller additions — generally those under roughly 700 square feet within a two-year period that don’t add a new story or significantly alter a street-facing façade — can often be handled at the staff level by the Director of Community Development. Larger projects don’t get that shortcut: additions of 700 square feet or more, projects that add a story, or those that substantially change a street-facing façade beyond a modest threshold typically require full review and approval from Glendale’s Design Review Board.
On top of the standard design review criteria — compatibility with the neighborhood’s scale, massing, and architectural character — hillside projects are also evaluated against the city’s hillside development review policy. Reviewing bodies are directed to weigh design compatibility with hillside design and landscape guidelines, harmony with the surrounding neighborhood’s size and setbacks, preservation of prominent natural features and native vegetation, the visual impact of building on steep slopes, and architectural fit with the surrounding area. This is a more subjective, judgment-based process than a flatland remodel usually involves, and it’s one reason hillside projects in Glendale often take longer and require more upfront design work than a comparable project on level ground.
What This Means If You’re Buying a Hillside Property
If a hillside home’s remodel or expansion potential is part of why you’re considering it, a little homework before you’re in contract goes a long way. A few things I’d encourage any buyer to check:
- Confirm the exact zoning and FAR district for the specific parcel with Glendale Community Development — don’t assume based on a neighboring property, since hillside zoning and FAR districts can vary lot to lot.
- Ask about slope across the buildable area of the lot, since it affects everything from floor area and height allowances to whether an added story might be possible.
- Check for ridgeline, stream, or open-space overlays that could shrink the usable building envelope well below what the base setbacks suggest.
- Look at the property’s grading and permit history — past unpermitted grading or retaining wall work can complicate future plans and should be flagged during due diligence.
- Budget for geotechnical review as a real cost and timeline item, not an afterthought, if new construction or a significant addition is part of your plan.
- Anticipate Design Review Board involvement for anything beyond a modest addition, and build extra time into your renovation timeline accordingly.
Hillside living in Glendale comes with real rewards — privacy, views, and a sense of space that’s hard to find elsewhere in the San Fernando or Verdugo area — but the zoning that protects those qualities also means hillside properties take more careful evaluation than a standard flatland purchase. Working through the zoning, slope, and review requirements early, rather than after you’re in escrow, is the difference between a hillside home that grows with you and one that quietly limits your options.
Frequently Asked Questions
What does R-1-R zoning mean in Glendale?
R-1-R stands for Restricted Residential, Glendale’s zoning designation for hillside, low-density residential land. It’s designed to preserve hillside neighborhoods, open space, and scenic terrain while allowing single-family homes with more restrictive height, floor area, and grading standards than flatland zones.
Which Glendale neighborhoods are zoned R-1-R?
R-1-R zoning generally follows Glendale’s hillside terrain, including areas around the Verdugo Mountains foothills, Chevy Chase Canyon, Whiting Woods, and hillside parcels near Deukmejian Wilderness Park and the city’s higher-elevation areas toward La Crescenta. Because boundaries follow topography rather than neighborhood names, always confirm a specific parcel’s zoning with the city.
How tall can a house be in Glendale’s R-1-R zone?
Primary residences in the R-1-R zone are generally limited to two stories and 32 feet in height, with a small additional allowance for pitched roofs. An extra story may be permitted on lots with especially steep average slope, subject to city confirmation.
What is the maximum floor area allowed on an R-1-R lot?
Floor area is calculated as a ratio of house size to lot size and varies by the property’s assigned FAR district, generally ranging from about 0.30 to 0.45 for the first 10,000 square feet of lot area, with a much lower ratio applied beyond that. The exact figure depends on the lot’s specific zoning classification.
Do hillside additions in Glendale need Design Review Board approval?
It depends on size and scope. Smaller additions that don’t add a story or significantly change a street-facing façade can often be approved at the staff level, while larger additions, new stories, or substantial façade changes typically require full Design Review Board review.
Does a hillside property in Glendale require a geology or soils report?
Many new hillside homes and significant grading projects do require a geotechnical or soils report as part of Glendale’s hillside grading regulations, reviewed by the city’s Building and Safety division. The exact requirement depends on the scope of grading and the property’s soil and slope conditions.
Are there special setback rules for steep-slope lots in Glendale?
The R-1-R zone’s base setbacks are generally around 15 feet from front and street-side lines and 10 feet along interior lines regardless of slope, but ridgeline protections, stream buffers, and hillside design review can further restrict where a home can actually be built.
What is a ridgeline protection area, and does it affect hillside lots?
Glendale designates primary and secondary ridgelines in its hillside areas. Primary ridgelines are largely protected from grading and construction, while secondary ridgelines allow limited development under tighter height, slope, and retaining wall restrictions. A lot near a mapped ridgeline can have a smaller usable building envelope than its zoning alone would suggest.
How many homes can be built on a large hillside lot in Glendale?
Density on R-1-R land is tied to average slope, with allowable density per acre decreasing as slope steepens. On most single-family hillside lots this simply reinforces one home per lot, but it matters more for larger parcels being considered for subdivision.
What should I check before buying a hillside home in Glendale for remodel potential?
Confirm the exact zoning and FAR district, understand the lot’s slope, check for ridgeline or stream overlays, review any past grading or permit history, and budget time and cost for geotechnical review and possible Design Review Board approval before assuming a specific addition or remodel is feasible.
This article summarizes general provisions of the City of Glendale’s zoning and municipal code as they relate to R-1-R hillside development and is not legal, engineering, or zoning advice; always verify current standards, FAR district assignments, and grading requirements for a specific property with Glendale Community Development before relying on them.
About Will Flannigan
Will Flannigan is a California licensed real estate agent (DRE #01951292) and Certified Trust & Probate Specialist (CTPS) with The Nell Team at Equity Union Real Estate. A former attorney, Will brings a background in property management and over a dozen home flips to every transaction, and has been licensed since 2014. A 20+ year resident of Burbank Rancho, Will specializes in Burbank, Altadena, Pasadena, Glendale, and the greater San Gabriel Valley, with fluency in Mandarin serving clients in San Marino and beyond.
Evaluating a hillside property in Glendale’s R-1-R zone? Let’s talk through its development potential before you make an offer.
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