Second-Story Additions in the Hollywood Hills

The Baseline Hillside Ordinance, LAMC 12.21 C.10, applies to R1, RS, RE, and RA parcels that the Department of City Planning maps as Hillside Area. It sets buildable floor area through slope bands, so a steeper lot carries less area than a flat lot of the same size. It caps cumulative grading at 500 cubic yards plus five percent of the lot size, counting cut and fill together. Height on a hillside lot is measured from grade at the perimeter of the required covered parking, which changes the answer on a downslope property.

Street frontage carries its own requirements. A lot fronting a substandard hillside limited street, meaning a roadway narrower than the twenty feet otherwise required, faces dedication and continuous paved width standards before a building or grading permit is issued. Hollywood Hills addresses sit inside the City of Los Angeles, and neighboring hillside blocks can fall under a different city entirely. We confirm the parcel's jurisdiction, its zone, its Hillside Area status, and its street classification before design starts.

A second floor is a new load path running down through the house and into the ground. We evaluate before we commit. Our field team exposes the foundation to confirm type, depth, and reinforcement, checks existing framing for span and species, and documents the shear condition wall by wall. On a hillside that evaluation includes soils and slope, and we bring geotechnical work in early instead of discovering it at plan check.

Older hillside homes in Los Angeles were often built on shallow footings, on caissons of unknown depth, or on a mix of both after decades of additions. Some carry a second floor with new interior shear walls and hold-downs. Some need underpinning, new grade beams, or drilled piers. Some are better served by a different plan entirely, and expanding out or down beats stacking up. We tell you which one you have before you invest in a full design set.

The view is why the second floor exists. Our field team stands the ridge height with story poles before framing so you see the actual sightline from the actual elevation rather than a rendering. Window and door openings are placed against that sightline, and the glazing package is selected to hold the view while meeting Title 24. Large fixed lites, minimal sightline frames, and thermally broken assemblies carry that load. Glass guardrails hold the deck without cutting the horizon.

Orientation decides comfort. A west-facing wall of glass over the basin delivers the sunset and the afternoon heat load together, so we balance it with shading, low solar gain coatings, and a mechanical zone sized for the swing. Privacy runs both directions on a hillside street. We plan glazing, planting, and terrace placement so the new floor does not open your neighbor's bedroom to you or yours to them.

Opening a roof is the highest-risk day on the project, and it gets planned weeks out. We build a temporary weather structure over the work zone before demolition begins, sequence the tear-off so only the covered section is ever open, and dry in each area the same day it is framed. Sheathing, underlayment, and flashing go on before the crew leaves that section.

Interior protection runs underneath the whole operation. Ceilings below the work carry poly and hardboard, contents are moved or wrapped, and we monitor for moisture instead of assuming it stayed out. Roof work is scheduled against the forecast and against the rain season, and we hold the tear-off when the window is wrong and run other scope that week. A day of schedule is worth less than a wet ceiling.

Most of our second-story clients stay in the home. That works when the separations are real. We frame and seal a hard dust barrier at the stair, run negative air on the work side, and give the crew a dedicated entry and restroom so the household routine stays intact. Power and water shutdowns are scheduled with you and kept short.

Noise has a shape, and we map it for you. Framing and roof demolition are loud and finite. We name those weeks in advance and hold posted hours. Floors on the occupied side are covered and swept daily, and the site is left clean every evening. When a stretch of work would make staying genuinely uncomfortable, we give you the dates ahead of time so you can plan around them instead of discovering it on the morning it starts.

Hillside streets are narrow, parking is scarce, and neighbors share every turn. Our crews stage material in small deliveries, park off the street where the site allows it, and schedule boom lift and crane days early with notice to the block. Debris leaves in covered loads. The street stays passable.

We take a limited number of hillside additions at a time so the same field team stays with your house from evaluation through punch list. Your project lead is your single point of contact and reports on a weekly cadence. The firm holds a Class B General Building license and a Class C-33 Painting and Decorating license, with license holder Sebastian Moreno Rivera, and carries full insurance and a one-year workmanship warranty. More than 400 projects completed across Los Angeles. The on-site estimate is free. Call (949) 558-9738 or visit buildanddecorconstruction.com.