New Construction & Additions
Second-Story Additions in Monterey Park, CA
Add a full upper floor to a one-story house with engineered foundations, new shear walls and a stair that fits the existing plan, all permitted through the City of Monterey Park.
- Licensed California general contractor
- Plans, engineering & permits handled
- Written, line-item estimates
- One team from design to final inspection
Second-Story Additions
Build Up and Keep Your Yard
Second-story additions in Monterey Park add a floor of bedrooms without giving up the backyard, which matters when setbacks leave little room to build outward. The R-1 zone allows two stories and 30 feet, so a one-story ranch house or bungalow has room to grow upward if its structure can carry the load.
That condition defines the project. A house built as a single story was framed and founded for one roof, and a new floor above it changes both the gravity loads and the earthquake forces the building has to resist. We start with a structural evaluation, then handle design, engineering, permits and construction under one contract, so the upper floor and the reinforcement below it are planned together.
What's Included
What a Second-Story Addition Involves
Structural evaluation
An engineer reviews existing footings, framing and connections to determine what can carry the new floor as is and what must be reinforced first.
Foundation retrofit
New or enlarged footings, pad footings under new posts, and anchor bolts and hold-downs tied into the existing foundation wherever the engineer calls for them.
Shear walls and seismic hardware
Plywood shear walls, hold-downs and straps on both floors so the taller building resists the lateral forces of an earthquake or strong wind.
Stair placement
A code-compliant stair takes real floor area downstairs. We place it where it disturbs the existing plan least and lands well upstairs.
Roof removal and weather protection
The existing roof comes off in planned sections, and the open structure is covered and protected against rain while the new floor is framed.
Upper-floor systems
HVAC zoning, plumbing for upstairs bathrooms, an electrical service upgrade if needed, and Title 24 energy compliance for the added living space.
Is It Right for You?
Is Your Home a Candidate for a Second Story?
The yard is too small to build out
When setbacks and floor area leave little room on the ground, going up adds space on the footprint you already have and keeps the yard intact.
The foundation is in fair shape
Footings without major settlement or cracking can often be reinforced rather than replaced, which keeps a second story practical for your house.
You want separation or views
An upper floor creates a quiet sleeping level apart from the living areas, and on sloped streets it can open up views the ground floor never had.
You can plan around a move-out
The roof comes off during framing, so plan to live elsewhere for part of the project and set aside time and money for temporary housing.
Our Process
How a Second-Story Addition Comes Together
Structural feasibility
Before design, an engineer evaluates the foundation and framing. You learn early whether the house needs modest reinforcement or major foundation work, and can decide with real information.
Design and engineering
The architect designs the upper floor, stair and exterior massing, while the engineer prepares calculations for gravity loads, shear walls, hold-downs and footings in parallel with the drawings.
Design review and plan check
A second floor often takes a home past 2,000 square feet, which brings Monterey Park design review before Building and Safety plan check. We manage both reviews and all corrections.
Ground-floor reinforcement
New footings, hold-downs and shear walls go in on the ground floor first, and each is inspected by the city before any upper-floor framing begins.
Roof removal and upper framing
The roof is removed in planned sections, the new floor system and walls are framed, and the new roof is dried in as quickly as the sequence allows.
Systems, finishes and final
Stair finishes, systems, insulation, drywall and interior finishes are completed on both floors, and the city performs its final inspection before your household moves back in.
Options Compared
Second-Story Approaches Compared
An upper floor can cover the whole house or only part of it, and each approach changes the engineering, cost and disruption.
| Option | Best For | What to Know |
|---|---|---|
| Full second story | Adding several bedrooms on a lot with little yard | Heaviest foundation and shear wall work; roof removal over the whole house usually means moving out. |
| Partial second story | A primary suite over one wing of the house | Less structural work and a smaller roof opening; massing must stay proportional to the house below. |
| Second story over the garage | Attached garages with sound slabs and walls | Garage footings often need upgrading, and fire separation is required between parking and rooms above. |
| Tear-down and new two-story home | Houses needing major foundation and systems work anyway | Worth pricing when retrofit costs climb; new-home requirements such as solar and sprinklers then apply. |
Budget Planning
What Drives Second-Story Cost
Second-story budgets are shaped more by what happens beneath the new floor than by the rooms themselves. Foundation work, shear walls and roof removal are real costs, and we price each as its own line so nothing hides inside an allowance.
Foundation upgrades
The engineer's findings on existing footings decide whether you need a few new pad footings or continuous new foundation work around the house.
Shear wall scope
New plywood walls and hold-downs on the ground floor mean opening finished walls in rooms you already use, then patching and repainting them.
Stair location
Fitting the stair can mean relocating a wall, closet or bathroom downstairs, adding demolition and rebuilding in finished rooms downstairs.
Temporary housing
Rent while the roof is off is a household cost rather than a construction line, but it belongs in your overall budget from the start.
Local Knowledge
Second Stories on Monterey Park Homes
Height is rarely the obstacle in Monterey Park because the single-family zone permits two stories up to 30 feet. Floor area is the tighter limit: the upper level counts toward the same lot-based cap as the ground floor, so a house on a lot under 6,000 square feet tops out at half its lot size in total floor area. An earlier city Housing Element found about two-thirds of local homes were built before 1970, long before today's seismic detailing, so our engineer evaluates first. On sloped lots in the Garvey and Monterey Hills, expect the engineer to ask for soils information as well.
Why Choose Us
Why Homeowners Choose Simply Construction for Second-Story Additions
Structural evaluation before design fees
We bring in a structural engineer to assess your foundation and framing before you commit to full architectural drawings. That order protects your budget: if the house needs major foundation work, you learn it while you can still compare a partial second story or a rebuild. Plans follow the 2025 edition of the California Residential Code, which Monterey Park adopted with local amendments.
Real dates for the months you are out
We sequence roof removal, framing and dry-in as one tight stretch and give you a written timeline for the period the house is uninhabitable, so you can arrange temporary housing with real dates. Payment milestones track completed work, as Business and Professions Code 7159.5 requires after the down payment, so you never pay ahead of the progress you can see on the structure.
One accountable, licensed builder
A second story ties structure, systems and code compliance together, and it needs a licensed California general contractor responsible for all of them. The CSLB website shows our license status, bond and workers' comp coverage for you to check. Our office is in Monterey Park, close to your job site for inspections and meetings, and every job runs on a written, line-item scope.
Service Area
Second-Story Additions Across Los Angeles & Ventura Counties
Our second-story additions work extends well beyond Monterey Park. Choose your city for local permitting notes, housing details and planning considerations.
San Fernando Valley
Second-Story Additions in Burbank
Second-Story Additions in Studio City
Second-Story Additions in Sherman Oaks
Second-Story Additions in Encino
Second-Story Additions in Woodland Hills
Second-Story Additions in Toluca Lake
Second-Story Additions in Valley Village
Second-Story Additions in Tarzana
Second-Story Additions in Reseda
Second-Story Additions in Northridge
Second-Story Additions in Porter Ranch
Second-Story Additions in Granada Hills
Second-Story Additions in Chatsworth
Second-Story Additions in West Hills
Glendale, Pasadena & Northeast LA
Westside, Hollywood & the Coast
Second-Story Additions in Santa Monica
Second-Story Additions in Beverly Hills
Second-Story Additions in Pacific Palisades
Second-Story Additions in Malibu
Second-Story Additions in Brentwood
Second-Story Additions in Bel Air
Second-Story Additions in Westwood
Second-Story Additions in West Hollywood
Second-Story Additions in Hollywood Hills
Second-Story Additions in Marina del Rey
Second-Story Additions in Oakwood
Second-Story Additions in Manhattan Beach
Santa Clarita, Conejo & Las Virgenes
Related Services
Often Paired With Second-Story Additions
New Construction & Additions
Room Additions
Ground-floor bedroom, primary suite and family room additions tied cleanly into your existing structure.
Explore Room AdditionsRemodeling & More
Whole-House Remodeling
Full-home renovations that update layout, systems and finishes in one coordinated project.
Explore Whole-House RemodelsNew Construction & Additions
Custom Home Building
Ground-up custom homes and tear-down rebuilds, managed from plans and permits to final inspection.
Explore Custom HomesWant to know who you would be working with? Read about Simply Construction, see our project gallery, or contact our Monterey Park office.
FAQ
Second-Story Additions Questions, Answered
Can my one-story Monterey Park house support a second floor?
Some houses need only modest reinforcement, and others need extensive foundation work. A structural engineer's evaluation of the footings, framing and soil is the only reliable answer for your house. Monterey Park's R-1 zone permits two stories, so zoning height is seldom the barrier; the existing structure is the open question.
Do we have to move out during construction?
Plan on it for part of the project. Once the roof comes off, the house is exposed to weather and construction traffic, and utilities are interrupted during tie-in. We give you a written timeline for that phase so you can line up housing. Some partial second stories let families stay in unaffected rooms.
Where does the staircase go?
The stair needs floor space and headroom on both levels, and the building code sets rules for riser height, tread depth, width and handrails. We look for a location, often in a hallway, dining area or former bedroom, that connects well to both floors without cutting through the main living space.
Will I need new shear walls?
Very likely. Adding a story increases the lateral forces an earthquake puts on the ground floor, and walls framed for a one-story house were not designed for that load. The engineer specifies where plywood sheathing, hold-downs and anchor bolts go, and the city inspects them before the walls are closed.
Does a second story require design review?
It does if the finished home reaches 2,000 square feet or more, which many second-story projects do. Design review considers architectural quality, style and compatibility with the neighborhood, so the upper floor's massing, rooflines and materials need to relate to the house below and the street.
Start Your Project
Ready to Plan Your Second-Story Additions Project?
Share a few details and we will set up a site visit, review your goals and give you a written, line-item estimate.
Licensed California General Contractor · CSLB [CSLB LICENSE # PLACEHOLDER]