Single story, second story, and primary suite additions built to code and designed for the way your home actually flows.
Get a free in home consultation in Alhambra. Call 310-596-5000 or use the form below.
Adding a bedroom, a family room, or a second story to an Alhambra home is a structural and zoning exercise before it is an architectural one. Most of the city sits on relatively flat terrain south of the foothills, which means horizontal expansion is often the first option, but lot dimensions in older tracts like Bean Tract and Emery Park are narrow and side yard setbacks under Alhambra Municipal Code Title 20 leave a tight envelope. Paradigm Builders has built room additions on Alhambra parcels where the original 1920s Craftsman bungalow is set forward on the lot with a deep rear yard and a single car driveway down one side. The work begins with the City of Alhambra Community Development Department at 111 South First Street under Title 20, with intake through the Building Division at 626 570 5032. Spanish Colonial Revival, Tudor Revival, Mid Century, and post war ranch homes each carry their own set of constraints when an addition has to read from the street as part of the original design rather than a tacked on box. The Historic Preservation Ordinance adopted in 2025 created a framework for landmark and district designation, which influences how an addition to a registered property is shaped, particularly along visible elevations. Paradigm Builders, license 1100775, designs additions that respect the existing massing, roof line, and material vocabulary. The office is at 1800 Century Park East Suite 600, Los Angeles, California 90067. Direct line is 310 596 5000.
Room Additions Scope in Alhambra
- Single story rear additions (great rooms, primary suites, kitchen expansions)
- Second story additions over existing footprint
- Pop up and pop out additions (small footprint expansions for kitchens or baths)
- Sunroom and four season room additions
- Garage conversion to living space (separate from detached ADU work)
- Bump outs for primary closets and bathrooms
- Structural engineering, foundation underpinning, and load path corrections
- Roof tie ins, ridge alignment, and exterior style matching
Our Room Additions Process
Every Alhambra room addition runs through the same end to end process. Design, permits, and construction under one roof.
We walk your Alhambra property to assess existing structural conditions, lot coverage, setback constraints, and zoning. Some lots will not support a second story. Some need foundation work first. We tell you up front what is buildable.
Floor plans, elevations, 3D renderings, and full structural engineering. We coordinate with surveyors, soils engineers, and the design team to deliver a permit ready package.
Line by line proposal covering site work, foundation, framing, exterior, MEP, finishes, and inspection fees. Allowances are real.
We submit the addition package to City of Alhambra Community Development Dept, manage plan check corrections, and coordinate any required HOA design review. ADUs may not be prohibited on landmarked or registered properties, but they must conform to the ADU regulations and the Historic Preservation Ordinance.
Excavation, footings, foundation pour, and any required structural retrofit on the existing house. Inspected before framing begins.
Wood or steel framing per engineering, roof tie ins, sheathing, dry in. The most visible week of any addition project.
Plumbing, HVAC, electrical rough through framing. Insulation. Pre drywall inspection.
Drywall, paint, flooring, doors, trim, fixtures. Final inspection and certificate of occupancy where applicable.
What a Room Addition Project Looks Like in Alhambra
Room additions in Alhambra are uniquely shaped by lot geometry, the age of the receiving structure, and the new Historic Preservation Ordinance. A narrow 50 foot wide bungalow lot with a single side yard easement constrains how an addition can extend laterally. A second story on a 1920s Craftsman or Spanish Colonial requires structural review of the original foundation, framing, and load path, which on many older Alhambra homes means significant retrofit before any new framing goes up. Properties on a local, state, or national register cannot be split under SB 9, and exterior changes including additions visible from the public right of way may trigger additional design review under the Historic Preservation Ordinance. Where the house has knob and tube wiring or galvanized supply, the addition often forces an upgrade of the primary panel and supply main as part of the load calculation. Paradigm Builders sequences the addition design, structural engineering, Title 20 review, and historic considerations as a single coordinated package so the project does not stall at plan check.
Room Additions Permits in Alhambra
Adding square footage in Alhambra is a structural project. Permits, plan check, hillside or coastal review where applicable, and HOA approval where applicable.
Where the permits go. Addition plan checks in Alhambra are handled by City of Alhambra Community Development Dept, 111 S First St, with structural review on every project.
Hillside, coastal, or seismic conditions. Mostly flat, near Raymond Hill fault zone south of the city.
Code specifics. ADUs may not be prohibited on landmarked or registered properties, but they must conform to the ADU regulations and the Historic Preservation Ordinance. No additional parking required if the parcel is on a register.
Historic and design review. Historic Preservation Ordinance adopted in 2025 establishing landmark and district designation framework. Properties on a local, state, or national register are ineligible for SB 9 splits.
Room Additions Cost in Alhambra
Room addition pricing in Alhambra typically starts in the low six figures for a modest single story extension on a slab and runs higher for second story work or for additions that require foundation retrofit on an older bungalow. Per square foot ranges depend on whether the addition is conditioned space with full mechanical, electrical, and plumbing or whether it is a simpler enclosed room with limited finishes. Historic Preservation Ordinance review on a landmarked Bean Tract or Emery Park property can extend the design phase and add cost. Paradigm Builders prices each scope after walking the lot, reviewing the existing structural drawings if available, and confirming setback and FAR compliance under Title 20.
Common Questions: Room Additions in Alhambra
Can I add a second story to my Alhambra home?
Often yes, but it depends on existing foundation, zoning height limits, lot coverage, and whether your area sits in a hillside or historic overlay. We do a feasibility walk before any design work to tell you what is buildable.
How long does a room addition take in Alhambra?
Single story additions typically run 5 to 8 months total from design start to final inspection. Second story projects run 7 to 12 months. Hillside lots with grading or foundation retrofit add time.
Will I need to move out during the addition?
Depends on which part of the house is touched. Pure rear additions that are sealed off until tie in usually allow you to stay. Second story additions touching the roof typically require a short relocation during the most invasive weeks.
Do you handle structural engineering?
Yes. We coordinate the structural engineer of record, soils report if required, and any retrofit calculations. Engineering is part of the design package, not a separate scope you have to chase.
Can I match the existing exterior style?
Yes. We work with stucco, wood siding, brick veneer, stone veneer, and most LA area exterior systems. Color matching, texture matching, and aging existing stucco to blend with new is part of the finish trade.
What is the minimum addition size you take on?
We do bump out work as small as 80 to 120 square feet (closet, bathroom, kitchen pop out) up to whole house additions. The design and permit overhead is similar across sizes, so smaller projects pay a higher per square foot rate.
Nearby Cities We Serve
Paradigm Builders works throughout the greater Los Angeles area. Room Additions pages for nearby cities:
Ready to Add Square Footage to Your Alhambra Home?
Send your addition details below. We walk the lot, run a feasibility opinion, and follow up with a design proposal and budget range tailored to your Alhambra property.
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Or call 310-596-5000
Paradigm Builders
1800 Century Park East Suite 600
Los Angeles, CA 90067
Phone: 310-596-5000
Email: info@paradigmbuilders.com
California Contractors State License Board: License 1100775
Serving Alhambra and the greater Los Angeles metro area.
