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 Tarzana. Call 310-596-5000 or use the form below.
Additions in Tarzana divide cleanly between flatland parcels north of Ventura Boulevard under the standard BMO and hillside parcels south of Ventura inside the BHO Hillside Area as the topography rises into the Santa Monica Mountains. Upper portions of the hillside area can trigger the Mulholland Scenic Parkway Specific Plan, which is a meaningful additional overlay on any project on the affected slopes. Paradigm Builders has worked LADBS and LA City Planning out of the Van Nuys office on both project types. The hillside addition project pulls a geotechnical study, a grading plan, slope drainage analysis, BHO height and lot coverage review, and where applicable the Mulholland Scenic Parkway Specific Plan review. The flatland addition project runs BMO floor area analysis and proceeds without the hillside overlay. The gated CC&R HOAs in Tarzana including Braemar Country Club, Silverhawk Ridge, Mulholland Park Estates, Tarzana Estates Drive, and Tarzana Woods add HOA architectural review on any addition that changes the visible exterior. The 1970s and 1980s Mediterranean estate, contemporary, and Mid Century Modern inventory south of Ventura dictates an architectural vocabulary that the addition must match. Flatland ranch and traditional north of Ventura allows more design freedom. Paradigm Builders, CSLB license 1100775, runs additions in Tarzana from feasibility through BMO or BHO analysis as appropriate, Mulholland Scenic Parkway coordination where triggered, HOA architectural review, structural engineering, LADBS submittal, framing, and finish.
Room Additions Scope in Tarzana
- 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 Tarzana room addition runs through the same end to end process. Design, permits, and construction under one roof.
We walk your Tarzana 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 LADBS, manage plan check corrections, and coordinate any required HOA design review. Mulholland Scenic Parkway Specific Plan triggers in upper portions of the hillside area.
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 Tarzana
Tarzana additions are shaped by the BHO Hillside Area boundary, the Mulholland Scenic Parkway Specific Plan trigger, the gated HOA architectural review process, and the underlying construction era. Hillside additions south of Ventura pull geotechnical analysis, grading plan, slope drainage, BHO height and lot coverage review, and on upper portions the Mulholland Scenic Parkway Specific Plan review. The Mulholland review is its own meaningful timeline addition. Flatland additions north of Ventura run the standard BMO floor area analysis and proceed without hillside overhead. The gated CC&R HOAs add architectural review on visible exterior elements and material choices. The 1970s and 1980s Mediterranean estate construction era south of Ventura carries original copper supply, original electrical panels, and original gas service that need integration where the addition ties in. The 1950s flatland ranch stock carries galvanized supply and Orangeburg laterals. A full systems integration scope is typical on additions in either zone.
Room Additions Permits in Tarzana
Adding square footage in Tarzana 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 Tarzana are handled by LADBS, LA City Planning, with structural review on every project.
Hillside, coastal, or seismic conditions. South of Ventura Boulevard parcels sit in the BHO Hillside Area, rising into the Santa Monica Mountains. Upper portions may trigger the Mulholland Scenic Parkway Specific Plan. Flatland north of Ventura.
Code specifics. Mulholland Scenic Parkway Specific Plan triggers in upper portions of the hillside area. BHO grading, height, and lot coverage caps. HOA architectural review adds weeks on gated streets.
Historic and design review. Edgar Rice Burroughs Tarzana Ranch and several landmarks. No HPOZ.
Room Additions Cost in Tarzana
Room addition budgets in Tarzana typically begin in the low six figures for a modest single story flatland rear addition north of Ventura with mid grade finish. Larger flatland additions and primary suite expansions generally move into the mid six figures. Hillside additions south of Ventura carry geotechnical, grading, BHO review, and structural cost and typically land in the upper six figures and above. Mulholland Scenic Parkway Specific Plan trigger adds review cost. Gated HOA review adds time and material match cost. A feasibility consultation is the right opening step.
Common Questions: Room Additions in Tarzana
Can I add a second story to my Tarzana 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 Tarzana?
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 Tarzana 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 Tarzana 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 Tarzana and the greater Los Angeles metro area.
