Expand Without Moving
ADU & Room Additions in Tarzana
Permitted ADUs, garage conversions, master-suite and second-story additions across the Los Angeles area.
ADUs, master-suite additions and second-story builds in Tarzana and the LA area. Both ADUs and traditional room additions are smart ways to add space — to accommodate a growing family, host extended relatives, generate rental income, or simply gain the square footage you need without moving.
We design and permit ADUs (Accessory Dwelling Units), garage conversions, master suites, second-story additions and bump-outs across Tarzana, Encino, Woodland Hills, Sherman Oaks and the wider Los Angeles area. Every addition is fully permitted, structurally engineered, and finished to match the existing home so the new space feels like it has always been there.
One in-house team handles design, permits, structural, MEP rough-ins, framing, finishes and inspections — see our six-step process.
ADU & Room Addition FAQs
What homeowners ask before adding square footage in Tarzana and LA.
What's the difference between an ADU and a room addition?
An ADU (Accessory Dwelling Unit) is a permitted, self-contained living unit with its own kitchen, bath and entry — used for family, rental income, or a home office. A room addition expands the existing home (master suite, second story, bump-out). We build both.
How long does an ADU take in Los Angeles?
Most detached ADUs run 5–8 months from permit-ready to final inspection. Attached and garage-conversion ADUs can be faster (3–6 months). Site conditions and city plan-check times are the biggest variables.
What does an ADU cost in Tarzana?
Our ADUs typically run $75,000–$400,000 depending on square footage, finish level, foundation type and whether it's a garage conversion or new construction. We give a written line-item estimate after the design phase.
Do I need an architect?
For most ADUs and additions we cover the design in-house and bring in a licensed architect / structural engineer where the city plan-check requires stamped drawings. Either way it's coordinated through us.
Can a second-story addition work on my existing foundation?
Sometimes — it depends on the original construction, soils report and seismic requirements. We commission the structural evaluation first so you know whether the existing foundation works, needs retrofit, or requires a different approach.
Related work
See our addition portfolio, our whole-home remodel service, or windows & doors.
Ready to start your project?
Tell us about it — no obligation, no pressure. We respond within one business day.