How much does a home addition cost in Los Angeles?

First-story additions in LA typically run $400–$700/sqft installed. Second-story additions run $550–$900/sqft — they cost more because of the structural work to the floor below.

Can I add a second story to my LA house?

Usually yes, but the existing foundation and first-story framing have to support the load — we engineer the structural retrofit. Hillside Ordinance and view-protection rules can limit height.

Is Pasadena's permit process faster than LADBS?

Yes. The Pasadena Permit Center typically lands a ministerial ADU at 6–8 weeks, vs. 8–12 in LADBS. Landmark District properties add 4–8 weeks of HPC review.

Does Bungalow Heaven count as a Landmark District?

Yes — Bungalow Heaven, Garfield Heights, Prospect Park, and Madison Heights are all designated. Contributing structures need HPC review for any visible exterior work.

San Gabriel Valley Home Additions.

Adding space to an existing LA house is a different project than building from scratch — you are tying into 1920s framing, surveying the lot for setbacks, and protecting an occupied home through the build. We design additions that match the original house, hold the existing roofline, and pass LADBS structural review the first time.

The SGV is the fastest stretch of LA County we work in. Pasadena, Glendale, and Burbank all run their own building departments with shorter queues than LADBS. The catches are Pasadena's Landmark Districts and the separate municipal utilities — Burbank Water & Power, Glendale Water & Power, Pasadena Water & Power — each with their own connection fees and meter-set timelines.

San Gabriel Valley cost band — 2026

$400 – $700 / sqft (first-story); $550 – $900 / sqft (second-story)

Foundation work, roof tie-in complexity, and how much of the existing house you have to touch drive the band.

San Gabriel Valley permit clock

6–10 weeks ministerial

Plan on 4–6 months for design + LADBS permit, then 5–8 months on-site for a 500–800 sqft addition.

Scope — start to keys.

Setback / FAR / hillside check before contracting
Architectural design that matches the existing house line
Structural tie-in — footings, framing, roof
Full MEP extension and panel upgrade if required
Finishes, exterior siding/stucco match, paint, landscape repair

What changes about the permit here.

Pasadena Permit Center: typically 6–8 weeks for a ministerial ADU.
Pasadena Landmark Districts (Bungalow Heaven, Garfield Heights, etc.) require Historic Preservation review.
Burbank / Glendale / Pasadena run their own water + power utilities — connection fees and timelines differ from LADWP.
Altadena and South Pasadena run through LA County Public Works — slower than the cities by 2–4 weeks.

What moves the San Gabriel Valley number.

Pasadena/Burbank/Glendale plan-check fees track LADBS but utility connections cost more.
Landmark District design review pushes window/door budgets 15–30% higher.
Altadena hillside parcels add geotech similar to LA Hills.
BWP / GWP / PWP service drops can take longer than LADWP — schedule risk, not cost risk.

In short.

How much does a home addition cost in Los Angeles?: First-story additions in LA typically run $400–$700/sqft installed. Second-story additions run $550–$900/sqft — they cost more because of the structural work to the floor below.
Can I add a second story to my LA house?: Usually yes, but the existing foundation and first-story framing have to support the load — we engineer the structural retrofit. Hillside Ordinance and view-protection rules can limit height.
Do I need to move out during a home addition?: Not usually. We sequence and dust-protect so the addition tie-in is the last phase. Most of our LA clients stay in the house the whole project.
Is Pasadena's permit process faster than LADBS?: Yes. The Pasadena Permit Center typically lands a ministerial ADU at 6–8 weeks, vs. 8–12 in LADBS. Landmark District properties add 4–8 weeks of HPC review.
Does Bungalow Heaven count as a Landmark District?: Yes — Bungalow Heaven, Garfield Heights, Prospect Park, and Madison Heights are all designated. Contributing structures need HPC review for any visible exterior work.

More we build in San Gabriel Valley.

Home Additions in nearby LA areas.

Got a San Gabriel Valley project in mind?

Send us the address and we’ll pull San Gabriel Valley zoning, setbacks, and home additions feasibility before you spend on drawings.

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