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Top Licensed Home Addition Contractor in Altadena, CA

Room Additions by a top-rated, local licensed general contractor serving Altadena and Los Angeles County. Free estimates, written fixed-price contracts, 24/7 support.

Room Additions in Altadena

Planning a project in Altadena, CA? When your family outgrows the house but you love living in Altadena, an addition is usually smarter than moving. We design and build ground-floor additions, primary suites and second stories that look like they were always part of the home.

Altadena is about 14 miles east of our North Hollywood office, so our Southern California crews are on site quickly for estimates, inspections and the day-to-day work.

What's included

Design and structural engineering
Foundation and framing tied into the existing house
Roof extension matched to existing materials
Plumbing, electrical and HVAC extensions
Windows, doors, insulation and drywall
Interior finishes matched to the rest of the home

Building in Altadena

Many Altadena homes sit on hillside lots or in designated fire hazard severity zones. That can mean geotechnical review, retaining walls, and ignition-resistant materials under the California wildfire building standards. We plan for those requirements from the first site visit.

Altadena is unincorporated, so permits go through Los Angeles County rather than a city building department. Additions need full plan check in Altadena, including structural engineering and energy compliance. We prepare the drawings and manage plan-check corrections for you.

What affects the price

Ground-floor addition versus second story
Square footage and number of new bathrooms
Foundation type and soil conditions
Matching existing roofing, siding and windows
Whether HVAC capacity needs to increase

Every estimate is free, written and itemized. Call 844-975-5512 to schedule a visit.

How we work

Free consultation: We visit your Altadena property, listen to your goals and look at the site.
Design and written estimate: You get a clear scope and an itemized price before anything starts.
Permits and scheduling: We handle plans, permits and the construction schedule.
Build and final walkthrough: Our crew builds, passes inspections and walks you through the finished work.

What our customers say

“We had severe water damage in all of our upstairs bathrooms. The AAA All Star Construction team literally saved us, arriving within the hour to dry the floors and walls.” — Kati, Woodland Hills, CA

Altadena Room Additions FAQ

Can I live in my home during an addition?

In most cases yes. We seal off the work area and schedule disruptive tie-in work so you lose access to as little of the house as possible.

Is a second story or a ground-floor addition better?

A ground-floor addition is usually simpler. A second story keeps your yard but needs more structural work. We walk your Altadena lot and give you both options with prices.

Do you do the design work?

Yes. We are a design-build contractor, so drawings, engineering, permits and construction are handled by one team.

Do you serve all of Altadena?

Yes. We work throughout Altadena and the surrounding Los Angeles County communities from our North Hollywood office. Call 844-975-5512 to schedule a free estimate.

More services in Altadena

Home Addition Contractor near Altadena

AAA All Star Construction Inc. · Licensed California General Contractor CSLB #1018926 · Call 844-975-5512

At AAA All Star Construction Inc, we bring your vision to life with unmatched craftsmanship and dedication. Trust us to transform your space into something extraordinary, where quality meets innovation.