Home & Room Additions in Los Angeles

When your home no longer fits your lifestyle, a well-planned addition changes the way you live, without the stress of moving. Perfection Builders designs and builds home additions across Los Angeles that blend seamlessly with your existing house and add comfort, function and long-term value.

Whole-home remodel in Studio City · See additions and new homes →

Home Additions We Build

• Room additions and family rooms: more living space on the ground floor
• Primary suites: a bedroom, closet and bathroom built as one private retreat
• Second-story additions: double your space without giving up your yard
• Kitchen and bathroom additions: see Kitchen Additions and Bathroom Additions
• Home offices, bump-outs and garage conversions
• ADUs: see ADU Construction

How Your Addition Comes Together

1. Free in-home consultation. We walk your property, listen to how you want to use the space and talk budget.
2. Design and engineering. Plans that match your home’s architecture, flow and structure.
3. Permits. We handle City of Los Angeles or county permits, zoning and inspections for you.
4. Construction. Licensed, insured crews, a clean job site and clear updates at every stage.
5. Final walkthrough. We finish the details until the addition looks original to the home, not like an afterthought.

Why Homeowners Choose Perfection Builders

• Licensed, bonded and insured general contractor (CSLB #1085229)
• One team from design to final inspection
• Durable materials and proven construction methods
• Respect for your home: clean, organized job sites

Recent additions and exterior work · More projects →

Planning a Home Addition in Los Angeles

How big can my addition be?

In the City of Los Angeles, the Baseline Mansionization Ordinance limits a home’s total floor area based on the lot size and zone, and setbacks control how close you can build to the property lines. Hillside lots have their own limits. We check these at the start, so the design is one the city will approve.

Build out or build up?

A ground-floor addition is usually simpler and keeps everything on one level, but it uses yard space. A second-story addition keeps your yard, but an engineer has to check the existing foundation and framing, and it usually needs more structural work. We walk you through both options on your lot.

What the city reviews

Plans, structural calculations and Title 24 energy compliance. Additions over 500 square feet also pay school district fees, and some lots need a survey or a soils report. We prepare the paperwork and deal with plan check corrections for you.

What Affects the Cost of an Addition

• Size of the addition, and ground floor or second story
• Foundation and structural work
• Whether it includes a kitchen or bathroom (plumbing, gas and ventilation)
• Matching the existing roof, windows, siding and floors
• Design, engineering, permit fees and school fees

You get a written estimate after the free in-home consultation, based on your home and the addition you want.

Areas We Serve

We build additions across Greater Los Angeles, including Sherman Oaks, Encino, Studio City, Valley Village, Woodland Hills, Beverly Hills, Santa Monica, Brentwood, Westwood, Pacific Palisades and the Hollywood Hills.

Home Addition Questions

Do I need a permit for a home addition in Los Angeles?

Yes. Almost every addition needs a building permit, and many need engineering and a zoning review. We prepare and manage the permit process for you.

How long does a home addition take?

It depends on the size of the addition and the permit process. You’ll get a clear timeline with your written estimate after the free in-home consultation.

Can I stay in my home during construction?

In most cases, yes. We plan the work to keep the rest of your home livable and the job site safe and tidy.

Will the addition match my existing house?

Yes. We match rooflines, siding, windows and interior finishes so the new space looks like it was always there.

Should I build an addition or an ADU?

An addition makes your house bigger and becomes part of the main home. An ADU is a separate unit with its own entrance, kitchen and bathroom, which you can use for family or rent out. If you are not sure which fits, we can look at both on your lot. See ADU Construction.

Ready to Add Space?

Book your free in-home consultation or call (323) 212-3020. See our finished work in the Gallery.

Wondering about cost? See our starting prices for addition projects in Los Angeles.